本文介绍了在Arc中心绘制位图?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
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 Arc
s 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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