CN107025680A - A kind of map rendering intent and device - Google Patents

Abstract

The present application provides a map rendering method and device, by obtaining the map rendering mode and map rendering parameters; obtaining the current position of the terminal device; and obtaining map data corresponding to the map rendering mode according to the map rendering parameters and the current position of the terminal device; Then, the obtained map data is rendered according to the map rendering mode, so as to ensure that the map rendering result is rendered according to the map rendering mode required by the user, so as to narrow the gap between the user's sense of substitution of the map rendering result and the user's actual driving experience .

Description

A map rendering method and device

technical field

The present invention relates to the technical field of geographic information, and more specifically, to a map rendering method and device.

Background technique

With the popularity of smart terminals, map products play an increasingly important role in people's lives. In order to bring users a more realistic and direct map rendering effect, more and more map products begin to adopt 3D map rendering technology.

Existing 3D map rendering technologies can render a 3D map in a bird's-eye view mode, and FIG. 1 is a map rendering effect diagram of a 3-D map in a bird's-eye view mode. Wherein, the arrow 11 in FIG. 1 indicates the current location of the smart terminal. It can be seen from the rendering effect in Figure 1 that there is a certain gap between the user's sense of substitution of the rendering result and the user's actual driving experience in the 3D map in bird's-eye view mode.

Therefore, it is an urgent problem to be solved to provide a map rendering method and device to narrow the gap between the user's sense of substitution of the map rendering result and the user's actual driving experience.

Contents of the invention

In view of this, the present invention provides a map rendering method and device to narrow the gap between the user's sense of substitution of the map rendering result and the user's actual driving experience.

In order to achieve the above object, the technical solutions provided by the embodiments of the present invention are as follows:

A map rendering method, comprising:

Get the map rendering mode and map rendering parameters;

Obtain the current location of the terminal device;

Acquiring map data corresponding to the map rendering mode according to the map rendering parameters and the current location of the terminal device;

Rendering the acquired map data according to the map rendering mode.

Preferably, the acquiring map rendering mode specifically includes:

receiving a map rendering request, the map rendering request carrying a map rendering mode;

or,

Read the preset map rendering mode.

Preferably, the map rendering parameters include at least map scale, resolution and pixel density of the terminal device screen, and the map corresponding to the map rendering mode is obtained according to the map rendering parameters and the current location of the terminal device Specifically, the data includes:

According to the map scale, the resolution and the pixel density of the screen of the terminal device, the geographical parameters of the map displayed on the screen of the terminal device are obtained;

Map data corresponding to the map rendering mode is acquired according to the geographic parameters of the map and the current location of the terminal device.

Preferably, according to the map scale, the resolution and pixel density of the screen of the terminal device, acquiring the geographical parameters of the map displayed on the screen of the terminal device specifically includes:

Using the map scale and the pixel density of the terminal device screen to obtain a scale coefficient;

According to the resolution of the screen of the terminal device and the scale factor, the geographic parameters of the map displayed on the screen of the terminal device are obtained.

Preferably, the map rendering mode is a three-dimensional map rendering mode of a first-person perspective, and the geographical parameters of the map displayed on the terminal device screen obtained according to the resolution of the terminal device screen and the scale coefficient specifically include:

According to the horizontal pixel value in the resolution of the screen of the terminal device and the scale factor, the horizontal geographical length of the map displayed on the screen of the terminal device is obtained;

The preset vertical geographic length of the map displayed on the screen of the terminal device is acquired, and the horizontal geographic length and the vertical geographic length are geographic parameters of the map displayed on the screen of the terminal device.

Preferably, the current location of the terminal device includes longitude coordinates and latitude coordinates, and according to the geographical parameters of the map and the current location of the terminal device, acquiring map data corresponding to the map rendering mode specifically includes:

Obtaining the minimum longitude coordinate and the maximum longitude coordinate in the horizontal direction of the map displayed by the terminal device according to the longitude coordinate in the current position of the terminal device and the horizontal geographic length of the map;

determining the latitude coordinates in the current position of the terminal device as the minimum latitude coordinates in the vertical direction of the map displayed by the terminal device;

Translating the minimum latitude coordinate by the vertical geographical length to obtain the maximum latitude coordinate in the vertical direction of the map displayed by the terminal device;

Map data whose geographic coordinate positions fall within the geographic range formed by the maximum longitude coordinate, maximum latitude coordinate, minimum longitude coordinate, and minimum latitude coordinate are acquired.

Preferably, rendering the acquired map data according to the map rendering mode specifically includes:

Transform the map data from the latitude and longitude coordinate system into the map data of the inertial coordinate system in the map rendering mode according to the scale coefficient, the viewing angle corresponding to the map rendering mode, and the map rotation angle, and the coordinate origin of the inertial coordinate system is the current location of the terminal device;

Taking any coordinate of the camera space coordinate system as the new coordinate origin of the inertial coordinate system, translating the map data in the inertial coordinate system to the camera space coordinate system to obtain the map data in the camera space coordinate system;

Projecting the map data in the camera space coordinate system to the coordinate plane representing the camera screen in the camera space coordinate system to obtain the map data in the two-dimensional screen coordinate system;

The map data in the two-dimensional screen coordinate system is rendered through a rasterization process.

Preferably, the transformation of the map data from the longitude-latitude coordinate system into the map data of the inertial coordinate system in the map rendering mode according to the scale coefficient, the viewing angle corresponding to the map rendering mode, and the map rotation angle specifically includes:

Using the preset coordinate transformation matrix M1 to transform the map data from the latitude _- longitude coordinate system into the map data of the inertial coordinate system in the map rendering mode;

Wherein, said M ₁ =M _t *S ₁ *R ₁ ;

Wherein, the 3*3 matrix in the upper left corner of the matrix is an identity matrix; (-x ₀ , -y ₀ , -z ₀ ) are translation coordinates, indicating the current position of the terminal device, and x ₀ represents the horizontal direction The translation component, y ₀ represents the translation component in the vertical direction, and z ₀ represents the translation component in the vertical direction;

Wherein, the 3*3 matrix in the upper left corner of the matrix is a scaling matrix, which represents the magnification factor of each axis in the three-dimensional space, and S _x1 is the scale coefficient of the map scale in the horizontal direction; S _y1 is the scale coefficient of the map scale in the vertical direction. The scale coefficient of direction; _Sz1 is the scale coefficient of described map scale in vertical direction;

Wherein, the 3*3 matrix in the upper left corner of the matrix represents the rotation matrix, (rx _x1 , rx _y1 , rx _z1 ) represents the viewing angle, (ry _x1 , ry _y1 , ry _z1 ) represents the rotation angle of the map, ( rz _x1 , rz _y1 , rz _z1 ) represent the ground rotation angle.

