Android Open Source - GuiLib Color Util

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2010 Gandulf Kohlweiss/*w  ww  .ja  v  a 2 s  .  c  o m*/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.gandulf.guilib.util;

import android.graphics.Color;

public class ColorUtil {

  public static int darker(int color) {
    return darker(color, 0.2f);
  }

  public static int darker(int color, float factor) {
    float[] hsv = new float[3];
    Color.colorToHSV(color, hsv);
    hsv[2] *= (1f - factor); // value component
    color = Color.HSVToColor(hsv);
    return color;
  }

  public static int brighter(int color, float factor) {
    float[] hsv = new float[3];
    Color.colorToHSV(color, hsv);
    hsv[2] *= (1f + factor); // value component
    for (int i = 1; i < hsv.length; i++) {
      hsv[i] = Math.min(1.0f, hsv[i]);
    }
    color = Color.HSVToColor(hsv);
    return color;
  }

  public static int brighter(int color) {
    return brighter(color, 0.2f);
  }

  /**
   * Calculates the luminosity of a color
   * 
   * @param color
   * @return int luminosity [0..255]
   */
  public static int luminosity(int color) {
    return (int) (0.299 * Color.red(color) + 0.587 * Color.green(color) + 0.114 * Color.blue(color));
  }

  public static int addAlpha(int alpha, int color) {
    return Color.argb(alpha, Color.red(color), Color.green(color), Color.blue(color));
  }

  /**
   * @param color
   * @return
   */
  public static int getTextColor(int color) {
    if (luminosity(color) > 122)
      return Color.BLACK;
    else
      return Color.WHITE;

  }
}

Java Source Code List

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