roundedRectangleRgba function

bool roundedRectangleRgba(Pointer<SdlRenderer> renderer, double x1, double y1, double x2, double y2, double rad, int r, int g, int b, int a, { int blendMode = SDL_BLENDMODE_BLEND, })

Implementation

bool roundedRectangleRgba(
  Pointer<SdlRenderer> renderer,
  double x1,
  double y1,
  double x2,
  double y2,
  double rad,
  int r,
  int g,
  int b,
  int a, {
  int blendMode = SDL_BLENDMODE_BLEND,
}) {
  var result = true;
  var x10 = x1;
  var y10 = y1;
  var x20 = x2;
  var y20 = y2;
  var rad0 = rad;
  double tmp;
  double w;
  double h;
  double xx1;
  double xx2;
  double yy1;
  double yy2;

  /*
	* Check renderer
	*/
  if (renderer == nullptr) {
    return false;
  }

  /*
	* Check radius vor valid range
	*/
  if (rad0 < 0) {
    return false;
  }

  /*
	* Special case - no rounding
	*/
  if (rad0 <= 1) {
    return rectangleRgba(
      renderer,
      x10,
      y10,
      x20,
      y20,
      r,
      g,
      b,
      a,
      blendMode: blendMode,
    );
  }

  /*
	* Test for special cases of straight lines or single point
	*/
  if (x10 == x20) {
    if (y10 == y20) {
      return pixelRgba(renderer, x10, y10, r, g, b, a, blendMode: blendMode);
    } else {
      return vlineRgba(
        renderer,
        x10,
        y10,
        y20,
        r,
        g,
        b,
        a,
        blendMode: blendMode,
      );
    }
  } else {
    if (y10 == y20) {
      return hlineRgba(
        renderer,
        x10,
        x20,
        y10,
        r,
        g,
        b,
        a,
        blendMode: blendMode,
      );
    }
  }

  /*
	* Swap x10, x20 if required
	*/
  if (x10 > x20) {
    tmp = x10;
    x10 = x20;
    x20 = tmp;
  }

  /*
	* Swap y10, y20 if required
	*/
  if (y10 > y20) {
    tmp = y10;
    y10 = y20;
    y20 = tmp;
  }

  /*
	* Calculate width&height
	*/
  w = x20 - x10;
  h = y20 - y10;

  /*
	* Maybe adjust radius
	*/
  if ((rad0 * 2) > w) {
    rad0 = w / 2;
  }
  if ((rad0 * 2) > h) {
    rad0 = h / 2;
  }

  /*
	* Draw corners
	*/
  xx1 = x10 + rad0;
  xx2 = x20 - rad0;
  yy1 = y10 + rad0;
  yy2 = y20 - rad0;
  if (result) {
    result = arcRgba(
      renderer,
      xx1,
      yy1,
      rad0,
      180,
      270,
      r,
      g,
      b,
      a,
      blendMode: blendMode,
    );
  }
  if (result) {
    result = arcRgba(
      renderer,
      xx2,
      yy1,
      rad0,
      270,
      360,
      r,
      g,
      b,
      a,
      blendMode: blendMode,
    );
  }
  if (result) {
    result = arcRgba(
      renderer,
      xx1,
      yy2,
      rad0,
      90,
      180,
      r,
      g,
      b,
      a,
      blendMode: blendMode,
    );
  }
  if (result) {
    result = arcRgba(
      renderer,
      xx2,
      yy2,
      rad0,
      0,
      90,
      r,
      g,
      b,
      a,
      blendMode: blendMode,
    );
  }

  /*
	* Draw lines
	*/
  if (xx1 <= xx2) {
    if (result) {
      result = hlineRgba(
        renderer,
        xx1,
        xx2,
        y10,
        r,
        g,
        b,
        a,
        blendMode: blendMode,
      );
    }
    if (result) {
      result = hlineRgba(
        renderer,
        xx1,
        xx2,
        y20,
        r,
        g,
        b,
        a,
        blendMode: blendMode,
      );
    }
  }
  if (yy1 <= yy2) {
    if (result) {
      result = vlineRgba(
        renderer,
        x10,
        yy1,
        yy2,
        r,
        g,
        b,
        a,
        blendMode: blendMode,
      );
    }
    if (result) {
      result = vlineRgba(
        renderer,
        x20,
        yy1,
        yy2,
        r,
        g,
        b,
        a,
        blendMode: blendMode,
      );
    }
  }
  return result;
}