无法绘制 BufferedImage

Question

我有一个播放器class

package game.player;

import java.awt.*;
import javax.imageio.ImageIO; 
import java.awt.Graphics;
import java.net.URL;
import java.awt.event.*;
import java.io.IOException;
import java.awt.image.BufferedImage;
import game.input.InputHandler;
import game.player.Missile;

public class Player{

private BufferedImage sprite;
public int x, y, width, height;
private final double speed = 5.0d;
private Missile missile;

public Player(int x, int y, int width, int height){
    this.x = x;
    this.y = y;
    this.width = width;
    this.height = height;

    try{
        URL url = this.getClass().getResource("ship.png");
        sprite = ImageIO.read(url);
    } catch(IOException e){}
}

public void keyPlayer(double delta, InputHandler i){
    if(i.isKeyDown(KeyEvent.VK_D)){
        if(this.x>=1240) return;
        else this.x+=speed*delta;
    }

    if(i.isKeyDown(KeyEvent.VK_A)){
        if(this.x<=0) return;
        else this.x-=speed*delta;
    }

    if(i.isKeyDown(KeyEvent.VK_SPACE)){
        Missile missile = new Missile(this.x);
    }

}

public void update(InputHandler inputP){
    keyPlayer(2.0, inputP);
    if(missile != null) missile.update(0);
}

public void Draw(Graphics a){
    a.drawImage(sprite,x,y,width,height,null);
    if(missile!=null) a.drawImage(missile.spriteM,missile.x,missile.y,2,6,null);
}

public Rectangle getBounds(){
    return new Rectangle(x,y,width,height);
}
}

和一枚导弹class：

package game.player;

import java.awt.*;
import javax.imageio.ImageIO; 
import java.awt.Graphics;
import java.net.URL;
import java.awt.event.*;
import java.io.IOException;
import java.awt.image.BufferedImage;
import java.util.Timer;
import java.util.TimerTask;

public class Missile{

public BufferedImage spriteM;
public int x;
public int y=504;
private Timer timer2;

public Missile(int x){
    this.x=x;
    this.y=504;
    this.spriteM=spriteM;

    try{
        URL url = this.getClass().getResource("missile.png");
        spriteM = ImageIO.read(url);
    } catch(IOException e){}

    //Draw(game.ShooterGame.bbg);
    System.out.println("Missile launched!");
}

/*public void Draw(){
    g.drawImage(sprite,x,y,2,6,null);
}*/

public void update(int sec){
    System.out.println("Updating missile");
    timer2 = new Timer();
    timer2.schedule(new Move(), sec*1000);
}

class Move extends TimerTask{
    public void run(){
        if(2>1){
            y+=3;
        }
    }
}

}

玩家发射一枚导弹，飞到屏幕上，增加"y"。我的问题是：出于某种原因，导弹没有出现在屏幕上（即使 "Missile launched!" 出现了），我无法弄清楚哪里出了问题。

我在 backBuffer.getGraphics 中使用 JFrame 和 drawImage。我的想法是在 Player class 中绘制导弹，而不是在 Missile class.

中绘制导弹

谢谢。

Answer 1

我的第一个猜测是抛出 IOException 并且图像未加载，或者您应该在 JPanel 或您绘制图形的任何地方安排 repaint() .

你能给我们更多的信息吗？

无法绘制 BufferedImage

Cannot draw a BufferedImage

java

bufferedimage