[fltk/fltk] Add functions for drawing rounded rectangles to the drawing api (#262) - Forums

Rounded rectangles have become a critical part of modern GUI design. However, FLTK provides minimal support for drawing rounded rectangles. The current Box api provides no means of setting a custom radius for RoundedFrames, which leaves it up to the programmer to design a custom solution. So, I think we could save people time by providing a method for drawing rounded rectangles.

static void rbox(int fill, int x, int y, int w, int h) {
  int i;
  int rs, rsy;
  rs = w*2/5; rsy = h*2/5;
  if (rs > rsy) rs = rsy; // use smaller radius
  if (rs > RS) rs = RS;
  if (rs == 5) rs = 4;  // use only even sizes for small corners (STR #2943)
  if (rs == 7) rs = 8;  // note: 8 is better than 6 (really)

  if (fill) fl_begin_polygon(); else fl_begin_loop();
  for (i=0; i<RN; i++)
    fl_vertex_r(x + offset[RN-i-1]*rs, y + offset[i] * rs);
  for (i=0; i<RN; i++)
    fl_vertex_r(x + offset[i]*rs, y + h-1 - offset[RN-i-1] * rs);
  for (i=0; i<RN; i++)
    fl_vertex_r(x + w-1 - offset[RN-i-1]*rs, y + h-1 - offset[i] * rs);
  for (i=0; i<RN; i++)
    fl_vertex_r(x + w-1 - offset[i]*rs, y + offset[RN-i-1] * rs);
  if (fill) fl_end_polygon(); else fl_end_loop();
}

While it's nice to be able to set the global radius size, we might also want to have rounded frames with different radiuses.

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