Preferably, any coordinate of the camera space coordinate system is used as the new coordinate origin of the inertial coordinate system, and the map data in the inertial coordinate system is translated to the camera space coordinate system to obtain a map in the camera space coordinate system Specifically, the data includes:

Using the preset translation coordinate system M to translate the map data under the inertial coordinate system to the camera space coordinate system, obtain the map data under the camera space coordinate system _;

Among them, the The 3*3 matrix in the upper left corner of the matrix is the identity matrix; (x _p0 , y _p0 , z _p0 ) is any coordinate of the camera space coordinate system, x _p0 represents the translation component in the horizontal direction, and y _p0 represents The translation component in the vertical direction, z _p0 represents the translation component in the vertical direction.

A map rendering device, comprising:

A mode parameter acquisition unit, configured to acquire a map rendering mode and map rendering parameters;

a location acquisition unit, configured to acquire the current location of the terminal device;

a map data acquiring unit, configured to acquire map data corresponding to the map rendering mode according to the map rendering parameters and the current location of the terminal device;

A map rendering unit, configured to render the acquired map data according to the map rendering mode.

Preferably, the map rendering parameters include at least map scale, resolution and pixel density of the terminal device screen, and the map data acquisition unit includes:

A geographic parameter acquisition unit, configured to acquire geographic parameters of the map displayed on the terminal device screen according to the map scale, the resolution and pixel density of the terminal device screen;

The map data acquisition subunit is configured to acquire map data corresponding to the map rendering mode according to the geographic parameters of the map and the current location of the terminal device.

Preferably, the geographic parameter acquisition unit includes:

a scale coefficient calculation unit, configured to use the map scale and the pixel density of the terminal device screen to obtain a scale coefficient;

The geographic parameter acquisition subunit is configured to obtain the geographic parameters of the map displayed on the screen of the terminal device according to the resolution of the screen of the terminal device and the scale factor.

Preferably, the map rendering mode is a three-dimensional map rendering mode of a first-person perspective, and the geographic parameter acquisition subunit includes:

A horizontal geographical length calculation unit, configured to obtain the horizontal geographical length of the map displayed on the terminal device screen according to the horizontal pixel value in the resolution of the terminal device screen and the scale factor;

The geographic parameter determination unit is configured to obtain a preset vertical geographic length of the map displayed on the screen of the terminal device, and the horizontal geographic length and the vertical geographic length are geographical parameters of the map displayed on the screen of the terminal device.

Preferably, the current location of the terminal device includes longitude coordinates and latitude coordinates, and the map data acquisition subunit includes:

A calculation unit, configured to obtain the minimum longitude coordinate and the maximum longitude coordinate in the horizontal direction of the map displayed by the terminal device according to the longitude coordinates in the current location of the terminal device and the horizontal geographic length of the map;

a determining unit, configured to determine the latitude coordinates in the current position of the terminal device as the minimum latitude coordinates in the vertical direction of the map displayed by the terminal device;

a translation unit, configured to translate the minimum latitude coordinate by the vertical geographic length to obtain the maximum latitude coordinate in the vertical direction of the map displayed by the terminal device;

An acquiring unit, configured to acquire map data whose geographic coordinates fall within the geographic range formed by the maximum longitude coordinate, maximum latitude coordinate, minimum longitude coordinate, and minimum latitude coordinate.

Preferably, the map rendering unit includes:

A coordinate system transformation unit, configured to transform the map data from the longitude-latitude coordinate system into the map data of the inertial coordinate system in the map rendering mode according to the scale coefficient, the viewing angle corresponding to the map rendering mode, and the map rotation angle, so that The coordinate origin of the inertial coordinate system is the current position of the terminal device;

The coordinate system translation unit is used to take any coordinate of the camera space coordinate system as the new coordinate origin of the inertial coordinate system, and translate the map data in the inertial coordinate system to the camera space coordinate system to obtain the coordinate system in the camera space coordinate system. map data;

A projection unit, configured to project the map data in the camera space coordinate system to the coordinate plane representing the camera screen in the camera space coordinate system, to obtain the map data in the two-dimensional screen coordinate system;

The raster unit is used to render the map data in the two-dimensional screen coordinate system through a rasterization process.

The present application provides a map rendering method and device, by obtaining the map rendering mode and map rendering parameters; obtaining the current position of the terminal device; and obtaining map data corresponding to the map rendering mode according to the map rendering parameters and the current position of the terminal device; Then, the obtained map data is rendered according to the map rendering mode, so as to ensure that the map rendering result is rendered according to the map rendering mode required by the user, so as to narrow the gap between the user's sense of substitution of the map rendering result and the user's actual driving experience .

