CustomPainter Path画布上的多余行

时间:2019-02-15 15:10:51

标签: dart flutter flutter-layout

我正在使用CustomPainter绘制线条

class ShapesPainter extends CustomPainter {
  @override
  void paint(Canvas canvas, Size size) {
    final Paint firstPaint = Paint();
    firstPaint.color = const Color.fromARGB(255, 236, 0, 140);

    final Path firstPath = Path();
    firstPath.lineTo(size.width, 0);
    firstPath.lineTo(0, size.height * 0.10);
    firstPath.close();
    canvas.drawShadow(firstPath, Colors.black87, 2.0, false);
    canvas.drawPath(firstPath, firstPaint);
 }
}

我需要在屏幕周围保留边距,因此我在容器中使用边距:

........
Container(
          color: Colors.white,
          margin:
              EdgeInsets.only(top: 60.0, bottom: 20.0, left: 15.0, right: 15.0),
          child: Container(
            child: CustomPaint(
              painter: ShapesPainter(),
              child: Container(
.......

我需要在我的自定义路径下绘制一个阴影,该阴影在构建小部件中使用了anvas.drawShadow方法,但是左侧也有一个小阴影,请看下面的图片,我指出了一个错误,这是指向小阴影的箭头: enter image description here

1 个答案:

答案 0 :(得分:0)

由于找不到关于canvas.drawShadow对Path的影响的解决方案,我只是在阴影路径的顶部创建了另一个Path(),解决了该问题,但有点像黑客。

final Path firstPathb = Path();
firstPathHide.lineTo(size.width, 0);
firstPathHide.lineTo(-10.0, size.height * 0.10);
firstPathHide.close();
canvas.drawPath(firstPathHide, firstPaint);