/**
 * Converts an unpacked complex data value holding a dimension to its final floating 
 * point value. The two parameters <var>unit</var> and <var>value</var>
 * are as in {@link #TYPE_DIMENSION}.
 *  
 * @param unit The unit to convert from.
 * @param value The value to apply the unit to.
 * @param metrics Current display metrics to use in the conversion -- 
 *                supplies display density and scaling information.
 * 
 * @return The complex floating point value multiplied by the appropriate 
 * metrics depending on its unit. 
 */
public static float applyDimension(int unit, float value,
                                   DisplayMetrics metrics)
{
    switch (unit) {
    case COMPLEX_UNIT_PX:
        return value;
    case COMPLEX_UNIT_DIP:
        return value * metrics.density;
    case COMPLEX_UNIT_SP:
        return value * metrics.scaledDensity;
    case COMPLEX_UNIT_PT:
        return value * metrics.xdpi * (1.0f/72);
    case COMPLEX_UNIT_IN:
        return value * metrics.xdpi;
    case COMPLEX_UNIT_MM:
        return value * metrics.xdpi * (1.0f/25.4f);
    }
    return 0;
}