1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
|
/*
* tkWinRegion.c --
*
* Tk Region emulation code.
*
* Copyright (c) 1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tkWinRegion.c,v 1.2 1998/09/14 18:24:01 stanton Exp $
*/
#include "tkWinInt.h"
/*
*----------------------------------------------------------------------
*
* TkCreateRegion --
*
* Construct an empty region.
*
* Results:
* Returns a new region handle.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
TkRegion
TkCreateRegion()
{
RECT rect;
memset(&rect, 0, sizeof(RECT));
return (TkRegion) CreateRectRgnIndirect(&rect);
}
/*
*----------------------------------------------------------------------
*
* TkDestroyRegion --
*
* Destroy the specified region.
*
* Results:
* None.
*
* Side effects:
* Frees the storage associated with the specified region.
*
*----------------------------------------------------------------------
*/
void
TkDestroyRegion(r)
TkRegion r;
{
DeleteObject((HRGN) r);
}
/*
*----------------------------------------------------------------------
*
* TkClipBox --
*
* Computes the bounding box of a region.
*
* Results:
* Sets rect_return to the bounding box of the region.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkClipBox(r, rect_return)
TkRegion r;
XRectangle* rect_return;
{
RECT rect;
GetRgnBox((HRGN)r, &rect);
rect_return->x = (short) rect.left;
rect_return->y = (short) rect.top;
rect_return->width = (short) (rect.right - rect.left);
rect_return->height = (short) (rect.bottom - rect.top);
}
/*
*----------------------------------------------------------------------
*
* TkIntersectRegion --
*
* Compute the intersection of two regions.
*
* Results:
* Returns the result in the dr_return region.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkIntersectRegion(sra, srb, dr_return)
TkRegion sra;
TkRegion srb;
TkRegion dr_return;
{
CombineRgn((HRGN) dr_return, (HRGN) sra, (HRGN) srb, RGN_AND);
}
/*
*----------------------------------------------------------------------
*
* TkUnionRectWithRegion --
*
* Create the union of a source region and a rectangle.
*
* Results:
* Returns the result in the dr_return region.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
void
TkUnionRectWithRegion(rectangle, src_region, dest_region_return)
XRectangle* rectangle;
TkRegion src_region;
TkRegion dest_region_return;
{
HRGN rectRgn = CreateRectRgn(rectangle->x, rectangle->y,
rectangle->x + rectangle->width, rectangle->y + rectangle->height);
CombineRgn((HRGN) dest_region_return, (HRGN) src_region,
(HRGN) rectRgn, RGN_OR);
DeleteObject(rectRgn);
}
/*
*----------------------------------------------------------------------
*
* TkRectInRegion --
*
* Test whether a given rectangle overlaps with a region.
*
* Results:
* Returns RectanglePart or RectangleOut. Note that this is
* not a complete implementation since it doesn't test for
* RectangleIn.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TkRectInRegion(r, x, y, width, height)
TkRegion r;
int x;
int y;
unsigned int width;
unsigned int height;
{
RECT rect;
rect.top = y;
rect.left = x;
rect.bottom = y+height;
rect.right = x+width;
return RectInRegion((HRGN)r, &rect) ? RectanglePart : RectangleOut;
}
|