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

FIG. 1 is a map rendering effect diagram of a three-dimensional map in a bird's-eye view mode provided by an embodiment of the present application;

FIG. 2 is a flow chart of a map rendering method provided by an embodiment of the present application;

FIG. 3 is a flowchart of a method for acquiring map data corresponding to a map rendering mode according to map rendering parameters and a current location of a terminal device provided by an embodiment of the present application;

FIG. 4 is a flow chart of a method for obtaining geographic parameters of a map displayed on a terminal device screen according to the map scale, the resolution and pixel density of the terminal device screen provided by an embodiment of the present application;

FIG. 5 is a flow chart of a method for obtaining geographical parameters of a map displayed on a terminal device screen according to the resolution and scale coefficient of the terminal device screen provided by an embodiment of the present application;

FIG. 6 is a flow chart of a method for acquiring map data corresponding to a map rendering mode according to geographical parameters of a map and a current location of a terminal device provided by an embodiment of the present application;

FIG. 7 is a schematic diagram of coordinates for obtaining map data corresponding to a map rendering mode according to geographic parameters of a map and a current location of a terminal device provided by an embodiment of the present application;

FIG. 8 is a flow chart of a method for rendering acquired map data according to a map rendering mode provided by an embodiment of the present application;

FIG. 9 is a map rendering effect diagram of a three-dimensional map in first-person perspective mode provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a map rendering device provided by an embodiment of the present application;

FIG. 11 is a schematic diagram of a detailed structure of a map data acquisition unit provided by an embodiment of the present application;

FIG. 12 is a schematic diagram of a detailed structure of a geographic parameter acquisition unit provided in an embodiment of the present application;

FIG. 13 is a schematic diagram of a detailed structure of a geographic parameter acquisition subunit provided in an embodiment of the present application;

FIG. 14 is a schematic diagram of a detailed structure of a map data acquisition subunit provided in an embodiment of the present application;

FIG. 15 is a schematic diagram of a detailed structure of a map rendering unit provided by an embodiment of the present application.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

FIG. 2 is a flow chart of a map rendering method provided by an embodiment of the present application.

As shown in Figure 2, the method includes:

S201. Obtain a map rendering mode and map rendering parameters;

In practical applications, the methods for obtaining the map rendering mode include:

Receive a map rendering request, which carries a map rendering mode; or, read a preset map rendering mode. Usually, electronic map software can provide users with multiple map rendering modes to choose from, such as 2D perspective mode and 3D perspective mode. The 3D perspective mode can specifically be a bird's-eye view mode or a first-person perspective mode. The map rendering request carried The map rendering mode or the preset map rendering mode is one selected by the user from various map rendering modes provided by the electronic map software, such as the first-person perspective mode.

The specific application scenario for obtaining the above map rendering mode may be that when the electronic map software is started, the preset map rendering mode is read; during the process of using the electronic map software, if the user switches the map rendering mode, the map rendering request is received. The switched map rendering mode is carried in the map rendering request. For example, in the process of using the electronic map software, the user switches the map rendering mode from the bird's-eye view mode to the first-person perspective mode, and the map rendering request is received, and the map rendering mode carried in the map rendering request is the first-person perspective mode.

The above examples are only to illustrate the embodiments of the present application more clearly. Those skilled in the art can choose the method of obtaining the map rendering mode and the specific application scenarios of the corresponding methods according to the product requirements. The above examples should not be regarded as limitations on the implementation of the present invention. .

S202. Obtain the current location of the terminal device;

In practical applications, the terminal devices are mobile phones, tablet computers, and the like.

The above example is only to illustrate the embodiment of the application more clearly. Those skilled in the art can choose the form of expression of the terminal device for the specific application of the map rendering method provided by the embodiment of the application according to the product requirements. The above examples should not be regarded as Limitations on Embodiments of the Invention.

S203. Acquire map data corresponding to the map rendering mode according to the map rendering parameters and the current location of the terminal device;

In the embodiment of the present application, preferably, according to the map rendering parameters and the current location of the terminal device, the acquired map data corresponding to the map rendering mode is the map data to be rendered.

S204. Render the acquired map data according to the map rendering mode.

In the embodiment of the present application, preferably, after acquiring the map data corresponding to the map rendering mode, the acquired map data needs to be rendered according to the map rendering mode to obtain a map rendering result, which is the terminal The electronic map displayed on the device screen.

In order to more clearly describe a map rendering method provided by the embodiment of the present application, the map rendering method corresponding to the map rendering mode is acquired according to the map rendering parameters and the current location of the terminal device in the map rendering method provided by the embodiment of the present application. The process of map data is described in detail.

Fig. 3 is a flow chart of a method for obtaining map data corresponding to the map rendering mode according to the map rendering parameters and the current position of the terminal device provided by the embodiment of the present application. In this embodiment, the map rendering parameters include map scale, terminal device The resolution of the device screen and/or the pixel density of the terminal device screen, the method includes:

S301. According to the map scale, the resolution and the pixel density of the screen of the terminal device, obtain the geographic parameters of the map displayed on the screen of the terminal device;

S302. Acquire map data corresponding to the map rendering mode according to the geographic parameters of the map and the current location of the terminal device.

The method for obtaining map data corresponding to the map rendering mode shown in FIG. 3 is only a preferred embodiment provided by this application. Any deformation based on the above method, such as increasing the types of map rendering parameters or reducing the types of map rendering parameters etc., it should be considered that the technical solution disclosed in this application has given corresponding technical inspiration.

The process of obtaining geographical parameters of the map displayed on the screen of the terminal device according to the map scale, resolution and pixel density of the screen of the terminal device in a map rendering method provided by the embodiment of the present application is now described in detail.

FIG. 4 is a flow chart of a method for acquiring geographic parameters of a map displayed on a terminal device screen according to the map scale, the resolution and pixel density of the terminal device screen provided by an embodiment of the present application.

As shown in Figure 4, the method includes:

S401. Obtain a scale coefficient by using the map scale and the pixel density of the screen of the terminal device;

In the embodiment of the present application, preferably, the reciprocal of the map scale is divided by the pixel density of the terminal device screen to obtain the scale coefficient of the terminal device screen, that is, the reciprocal of the map scale is used as the divisor, and the pixel density of the terminal device screen is The density is used as the dividend, and the division operation is performed to obtain the scale factor of the terminal device screen.

Take the map scale as 1:1KM and the pixel density of the terminal device screen as 25d/cm as an example for illustration. Among them, the map scale is 1:1KM, which means that the length of 1cm (centimeter) of the display screen is equal to the actual 1KM, that is, the actual distance of 1 kilometer, and the pixel density of the terminal device screen is 25d/cm, which means that 1cm on the display screen is equal to 25d( pixel), then, the actual distance that can be displayed per pixel of the display screen is 1000m/25d=40m/d (meter/pixel), that is, the scale factor is 40. Therefore, in the embodiment of the present application, a scale factor of 40 means that each pixel of the screen of the terminal device corresponds to a solid distance of 40 m.

