File: r_to_pix.c

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circlepack 5.1-3

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#include "cp_types.h"
#include "cp_proto.h"

/* real pt in box converted to double normpt relative to pix_box. */

int r_to_pix(complex pt, complex *normpt, Pix_box pix_box, Box box) 
{
  normpt->re=pix_box.lx+
    (pix_box.rx-pix_box.lx)*((pt.re-box.lx)/(box.rx-box.lx));
  normpt->im=pix_box.ry-
    (pix_box.ry-pix_box.ly)*((pt.im-box.ly)/(box.ry-box.ly));
  /* note: have flipped the y-coords because canvases treat + as down */
  return 1;
} /* r_to_pix */