MultiTouchController.pde

class MultiTouchController{//Used to process the android API touch events for easy use by applications
   ArrayList <MultiTouch> mTContainer;//Container for MultiTouch objects
   //http://wiki.processing.org/w/Android
   MultiTouchController(int num){
      mTContainer=new ArrayList<MultiTouch>(num);
      for(int i=0;i<num;i++){
        mTContainer.add(new MultiTouch()); 
      }
   }
     MultiTouchController(){
      mTContainer=new ArrayList<MultiTouch>();
     // for(int i=0;i<num;i++){
       // mTContainer.add(new MultiTouch()); 
      //}
   }
   public void init(){//Puts disk objects on the screen to be moved around
     for(int i=0;i<4;i++){
      mTContainer.set(i,new MultiTouch(i*100+100,i*100+200,0));
    }
   }
  public void touch(MotionEvent ev, int pointerId){//Method used when a touch event happens
    pt cTouch= new pt(ev.getX(pointerId),ev.getY(pointerId),0);
    if(mTContainer.size()<1){
      mTContainer.add(new MultiTouch(cTouch.x,cTouch.y,0));
    }
    else{
      MultiTouch temp =findClosest(cTouch);
      if(temp!=null){
        temp.selected=true;
        temp.meIndex=pointerId;
        temp.lastTouch=cTouch; //Keep track of the touch location for movement
       }
    }
 
  }
  public void lift(int pointerId){//Used when a finger is lifted
    MultiTouch temp=null;
    for(int i=0;i<mTContainer.size();i++){//iterate through the multiTouch Container object
      temp=mTContainer.get(i); 
      if(temp.meIndex==pointerId){
          temp.selected=false;
          temp.meIndex=-1;
      }
    }
  // smoothing=true; sfairInit(); fstp=0; 
  }
  public MultiTouch findClosest(pt aa){//Returns the index of the closest disk of the container to the 
    float minDistance= Float.MAX_VALUE;
    MultiTouch closest=null;
    for(MultiTouch mt: mTContainer){
      float d= mt.disk.disTo(aa);
      if(d<minDistance&&!mt.selected){
        minDistance=d;
        closest=mt; 
      }
    }
    return closest; 
  }
  public void motion(MotionEvent me){//Used when a finger moves on the screen
    MultiTouch temp=null;
    for(int i=0;i<me.getPointerCount();i++){
      int j=me.getPointerId(i);
      int index=indexOf(j);
        if(index!=-1 && mTContainer.get(index).selected){
          temp=mTContainer.get(index);
          //log the current position of the users fingers
          temp.currentTouch= new pt(me.getX(i),me.getY(i),0);
          //calculate the distance moved from the previous frame and move the point
          temp.disk.move(temp.currentTouch.subtract(temp.lastTouch));
          temp.lastTouch.set(temp.currentTouch);
        }
    }
  }  
  void draw(){//Draws the disks  
    int num=0;
    for(int i=0;i<mTContainer.size();i++){
      mTContainer.get(i).draw(); 
    }
  }
  String toString(){
    String ret="";
    for(int i=0;i<mTContainer.size();i++){ 
      ret+="Multitouch: "+mTContainer.get(i);
      ret+="\n";
    }
    return ret;
  }
  int indexOf(int pointerId){
    for(int i=0;i<mTContainer.size();i++){
      if(mTContainer.get(i).meIndex==pointerId&&mTContainer.get(i).selected){
        return i; 
      }  
    }
    return -1;
  } 
}