S402. According to the resolution and the scale factor of the screen of the terminal device, the geographic parameters of the map displayed on the screen of the terminal device are obtained.

In the embodiment of the present application, preferably, when the map rendering mode is a three-dimensional map rendering mode of the first-person perspective, in the embodiment of the present application, preferably, the scale coefficient includes three components, which are the vertical component, the vertical The component of the direction, the component of the horizontal direction, and the magnitude of these three components are the same. For a method of obtaining geographical parameters of a map displayed on a terminal device screen according to the resolution and scale coefficient of the terminal device screen provided by the embodiment of the present application, please refer to FIG. 5. As shown in FIG. 5, the method includes:

S501. Obtain the horizontal geographical length of the map displayed on the screen of the terminal device according to the horizontal pixel value and the scale factor in the resolution of the screen of the terminal device;

In the embodiment of the present application, preferably, the resolution of the screen of the terminal device includes the horizontal pixel value of the screen of the terminal device.

The above is only the preferred mode of the embodiment of the present application. The inventor can arbitrarily set the content included in the resolution of the terminal device screen according to his own needs. For example, the resolution of the terminal device screen includes the horizontal pixel value and vertical pixel value of the terminal device screen. The pixel value is not limited here.

In the embodiment of the present application, preferably, when the resolution of the screen of the terminal device includes a horizontal pixel value, the horizontal geographic length of the map displayed on the screen of the terminal device can be obtained by using the horizontal pixel value and the scale factor.

In the embodiment of the present application, preferably, according to the horizontal pixel value and the scale coefficient in the resolution of the screen of the terminal device, the process of obtaining the horizontal geographical length of the map displayed on the screen of the terminal device includes: using the horizontal pixel value in the resolution of the screen of the terminal device The horizontal pixel value is multiplied by the scale factor, and the product result is used as the horizontal geographical length of the map displayed on the terminal device screen.

In the embodiment of the present application, preferably, the process of multiplying the horizontal pixel value in the resolution of the screen of the terminal device by the scale coefficient, and using the product result as the horizontal geographical length of the map displayed on the screen of the terminal device includes: obtaining the scale coefficient in the horizontal For the horizontal component value of the direction component, the obtained horizontal component value is multiplied by the horizontal pixel value in the resolution of the terminal device screen, and the product result is used as the horizontal geographical length of the map displayed on the terminal device screen.

S502. Obtain a preset vertical geographical length of the map displayed on the screen of the terminal device, where the horizontal geographical length and the vertical geographical length are geographical parameters of the map displayed on the screen of the terminal device.

In the embodiment of the present application, preferably, the vertical geographic length of the map displayed on the screen of the terminal device is preset. In the process of obtaining the geographical parameters of the map displayed on the terminal device screen according to the resolution and scale coefficient of the terminal device screen, after calculating the horizontal geographical length of the map displayed on the terminal device screen, the preset terminal The vertical geographical length of the map displayed on the screen of the device, and then the calculated horizontal geographical length and the obtained vertical geographical length are used as geographical parameters of the map displayed on the screen of the terminal device.

In the embodiment of the present application, preferably, the inventor can arbitrarily set the specific value of the preset vertical geographic length according to his own needs, which is not limited here.

Further, in order to more clearly explain a map rendering method provided by the embodiment of the present application, the map rendering method according to the geographic parameters of the map and the current location of the terminal device in the map rendering method provided by the embodiment of the present application is now described. The process of rendering the map data corresponding to the mode is described in detail.

Fig. 6 is a flow chart of a method for obtaining map data corresponding to the map rendering mode according to the geographical parameters of the map and the current location of the terminal device provided by the embodiment of the present application. Fig. 7 is a flow chart of a method according to the map The geographic parameters of the terminal device and the current location of the terminal device are used to obtain the coordinate schematic diagram of the map data corresponding to the map rendering mode. In this embodiment, the current location of the terminal device includes longitude coordinates and latitude coordinates. It can be seen from FIG. 6 and FIG. 7 that the method includes:

S601. According to the longitude coordinates in the current position of the terminal device and the horizontal geographical length of the map, obtain the minimum longitude coordinate and the maximum longitude coordinate in the horizontal direction of the map displayed by the terminal device;

In the embodiment of the present application, preferably, when the current location of the terminal device includes the longitude coordinates and latitude coordinates of the current location of the terminal device, the embodiment of the present application provides a geographical parameter based on the map and the current location of the terminal device, The method for obtaining the map data corresponding to the map rendering mode first needs to obtain the minimum longitude coordinate and the maximum longitude coordinate in the horizontal direction of the map displayed by the terminal device according to the longitude coordinate in the current position of the terminal device and the horizontal geographic length of the map.

Referring to Fig. 7, wherein, 71 represents the current position of the terminal device, 72 represents the screen space of the terminal device, the parallelogram in 73 represents the geographical parameters of the map, and one side L of the parallelogram represents the preset vertical geographical position of the map displayed on the screen of the terminal device Length, the other side W of the parallelogram represents the horizontal geographical length of the map displayed on the screen of the terminal device.

It can be seen from FIG. 7 that in the embodiment of the present application, preferably, according to the longitude coordinates in the current position of the terminal device and the horizontal geographic length of the map, the minimum longitude coordinates and the maximum longitude coordinates of the map displayed by the terminal device in the horizontal direction are obtained. The method includes: taking the longitude coordinate of the terminal device as the center point of the side length W, translating the longitude coordinate of the terminal device along the X-axis direction by a horizontal geographical length of W/2, and obtaining the maximum longitude coordinate of the map displayed by the terminal device in the horizontal direction; The longitude coordinate of the terminal device is taken as the center point of the side length W, and the longitude coordinate of the terminal device is translated along the X-axis in the opposite direction by the horizontal geographical length of W/2 to obtain the minimum longitude coordinate of the map displayed by the terminal device in the horizontal direction.

