[英]Draw circle with different border colors Android
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;
}
Simple this code draws a circle with white border, however I want part of the border to be black and the other part white. 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 % of it black, 60 % of it white
40%的黑色,60%的白色
How can this be done? 如何才能做到这一点?
Try this code 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);
}
}
Here a utility method for filling a circle with one color and stroking the circle border with another color. 这里是一种用一种颜色填充圆圈并用另一种颜色抚摸圆形边框的实用方法。
Use the second method to pass in an existing Paint instance, eg to set the anti-alias flag or to prevent memory allocations during onDraw(). 使用第二种方法传入现有的Paint实例,例如设置反别名标志或在onDraw()期间阻止内存分配。
public static void fillCircleStrokeBorder(
Canvas c, float cx, float cy, float radius,
int circleColor, float borderWidth, int borderColor) {
fillCircleStrokeBorder(c, cx, cy, radius, circleColor, borderWidth, borderColor, new Paint());
}
public static void fillCircleStrokeBorder(
Canvas c, float cx, float cy, float radius,
int circleColor, float borderWidth, int borderColor, Paint p) {
int saveColor = p.getColor();
p.setColor(circleColor);
Paint.Style saveStyle = p.getStyle();
p.setStyle(Paint.Style.FILL);
c.drawCircle(cx, cy, radius, p);
if (borderWidth > 0) {
p.setColor(borderColor);
p.setStyle(Paint.Style.STROKE);
float saveStrokeWidth = p.getStrokeWidth();
p.setStrokeWidth(borderWidth);
c.drawCircle(cx, cy, radius - (borderWidth / 2), p);
p.setStrokeWidth(saveStrokeWidth);
}
p.setColor(saveColor);
p.setStyle(saveStyle);
}
只需用一种颜色绘制全尺寸的圆圈,然后在相同的坐标处再次绘制圆圈,但使用不同的颜色和较小的半径,并缩小半径,无论你需要多少,这将是最简单的方法去做吧。
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