Java tutorial
//package com.java2s; /* * Collab canvas - Java framework for graphics software enabling offline and shared * painting * Copyright (C) 2012 Martin Indra <aktive@seznam.cz> * * This file is part of Collab canvas. * * Collab canvas 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. * * Collab canvas 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 Collab canvas. If not, see <http://www.gnu.org/licenses/>. */ import java.awt.image.BufferedImage; public class Main { protected static boolean testNeighbour(BufferedImage source, int x, int y, boolean alpha) { if (x >= 0 && y >= 0 && x < source.getWidth() && y < source.getHeight()) { int gray = source.getRGB(x, y) & 0x000000ff; int alphaI = (source.getRGB(x, y) & 0xff000000) >>> 24; return (alpha && alphaI == 0) || (!alpha && gray == 255); } return true; } }