class Handle {
  float x, y;
  float w;
  boolean dragging = false;
  color col;
  String shape; 
  Handle( float x, float y, float sz, color col, String shape  ) {
    this.x = x;
    this.y = y;
    w = sz;
    this.col = col; 
    this.shape = shape;
  }
  void drag() {
    dragging = ( mousePressed && mouseX>x && mouseX<x+w && mouseY>y && mouseY<y+w &&mousePressed
      );
  }
  void display() {

    if (dragging) {
      x = constrain(mouseX, 0, width) - w/2;
      y = constrain(mouseY, 0, height-100) - w/2;
      fill( 255 ,50 , 50);
    }
    else { 
      fill(col);  
    }       
    if (shape == "circle" || shape =="Circle") ellipse(x,y, w,w);
    if (shape == "square" || shape =="Square") rect( x, y, w, w );
  }
}