我有一个显示在屏幕上的图像，并且在同一个类中我添加了一个KeyListener，所以当我按下它们时会识别键，因为我添加了print语句来说明是否按下它们以免这是问题。问题是图像不会移动。我不应该在我的Keypressed方法的底部调用重绘方法。我认为应该有一种更新图像的方法，但我不确定如何做到这一点。这是我的代码（我有更多的课程，但我认为他们不需要这个问题）：
package Game;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import javax.swing.JPanel;
import javax.swing.Timer;
/**
* This class is used to paint all the graphics onto the screen
*/
public class Printer extends JPanel implements KeyListener, ActionListener{
private Map map;
private Character ch;
private int scale;
private Point imageP;
private BufferedImage chImage;
private ArrayList<Rectangle> part;
private int x;
private int y;
private int width;
private int height;
private int speed;
/**
* Constructor it initializes all the variables and all the keyListeners
* @param scale1 takes in a scale factor so it can multiply and scale everything else
*/
public Printer(int scale1){
scale = scale1;
map = new Map();
ch = new Character();
imageP = ch.getPoint();
chImage = ch.getImage();
part = map.getPart();
x = imageP.x * scale;
y = imageP.y * scale;
addKeyListener(this);
setFocusable(true);
setFocusTraversalKeysEnabled(false);
width = ch.getWidth();
height = ch.getHeight();
speed = ch.getSpeed();
}
/**
* used to paint all the rectangles and the character
* @param takes in the graphics component to draw objects
*/
protected void paintComponent(Graphics g) {
super.paintComponent(g);
for(int i=0; i<part.size(); i++){
Rectangle temp = new Rectangle(part.get(i));
g.drawRect(temp.x, temp.y, temp.width, temp.height);
g.fillRect(temp.x, temp.y, temp.width, temp.height);
}
g.drawImage(chImage, imageP.x*scale, imageP.y*scale, null);
}
/**
* Moves the character left right up and down based on what keys you press
* @param listens for keyevents to happen from the user
*/
@Override
public void keyPressed(KeyEvent e) {
if(e.getKeyCode() == KeyEvent.VK_S){
imageP.y += 1*speed;
}
switch(e.getKeyCode()){
case KeyEvent.VK_S:
if(imageP.y <= height-33)
imageP.y += 1*speed;
break;
case KeyEvent.VK_W:
if(imageP.y >=0+5)
imageP.y -= 1*speed;
break;
case KeyEvent.VK_A:
if(imageP.x >=0+5)
imageP.x -= 1*speed;
break;
case KeyEvent.VK_D:
if(imageP.x <= width-30)
imageP.x += 1*speed;
break;
}
repaint();
}
@Override
public void keyReleased(KeyEvent e) {
}
@Override
public void keyTyped(KeyEvent e) {
}
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
}
}
package Game;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JPanel;
/**
* Creates a image for a character and allows him to walk around the screen
*/
public class Character extends JPanel{
private BufferedImage image;
private Point imageP;
private int speed;
private int scale;
private int width;
private int height;
/**
* Constructs the basics of a Character with minimal info just mainly used to access these class methods
*/
public Character(){
this(50,50,3,300,169);
}
/**
* Creates a more complex Character that takes in more specific information about placement and scaling
* @param x is the x position on the screen
* @param y is the y position on the screen
* @param scale1 is the scale factor that everything gets multiplied by
* @param w is the width of the characters image
* @param h is the height of the characters image
*/
public Character(int x, int y, int scale1, int w, int h){
super();
try {
image = ImageIO.read(new File("F:\\Programming\\Final Project\\Top_down\\narwhal.png"));
} catch (IOException ex) {
ex.printStackTrace();
}
scale = scale1;
imageP = new Point(x,y);
speed = 10;
width = w;
height = h;
}
/**
* lets other classes access the Point variable
* @return the xy points
*/
public Point getPoint(){
return this.imageP;
}
/**
* lets other classes access the Image variable
* @return the image that is viewed
*/
public BufferedImage getImage(){
return this.image;
}
/**
* changes the image that is sent to other classes
*/
public void setImage(BufferedImage img){
this.image = img;
}
/**
* lets other classes access the speed variable at which the character moves around
* @param the speed that is changed in other classes
*/
public void setSpeed(int speed){
this.speed = speed;
}
/**
* lets other classes access the speed variable
* @return the xy points
*/
public int getSpeed(){
return this.speed;
}
/**
* lets other classes access the width variable
* @return the width of the image
*/
public int getWidth(){
return width;
}
/**
* lets other classes access the height variable
* @return the height of the image
*/
public int getHeight(){
return height;
}
}
答案 0 :(得分：0)
您在x，y处绘制图像。但是你增加了imageP.x和imageP.y。它是哪一个？