S602. Determine the latitude coordinates in the current position of the terminal device as the minimum latitude coordinates in the vertical direction of the map displayed by the terminal device;

S603. Translate the minimum latitude coordinate to the vertical geographic length to obtain the maximum latitude coordinate in the vertical direction of the map displayed by the terminal device;

It can be seen from FIG. 7 that the specific implementation process of steps S602 and S603 includes: determining the latitude coordinates in the current position of the terminal device as the minimum latitude coordinates in the vertical direction of the map displayed by the terminal device, and setting the latitude coordinates in the current position of the terminal device The coordinates are translated along the Z-axis direction by the horizontal geographical length of L to obtain the maximum latitude coordinates in the vertical direction of the map displayed on the terminal device.

S604. Acquire the map data whose geographic coordinates fall within the geographic range formed by the maximum longitude coordinate, maximum latitude coordinate, minimum longitude coordinate, and minimum latitude coordinate.

In the embodiment of the present application, preferably, the map data whose geographical coordinate position falls within the geographical range formed by the maximum longitude coordinate, maximum latitude coordinate, minimum longitude coordinate and minimum latitude coordinate is obtained, and the obtained map data is obtained according to The geographic parameters of the map and the current location of the terminal device, and the acquired map data corresponding to the map rendering mode.

Further, in order to explain the map rendering method provided in the embodiment of the present application more clearly, the process of rendering the acquired map data according to the map rendering mode in the map rendering method provided in the embodiment of the present application is now carried out Details.

FIG. 8 is a flowchart of a method for rendering acquired map data according to a map rendering mode provided by an embodiment of the present application.

As shown in Figure 8, the method includes:

S801. Transform the map data from the latitude-longitude coordinate system into the map data of the inertial coordinate system in the map rendering mode according to the scale coefficient, the viewing angle corresponding to the map rendering mode, and the map rotation angle. The coordinate origin of the inertial coordinate system is the current position of the terminal device. ;

In the embodiment of the present application, preferably, the viewing angle corresponding to the map rendering mode is preset by the map rendering mode, which indicates the angle between the line of sight and the horizontal plane, that is, the pitch angle.

The above is only the preferred method of the embodiment of the present application. The inventor can set the viewing angle setting method arbitrarily according to his own needs, such as setting the viewing angle corresponding to the current user's line of sight in real time as the viewing angle in the embodiment of the application, etc., which is not limited here. .

In the embodiment of the present application, preferably, the map rotation angle is calculated in real time, which indicates the angle between the current line of sight and the vertical plane.

The above is only the preferred way of the embodiment of the present application. The inventor can set the way of setting the map rotation angle arbitrarily according to his own needs, such as setting the map rotation angle to a preset value, etc., which is not limited here.

S802. Taking any coordinate of the camera space coordinate system as the new coordinate origin of the inertial coordinate system, translating the map data in the inertial coordinate system to the camera space coordinate system, and obtaining the map data in the camera space coordinate system;

In the embodiment of this application, preferably, any coordinate of the camera space coordinate system is usually the coordinate origin of the camera space coordinate system, and this coordinate origin generally indicates that the origin is the center of the bottom of the camera lens (screen) in the camera space, such as coordinates point (0, 0, 0).

The above is only the preferred mode of the embodiment of the present application, and the inventor can arbitrarily set the specific coordinates as the new coordinate origin according to his own needs, which is not limited here.

S803. Project the map data in the camera space coordinate system to the camera space coordinate system representing the coordinate plane of the camera screen, and obtain the map data in the two-dimensional screen coordinate system;

S804. Render the map data in the two-dimensional screen coordinate system through a rasterization process.

Further, in order to more clearly explain a map rendering method provided by the embodiment of the present application, the map data is converted from the longitude and latitude to The process of transforming the coordinate system into the map data of the inertial coordinate system in the map rendering mode is described in detail.

In the embodiment of the present application, preferably, the map data is transformed from the longitude _- latitude coordinate system into the map data of the inertial coordinate system in the map rendering mode by using the preset coordinate transformation matrix M1;

Among them, M ₁ =M _t *S ₁ *R ₁ ;

Among them, the 3*3 matrix in the upper left corner of the matrix is the identity matrix; (-x ₀ , -y ₀ , -z ₀ ) is the translation coordinate, indicating the current position of the terminal device, x ₀ represents the translation component in the horizontal direction, and y ₀ represents the translation component in the vertical direction, z ₀ represents the translation component in the vertical direction;

Among them, the 3*3 matrix in the upper left corner of the matrix is a scaling matrix, which represents the magnification factor of each axis in the three-dimensional space, S _x1 is the scale coefficient of the map scale in the horizontal direction; S _y1 is the scale coefficient of the map scale in the vertical direction; S _z1 is the scale coefficient of the map scale in the vertical direction;

Among them, the 3*3 matrix in the upper left corner of the matrix represents the rotation matrix, (rx _x1 , rx _y1 , rx _z1 ) represents the viewing angle, (ry _x1 , ry _y1 , ry _z1 ) represents the map rotation angle, (rz _x1 , rz _y1 , rz _z1 ) represents the ground rotation angle.

In the embodiment of the present application, preferably, (rz _x1 , rz _y1 , rz _z1 ) is usually equal to (0, 0, 0,) to indicate that the ground does not rotate.

The above are only the preferred modes of the embodiment of the present application, and the inventors can set the specific values of (rz _x1 , rz _y1 , rz _z1 ) arbitrarily according to their own needs, which are not limited here.

Further, in order to explain a map rendering method provided by the embodiment of the present application more clearly, the method provided by the embodiment of the present application uses any coordinate of the camera space coordinate system as the new coordinate origin of the inertial coordinate system, and the inertial The map data in the coordinate system is translated to the camera space coordinate system, and the process of obtaining the map data in the camera space coordinate system is introduced in detail.

