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當我按下鍵盤輸入時，我的測試遊戲中的精靈以超高的速度飛離屏幕，我不知道爲什麼。2D java遊戲中的對象（Sprite）異常移動
KeyInput.java：
package com.cosmicluck.miner.framework;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import com.cosmicluck.miner.window.Handler;
public class KeyInput extends KeyAdapter
{
Handler handler;
public KeyInput(Handler handler)
{
this.handler = handler;
}
public void keyPressed(KeyEvent e)
{
int key = e.getKeyCode();
for(int i = 0; i < handler.object.size(); i++)
{
GameObject tempObject = handler.object.get(i);
if(tempObject.getId() == ObjectId.Player)
{
if(key == KeyEvent.VK_D) tempObject.setVelX(5);
if(key == KeyEvent.VK_A) tempObject.setVelX(-5);
}
}
if(key == KeyEvent.VK_ESCAPE)
{
System.exit(1);
}
}
public void keyReleased(KeyEvent e)
{
int key = e.getKeyCode();
for(int i = 0; i < handler.object.size(); i++)
{
GameObject tempObject = handler.object.get(i);
if(tempObject.getId() == ObjectId.Player)
{
if(key == KeyEvent.VK_D) tempObject.setVelX(0);
if(key == KeyEvent.VK_A) tempObject.setVelX(0);
}
}
}
}
改變速度什麼，但對於0使keyPressed物體飛出屏幕。
這裏是我的Player.java：
package com.cosmicluck.miner.objects;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.util.LinkedList;
import com.cosmicluc.miner.framework.GameObject;
import com.cosmicluc.miner.framework.ObjectId;
public class Player extends GameObject
{
private float width = 48, height = 96;
private float gravity = 0.5f;
private final float MAX_SPEED = 10;
public Player(float x, float y, ObjectId id) {
super(x, y, id);
}
public void tick(LinkedList<GameObject> object) {
x += velX;
y += velY;
if(falling || jumping)
{
velY += gravity;
if(velY > MAX_SPEED)
velY = MAX_SPEED;
}
}
public void render(Graphics g)
{
g.setColor(Color.BLUE);
g.fillRect((int)x, (int)y, (int)width, (int)height);
Graphics2D g2d = (Graphics2D) g;
g.setColor(Color.RED);
g2d.draw(getBounds());
g2d.draw(getBoundsRight());
g2d.draw(getBoundsLeft());
g2d.draw(getBoundsTop());
}
public Rectangle getBounds() {
return new Rectangle((int) ((int)x+(width/2)-((width/2)/2)), (int) ((int)y+(height/2)), (int)width/2, (int)height/2);
}
public Rectangle getBoundsTop() {
return new Rectangle((int) ((int)x+(width/2)-((width/2)/2)), (int)y, (int)width/2, (int)height/2);
}
public Rectangle getBoundsRight() {
return new Rectangle((int) ((int)x+width-5), (int)y+5, (int)5, (int)height-10);
}
public Rectangle getBoundsLeft() {
return new Rectangle((int)x, (int)y+5, (int)5, (int)height-10);
}
}
GameObject.java：
package com.cosmicluck.miner.framework;
import java.awt.Graphics;
import java.awt.Rectangle;
import java.util.LinkedList;
public abstract class GameObject
{
protected float x, y;
protected ObjectId id;
protected float velX = 0, velY = 0;
protected boolean falling = true;
protected boolean jumping = false;
public GameObject(float x, float y, ObjectId id)
{
this.x = x;
this.y = y;
this.id = id;
}
public abstract void tick(LinkedList<GameObject> object);
public abstract void render(Graphics g);
public abstract Rectangle getBounds();
public float getX()
{
return x;
}
public float getY()
{
return y;
}
public void setX(float x)
{
this.x = x;
}
public void setY(float y)
{
this.y = y;
}
public float getVelX()
{
return velX;
}
public float getVelY()
{
return velY;
}
public void setVelX(float velX)
{
this.velX = x;
}
public void setVelY(float velY)
{
this.velY = y;
}
public boolean isFalling() {
return falling;
}
public void setFalling(boolean falling) {
this.falling = falling;
}
public boolean isJumping() {
return jumping;
}
public void setJumping(boolean jumping) {
this.jumping = jumping;
}
public ObjectId getId()
{
return id;
}
}
Game.java：
package com.cosmicluck.miner.window;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;
import java.util.Random;
import com.cosmicluc.miner.framework.KeyInput;
import com.cosmicluc.miner.framework.ObjectId;
import com.cosmicluc.miner.objects.Player;
public class Game extends Canvas implements Runnable
{
private static final long serialVersionUID = -905290418752159869L;
private boolean running = false;
private Thread thread;
public static int WIDTH, HEIGHT;
//Object
Handler handler;
Random rand = new Random();
private void init()
{
WIDTH = getWidth();
HEIGHT = getHeight();
handler = new Handler();
handler.addObject(new Player(100, 100, handler, ObjectId.Player));
handler.createLevel();
this.addKeyListener(new KeyInput(handler));
}
public synchronized void start(){
if(running)
return;
running = true;
thread = new Thread(this);
thread.start();
}
public void run()
{
init();
this.requestFocus();
long lastTime = System.nanoTime();
double amountOfTicks = 60.0;
double ns = 1000000000/amountOfTicks;
double delta = 0;
long timer = System.currentTimeMillis();
int updates = 0;
int frames = 0;
while(running){
long now = System.nanoTime();
delta += (now - lastTime)/ns;
lastTime = now;
while(delta >= 1){
tick();
updates++;
delta--;
}
render();
frames++;
if(System.currentTimeMillis() - timer > 1000){
timer += 1000;
System.out.println("FPS: " + frames + " TICKS: " + updates);
frames = 0;
updates = 0;
}
}
}
private void tick()
{
handler.tick();
}
private void render()
{
BufferStrategy bs = this.getBufferStrategy();
if(bs == null)
{
this.createBufferStrategy(3);
return;
}
Graphics g = bs.getDrawGraphics();
////////////////////////////////////
//Draw here
g.setColor(Color.BLACK);
g.fillRect(0, 0, getWidth(), getHeight());
handler.render(g);
////////////////////////////////////
g.dispose();
bs.show();
}
public static void main(String args[])
{
new Window(800, 600, "Miner Madness - Prototype", new Game());
}
}
謝謝你提前！
編輯：固定！ 我在製作velX/velY = x，y時，在我的GameObject中出現了一個愚蠢的錯誤。謝謝大家的幫助！ :)
調用tick方法的代碼在哪裏？爲什麼tick方法有參數'LinkedList object'？ –
動畫這個代碼在'GameObject'中嗎？是來自'GameObject tempObject = handler.object.get（i）的返回對象;'始終是相同的引用？ –
@hoyah_hayoh tick方法在我的主Game.java類中被調用，並且通過讓LinkedList一次調用每個遊戲對象。和皮膚持票人，我剛剛在我的帖子中添加了GameObject代碼。 – Cosmicluck