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I've created a very simple program where I drew a maze using paint (the method fillRect was used to create the walls of the maze), and I've created a sprite that is moved using keyListener. I want to implement a simple (as I'm in my first year of commuter science) collision detection to keep the sprite from moving through the walls of the maze. Because the maze is drawn in almost 400 lines of code, I won't include it.

import java.awt.*;
import java.applet.*;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;

public class IndeProj extends Applet implements KeyListener {


    //KEY LISTENER INFO FOR MY SPRITE
    public int x = 10;
    public int y = 575;
    public boolean keyUp;  
    public boolean keyDown;  
    public boolean keyLeft;  
    public boolean keyRight;


    public void paint(Graphics g) {
        //drawMaze
        drawMazeHorizontalLines(g);
        drawMazeVerticalLines(g);

        //SPRITE STUFF
        addKeyListener(this);
        this.MoveRect(g,x,y);

    }

    public void drawMazeHorizontalLines(Graphics g)
    {
        //This method draws the horizontal lines of the maze using the method `fillRect(x,y,w,h)`
    }

    public void drawMazeVerticalLines (Graphics g)
    {
        //This method draws the vertical lines of the maze using `fillRect(x,y,w,h)`
    }


    public void MoveRect(Graphics g, int x, int y) //Draws Sprite   
    {
        g.setColor(Color.green);
        g.fillRect(x,y,20,20);
        g.setColor(Color.yellow); //Sprite body
        g.fillRect(x,y,20,20);
        g.setColor(Color.green); //Sprite eyes
        g.fillRect(x,y,7,7);
        g.fillRect((x+13),y,7,7);
        g.setColor(Color.blue); //Sprite pants
        g.fillRect(x,(y+13),20,7);
        g.setColor(Color.black); //Sprite mouth
        g.fillRect((x+6),(y+9),8,2);
    }

    public void keyPressed(KeyEvent e) //Moves Sprite
    {
        if (e.getKeyCode() == KeyEvent.VK_DOWN) {
            y+=1;
            y+=0;
        } if (e.getKeyCode() == KeyEvent.VK_UP) {
            y-=1;
            y-=0;
        } if (e.getKeyCode() == KeyEvent.VK_LEFT) {
            x-=1;
            x-=0;
        } if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
            x+=1;
            x+=0;
        }
        repaint();
    }
    public void keyReleased(KeyEvent e) //Stops Sprite  
    {   
         keyUp = keyDown = keyLeft = keyRight = false;
    }
}

I want to make it so that the sprite stops when it hits a wall (using x and y coordinates), the sprite will stop moving.

4

3 回答 3

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这是一种简单的碰撞检测方法，地图是一个整数网格，每个整数都有它包含的墙。如果你做错了，你会得到神奇的单向墙。

/* could use enums for this */
public static int WALL_LEFT = 1;
public static int WALL_RIGHT = 2;
public static int WALL_TOP = 4;
public static int WALL_BOTTOM = 8;


public int[][] createSimpleMap(){
    int[][] map = new int[2][2];
    map[0][0] = WALL_LEFT | WALL_RIGHT | WALL_TOP;
    map[0][1] = WALL_LEFT | WALL_RIGHT | WALL_TOP;
    map[1][0] = WALL_LEFT | WALL_BOTTOM;
    map[1][1] = WALL_RIGHT | WALL_BOTTOM;
    return map;
}

要进行碰撞检测，只需检测墙壁是否存在。

public boolean canMoveUp(x,y){
    return (this.map[x][y] & WALL_TOP) ==0;
}
于 2013-03-15T02:26:13.180 回答
0

如果您的小程序是双缓冲的，那么您可以在它们移动之前执行以下操作：

Color c = new Color(buffer.getRGB(desiredPlayerX, desiredPlayerY));
if(c.equals(<Whatever color you used for the maze walls>)){
    // Don't allow the movement of the player
}else{
    x = desiredPlayerX;
    y = desiredPlayerY;
}

这种方法确实看起来有点“hacky”，我确信有更好的方法来实现它，但这是一个可能的快速解决方案。

于 2013-03-15T02:47:29.797 回答
0

我会这样做的方式是使用矩形碰撞盒。playerX 和 playerY 是玩家的坐标：

while(true) {
    while(!((playerX > 50 && playerX < 100) && (playerY > 50 && playerY < 100))){
        //Put code to let they players walk here, and boundaries will be enforced.
    }
}

那将是一个矩形框，您不能进入其边界。

于 2013-03-15T02:41:52.880 回答