反转可绘制的颜色 [英] Invert colors of drawable
本文介绍了反转可绘制的颜色的处理方法,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
是否可以将Drawable
中的颜色反转"?你知道负片的种类吗?
Is it possible to "invert" colors in a Drawable
? Kind of what you have in a negative, you know?
我知道可以将Drawable
更改为黑白,但是反转颜色呢?
I know it's possible to change a Drawable
to black and white, but what about inverting colors?
推荐答案
经过研究,我发现解决方案比我想象的要简单得多.
After some research I found out that solution is much simpler than I thought.
这里是:
/**
* Color matrix that flips the components (<code>-1.0f * c + 255 = 255 - c</code>)
* and keeps the alpha intact.
*/
private static final float[] NEGATIVE = {
-1.0f, 0, 0, 0, 255, // red
0, -1.0f, 0, 0, 255, // green
0, 0, -1.0f, 0, 255, // blue
0, 0, 0, 1.0f, 0 // alpha
};
drawable.setColorFilter(new ColorMatrixColorFilter(NEGATIVE));
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