public static Bitmap drawCircle(int width,int height,int borderWidth) {
Bitmap canvasBitmap = Bitmap.createBitmap( width,height,Bitmap.Config.ARGB_8888);
BitmapShader shader = new BitmapShader(canvasBitmap,TileMode.CLAMP,TileMode.CLAMP);
Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setShader(shader);
paint.setShader(null);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.WHITE);
paint.setStrokeWidth(borderWidth);
Canvas canvas = new Canvas(canvasBitmap);
float radius = width > height ? ((float) height) / 2f : ((float) width) / 2f;
canvas.drawCircle(width / 2,height / 2,radius - borderWidth / 2,paint);
return canvasBitmap;
}
简单的这个代码绘制一个带有白色边框的圆圈,但是我希望边框的一部分是黑色而另一部分是白色的. 40％的黑色,60％的白色
如何才能做到这一点？
解决方法
试试这个代码
class MyView extends View
{
private Paint paint;
public MyView(Context context,int x,int y)
{
super(context);
paint = new Paint();
// PorterDuffXfermode xfermode = new PorterDuffXfermode(PorterDuff.Mode.CLEAR);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(Color.RED);
paint.setAlpha(255);
// paint.setXfermode(xfermode);
paint.setAntiAlias(true);
// setBackgroundColor(Color.BLACK);
}
@Override
protected void onDraw(Canvas canvas)
{
canvas.drawCircle(100,100,50,paint);
}
}
