ColorPickerDialog.java 文件源码

private int rotateColor(int color, float rad) {
    float deg = rad * 180 / 3.1415927f;
    int r = Color.red(color);
    int g = Color.green(color);
    int b = Color.blue(color);

    ColorMatrix cm = new ColorMatrix();
    ColorMatrix tmp = new ColorMatrix();

    cm.setRGB2YUV();
    tmp.setRotate(0, deg);
    cm.postConcat(tmp);
    tmp.setYUV2RGB();
    cm.postConcat(tmp);

    final float[] a = cm.getArray();

    int ir = floatToByte(a[0] * r + a[1] * g + a[2] * b);
    int ig = floatToByte(a[5] * r + a[6] * g + a[7] * b);
    int ib = floatToByte(a[10] * r + a[11] * g + a[12] * b);

    return Color.argb(Color.alpha(color), pinToByte(ir),
            pinToByte(ig), pinToByte(ib));
}