| // Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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 common; |
| |
| import java.awt.Canvas; |
| import java.awt.Color; |
| import java.awt.Graphics; |
| import java.awt.Graphics2D; |
| import java.awt.image.BufferedImage; |
| |
| /** |
| * A <code>BuffereImageCanvas</code> component represents frame buffer image on the |
| * screen. It also notifies its subscribers when screen is repainted. |
| */ |
| public class BufferedImageCanvas extends Canvas { |
| private static final long serialVersionUID = 1L; |
| |
| // Offline screen buffer |
| protected BufferedImage offlineImage; |
| |
| // Cached Graphics2D object for offline screen buffer |
| private Graphics2D graphics; |
| |
| public BufferedImageCanvas(int width, int height) { |
| super(); |
| |
| setBackground(Color.black); |
| |
| setFocusable(true); |
| |
| // Don't intercept TAB key |
| setFocusTraversalKeysEnabled(false); |
| |
| setCanvasSize(width, height); |
| } |
| |
| public void setCanvasSize(int width, int height) { |
| offlineImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); |
| graphics = offlineImage.createGraphics(); |
| |
| setSize(offlineImage.getWidth(), offlineImage.getHeight()); |
| } |
| |
| @Override |
| public void update(Graphics g) { |
| // Call paint() directly, without clearing screen first |
| paint(g); |
| } |
| |
| @Override |
| public void paint(Graphics g) { |
| // Only part of image, requested with repaint(Rectangle), will be |
| // painted on screen. |
| g.drawImage(offlineImage, 0, 0, this); |
| } |
| |
| public BufferedImage getOfflineImage() { |
| return offlineImage; |
| } |
| |
| public Graphics2D getOfflineGraphics() { |
| return graphics; |
| } |
| |
| public void updateFrameBuffer(int x, int y, int w, int h) { |
| //this method will be used to mark the dirty tiles |
| } |
| |
| } |