ColorAreaPicker.java 文件源码

private void updateMainColors(int color) {
    if (baseColor == color) {
        return;
    }

    baseColor = color;

    Shader gradientShader = new LinearGradient(0.f,
                                               0.f,
                                               NUMBER_OF_GRADIENTS,
                                               0.f,
                                               Color.WHITE,
                                               baseColor,
                                               Shader.TileMode.CLAMP);
    ComposeShader shader = new ComposeShader(gradientShader,
                                             baseGradientShader,
                                             PorterDuff.Mode.MULTIPLY);
    gradientsPaint.setShader(shader);
    preRenderingCanvas
            .drawRect(0.f, 0.f, NUMBER_OF_GRADIENTS, NUMBER_OF_GRADIENTS, gradientsPaint);
}