我一直在为学校开发Java游戏，但我遇到了一个问题。在创建我的菜单时（我现在就是这个）我尝试使用精灵创建一个按钮。
我现在就拥有它，以便当鼠标放在精灵上时，它会改变图像但我想在按下它时显示不同的精灵。然后当释放鼠标时，当鼠标悬停在图像上时，精灵将恢复为精灵。
游戏类：
import java.awt.Canvas;
import java.awt.Color;
//import java.awt.Color;
import java.awt.Dimension;
//import java.awt.Font;
//import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferStrategy;
import java.awt.image.BufferedImage;
import javax.swing.JFrame;
public class Game extends Canvas implements Runnable {
private static final long serialVersionUID = 1L;
// This is the width, height, scale and title of the window.
public static int width = 1280 / 4;
public static int height = 720 / 4;
public static int scale = 4;
public static String title = "Ultimate Defender 2";
// Mouse object created.
private Mouse mouse = new Mouse();
// Creates all the SpriteSheet objects.
public SpriteSheet menubackgroundimage = new SpriteSheet();
public SpriteSheet menutitle = new SpriteSheet();
public SpriteSheet playbutton[] = new SpriteSheet[3];
public SpriteSheet continuebutton[] = new SpriteSheet[3];
public SpriteSheet scoresbutton[] = new SpriteSheet[3];
public SpriteSheet settingsbutton[] = new SpriteSheet[3];
public SpriteSheet exitbutton[] = new SpriteSheet[3];
public SpriteSheet backgroundimage = new SpriteSheet();
public SpriteSheet mobs = new SpriteSheet();
public SpriteSheet turret = new SpriteSheet();
// Creates the thread, frame and graphics objects.
private Thread thread;
private JFrame frame;
private Graphics2D graphics;
// Running variable is created to see if the game is running or not.
// Is used with the thread object.
private boolean running = false;
// Creates a BufferedImage object.
// private BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// The constructor is initialized at launch of the game.
public Game() {
Dimension size = new Dimension(width * scale, height * scale);
setPreferredSize(size);
frame = new JFrame();
addMouseMotionListener(mouse);
addMouseListener(mouse);
}
// Starts the thread.
public synchronized void start() {
running = true;
thread = new Thread(this, "Display");
thread.start();
}
// Stops the thread.
public synchronized void stop() {
running = false;
try {
thread.join();
} catch(InterruptedException e) {
e.printStackTrace();
}
}
// Loads the UPS and FPS and also initializes certain stuff.
public void run() {
init();
long lastTime = System.nanoTime();
long timer = System.currentTimeMillis();
final double ns = 1000000000.0 / 60.0;
double delta = 0;
int frames = 0;
int updates = 0;
while (running) {
long now = System.nanoTime();
delta += (now - lastTime) / ns;
lastTime = now;
while (delta >= 1) {
update();
updates++;
delta--;
}
render();
frames++;
if (System.currentTimeMillis() - timer > 1000) {
timer += 1000;
frame.setTitle(title + " | " + updates + " UPS, " + frames + " FPS");
updates = 0;
frames = 0;
}
}
stop();
}
// Initializes objects such as images and other stuff.
private void init() {
initializeSprites();
}
// Initializes all of the sprite images.
private void initializeSprites() {
menubackgroundimage.loadSpriteSheet("images/Menu-Background.png");
menutitle.loadSpriteSheet("images/Ultimate-Defender-2.png");
for (int i = 0; i < 3; i++) {
playbutton[i] = new SpriteSheet();
playbutton[i].loadSpriteSheet("images/Start" + (i + 1) + ".png");
continuebutton[i] = new SpriteSheet();
continuebutton[i].loadSpriteSheet("images/Continue" + (i + 1) + ".png");
scoresbutton[i] = new SpriteSheet();
scoresbutton[i].loadSpriteSheet("images/Scores" + (i + 1) + ".png");
settingsbutton[i] = new SpriteSheet();
settingsbutton[i].loadSpriteSheet("images/Settings" + (i + 1) + ".png");
exitbutton[i] = new SpriteSheet();
exitbutton[i].loadSpriteSheet("images/Exit" + (i + 1) + ".png");
}
// backgroundimage.loadSpriteSheet("images/grass.png");
// mobs.loadSpriteSheet("images/.png");
// turret.loadSpriteSheet("images/.png");
}
// Updates game objects.
