使动画与Java KeyEvent正常工作

Question

通过按d，我坚持让我的精灵字符执行2个动画帧（link_frame_2，后面跟着link_frame_1）。它只执行一个动画帧（link_frame_2_face_right.png）。

下面的代码：

import java.awt.Point; 
import java.awt.event.KeyEvent; 
import java.awt.event.MouseEvent; 

import acm.graphics.GImage; 
import acm.graphics.GPoint; 
import acm.program.GraphicsProgram; 


public class LinkGame extends GraphicsProgram { 

    public void run(){ 
     setSize(APPLICATION_WIDTH, APPLICATION_HEIGHT); 
     addLink(); 
     addKeyListeners(); 
     addMouseListeners(); 
    } 
    private void addLink(){ 
     linkCharacter = new GImage("link sprites/link_frame_1_face_right.png"); 
      add(linkCharacter,link_Location_XCoord,link_Location_YCoord); 
    } 
    public void keyPressed(KeyEvent e){ 
     char linkMoveRightKey = e.getKeyChar(); 
     if(linkMoveRightKey == 'd'){ 
      // y should not change so goku moves in a straight line 
       link_Location_YCoord = 0; 
       linkCharacter.move(link_Location_XCoord,link_Location_YCoord); 
        set_Link_Anim_Frame_2_face_left(); 
      } 
    } 
    public void set_Link_Anim_Frame_2_face_left(){ 
     linkCharacter.setImage("link sprites/link_frame_2_face_right.png");   
    } 
    public void set_Link_Anim_Frame_1_face_left(){ 
     linkCharacter.setImage("link sprites/link_frame_1_face_right.png"); 
    } 
    private GImage linkCharacter; 
    private int link_Location_XCoord = 50; 
    private int link_Location_YCoord = 50 ; 
    private final int APPLICATION_WIDTH = 600; 
    private final int APPLICATION_HEIGHT = 600; 
} 

Answer 1

目前显示未更新哪一帧，当您移动。如果您使用图像阵列并循环播放，那么您将可以在动画中使用任何数字。我在下面的代码中提供了更新，以便您可以试用。我添加了一个速度，而不是使用初始位置进行移动，因此您可以单独更改这两个值。移动速度越慢，您就越容易看到框架的变化。

import java.awt.event.KeyEvent; 

import acm.graphics.GImage; 
import acm.program.GraphicsProgram; 

public class LinkGame extends GraphicsProgram { 

    public void run(){ 
     setSize(APPLICATION_WIDTH, APPLICATION_HEIGHT); 
     addLink(); 
     addKeyListeners(); 
     addMouseListeners(); 
    } 

    private void addLink(){ 
     linkCharacter = new GImage("link sprites/link_frame_1_face_right.png"); 
      add(linkCharacter,link_Location_XCoord,link_Location_YCoord); 
    } 

    public void keyPressed(KeyEvent e){ 
     char linkMoveRightKey = e.getKeyChar(); 
     if(linkMoveRightKey == 'd'){ 
       linkCharacter.move(xSpeed,ySpeed); 
       linkCharacter.setImage(images[frame]); 
       frame++; 
       if(frame>=images.length){ 
        frame = 0; 
       } 
      } 
    } 
    private GImage linkCharacter; 
    private int link_Location_XCoord = 50; 
    private int link_Location_YCoord = 50 ; 
    private final int APPLICATION_WIDTH = 600; 
    private final int APPLICATION_HEIGHT = 600; 
    private String[] images = {"link sprites/link_frame_1_face_right.png","link sprites/link_frame_2_face_right.png"}; //Add in as many images as you want for your animation 
    private int frame = 0; 
    private int xSpeed = 1; //the number of pixels to move in x 
    private int ySpeed = 0; //0 so you only move horizontally 
}