Mega Code Archive
Find components of color of the bitmap at x, y
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/**
* 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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