在Arc中心绘制位图? [英] Draw a Bitmap in Arc center?

问题描述

在自定义视图"中，我绘制了多个填充的Arc，如下所示:

In my Custom View, I draw multiple filled Arcs like this:

canvas.drawArc(oval, startAngle, sweepAngle, true, sectorPaint);

现在，我想在弧的中心绘制一个图标.我从这里开始:

Now, I want to draw an icon on the center of the Arc. I started with this:

Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.my_icon);
canvas.drawBitmap(bitmap, pointX, pointY, null); //pointX & pointY ??

但是，我不知道应该为pointX和pointY设置什么.这是我的数据:

However, I don't know what should I set for pointX and pointY. Here is the data I have:

• 椭圆中心坐标和半径.
• startAngle和sweepAngle(因此可以派生endAngle)

是否有办法知道给出这些输入的值pointX和pointY?

Is there a way to know the values pointX and pointY giving those inputs?

插图草图:

推荐答案

此答案经过一些调整后对我有很大帮助:

This answer helped me a lot after some adjustments:

double radius = width/2;
double x = radius + (radius)*Math.cos(-angle);
double y = radius + (radius)*Math.sin(-angle);

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