In the embodiment of the present application, preferably, the map data in the inertial coordinate system is translated to the camera space coordinate system by using the preset translation coordinate system M ₀ to obtain the map data in the camera space coordinate system;

in, The 3*3 matrix in the upper left corner of the matrix is the identity matrix; (x _p0 , y _p0 , z _p0 ) is any coordinate of the camera space coordinate system, x _p0 represents the translation component in the horizontal direction, and y _p0 represents the translation in the vertical direction Component, z _p0 represents the translation component in the vertical direction.

In the embodiment of this application, preferably, any coordinate of the camera space coordinate system is usually the coordinate origin of the camera space coordinate system, and this coordinate origin generally indicates that the origin is the center of the bottom of the camera lens (screen) in the camera space, such as coordinates point (0, 0, 0).

In the embodiment of the present application, preferably, when any coordinate of the camera space coordinate system is the coordinate origin (0, 0, 0) of the camera space coordinate system,

Further, in order to explain a map rendering method provided by the embodiment of the present application more clearly, the method of projecting the map data in the camera space coordinate system to the camera space coordinate system to represent the coordinates of the camera screen provided by the embodiment of the present application is now On the surface, the process of obtaining the map data in the two-dimensional screen coordinate system is introduced in detail.

In the embodiment of the present application, preferably, the map data in the camera space coordinate system is projected to the coordinate plane representing the camera screen in the camera space coordinate system by using the preset perspective projection matrix projection to obtain the map data in the two-dimensional screen coordinate system ,in,

Among them, -1 in the last line of the perspective projection matrix projection represents the normalized coefficient of the odd space coordinate system.

Specifically, the perspective projection matrix projection is a prior art. For the description of the perspective projection matrix projection, please refer to the prior art, and details are not repeated here.

Referring to Fig. 1 and Fig. 9, wherein, Fig. 1 is a map rendering effect diagram of a bird's-eye view mode three-dimensional map provided by the embodiment of the present application (the arrow 11 in Fig. 1 indicates the current position of the smart terminal); Fig. 9 is the implementation of the present application The example provides a map rendering effect diagram of a three-dimensional map in first-person perspective mode (the arrow 91 indicates the current location of the smart terminal).

From Figure 1 and Figure 9, it can be clearly seen that when the map rendering mode provided by the embodiment of the present application is a three-dimensional map rendering mode of the first-person perspective, the user's sense of substitution and the user's actual driving experience of the rendering results The gap between is significantly smaller than the gap between the user's sense of substitution of the rendering result and the user's actual driving experience when the map rendering mode is a bird's-eye view 3D map rendering mode.

The present application provides a map rendering method, by obtaining the map rendering mode and map rendering parameters; obtaining the current position of the terminal device; and according to the map rendering parameters and the current position of the terminal device, obtaining map data corresponding to the map rendering mode; and then The obtained map data is rendered in accordance with the map rendering mode to ensure that the map rendering result is rendered in accordance with the map rendering mode required by the user, so as to narrow the gap between the user's sense of substitution of the map rendering result and the user's actual driving experience.

FIG. 10 is a schematic structural diagram of a map rendering device provided by an embodiment of the present application.

As shown in Figure 10, the device includes:

A mode parameter acquisition unit 101, configured to acquire a map rendering mode and map rendering parameters;

A location acquisition unit 102, configured to acquire the current location of the terminal device;

The map data acquiring unit 103 is configured to acquire map data corresponding to the map rendering mode according to the map rendering parameters and the current location of the terminal device;

The map rendering unit 104 is configured to render the acquired map data according to a map rendering mode.

In this embodiment of the present application, preferably, the mode parameter acquiring unit 101 receives a map rendering request, and the map rendering request carries a map rendering mode; or, reads a preset map rendering mode.

FIG. 11 is a schematic diagram of a detailed structure of a map data acquisition unit provided by an embodiment of the present application.

In the embodiment of the present application, preferably, the map rendering parameters include at least map scale, resolution and pixel density of the screen of the terminal device. As shown in Figure 11, the map data acquisition unit includes:

The geographic parameter acquisition unit 111 is used to acquire the geographic parameters of the map displayed on the screen of the terminal device according to the map scale, the resolution and the pixel density of the screen of the terminal device;

The map data acquisition subunit 112 is configured to acquire map data corresponding to the map rendering mode according to the geographic parameters of the map and the current location of the terminal device.

FIG. 12 is a schematic diagram of a detailed structure of a geographic parameter acquisition unit provided in an embodiment of the present application.

As shown in Figure 12, the geographic parameter acquisition unit includes:

The scale coefficient calculation unit 121 is used to obtain the scale coefficient by using the map scale and the pixel density of the terminal device screen;

The geographic parameter acquisition subunit 122 is configured to obtain the geographic parameters of the map displayed on the screen of the terminal device according to the resolution and scale factor of the screen of the terminal device.

FIG. 13 is a schematic diagram of a detailed structure of a geographic parameter acquisition subunit provided by an embodiment of the present application.

In the embodiment of the present application, preferably, the map rendering mode is a three-dimensional map rendering mode of a first-person perspective. As shown in Figure 13, the geographic parameter acquisition subunit includes:

The horizontal geographical length calculation unit 131 is used to obtain the horizontal geographical length of the map displayed on the terminal device screen according to the horizontal pixel value and the scale factor in the resolution of the terminal device screen;

The geographic parameter determination unit 132 is configured to obtain a preset vertical geographic length of the map displayed on the screen of the terminal device, and the horizontal geographic length and the vertical geographic length are geographical parameters of the map displayed on the screen of the terminal device.

FIG. 14 is a schematic diagram of a detailed structure of a map data acquisition subunit provided by an embodiment of the present application.

In this embodiment of the present application, preferably, the current location of the terminal device includes longitude coordinates and latitude coordinates. As shown in Figure 14, the map data acquisition subunit includes:

The calculation unit 141 is configured to obtain the minimum longitude coordinate and the maximum longitude coordinate in the horizontal direction of the map displayed by the terminal device according to the longitude coordinate in the current position of the terminal device and the horizontal geographic length of the map;

A determining unit 142, configured to determine the latitude coordinates in the current position of the terminal device as the minimum latitude coordinates in the vertical direction of the map displayed by the terminal device;

The translation unit 143 is used to translate the vertical geographical length of the minimum latitude coordinate to obtain the maximum latitude coordinate in the vertical direction of the map displayed by the terminal device;

The obtaining unit 144 is configured to obtain map data whose geographical coordinates fall within a geographical range formed by the maximum longitude coordinate, the maximum latitude coordinate, the minimum longitude coordinate, and the minimum latitude coordinate.