public void update() {
}
// This renders all images and other stuff.
public void render() {
BufferStrategy bs = getBufferStrategy();
if (bs == null) {
createBufferStrategy(3);
return;
}
graphics = (Graphics2D) bs.getDrawGraphics();
draw();
graphics.dispose();
bs.show();
}
// Calls gameState which decides what to draw.
private void draw() {
gameState();
}
// Calls all methods that will be needed for creating the images for the game depending on what state it's in.
private void gameState() {
// Menu
drawMenuBackground();
drawMenuTitle();
drawPlayButton();
drawContinueButton();
drawScoresButton();
drawSettingsButton();
drawExitButton();
}
// Draws the menu background.
private void drawMenuBackground() {
BufferedImage MenuBackground = menubackgroundimage.getSprite(0, 0, 900, 540);
graphics.drawImage(MenuBackground, 0, 0, 1280, 720, null);
}
// Draws the menu title.
private void drawMenuTitle() {
BufferedImage MenuTitle = menutitle.getSprite(0, 0, 1043, 160);
graphics.drawImage(MenuTitle, ((getWidth() / 2) - (1043 / 2)), 65, 1043, 160, null);
}
// Draws the play button.
public void drawPlayButton() {
Point2D mouseCoord = new Point2D.Double(mouse.getMouseX(), mouse.getMouseY());
Rectangle2D playButton = new Rectangle2D.Double(((getWidth() / 2) - (178 / 2)), 275, 178, 66);
BufferedImage PlayButton[] = new BufferedImage[3];
for (int i = 0; i < 3; i++) {
PlayButton[i] = playbutton[i].getSprite(0, 0, 178, 66);
}
if (playButton.contains(mouseCoord)) {
if (mouse.isMousePressed()) {
graphics.drawImage(PlayButton[2], ((getWidth() / 2) - (178 / 2)), 275, 178, 66, null);
if (mouse.isMouseReleased()) {
graphics.drawImage(PlayButton[1], ((getWidth() / 2) - (178 / 2)), 275, 178, 66, null);
}
}
else {
graphics.drawImage(PlayButton[1], ((getWidth() / 2) - (178 / 2)), 275, 178, 66, null);
}
}
else {
graphics.drawImage(PlayButton[0], ((getWidth() / 2) - (178 / 2)), 275, 178, 66, null);
}
}
// Draws the continue button.
public void drawContinueButton() {
Point2D mouseCoord = new Point2D.Double(mouse.getMouseX(), mouse.getMouseY());
Rectangle2D continueButton = new Rectangle2D.Double(((getWidth() / 2) - (241 / 2)), 355, 241, 69);
BufferedImage ContinueButton[] = new BufferedImage[3];
for (int i = 0; i < 3; i++) {
ContinueButton[i] = continuebutton[i].getSprite(0, 0, 241, 69);
}
if (continueButton.contains(mouseCoord)) {
graphics.drawImage(ContinueButton[1], ((getWidth() / 2) - (241 / 2)), 355, 241, 69, null);
}
else {
graphics.drawImage(ContinueButton[0], ((getWidth() / 2) - (241 / 2)), 355, 241, 69, null);
}
}
// Draws the scores button.
public void drawScoresButton() {
Point2D mouseCoord = new Point2D.Double(mouse.getMouseX(), mouse.getMouseY());
Rectangle2D scoresButton = new Rectangle2D.Double(((getWidth() / 2) - (208 / 2)), 435, 208, 66);
BufferedImage ScoresButton[] = new BufferedImage[3];
for (int i = 0; i < 3; i++) {
ScoresButton[i] = scoresbutton[i].getSprite(0, 0, 208, 66);
}
if (scoresButton.contains(mouseCoord)) {
graphics.drawImage(ScoresButton[1], ((getWidth() / 2) - (208 / 2)), 435, 208, 66, null);
}
else {
graphics.drawImage(ScoresButton[0], ((getWidth() / 2) - (208 / 2)), 435, 208, 66, null);
}
}
// Draws the settings button.
