问题描述
我创建了一个自定义油漆抽屉,效果很好,但我喜欢创建自定义画笔类型,如书法画笔、蜡笔画笔等...
class DrawingPainter extends CustomPainter {
DrawingPainter({this.pointsList}) : super();
List<DrawingPoints> pointsList;
@override
void paint(Canvas canvas,Size size) {
for (int i = 0; i < pointsList.length - 1; i++) {
if (pointsList[i] != null) {
canvas.saveLayer(Offset.zero & size,Paint());
if (shouldDrawLine(i)) {
canvas.drawLine(pointsList[i].points,pointsList[i + 1].points,pointsList[i].paint);
} else if (shouldDrawPoint(i)) {
canvas.drawPoints(dartUI.PointMode.polygon,[pointsList[i].points,pointsList[i].points],pointsList[i].paint);
}
canvas.restore();
}
}
}
bool shouldDrawPoint(int i) =>
pointsList[i] != null && pointsList.length > i + 1 && pointsList[i + 1] == null;
bool shouldDrawLine(int i) =>
pointsList[i] != null && pointsList.length > i + 1 && pointsList[i + 1] != null;
@override
bool shouldRepaint(DrawingPainter oldDelegate) => true;
}
这是我的绘图代码。我如何像那些类型的画笔一样修改画笔绘制图案?
解决方法
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