FIG. 15 is a schematic diagram of a detailed structure of a map rendering unit provided by an embodiment of the present application.

As shown in Figure 15, the map rendering unit includes:

The coordinate system transformation unit 151 is used to transform the map data from the longitude and latitude coordinate system into the map data of the inertial coordinate system in the map rendering mode according to the scale coefficient and the corresponding viewing angle and map rotation angle of the map rendering mode, and the coordinate origin of the inertial coordinate system is the current location of the terminal device;

The coordinate system translation unit 152 is used to take any coordinate of the camera space coordinate system as the new coordinate origin of the inertial coordinate system, translate the map data in the inertial coordinate system to the camera space coordinate system, and obtain the map data in the camera space coordinate system ;

The projection unit 153 is used to project the map data in the camera space coordinate system to the coordinate plane representing the camera screen in the camera space coordinate system to obtain the map data in the two-dimensional screen coordinate system;

The raster unit 154 is configured to render map data in a two-dimensional screen coordinate system through a rasterization process.

The present application provides a map rendering device, by obtaining the map rendering mode and map rendering parameters; obtaining the current position of the terminal device; and according to the map rendering parameters and the current position of the terminal device, obtaining map data corresponding to the map rendering mode; and then The obtained map data is rendered in accordance with the map rendering mode to ensure that the map rendering result is rendered in accordance with the map rendering mode required by the user, so as to narrow the gap between the user's sense of substitution of the map rendering result and the user's actual driving experience.

It should be noted that each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. For the same and similar parts in each embodiment, refer to each other, that is, Can. As for the device-type embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for related parts, please refer to part of the description of the method embodiments.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements of or also include elements inherent in such a process, method, article, or device. Without further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

The above is a detailed introduction to a three-dimensional navigation map rendering method and device provided by the present invention. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the present invention. method and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. limits.

Claims (15)

1. A map rendering method, comprising:

obtaining a map rendering mode and map rendering parameters;

acquiring the current position of the terminal equipment;

obtaining map data corresponding to the map rendering mode according to the map rendering parameters and the current position of the terminal equipment;

rendering the acquired map data according to the map rendering mode.

2. The method according to claim 1, wherein the obtaining a map rendering mode specifically comprises:

receiving a map rendering request, wherein the map rendering request carries a map rendering mode;

or,

and reading a preset map rendering mode.

3. The method according to claim 1, wherein the map rendering parameters include at least a map scale, a resolution of a terminal device screen, and a pixel density, and the obtaining the map data corresponding to the map rendering mode according to the map rendering parameters and the current location of the terminal device specifically includes:

acquiring geographic parameters of the map displayed on the screen of the terminal equipment according to the map scale, the resolution and the pixel density of the screen of the terminal equipment;

and acquiring map data corresponding to the map rendering mode according to the geographic parameters of the map and the current position of the terminal equipment.

4. The method according to claim 3, wherein the obtaining of the geographic parameter of the map displayed on the terminal device screen according to the map scale, the resolution of the terminal device screen, and the pixel density specifically comprises:

obtaining a scale coefficient by utilizing the map scale and the pixel density of the terminal equipment screen;

and obtaining the geographic parameters of the map displayed on the screen of the terminal equipment according to the resolution of the screen of the terminal equipment and the scale coefficient.

5. The method according to claim 4, wherein the map rendering mode is a three-dimensional map rendering mode of a first-person perspective, and the obtaining of the geographic parameter of the map displayed on the terminal device screen according to the resolution of the terminal device screen and the scale factor specifically comprises:

obtaining the horizontal geographic length of a map displayed by the screen of the terminal equipment according to the horizontal pixel value in the resolution of the screen of the terminal equipment and the scale factor;

and acquiring the preset vertical geographic length of the map displayed on the screen of the terminal equipment, wherein the horizontal geographic length and the vertical geographic length are geographic parameters of the map displayed on the screen of the terminal equipment.

6. The method according to claim 5, wherein the current location of the terminal device includes longitude and latitude coordinates, and the obtaining the map data corresponding to the map rendering mode according to the geographic parameter of the map and the current location of the terminal device specifically includes:

obtaining a minimum longitude coordinate and a maximum longitude coordinate of a map displayed by the terminal equipment in the horizontal direction according to the longitude coordinate in the current position of the terminal equipment and the horizontal geographic length of the map;

determining a latitude coordinate in the current position of the terminal equipment as a minimum latitude coordinate of a map displayed by the terminal equipment in a vertical direction;

translating the minimum latitude coordinate by the vertical geographic length to obtain a maximum latitude coordinate of a map displayed by the terminal equipment in the vertical direction;

and acquiring map data of which the geographic coordinate position falls within a geographic range formed by the maximum longitude coordinate, the maximum latitude coordinate, the minimum longitude coordinate and the minimum latitude coordinate.

7. The method according to claim 5 or 6, wherein the rendering the acquired map data according to the map rendering mode specifically includes:

according to a scale coefficient, a visual angle corresponding to the map rendering mode and a map rotation angle, transforming the map data from a longitude and latitude coordinate system into map data of an inertial coordinate system in the map rendering mode, wherein the origin of coordinates of the inertial coordinate system is the current position of the terminal equipment;

taking any coordinate of a camera space coordinate system as a new coordinate origin of the inertial coordinate system, translating the map data under the inertial coordinate system to the camera space coordinate system, and obtaining the map data under the camera space coordinate system;

projecting the map data under the camera space coordinate system to a coordinate plane of a camera screen represented by the camera space coordinate system to obtain the map data under a two-dimensional screen coordinate system;

and rendering the map data under the two-dimensional screen coordinate system through a rasterization process.

