Android Open Source - Space.Sprint Physics Engine

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Back to project page Space.Sprint.
License

The source code is released under:
GNU General Public License
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Java Source Code

package com.obisapps.spacerun;
/* www .  j  a va2  s. c o  m*/
import android.graphics.Canvas;

public class PhysicsEngine {
  
  
  private LevelCharacter levelCharacter;
  
  
  private int getRectIndex; 
  
  private int jumpHeight = 10;
  private int jumpSpeed;
  private int jumpGravity = 1;
  private int terminalVelocity = -50;
  
  private long jumpPressTimer;
  private long maxJumpTimeMillis = 500;
  
  private int herpderp;
  
  private int scrollSpeed = 10;
  
  public void init(int pGravity, int pSpeed, LevelCharacter lCharacter) {
    levelCharacter = lCharacter;
    jumpSpeed = 0;
  }
  
  
    
  public boolean onFloor(PlayerCharacter playerCharacter) {
    
    getRectIndex = getActiveRect((playerCharacter.getX()));
  
    if (levelCharacter.levelRects.get(getRectIndex).width() >= 11) {
      
      if (playerCharacter.getY() + playerCharacter.getHeight() == levelCharacter.mapRects.get(getRectIndex).top) {
        
        playerCharacter.setStillJumping(false);
        return true;
        
      } else {
        
        return false;
      }
      
    } else {
      
      return false;
    }
    
    
  }
  
  
  private int getActiveRect(int playerX) {
    
    for (int u = 0; u <= levelCharacter.totalBlocksBuffer; u++) {
      if (levelCharacter.mapRects.get(u).contains(playerX, levelCharacter.mapRects.get(u).top)) {
        return u;
      }
    }
    return (Integer) null;
    
  }
  
  



  public void update(PlayerCharacter playerCharacter, LevelCharacter lCharacter, Canvas canvas, GameEngine gEngine) {
    
    int getIndex = getActiveRect(playerCharacter.getX() - scrollSpeed);
    
    if (onFloor(playerCharacter) && playerCharacter.isJumping()) {
      
      jumpSpeed = jumpHeight;      
      playerCharacter.setJumping(false);
      playerCharacter.setStillJumping(true);
      jumpPressTimer = System.currentTimeMillis();
      herpderp = scrollSpeed;
      
    } else if ((!onFloor(playerCharacter)) && (!playerCharacter.isJumping()) && (playerCharacter.isStillJumping()) && (gEngine.isJumpPushed()) && (System.currentTimeMillis() - jumpPressTimer < maxJumpTimeMillis)) {
      
      jumpSpeed = jumpHeight;
      herpderp = scrollSpeed;
      
    } else if (onFloor(playerCharacter)) {
      
      jumpSpeed = 0;
      herpderp = scrollSpeed;
      
    } else {
      
      jumpSpeed -= jumpGravity;
      
      if (lCharacter.levelRects.get(getIndex).width() >= 11) {
      if ((lCharacter.mapRects.get(getIndex).top < playerCharacter.getY() + playerCharacter.getHeight() - jumpSpeed) && (lCharacter.mapRects.get(getIndex).bottom > playerCharacter.getY() - jumpSpeed)) {
          if ((lCharacter.mapRects.get(getIndex).left > playerCharacter.getX() + playerCharacter.getWidth()) && (lCharacter.mapRects.get(getIndex).left < playerCharacter.getX() + playerCharacter.getWidth())) {
            herpderp = 0 - scrollSpeed;
          } else {
            jumpSpeed = (playerCharacter.getY() + playerCharacter.getHeight()) - lCharacter.mapRects.get(getIndex).top;
          }
        } else {
          herpderp = scrollSpeed;
        }
      } else {
        
        herpderp = scrollSpeed;
      }
      
      
    }
    
      
  

    for (int g = 0; g <= lCharacter.getBlocksBuffer(); g++) {
      
      lCharacter.mapRects.get(g).left -= herpderp;
      lCharacter.mapRects.get(g).right -= herpderp;
      
      lCharacter.mapRects.get(g).top += jumpSpeed;
      lCharacter.mapRects.get(g).bottom += jumpSpeed;
    }
    

    //derp
    if (jumpSpeed <= terminalVelocity) {
      
      playerCharacter.setY(playerCharacter.getY() + 10);
      
      if (jumpSpeed<= (terminalVelocity - 50)) {
        
        playerCharacter.setDead(true);
        
      }
      
      
    }
    
    
    
  }

  
  
  public void increaseScrollSpeed(int speedIncrement) {
    
    scrollSpeed += speedIncrement;
    
  }
  
  public void setScrollSpeed(int setSpeed) {
    
    scrollSpeed = setSpeed;
    
  }
  
  public int getScrollSpeed() {
    
    return scrollSpeed;
  }
  
  
}
Java Source Code List
