如何将PointMode传递到Flutter中的Canvas.drawPoints（..）？

Question

我打电话的功能drawPoints如下，这是继API-doc

 final paint = new Paint() 
     ..color = Colors.blue[400] 
     ..strokeCap = StrokeCap.round; 
    var offsetList = [new Offset(2.0, 5.0), new Offset(50.0, 100.0)]; 
    canvas.drawPoints(const PointMode(1), offsetList, paint); 

当我通过在const PointMode(1)进入canvas.drawPoints，它抛出编译器错误。将PointMode传递给此函数的正确方法是什么？

Answer 1

PointMode是一个枚举，你不能实例化它。您可以从here检查所有可用的点模式。

要drawPoints方法指定PointMode，你可以改变

canvas.drawPoints(const PointMode(1), offsetList, paint); 

到

canvas.drawPoints(PointMode.points, offsetList, paint);