Player TIleMap Collision Example

The code is messy since I just wanted to finish this example. There are better ways of doing the collision with the map and there are a lot of lines that can be saved from the code below. But it works.





Press the mouse in the applet to activate it and then use the cursor keys left and right to move and the space bar to jump.

This is the source code of the applet.

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

public class PlayerTileMapCollision extends Applet implements Runnable {
    Graphics bufferGraphics;
  Image offscreen;
  Graphics bufferLevel;
  Image levelgraphic;
 Image image2;
 private double mouseX;
 private double mouseY;
 private boolean playerMoveRight = false;
 private boolean playerMoveLeft = false;
    private double xpos=100;
    private double ypos=100;
    private int radius;
    private int appletSize_x;
    private int appletSize_y;
    private double time;
    private double height;
    private final int GRAVITY = -10;
    private boolean isFalling = true;
  private boolean isJumping = false;


  final short map[] ={
        1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
        1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
        1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
       1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
        1,0,0,0,0,0,0,1,1,1,1,0,0,0,0,0,0,0,0,1,
        1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
        1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,1,1,1,
        1,1,1,1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
        1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
        1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
        1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,
        1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,
        };

    public void init() {


        radius = 10;
        height = appletSize_y - ypos;
        time = 0;
        appletSize_x = getSize().width;
        appletSize_y = getSize().height;
        height=appletSize_y - ypos;
    setBackground(Color.black);
    offscreen = createImage(getSize().width,getSize().height);
    bufferGraphics = offscreen.getGraphics();
        levelgraphic = createImage(getSize().width,getSize().height);
        bufferLevel = levelgraphic.getGraphics();

     image2 = createImage(16,16);
     Graphics test = image2.getGraphics();
     test.setColor(Color.red);
     test.fillRect(0,0,16,16);
     test.setColor(Color.black);
     test.drawRect(0,0,16,16);

        new Thread(this).start();

   // Here the map is drawn
    int n=0;
    for(int y=0;y<=11;y++){
    for(int x=0;x<=19;x++){
      if(map[n]==1) bufferLevel.drawImage(image2,x*16,y*16,this);
      n++;
    }
    }

    }

    public void run() {
  int pos;
  short ch;
  int val;
        for(;;) { // animation loop never ends
      pos = (int)((xpos+8)/16)+20*(int)((ypos+16)/16);
         ch = map[pos];
         if(ch==0 && isJumping==false)isFalling=true;
            if (isJumping) {
       pos = (int)((xpos+8)/16)+20*(int)((ypos-1)/16);
          ch = map[pos];
                if((height - radius < getSize().height) && (ch==0) && (time<1.7)) {
                height =  height - (.2 * GRAVITY * (time * time) );
                  ypos = appletSize_y - height;
                  time += .02;
                } else {
                  isJumping = false;
                  isFalling = true;
                  time=0;
                }
            }

            if (isFalling) {
        pos = (int)(xpos/16)+20*(int)((ypos+16)/16);
          ch = map[pos];
                if(ch==0){
                    height =  height + (.5 * GRAVITY * (time * time) );
                    ypos = appletSize_y - height;
                    time += .02;
                } else {
                    isFalling = false;
                    val=(int)ypos/16;
                    ypos=val*16;
                    time = 0;
             }
            }

   if(playerMoveLeft){
        pos = (int)((xpos-1)/16)+20*(int)((ypos)/16);
          ch = map[pos];
    if(ch==0)
    {
      xpos--;
    }
   }
   if(playerMoveRight){
        pos = (int)((xpos+16)/16)+20*(int)((ypos)/16);
          ch = map[pos];
          if(ch==0) xpos++;
   }

            repaint();
            try {
                Thread.sleep(10);
            } catch (InterruptedException e) {
            }
        }
    }

 public void update (Graphics g)
 {
    bufferGraphics.clearRect(0, 0, getSize().width,getSize().height);
     bufferGraphics.drawImage(levelgraphic,0,0,this);
        bufferGraphics.setColor (Color.RED);
        bufferGraphics.drawString("Jump Example - Press Spacebar to Jump",10,10);
        int x = (int) xpos;
        int y = (int) ypos;
        bufferGraphics.fillOval (x, y, 2 * radius, 2 * radius);
    g.drawImage(offscreen,0,0,this);

 }

    //Overriding the paint method
    public void paint(Graphics g) {
    }

 public boolean mouseMove(Event e, int x, int y)
 {
  mouseX = x;
  mouseY = y;

  return true;
 }

 public boolean keyUp (Event e, int key){
  if(key==Event.LEFT)
        {
         playerMoveLeft = false;
        }
        if(key==Event.RIGHT)
        {
         playerMoveRight = false;
        }
  return true;
 }

 public boolean keyDown (Event e, int key){

  if(key==Event.LEFT)
        {
         playerMoveLeft = true;
   //System.out.println (movingLeft);
        }
        if(key==Event.RIGHT)
        {
         playerMoveRight = true;
        }

     if(key==32)
     {
      if(isFalling==false && isJumping==false)  {
          height = appletSize_y - ypos;
       isJumping = true;
       time=1;
      }
     }
        //System.out.println ("Charakter: " + (char)key + " Integer Value: " + key);
        return true;
 }

}