ShadowColor.java

package org.robolectric.shadows;

import android.graphics.Color;
import org.robolectric.annotation.Implements;
import org.robolectric.annotation.Implementation;

@Implements(Color.class)
public class ShadowColor {
  /**
   * This is implemented in native code in the Android SDK.
   *
   * Since HSV == HSB then the implementation from {@link java.awt.Color} can be used,
   * with a small adjustment to the representation of the hue.
   *
   * {@link java.awt.Color} represents hue as 0..1 (where 1 == 100% == 360 degrees),
   * while {@link android.graphics.Color} represents hue as 0..360 degrees. The correct hue
   * can be calculated by multiplying with 360.
   *
   * @param red Red component
   * @param green Green component
   * @param blue Blue component
   * @param hsv Array to store HSV components
   */
  @Implementation
  public static void RGBToHSV(int red, int green, int blue, float hsv[]) {
    java.awt.Color.RGBtoHSB(red, green, blue, hsv);
    hsv[0] = hsv[0] * 360;
  }

  @Implementation
  public static int HSVToColor(int alpha, float hsv[]) {
    int rgb = java.awt.Color.HSBtoRGB(hsv[0] / 360, hsv[1], hsv[2]);
    return Color.argb(alpha, Color.red(rgb), Color.green(rgb), Color.blue(rgb));
  }
}