在画布上绘制波形形状(Android) [英] Drawing a squircle shape on canvas (Android)
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问题描述
这是我用来在画布上绘制圆形形状(然后在其上绘制图标位图)的东西:
Here is what I'm using to draw a circle shape on to the canvas (and then an icon bitmap on it):
private static Bitmap makeIcon(int radius, int color, Bitmap icon) {
final Bitmap output = Bitmap.createBitmap(radius, radius, Bitmap.Config.ARGB_8888);
final Canvas canvas = new Canvas(output);
final Paint paint = new Paint();
paint.setAntiAlias(true);
paint.setColor(color);
canvas.drawARGB(0, 0, 0, 0);
if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT)
canvas.drawCircle(radius / 2, radius / 2, radius / 2, paint);
else
canvas.drawRect(0, 0, radius, radius, paint);
int cx = (radius - icon.getWidth()) >> 1; // same as (...) / 2
int cy = (radius - icon.getHeight()) >> 1;
canvas.drawBitmap(icon, cx, cy, paint);
icon.recycle();
return output;
}
但是我不知道如何绘制圆盘形而不是圆形.仅供参考,以下是一些使用鼠形形状的图标的示例:
But I have no idea on how to draw a squircle shape instead of the circle shape. FYI, here are some examples of icons using the squircle shape:
推荐答案
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
Path squirclePath = getSquirclePaath(150, 250, 400);
canvas.drawPath(squirclePath, mPaint);
}
private static Path getSquirclePaath(int left, int top, int radius){
//Formula: (|x|)^3 + (|y|)^3 = radius^3
final double radiusToPow = radius * radius * radius;
Path path = new Path();
path.moveTo(-radius, 0);
for (int x = -radius ; x <= radius ; x++)
path.lineTo(x, ((float) Math.cbrt(radiusToPow - Math.abs(x * x * x))));
for (int x = radius ; x >= -radius ; x--)
path.lineTo(x, ((float) -Math.cbrt(radiusToPow - Math.abs(x * x * x))));
path.close();
Matrix matrix = new Matrix();
matrix.postTranslate(left + radius, top + radius);
path.transform(matrix);
return path;
}
希望这会有所帮助,以下是预览:
Hope this helps, here is a preview:
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