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import SimpleOpenNI.*;

SimpleOpenNI  context;
color[] userClr = new color[]{ color(255,0,0),
                                     color(0,255,0),
                                     color(0,0,255),
                                     color(255,255,0),
                                     color(255,0,255),
                                     color(0,255,255)
                                   };
PVector com = new PVector();                                   
PVector com2d = new PVector();                                   


void setup() {
  
  size(640,480);
  
  context = new SimpleOpenNI(this);
  
  if(context.isInit() == false) {
     println("Can't init SimpleOpenNI, maybe the camera is not connected!"); 
     exit();
     return;  
  }
  
  
  context.enableDepth();
  context.enableUser();


  stroke(0,0,255);
  strokeWeight(3);
  smooth();
  
}

void draw() {
  
  background(30);
  
  context.update();
    
  image(context.userImage(), 0, 0, 120, 90);



  // draw the skeleton if it's available
  int[] userList = context.getUsers();
  
  for(int i=0;i<userList.length;i++) {
  
    if(context.isTrackingSkeleton(userList[i])) {
      stroke(userClr[ (userList[i] - 1) % userClr.length ] );
      drawSkeleton(userList[i]);
    }      
      
    // draw the center of mass
    if(context.getCoM(userList[i],com)) {
      context.convertRealWorldToProjective(com,com2d);
      stroke(100,255,0);
      strokeWeight(1);
      beginShape(LINES);
        vertex(com2d.x,com2d.y - 5);
        vertex(com2d.x,com2d.y + 5);

        vertex(com2d.x - 5,com2d.y);
        vertex(com2d.x + 5,com2d.y);
      endShape();
      

      fill(0,255,100);
      text(Integer.toString(userList[i]),com2d.x,com2d.y);
      
      
    }
  }    
}

void drawSkeleton(int userId) {

  // to get the 3d joint data
  /*
  PVector jointPos = new PVector();
  context.getJointPositionSkeleton(userId,SimpleOpenNI.SKEL_NECK,jointPos);
  println(jointPos);
  */
  //
  
  
  context.drawLimb(userId, SimpleOpenNI.SKEL_HEAD, SimpleOpenNI.SKEL_NECK);

  context.drawLimb(userId, SimpleOpenNI.SKEL_NECK, SimpleOpenNI.SKEL_LEFT_SHOULDER);
  context.drawLimb(userId, SimpleOpenNI.SKEL_LEFT_SHOULDER, SimpleOpenNI.SKEL_LEFT_ELBOW);
  context.drawLimb(userId, SimpleOpenNI.SKEL_LEFT_ELBOW, SimpleOpenNI.SKEL_LEFT_HAND);

  context.drawLimb(userId, SimpleOpenNI.SKEL_NECK, SimpleOpenNI.SKEL_RIGHT_SHOULDER);
  context.drawLimb(userId, SimpleOpenNI.SKEL_RIGHT_SHOULDER, SimpleOpenNI.SKEL_RIGHT_ELBOW);
  context.drawLimb(userId, SimpleOpenNI.SKEL_RIGHT_ELBOW, SimpleOpenNI.SKEL_RIGHT_HAND);

  context.drawLimb(userId, SimpleOpenNI.SKEL_LEFT_SHOULDER, SimpleOpenNI.SKEL_TORSO);
  context.drawLimb(userId, SimpleOpenNI.SKEL_RIGHT_SHOULDER, SimpleOpenNI.SKEL_TORSO);

  context.drawLimb(userId, SimpleOpenNI.SKEL_TORSO, SimpleOpenNI.SKEL_LEFT_HIP);
  context.drawLimb(userId, SimpleOpenNI.SKEL_LEFT_HIP, SimpleOpenNI.SKEL_LEFT_KNEE);
  context.drawLimb(userId, SimpleOpenNI.SKEL_LEFT_KNEE, SimpleOpenNI.SKEL_LEFT_FOOT);

  context.drawLimb(userId, SimpleOpenNI.SKEL_TORSO, SimpleOpenNI.SKEL_RIGHT_HIP);
  context.drawLimb(userId, SimpleOpenNI.SKEL_RIGHT_HIP, SimpleOpenNI.SKEL_RIGHT_KNEE);
  context.drawLimb(userId, SimpleOpenNI.SKEL_RIGHT_KNEE, SimpleOpenNI.SKEL_RIGHT_FOOT);  
}

// -----------------------------------------------------------------
// SimpleOpenNI events

void onNewUser(SimpleOpenNI curContext, int userId)
{
  println("onNewUser - userId: " + userId);
  println("\tstart tracking skeleton");
  
  curContext.startTrackingSkeleton(userId);
}

void onLostUser(SimpleOpenNI curContext, int userId)
{
  println("onLostUser - userId: " + userId);
}

void onVisibleUser(SimpleOpenNI curContext, int userId)
{
  //println("onVisibleUser - userId: " + userId);
}


void keyPressed()
{
  switch(key)
  {
  case ' ':
    context.setMirror(!context.mirror());
    break;
  }
}