在Android中填充两个圆圈的交叉区域

Question

我的应用程序包含一个calculatePosition（），它绘制了四个圆圈：

private void calculatePosition(){
    Paint paint = new Paint();
    paint.setColor(Color.RED);
    paint.setStyle(Paint.Style.STROKE);
    paint.setStrokeWidth(10);

    float ratio = (float) (640/3.45);

    float radiusB1 = Calculations.convertscale(scale, position[0] * ratio);
    float radiusB2 = Calculations.convertscale(scale, position[1] * ratio);
    float radiusB3 = Calculations.convertscale(scale, position[2] * ratio);
    float radiusB4 = Calculations.convertscale(scale, position[3] * ratio);



    canvas.drawCircle(broadCaster1x, broadCaster1y, radiusB1, paint);
    canvas.drawCircle(broadCaster2x, broadCaster2y, radiusB2, paint);
    canvas.drawCircle(broadCaster3x, broadCaster3y, radiusB3, paint);
    canvas.drawCircle(broadCaster4x, broadCaster4y, radiusB4, paint);
}

我想知道在Android中是否可以填充两个圆圈之间的交叉区域，如下图所示。如果是，是否有任何基本的例子如何获得它？。

Answer 1

使用＆＃39; Canvas.clipPath＆＃39;

例如：

Path pathA = new Path();
pathA.addCircle(xCenterA, yCenterA, radiusA, Direction.CW);
Path pathB = new Path();
pathB.addCircle(xCenterB, yCenterB, radiusB, Direction.CW);
canvas.clipPath(pathA);
canvas.clipPath(pathB, Region.Op.DIFFERENCE);