renderSpriteRotated method

void renderSpriteRotated({ required Image image, required double srcX, required double srcY, required double srcWidth, required double srcHeight, required double dstX, required double dstY, required double rotation, double anchorX = 0.5, double anchorY = 0.5, double scale = 1.0, int color = 1, })

The anchor determines the point around which the sprite is rotated

Implementation

void renderSpriteRotated({
  required ui.Image image,
  required double srcX,
  required double srcY,
  required double srcWidth,
  required double srcHeight,
  required double dstX,
  required double dstY,
  required double rotation,
  double anchorX = 0.5,
  double anchorY = 0.5,
  double scale = 1.0,
  int color = 1,
}){
  final scos = cos(rotation) * scale;
  final ssin = sin(rotation) * scale;

  final width = -scos * anchorX + ssin * anchorY;
  final height = -ssin * anchorX - scos * anchorY;

  final tx = dstX + width;
  final ty = dstY + height;

  final scaledHeight = srcHeight * scale * anchorY;
  final scaledWidth = srcWidth * scale * anchorX;

  const piHalf = pi * 0.5;

  final adjX = adj(rotation - piHalf, scaledHeight);
  final adjY = opp(rotation - piHalf, scaledHeight);

  final adjY2 = adj(rotation - piHalf, scaledWidth);
  final adjX2 = opp(rotation - piHalf, scaledWidth);

  bufferImage = image;
  render(
      color: color,
      srcLeft: srcX,
      srcTop: srcY,
      srcRight: srcX + srcWidth,
      srcBottom: srcY + srcHeight,
      scale: cos(rotation) * scale,
      rotation: sin(rotation) * scale,
      dstX: tx + adjX2 + adjX,
      dstY: ty - adjY2 + adjY,
  );
}