8. The method according to claim 7, wherein the transforming the map data from the longitude and latitude coordinate system to the map data of the inertial coordinate system in the map rendering mode according to the scale factor and the view angle and the map rotation angle corresponding to the map rendering mode specifically comprises:

using a predetermined coordinate transformation matrix M₁Transforming the map data from a latitude and longitude coordinate system to map data of an inertial coordinate system in the map rendering mode;

wherein, M is₁＝M_t*S₁*R₁；

000000 wherein the matrix of 3 x 3 in the upper left corner of the matrix is an identity matrix; (-x)₀，-y₀，-z₀) Is a translation coordinate indicating the current position, x, of the terminal device₀Representing a translation component in the horizontal direction, y₀Representing a translation component in the vertical direction, z₀Represents a translation component in the vertical direction;

x1y1z1, wherein the upper left 3 x 3 matrix is a scaling matrix representing the magnification factor of each axis in three-dimensional space, S_x1The scale factor of the map scale in the horizontal direction is obtained; s_y1The scale factor of the map scale in the vertical direction is obtained; s_z1The scale factor of the map scale in the vertical direction is obtained;

x1y1z1x1y1z1x1y1z1 wherein the upper left-hand 3 x 3 matrix of said matrices represents a rotation matrix, (rx 1x 1z 1)_x1,rx_y1,rx_z1) Represents the viewing angle, (ry)_x1,ry_y1,ry_z1) Represents the map rotation angle, (rz)_x1,rz_y1,rz_z1) Representing the ground angle.

9. The method according to claim 8, wherein translating the map data in the inertial coordinate system to the camera space coordinate system with any one coordinate of the camera space coordinate system as a new origin of coordinates of the inertial coordinate system, and obtaining the map data in the camera space coordinate system specifically includes:

using a preset translational coordinate system M₀Translating the map data under the inertial coordinate system to a camera space coordinate system to obtain the map data under the camera space coordinate system;

wherein, thep0p0p0p0p0 the upper left 3 x 3 matrix of the matrices is the identity matrix; (x)_p0，y_p0，z_p0) Is any one of the coordinates, x, of the spatial coordinate system of the camera_p0Representing a translation component in the horizontal direction, y_p0Representing a translation component in the vertical direction, z_p0Representing a translation component in the vertical direction.

10. A map rendering apparatus, comprising:

a mode parameter acquiring unit for acquiring a map rendering mode and a map rendering parameter;

a position acquisition unit for acquiring a current position of the terminal device;

the map data acquisition unit is used for acquiring map data corresponding to the map rendering mode according to the map rendering parameters and the current position of the terminal equipment;

and the map rendering unit is used for rendering the acquired map data according to the map rendering mode.

11. The apparatus of claim 10, wherein the map rendering parameters include at least a map scale, a resolution of a terminal device screen, and a pixel density, and the map data obtaining unit includes:

the geographic parameter acquisition unit is used for acquiring geographic parameters of the map displayed on the screen of the terminal equipment according to the map scale, the resolution and the pixel density of the screen of the terminal equipment;

and the map data acquisition subunit is used for acquiring the map data corresponding to the map rendering mode according to the geographic parameters of the map and the current position of the terminal equipment.

12. The apparatus of claim 11, wherein the geographic parameter obtaining unit comprises:

the scale factor calculation unit is used for obtaining a scale factor by utilizing the map scale and the pixel density of the terminal equipment screen;

and the geographic parameter acquisition subunit is used for acquiring the geographic parameter of the map displayed by the screen of the terminal equipment according to the resolution of the screen of the terminal equipment and the scale coefficient.

13. The apparatus of claim 12, wherein the map rendering mode is a three-dimensional map rendering mode from a first-person perspective, and wherein the geographic parameter obtaining subunit comprises:

the horizontal geographic length calculating unit is used for obtaining the horizontal geographic length of the map displayed by the screen of the terminal equipment according to the horizontal pixel value in the resolution of the screen of the terminal equipment and the scale factor;

and the geographic parameter determining unit is used for acquiring the preset vertical geographic length of the map displayed on the screen of the terminal equipment, and the horizontal geographic length and the vertical geographic length are geographic parameters of the map displayed on the screen of the terminal equipment.

14. The apparatus of claim 13, wherein the current location of the terminal device comprises longitude and latitude coordinates, and wherein the map data obtaining subunit comprises:

the computing unit is used for obtaining the minimum longitude coordinate and the maximum longitude coordinate of the map displayed by the terminal equipment in the horizontal direction according to the longitude coordinate in the current position of the terminal equipment and the horizontal geographic length of the map;

a determining unit, configured to determine a latitude coordinate in a current position of the terminal device as a minimum latitude coordinate in a vertical direction of a map displayed by the terminal device;

the translation unit is used for translating the minimum latitude coordinate by the vertical geographic length to obtain a maximum latitude coordinate of a map displayed by the terminal equipment in the vertical direction;

and the acquisition unit is used for acquiring the map data of which the geographic coordinate position falls in a geographic range formed by the maximum longitude coordinate, the maximum latitude coordinate, the minimum longitude coordinate and the minimum latitude coordinate.

15. The apparatus of claim 14, wherein the map rendering unit comprises:

a coordinate system transformation unit, configured to transform the map data from a longitude and latitude coordinate system to map data of an inertial coordinate system in the map rendering mode according to a scale coefficient, a view angle corresponding to the map rendering mode, and a map rotation angle, where an origin of coordinates of the inertial coordinate system is a current position of the terminal device;

the coordinate system translation unit is used for taking any coordinate of a camera space coordinate system as a new coordinate origin of the inertial coordinate system, translating the map data under the inertial coordinate system to the camera space coordinate system and obtaining the map data under the camera space coordinate system;

the projection unit is used for projecting the map data under the camera space coordinate system to a coordinate plane of a camera screen represented by the camera space coordinate system to obtain the map data under a two-dimensional screen coordinate system;

and the grating unit is used for rendering the map data under the two-dimensional screen coordinate system through a rasterization process.