2217fbc5ff
* Basic implementation * implement double buffer * add unit test * add unit test * Add Readme * Change local value declaration to var * Remove unused fields
86 lines
3.2 KiB
Java
86 lines
3.2 KiB
Java
/**
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* The MIT License
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* Copyright (c) 2014-2016 Ilkka Seppälä
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* <p>
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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* <p>
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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* <p>
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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package com.iluwatar.doublebuffer;
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import org.apache.commons.lang3.tuple.MutablePair;
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import org.apache.commons.lang3.tuple.Pair;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* Double buffering is a term used to describe a device that has two buffers.
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* The usage of multiple buffers increases the overall throughput of a device
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* and helps prevents bottlenecks. This example shows using double buffer pattern
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* on graphics. It is used to show one image or frame while a separate frame
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* is being buffered to be shown next. This method makes animations and games
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* look more realistic than the same done in a single buffer mode.
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*/
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public class App {
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private static final Logger LOGGER = LoggerFactory.getLogger(App.class);
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/**
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* Program main entry point.
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* @param args runtime arguments
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*/
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public static void main(String[] args) {
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var scene = new Scene();
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List<Pair<Integer, Integer>> drawPixels = new ArrayList<>();
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Pair<Integer, Integer> pixel1 = new MutablePair<>(1, 1);
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Pair<Integer, Integer> pixel2 = new MutablePair<>(5, 6);
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Pair<Integer, Integer> pixel3 = new MutablePair<>(3, 2);
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drawPixels.add(pixel1);
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drawPixels.add(pixel2);
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drawPixels.add(pixel3);
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scene.draw(drawPixels);
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var buffer1 = scene.getBuffer();
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printBlackPixelCoordinate(buffer1);
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drawPixels.clear();
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Pair<Integer, Integer> pixel4 = new MutablePair<>(3, 7);
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Pair<Integer, Integer> pixel5 = new MutablePair<>(6, 1);
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drawPixels.add(pixel4);
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drawPixels.add(pixel5);
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scene.draw(drawPixels);
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Buffer buffer2 = scene.getBuffer();
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printBlackPixelCoordinate(buffer2);
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}
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private static void printBlackPixelCoordinate(Buffer buffer) {
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var log = "Black Pixels: ";
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Pixel[] pixels = buffer.getPixels();
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for (var i = 0; i < pixels.length; ++i) {
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if (pixels[i] == Pixel.BLACK) {
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var y = i / FrameBuffer.WIDTH;
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var x = i % FrameBuffer.WIDTH;
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log += " (" + x + ", " + y + ")";
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}
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}
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LOGGER.info(log);
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}
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}
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