Find components of color of the bitmap at x, y. : Bitmap « 2D Graphics « Android






  1. Android
  2. 2D Graphics
  3. Bitmap

Find components of color of the bitmap at x, y.

    
/**
 *  Color Picker by Juan Mart?
 *  Copyright (C) 2010 nauj27.com
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
//package com.nauj27.android.colorpicker;

import java.util.Iterator;
import java.util.List;

import android.graphics.Bitmap;
import android.graphics.Color;
import android.graphics.drawable.BitmapDrawable;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.view.View;
import android.widget.ImageView;

/**
 * @author nauj27
 *
 */
 class Utils {
  
  
  
  /**
   * Fill hex string with "0" when hexString minor than F.
   * @param hexString
   * @return
   */
  public static String beautyHexString(String hexString) {
    if (hexString.length() < 2) {
      return "0".concat(hexString);
    } else {
      return hexString;
    }
  }
  
  /**
     * Find components of color of the bitmap at x, y. 
     * @param x Distance from left border of the View
     * @param y Distance from top of the View
     * @param view Touched surface on screen
     */
  public static int findColor(View view, int x, int y) 
  throws NullPointerException {
    
    int red = 0;
      int green = 0;
      int blue = 0;
      int color = 0;
      
      int offset = 1; // 3x3 Matrix
      int pixelsNumber = 0;
      
      int xImage = 0;
      int yImage = 0;
      
      // Get the bitmap from the view.
      ImageView imageView = (ImageView)view;
      BitmapDrawable bitmapDrawable = (BitmapDrawable)imageView.getDrawable();
      Bitmap imageBitmap = bitmapDrawable.getBitmap();

        // Calculate the target in the bitmap.
      xImage = (int)(x * ((double)imageBitmap.getWidth() / (double)imageView.getWidth()));
      yImage = (int)(y * ((double)imageBitmap.getHeight() / (double)imageView.getHeight()));
      
        // Average of pixels color around the center of the touch.
      for (int i = xImage - offset; i <= xImage + offset; i++) {
        for (int j = yImage - offset; j <= yImage + offset; j++) {
          try {
              color = imageBitmap.getPixel(i, j);
              red += Color.red(color);
              green += Color.green(color);
              blue += Color.blue(color);
              pixelsNumber += 1;
            } catch(Exception e) {
              //Log.w(TAG, "Error picking color!");
            }  
        }
      }
      red = red / pixelsNumber;
      green = green / pixelsNumber;
      blue = blue / pixelsNumber;
      
      return Color.rgb(red, green, blue); 
  }
  
}








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