我试图让 Sprite 在摆动的背景图像上移动，但每次我更新位置并重新绘制时，它也会使用图像的先前位置重新绘制。但是我只是想让它在每次按下右箭头时移动 10 个像素。这是控制运动的 Main 类。
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.*;
public class Main extends JFrame implements KeyListener, ActionListener{
private static final long serialVersionUID = 1L;
//Caitlan info
Image caitlanImage = new ImageIcon("Caitlan.png").getImage();
Person caitlan = new Person(caitlanImage, "Caitlan", 50, 200, true);
//Jake info
Image jakeImage = new ImageIcon("Jake.png").getImage();
Person jake = new Person(jakeImage, "Jake", 0, 200, true);
//Level objects
Image granadaBackground = new ImageIcon("Granada Background.jpg").getImage();
Level granada = new Level(granadaBackground, "Granada", new Point(600, 300));
Image elevatorBackground = new ImageIcon("Elevator.png").getImage();
Level elevator = new Level(elevatorBackground, "Elevator", new Point(0,0));
public static void main(String[] args) throws InterruptedException{
new Main();
}
public Main() throws InterruptedException{ //Constructor (only should be called once)
setSize(700,300);
setTitle("Project Anniversary");
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
addKeyListener(this);
}
public void paint(Graphics g){ //Overridden paint method.
if(checkIfLevelDone(granada, caitlan)){
granada.setDone();
}
if(!granada.isDone()){
g.drawImage(granada.getImage(), 0, 0, granadaBackground.getWidth(null), granadaBackground.getHeight(null),null);
g.drawImage(jake.getImage(), jake.getPosX(), jake.getPosY(), jake.getImage().getWidth(null), jake.getImage().getHeight(null),null);
g.drawImage(caitlan.getImage(), caitlan.getPosX(), caitlan.getPosY(), caitlan.getImage().getWidth(null), caitlan.getImage().getHeight(null), null);
}
else if(granada.isDone()){
setSize(300,300);
g.drawImage(elevator.getImage(), 0, 0,
elevator.getImage().getWidth(null), elevator.getImage().getHeight(null),null);
g.drawImage(jake.getImage(), jake.getPosX(), jake.getPosY(),
jake.getImage().getWidth(null), jake.getImage().getHeight(null),null);
g.drawImage(caitlan.getImage(), caitlan.getPosX(), caitlan.getPosY(),
caitlan.getImage().getWidth(null), caitlan.getImage().getHeight(null), null);
}
}
public void keyPressed(KeyEvent e) { //Method called whenever a key is pressed
caitlan.printLocation();
int code = e.getKeyCode();
if(code == KeyEvent.VK_RIGHT){ //When the user presses the right arrow
caitlan.setLocation(caitlan.getPosX() + 10, caitlan.getPosY());
repaint();
}
if(code == KeyEvent.VK_LEFT){ //When the user presses the left arrow
caitlan.setLocation(caitlan.getPosX() - 10, caitlan.getPosY());
repaint();
}
if(code == KeyEvent.VK_UP){ //Implement jumping code here
repaint();
}
}
public boolean checkIfLevelDone(Level l, Person p){
//Method to check if a given level is done
if(l.getCompletionPoint().x <= p.getPosX()){
return true;
}
return false;
}
public void followOtherPerson(Person a, Person b) throws InterruptedException{
//Method to follow the other character
}
public void jump(Person p) throws InterruptedException{ //Jump method
caitlan.setLocation(caitlan.getPosX(), caitlan.getPosY() - 60);
repaint();
}
public void keyReleased(KeyEvent e) { //IGNORE
}
public void keyTyped(KeyEvent e) { //IGNORE
}
public void actionPerformed(ActionEvent e) { //IGNORE
}
}
这是级别类：
import java.awt.Image;
import java.awt.Point;
public class Level {
//Private attributes
private Image backgroundImage; //Image
private String levelName; //Name of level
private boolean levelComplete; //Status that holds if the level is done
private Point completionPoint; //Point at which the level is completed
public Level(Image i, String l, Point p){ //Constructor
this.backgroundImage = i;
this.levelName = l;
this.completionPoint = p;
levelComplete = false;
}
public void setDone(){
levelComplete = true;
}
public boolean isDone(){ //Returns if the level is done or not
return levelComplete;
}
public Image getImage(){ //Getters and setters
return backgroundImage;
}
public String getLevelName(){
return levelName;
}
public void setImage(Image i){
this.backgroundImage = i;
}
public void setName(String name){
this.levelName = name;
}
public Point getCompletionPoint(){
return completionPoint;
}
public void setCompletionPoint(Point p){
this.completionPoint = p;
}
}
最后，这是 Person 类。
import java.awt.*;
public class Person{
//Attributes
private Image image;
private String name;
private int xlocation;
private int ylocation;
/*Boolean that you can publically access to determine if the given Person object is a
player*/
public boolean isPlayer;
public Person(Image i, String s){ //Really shouldn't be used
this.image = i;
this.name = s;
}
public Person(Image i){ //Really shouldn't be used
this.image = i;
}
public Person(Image i, String s, int xloc, int yloc){ //Basic constructor
this.name = s;
this.image = i;
this.xlocation = xloc;
this.ylocation = yloc;
}
public Person(Image i, String s, int xloc, int yloc, boolean isPlayer){ //Detailed constructor
this.name = s;
this.image = i;
this.xlocation = xloc;
this.ylocation = yloc;
this.isPlayer = isPlayer;
}
public void printLocation(){
System.out.println("Person " + name + " is at location (" + xlocation +", " + ylocation +").");
}
public void incrementPositionX(){ //Increase xlocation by 1
xlocation++;
}
public void incrementPositionY(){ //Increase ylocation by 1
ylocation++;
}
public void setName(String name){ //Method to change the name of a sprite
this.name = name;
}
public void setImage(Image image){ //Method to change the image of a sprite
this.image = image;
}
public Image getImage(){ //Get image
return image;
}
public int getPosX(){ //Get x position
return xlocation;
}
public int getPosY(){ //Get y position
return ylocation;
}
public String getName(){ //Get name
return name;
}
public void setLocation(int x, int y){ //Method to change the location of a sprite
this.xlocation = x;
this.ylocation = y;
}
}