exp005 - Influenza Map Visualization


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#include "pick_convert.h"

/*
 * Width and height of a selection box about a single-click selection.
 */
#define N 3.0

void
pick_convert (int select_x, int select_y, int x, int y,
	      double *c_x, double *c_y, double *w, double *h)
{
  /*
   * Calculate X and the width.
   */
  if (x > select_x)
    {
      *c_x = (x - select_x) / 2.0 + select_x;
      *w = x - select_x;
    }
  else if (x < select_x)
    {
      *c_x = (select_x - x) / 2.0 + x;
      *w = select_x - x;
    }
  else
    {
      *c_x = x;
      *w = N;
    }

  /*
   * Calculate Y and the width.
   */
  if (y > select_y)
    {
      *c_y = (y - select_y) / 2.0 + select_y;
      *h = y - select_y;
    }
  else if (y < select_y)
    {
      *c_y = (select_y - y) / 2.0 + y;
      *h = select_y - y;
    }
  else
    {
      *c_y = y;
      *h = N;
    }

  return;
}