[英]Canvas Paint: Draw shadow only on the left and right side
我正在 canvas 上繪制一個矩形,我想在左側和右側添加陰影/發光,但不在頂部和底部。 BlurMaskFilter
將是一個替代方案,但它也會影響兩個軸。
Paint paint = new Paint();
paint.setShadowLayer(10, 0, 0, Color.BLACK);
//paint.setMaskFilter(new BlurMaskFilter(10, BlurMaskFilter.Blur.NORMAL));
Rect rect = new Rect(0, 0, 10, 10);
canvas.drawRect(rect, paint);
我最終通過在陰影頂部使用PorterDuff.Mode.CLEAR
繪制一個新的Rect
來擦除這些區域。
Paint paint = new Paint();
paint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.CLEAR));
Rect rect = new Rect(left, top, right, bottom);
canvas.drawRect(rect, paint);
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