MyListView.java 文件源码

/**
 * Calculates the lighting of the item based on rotation.
 * 
 * @param rotation The rotation of the item
 * @return A color filter to use
 */
private LightingColorFilter calculateLight(final float rotation) {
    final double cosRotation = Math.cos(Math.PI * rotation / 180);
    int intensity = AMBIENT_LIGHT + (int)(DIFFUSE_LIGHT * cosRotation);
    int highlightIntensity = (int)(SPECULAR_LIGHT * Math.pow(cosRotation, SHININESS));

    if (intensity > MAX_INTENSITY) {
        intensity = MAX_INTENSITY;
    }
    if (highlightIntensity > MAX_INTENSITY) {
        highlightIntensity = MAX_INTENSITY;
    }

    final int light = Color.rgb(intensity, intensity, intensity);
    final int highlight = Color.rgb(highlightIntensity, highlightIntensity, highlightIntensity);

    return new LightingColorFilter(light, highlight);
}