도형 그리기

//사용할때
CustomPaint(size: Size(200, 200), painter: DrawTriangle(color: Colors.white)),


class DrawTriangle extends CustomPainter {
  Color color;

  DrawTriangle({required this.color});

  @override
  void paint(Canvas canvas, Size size) {
    var path = Path();
    // path.moveTo(0, 0); // 시작위치
    path.lineTo(0, size.height);
    path.lineTo(size.width / 3, size.height / 2);
    path.close();
    canvas.drawPath(path, Paint()..color = color);
  }

path.lineTo
좌표 계산하면서

CustomPaint