使动画与 Java KeyEvent 一起正常工作

Question

我坚持让我的精灵角色通过按d 来执行 2 个动画帧（link_frame_2 后跟 link_frame_1）。它只执行一个动画帧（link_frame_2_face_right.png）。

代码如下：

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，当您移动时，要显示的帧不会更新。如果您使用一组图像并循环播放，那么您将能够在动画中包含任意数字。我已在下面的代码中提供了更新，因此您可以尝试一下。我添加了一个速度，而不是使用您的运动的初始位置，因此您可以独立更改这两个值。此外，缓慢移动可以让您更轻松地看到帧的变化。

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
}