draw method

  1. @override
void draw(
  1. Canvas canvas,
  2. Size size,
  3. bool deeper
)
override

绘制核心方法

  • deeper 当前是否为底层绘制
  • 出于性能考虑
  • 绘制过程为表层绘制，绘制完成抬起手指时会进行底层绘制

Implementation

@override
void draw(Canvas canvas, Size size, bool deeper) {
  if (points.isEmpty) {
    return;
  }

  if (points.length == 1) {
    // 单点绘制
    canvas.drawCircle(points[0], strokeWidthList[0] / 8, paint);
    return;
  }

  if (useBezierCurve && points.length > 2) {
    // 使用贝塞尔曲线绘制平滑线条
    _drawWithBezierCurve(canvas);
  } else {
    // 使用原始的直线绘制
    _drawWithStraightLines(canvas);
  }
}