ColorWheelView.java 文件源码

protected void updateColorDependant(boolean hsvChanged, boolean hueChanged){
    if (hueChanged) {
        Shader base = new LinearGradient(A.x, A.y, (B.x + C.x) / 2, (B.y + C.y) / 2,
                Color.HSVToColor(new float[]{mColor.hue(), 1, 1}), Color.BLACK, Shader.TileMode.CLAMP);
        Shader light = new LinearGradient((A.x + C.x) / 2, (A.y + C.y) / 2, B.x, B.y,
                Color.BLACK, Color.WHITE, Shader.TileMode.CLAMP);
        Shader both = new ComposeShader(base, light, PorterDuff.Mode.ADD);
        paint.setShader(both);
    }
    if (hsvChanged) {
        dotPaint.setColor(mColor.inverted().rgb());
        dot = new PointF(
                C.x + (B.x - C.x + (A.x - B.x) * mColor.sat()) * mColor.val(),
                C.y + (B.y - C.y + (A.y - B.y) * mColor.sat()) * mColor.val());
    }
}