Create a multiple buffer strategy with the number of buffers given
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/**
* This test takes a number up to 13 as an argument (assumes 2 by
* default) and creates a multiple buffer strategy with the number of
* buffers given. This application enters full-screen mode, if available,
* and flips back and forth between each buffer (each signified by a different
* color).
*/
import java.awt.Color;
import java.awt.DisplayMode;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Rectangle;
import java.awt.image.BufferStrategy;
public class MultiBufferTest {
private static Color[] COLORS = new Color[] { Color.red, Color.blue,
Color.green, Color.white, Color.black, Color.yellow, Color.gray,
Color.cyan, Color.pink, Color.lightGray, Color.magenta, Color.orange,
Color.darkGray };
private static DisplayMode[] BEST_DISPLAY_MODES = new DisplayMode[] {
new DisplayMode(640, 480, 32, 0), new DisplayMode(640, 480, 16, 0),
new DisplayMode(640, 480, 8, 0) };
Frame mainFrame;
public MultiBufferTest(int numBuffers, GraphicsDevice device) {
try {
GraphicsConfiguration gc = device.getDefaultConfiguration();
mainFrame = new Frame(gc);
mainFrame.setUndecorated(true);
mainFrame.setIgnoreRepaint(true);
device.setFullScreenWindow(mainFrame);
if (device.isDisplayChangeSupported()) {
chooseBestDisplayMode(device);
}
Rectangle bounds = mainFrame.getBounds();
mainFrame.createBufferStrategy(numBuffers);
BufferStrategy bufferStrategy = mainFrame.getBufferStrategy();
for (float lag = 2000.0f; lag > 0.00000006f; lag = lag / 1.33f) {
for (int i = 0; i < numBuffers; i++) {
Graphics g = bufferStrategy.getDrawGraphics();
if (!bufferStrategy.contentsLost()) {
g.setColor(COLORS[i]);
g.fillRect(0, 0, bounds.width, bounds.height);
bufferStrategy.show();
g.dispose();
}
try {
Thread.sleep((int) lag);
} catch (InterruptedException e) {
}
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
device.setFullScreenWindow(null);
}
}
private static DisplayMode getBestDisplayMode(GraphicsDevice device) {
for (int x = 0; x < BEST_DISPLAY_MODES.length; x++) {
DisplayMode[] modes = device.getDisplayModes();
for (int i = 0; i < modes.length; i++) {
if (modes[i].getWidth() == BEST_DISPLAY_MODES[x].getWidth()
&& modes[i].getHeight() == BEST_DISPLAY_MODES[x].getHeight()
&& modes[i].getBitDepth() == BEST_DISPLAY_MODES[x].getBitDepth()) {
return BEST_DISPLAY_MODES[x];
}
}
}
return null;
}
public static void chooseBestDisplayMode(GraphicsDevice device) {
DisplayMode best = getBestDisplayMode(device);
if (best != null) {
device.setDisplayMode(best);
}
}
public static void main(String[] args) {
try {
int numBuffers = 2;
if (args != null && args.length > 0) {
numBuffers = Integer.parseInt(args[0]);
if (numBuffers < 2 || numBuffers > COLORS.length) {
System.err.println("Must specify between 2 and " + COLORS.length
+ " buffers");
System.exit(1);
}
}
GraphicsEnvironment env = GraphicsEnvironment
.getLocalGraphicsEnvironment();
GraphicsDevice device = env.getDefaultScreenDevice();
MultiBufferTest test = new MultiBufferTest(numBuffers, device);
} catch (Exception e) {
e.printStackTrace();
}
System.exit(0);
}
}
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