Java Game Development(16) - Updating Display and Restore Screen

import java.awt.*;

import java.awt.image.BufferStrategy;

import java.awt.image.BufferedImage;

import java.lang.reflect.InvocationTargetException;

import javax.swing.JFrame;

public class ScreenManager {

private GraphicsDevice vc;

//訪問顯示器屏幕

public ScreenManager(){

GraphicsEnvironment e = GraphicsEnvironment.getLocalGraphicsEnvironment();

vc = e.getDefaultScreenDevice();

}

//得到所有兼容

public DisplayMode[] getCompatibleDisplayMode(){ → Build-in Method

return vc.getDisplayModes();

}

//比較DisplayMode傳遞到vc，看它們是否匹配(boolean)

public DisplayMode findFirstCompatibleMode(DisplayMode modes[]){

DisplayMode goodModes[] = vc.getDisplayModes();

for(int x=0;x<modes.length;x++){ → 循環DisplayMode列陣

for(int y=0;y<goodModes.length;y++){ → 循環DisplayMode列陣

if(displayModesMatch(modes[x], goodModes[y])){

return modes[x];

}

}

}

return null;

}

//得到當前DisplayMode

public DisplayMode getCurrentDisplayMode(){

return vc.getDisplayMode();

}

//檢查兩種模式是否相互匹配

public boolean displayModesMatch(DisplayMode m1,DisplayMode m2){

if(m1.getWidth() != m2.getWidth() || m1.getHeight() != m2.getHeight()){

return false;

}

if(m1.getBitDepth() != DisplayMode.BIT_DEPTH_MULTI && m2.getBitDepth() != DisplayMode.BIT_DEPTH_MULTI && m1.getBitDepth() != m2.getBitDepth()) {

return false;

}

if(m1.getRefreshRate() != DisplayMode.REFRESH_RATE_UNKNOWN && m2.getRefreshRate() != DisplayMode.REFRESH_RATE_UNKNOWN && m1.getRefreshRate() != m2.getRefreshRate()) {

return false;

}

return true;

}

//全屏幕

public void setFullScreen(DisplayMode dm){

JFrame f = new JFrame();

f.setUndecorated(true);

f.setIgnoreRepaint(true);

f.setResizable(false);

vc.setFullScreenWindow(f);

if(dm != null && vc.isDisplayChangeSupported()) {

try{

vc.setDisplayMode(dm);

}catch(Exception e) {System.out.println("");}

}

f.createBufferStrategy(2); → 兩個不同緩衝區中使用顯示器

}

//我們將設置圖形對象

public Graphics2D getGraphics() {

Window w = vc.getFullScreenWindow();

if(w != null) {

BufferStrategy s = w.getBufferStrategy();

return (Graphics2D)s.getDrawGraphics();

}

else {

return null;

}

}

//更新顯示

public void update() {

Window w = vc.getFullScreenWindow();

if(w != null) {

BufferStrategy s = w.getBufferStrategy();

if(!s.contentsLost()) { → 如果內容不丟失

s.show();

}

}

}

//返回全屏窗口

public Window getFullScreenWindow() {

return vc.getFullScreenWindow();

}

//得到寬度

public int getWidth() {

Window w = vc.getFullScreenWindow();

if(w != null) {

return w.getWidth();

}

else {

return 0;

}

}

//得到高度

public int getHeight() {

Window w = vc.getFullScreenWindow();

if(w != null) {

return w.getHeight();

}

else {

return 0;

}

}

//獲得全屏

public void restoreScreen(){

Window w = vc.getFullScreenWindow();

if(w != null) {

w.dispose();

vc.setFullScreenWindow(null);

}

}

}