public void drawSettingsButton() {
Point2D mouseCoord = new Point2D.Double(mouse.getMouseX(), mouse.getMouseY());
Rectangle2D settingsButton = new Rectangle2D.Double(((getWidth() / 2) - (238 / 2)), 515, 238, 76);
BufferedImage SettingsButton[] = new BufferedImage[3];
for (int i = 0; i < 3; i++) {
SettingsButton[i] = settingsbutton[i].getSprite(0, 0, 238, 76);
}
if (settingsButton.contains(mouseCoord)) {
graphics.drawImage(SettingsButton[1], ((getWidth() / 2) - (238 / 2)), 515, 238, 76, null);
}
else {
graphics.drawImage(SettingsButton[0], ((getWidth() / 2) - (238 / 2)), 515, 238, 76, null);
}
}
// Draws the exit button.
public void drawExitButton() {
Point2D mouseCoord = new Point2D.Double(mouse.getMouseX(), mouse.getMouseY());
Rectangle2D exitButton = new Rectangle2D.Double(((getWidth() / 2) - (148 / 2)), 595, 148, 69);
BufferedImage ExitButton[] = new BufferedImage[3];
for (int i = 0; i < 3; i++) {
ExitButton[i] = exitbutton[i].getSprite(0, 0, 148, 69);
}
if (exitButton.contains(mouseCoord)) {
graphics.drawImage(ExitButton[1], ((getWidth() / 2) - (148 / 2)), 595, 148, 69, null);
if (mouse.isMouseClicked()) {
System.exit(JFrame.EXIT_ON_CLOSE);
stop();
}
}
else {
graphics.drawImage(ExitButton[0], ((getWidth() / 2) - (148 / 2)), 595, 148, 69, null);
}
}
// Actually starts the game.
public static void main(String[] args) {
Game game = new Game();
game.frame.setResizable(false);
game.frame.setTitle(Game.title);
game.frame.add(game);
game.frame.pack();
game.frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
game.frame.setLocationRelativeTo(null);
game.frame.setVisible(true);
game.start();
}
}
SpriteSheet类：
import java.awt.image.*;
import java.io.IOException;
import javax.imageio.ImageIO;
public class SpriteSheet {
public BufferedImage spriteSheet;
public void loadSpriteSheet(String fileName) {
try {
// BufferedImage sheet = ImageIO.read(new File(fileName));
BufferedImage sheet = ImageIO.read(ResourceLoader.load(fileName));
spriteSheet = sheet;
} catch (IOException e) {System.out.println("No Image");}
}
public BufferedImage getSprite(int x, int y, int w, int h) {
BufferedImage sprite = spriteSheet.getSubimage(x, y, w, h);
return sprite;
}
}
ResourceLoader类：
import java.io.*;
public class ResourceLoader {
final static InputStream load(String path1){
InputStream input = ResourceLoader.class.getResourceAsStream(path1);
if(input == null){
input = ResourceLoader.class.getResourceAsStream("/" + path1);
}
return input;
}
}
鼠标类：
import java.awt.event.*;
public class Mouse implements MouseMotionListener,MouseListener{
private int mouseX, mouseY;
private boolean mouseClicked, mousePressed, mouseReleased;
public void mouseClicked(MouseEvent e) {
mouseClicked = true;
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
mousePressed = true;
}
public void mouseReleased(MouseEvent e) {
mouseReleased = true;
}
public void mouseDragged(MouseEvent arg0) {
}
public void mouseMoved(MouseEvent e) {
mouseX = e.getX();
mouseY= e.getY();
}
public int getMouseX() {
return mouseX;
}
public void setMouseX(int mouseX) {
this.mouseX = mouseX;
}
public int getMouseY() {
return mouseY;
}
public void setMouseY(int mouseY) {
this.mouseY = mouseY;
}
public boolean isMouseClicked() {
return mouseClicked;
}
public void setMouseClicked(boolean mouseClicked) {
this.mouseClicked = mouseClicked;
}
public boolean isMousePressed() {
return mousePressed;
}
public void setMousePressed(boolean mousePressed) {
this.mousePressed = mousePressed;
}
public boolean isMouseReleased() {
return mouseReleased;
}
public void setMouseReleased(boolean mouseReleased) {
this.mouseReleased = mouseReleased;
}
}