碰撞检测

Question

我是Java新手，而且我有基本的编程知识。我最近开始开发一个游戏(在教程的帮助下)。这个游戏是一个RPG。它的设置使得玩家的头像始终位于屏幕的中心，但背景会滚动。我知道以前有人问过这个问题，但对我来说没有一个答案是有意义的。基本上，我如何为多个对象创建碰撞检测？我希望它是这样的，这样我的球员在撞到墙时就停止移动。我目前为边界设置了碰撞，但是如何为房屋、墙等设置碰撞？下面是我的代码副本。提前谢谢你。另外，我使用的是Slick2D。

package javagame;

import org.newdawn.slick.*;
import org.newdawn.slick.geom.Rectangle;
import org.newdawn.slick.state.*;
//Need "extends etc." for creating basic screen/state
public class Play extends BasicGameState{

public Rectangle lake1;

Animation avatar, movingUp, movingDown, movingLeft,  movingRight;
Image worldMap;
boolean quit = false;
int[] duration = {200,200};
float avatarPositionX = 0;
float avatarPositionY = 0;
float shiftX = avatarPositionX + 250;
float shiftY = avatarPositionY + 180;

public Play(int state){
}

public void init(GameContainer gc, StateBasedGame sbg) throws SlickException{   
    worldMap = new Image("res/WaterMap.png");
    Image[] walkUp = {new Image("res/CharBack.png"), new 
Image("res/CharBack.png")};
    Image[] walkDown = {new Image("res/CharFront.png"), new 
Image("res/CharFront.png")};
    Image[] walkLeft = {new Image("res/CharLeft.png"), new  
Image("res/CharLeft.png")};
    Image[] walkRight = {new Image("res/CharRight.png"), new
Image("res/CharRight.png")};

    movingUp = new Animation(walkUp, duration, false);
    movingDown = new Animation(walkDown, duration, false);
    movingLeft = new Animation(walkLeft, duration, false);
    movingRight = new Animation(walkRight, duration, false);
    avatar = movingDown;
}
//Takes gc and StateBasedGame and Graphics
public void render(GameContainer gc, StateBasedGame sbg, Graphics g) throws    
SlickException{
    lake1 = new Rectangle(132, 277, 87, 54);
    worldMap.draw(avatarPositionX, avatarPositionY);
    avatar.draw(shiftX, shiftY);
    g.drawString("Your X: "+avatarPositionX+"\nYour Y: "+avatarPositionY, 350,  
20);

    if(quit==true){
        g.drawString("Resume (R)", 200, 100);
        g.drawString("Main Menu (M)", 200, 150);
        g.drawString("Quit (Q)", 200, 200);
        if(quit==false){
            g.clear();
        }
    }
}
//Updates images on screen; creates animation
public void update(GameContainer gc, StateBasedGame sbg, int delta) throws   
SlickException{
    Input input = gc.getInput();
    //up
    if(input.isKeyDown(Input.KEY_UP)){
        avatar = movingUp;
        avatarPositionY += delta * .1f;
        //+= changed to -=
        if(avatarPositionY>180){
            avatarPositionY -= delta * .1f;
        }
    }
    //down
    if(input.isKeyDown(Input.KEY_DOWN)){
        avatar = movingDown;
        avatarPositionY -= delta * .1f;
        if(avatarPositionY<-497){
            avatarPositionY += delta * .1f;
        }
    }
    //left
    if(input.isKeyDown(Input.KEY_LEFT)){
        avatar = movingLeft;
        avatarPositionX += delta * .1f;
        if(avatarPositionX>249){
            avatarPositionX -= delta * .1f;
        }
    }
    //right
    if(input.isKeyDown(Input.KEY_RIGHT)){
        avatar = movingRight;
        avatarPositionX -= delta * .1f;
        if(avatarPositionX<-433){
            avatarPositionX += delta * .1f;
        }
    }
    //escape
    if(input.isKeyDown(Input.KEY_ESCAPE)){
        quit = true;
    }
    //when menu is up
    if(quit == true){
        if(input.isKeyDown(Input.KEY_R)){
            quit = false;
        }
        if(input.isKeyDown(Input.KEY_M)){
            sbg.enterState(0);
        }
        if(input.isKeyDown(Input.KEY_Q)){
            System.exit(0);
        }   
    }
}

public int getID(){
    return 1;
}
}

Answer 1

在你实际移动角色之前，检查下一个位置是否为“空”并且在边界内(你如何实现这取决于你如何实现你的房子和墙)，如果是，只移动角色。

对于实现，您可能希望遍历每个“对象”，并检查字符的新位置是否在其中。