如何修复动画(Java)需要帮助=]

Question

程序检测左右箭头键。如果按下这些键中的任何一个，我的 Knight 对象（GImage 类的实例）将遍历一个字符串数组（这些字符串是我的 Knight 对象动画的目录路径。

我的代码的问题在于，我似乎无法用我想出的java代码找到合适的流畅动画。当我按下箭头键时，动画快速循环，然后减慢速度，但是当我抬起箭头键并再次按下时，它的动画仍然快速循环，然后变慢。

每个运动动画有 4 帧动画。

这是对我正在使用的库的引用http://jtf.acm.org/javadoc/student/acm/graphics/GObject.html#pause%28double%29

任何提示都值得赞赏。

import java.awt.event.KeyEvent;
import acm.graphics.GImage;
import acm.program.GraphicsProgram;

public class Castlevania extends GraphicsProgram {

    public void init(){
        setGameBackground();
        knight = new Knight("knight anim/knightFaceLeft/knight1.png", 500, 500);
        add(knight);
        setSize(APPLICATION_WIDTH, APPLICATION_HEIGHT);
        addKeyListeners();

    }

    private void setGameBackground() {
        // TODO Auto-generated method stub
        gameBackgroundImage = new GImage("link sprites/zelda_background.png");
        add(gameBackgroundImage);
    }

    public void keyPressed(KeyEvent e){ 
        /* Knight's Movement
         * 
         */
        int knightMovementKey = e.getKeyCode();
        if(knightMovementKey == KeyEvent.VK_LEFT)
        {
            this.xSpeed = 10;
            ySpeed = 0;

            knight.setImage(KnightFaceLeft[knightFrame]);
            knight.move(-xSpeed, ySpeed);
            knightFrame ++; 
            if(knightFrame >= KnightFaceLeft.length)
            {
                knightFrame = 0;
            }

        }
        else if(knightMovementKey == KeyEvent.VK_RIGHT){
            knight.setImage(KnightFaceRight[knightFrame]);
            knight.move(xSpeed,ySpeed);
            knightFrame++;
            this.xSpeed = 10;
            ySpeed = 0;
            if(knightFrame>=KnightFaceRight.length){
                knightFrame = 0;
            }
        }
        knight.pause(DELAY);
    }
    private String[] KnightFaceLeft = {"knight anim/knightFaceLeft/knight1.png","knight anim/knightFaceLeft/knight2.png","knight anim/knightFaceLeft/knight3.png","knight anim/knightFaceLeft/knight4.png"}; //Add in as many images as you want for your animation
    private String[] KnightFaceRight = {"knight anim/knightFaceRight/knight1.png","knight anim/knightFaceRight/knight2.png","knight anim/knightFaceRight/knight3.png","knight anim/knightFaceRight/knight4.png"}; 
    private GImage gameBackgroundImage;
    private Knight knight;
    private final int APPLICATION_WIDTH = 1200;
    private final int APPLICATION_HEIGHT = 800;
    private int knightFrame = 0;
    private int xSpeed ; //the number of pixels to move in x
    private int ySpeed = 0; //0 so you only move horiontally
    private double DELAY = 35;
}
import acm.graphics.GImage.*;
public class Knight extends GImage {
                public Knight(String imageDirectory, double knight_Location_XCoord, double knight_Location_YCoord) {
                    super(imageDirectory,knight_Location_XCoord, knight_Location_YCoord);
                }
            }

Answer 1

您对 pause() 的调用正在阻止事件调度线程。在此上下文中，请使用 acm.util.SwingTimer 在计时器的ActionListener中调整动画的节奏。