drawObject method

  1. @override
void drawObject(
  1. Canvas canvas,
  2. Size size
)
override

Draws the arrow on the provided canvas of size size.

Implementation

@override
void drawObject(Canvas canvas, Size size) {
  final arrowHeadSize = _arrowHeadSize;

  final dx = length / 2 * scale - arrowHeadSize;

  final start = position.translate(-length / 2 * scale + arrowHeadSize, 0);
  final end = position.translate(dx, 0);

  if ((end - start).dx > 0) canvas.drawLine(start, end, paint);

  final pathDx = dx /*.clamp(-arrowHeadSize/2, double.infinity)*/;

  final path = Path();
  path.moveTo(position.dx + pathDx + arrowHeadSize, position.dy);
  path.lineTo(position.dx + pathDx, position.dy - (arrowHeadSize / 2));
  path.lineTo(position.dx + pathDx, position.dy + (arrowHeadSize / 2));
  path.lineTo(position.dx + pathDx + arrowHeadSize, position.dy);

  path.moveTo(position.dx - pathDx - arrowHeadSize, position.dy);
  path.lineTo(position.dx - pathDx, position.dy - (arrowHeadSize / 2));
  path.lineTo(position.dx - pathDx, position.dy + (arrowHeadSize / 2));
  path.lineTo(position.dx - pathDx - arrowHeadSize, position.dy);

  final headPaint = paint.copyWith(
    style: PaintingStyle.fill,
  );

  canvas.drawPath(path, headPaint);
}