hi guy's
I have a problem, maybe someone can help me.
I have made an ellipse who slide on an arc with a tcur fonction in Tuio library
but it work with the height of the screen but I want to work with the height of de fiducial
How can I do this

thanks for your response

this is the code

1. void Tobject()
   {
     float obj_size = object_size*scale_factor;
    
     Vector tuioObjectList = tuioClient.getTuioObjects();
     for (int i=0;i<tuioObjectList.size();i++) {
        TuioObject tobj = (TuioObject)tuioObjectList.elementAt(i);
     
        noStroke();
        if (+tobj.getSymbolID() == 0)
        {
          pushMatrix();
          float a = map(tobj.getAngle(),0,6.30,1.5,4.8);
        
          fill (0,0,255,100);
         translate(tobj.getScreenX(width),tobj.getScreenY(height));
         ypos = tobj.getY();
          pushStyle();
            noFill();
            stroke(255,255,255,130);
            strokeWeight(4);
            strokeCap(ROUND);
           
              arc(-obj_size/2+18,-obj_size/2+18,70,70,1.5,4.8);
              arc(-obj_size/2+18,-obj_size/2+18,70,70,1.5,(a)%4.8);
              pushStyle();
              gain();
             
              popStyle();
         
          arc(-obj_size/2+18,-obj_size/2+18,70,70,5.5,7);
             pushStyle();
             noStroke();
             fill(255,255,255,130);
             ellipse(-obj_size/2+34,-obj_size/2+50,15,15);
             popStyle();
               
          popStyle();
          rotate(tobj.getAngle());
          bezierRect(-obj_size/2,-obj_size/2,obj_size,obj_size,2,2);
        
   
          popMatrix();
            println(ypos);
          }
        }
   }
   void bezierRect(float x, float y, float w, float h, float xr, float yr) {
    float w2=w/2f, h2=h/2f, cx=x+w2, cy=y+h2;
    beginShape();
    vertex(cx,cy-h2);
    bezierVertex(cx+w2-xr, cy-h2, cx+w2, cy-h2+yr, cx+w2, cy);
    bezierVertex(cx+w2, cy+h2-yr, cx+w2-xr, cy+h2, cx, cy+h2);
    bezierVertex(cx-w2+xr, cy+h2, cx-w2, cy+h2-yr, cx-w2, cy);
    bezierVertex(cx-w2, cy-h2+yr, cx-w2+xr, cy-h2, cx, cy-h2);
    endShape();
   }
   
   void octogone()  {
     float obj_size = object_size*scale_factor;
     rect(-obj_size/2,-obj_size/2,obj_size,obj_size);
     rotate(PI/4.0);
     rect(-obj_size/2,-obj_size/2,obj_size,obj_size);
   }
   
   void gain() {
     float obj_size = object_size*scale_factor;
     fill(255,255,255,230);
     noStroke();
     float X = SIZE / 2 * cos(angle);
     float Y = SIZE / 2 * sin(angle);
     circleX = obj_size-38.5+X;
     circleY = obj_size-39+Y;
    ellipse(circleX, circleY, SIZE / 5, SIZE / 5);  
    
   
    Vector tuioCursorList = tuioClient.getTuioCursors();
      for (int m=0;m<tuioCursorList.size();m++) {
         TuioCursor tcur = (TuioCursor)tuioCursorList.elementAt(m);
     
   
         angle = tcur.getY();
         angle = map(angle,0,1.0,-0.7,0.6);
         angle = constrain(angle,-0.7,0.6);
      
   }}