No puedo resolver esto. Tengo un boceto con pequeños rectángulos giratorios. Giran en cada sorteo (). Sin embargo, el rectángulo anterior permanece visible. Intenté mover el fondo (), pero elimina todos los rectángulos aparte de uno o no borra la pantalla. Me gustaría poder borrar todos los rectángulos después de cada dibujo.

Aquí está el código:

//Create array of objects 
ArrayList<Circle> circles = new ArrayList<Circle>();
ArrayList<Connector> centrePoint = new ArrayList<Connector>();

void setup(){
  size(800, 800);
  frameRate(1);
  rectMode(CENTER);
  background(204);
   for(int i = 1; i < 50; i++){
       float r = random(100,height-100);
       float s = random(100,width-100);
       float t = 20;
       float u = 20;
       println("Print ellipse r and s " + r,s);
       circles.add(new Circle(r,s,t,u,color(14,255,255),random(360),random(5),random(10)));
   }
    //Draw out all the circles from the array
    for(Circle circle : circles){
      circle.draw();
      float connectStartX = circle.x1;
      float connectStartY = circle.y1;
      println("PrintconnectStartX and Y  " + connectStartX,connectStartY);
        for(Circle circleEnd : circles){
          float connectEndX = (circleEnd.x1);
          float connectEndY = (circleEnd.y1);
          centrePoint.add(new Connector(connectStartX,co,nnectStartY,connectEndX,connectEndY));
}
 }

//For each ellipse, add the centre point of the ellipse to array
    for(Connector connectUp : centrePoint){
      println(connectUp.connectStartX ,connectUp.connectStartY ,connectUp.connectEndX ,connectUp.connectEndY);
      stroke(100, 0, 0);
     if (dist(connectUp.connectStartX ,connectUp.connectStartY ,connectUp.connectEndX ,connectUp.connectEndY) < 75){
      connectUp.draw(connectUp.connectStartX ,connectUp.connectStartY ,connectUp.connectEndX ,connectUp.connectEndY);
     }
    }

//For the line weight it should equal the fat of the node it has come from ie
//for each circle, for each connectUp if the x==connectStartX and y==connectStartY then make the line strokeWeight==fat
for(Circle circle : circles){
for(Connector connectUp : centrePoint){

    if (connectUp.connectStartX == circle.x1 & connectUp.connectStartY == circle.y1 & (dist(connectUp.connectStartX ,connectUp.connectStartY ,connectUp.connectEndX ,connectUp.connectEndY) < 75)){
    print(" true "+ circle.fat);
    float authority = circle.fat;
    strokeWeight(authority*1.5);
    connectUp.draw(connectUp.connectStartX ,connectUp.connectStartY ,connectUp.connectEndX ,connectUp.connectEndY);
    }
  }
}
}

void update(){
}
void draw() {
 for(Circle circle : circles){
  circle.rot =+0.02;
  circle.draw();
  circle.rot = random(-6,6);

}
}


//Need to connect each ellipse to all the other ellipses

class Connector {
   public float connectStartX; 
   public float connectStartY;
   public float connectEndX;
   public float connectEndY;
   public color cB;
   public float thickness;

   public Connector(float connectStartX, float connectStartY, float connectEndX, float connectEndY){
      this.connectStartX = connectStartX;
      this.connectStartY = connectStartY;
      this.connectEndX = connectEndX;
      this.connectEndY = connectEndY;
      //this.cB = tempcB;
      //this.thickness = thickness;
   }

void draw(float connectStartX, float connectStartY, float connectEndX, float connectEndY){
     line(connectStartX, connectStartY, connectEndX, connectEndY);
      // float fat = random(255);
       //fill(fat);
       stroke(100, 0, 0);
   }
   }

class Circle{
   public float x1; 
   public float y1;
   public float x2;
   public float y2;
   public color cB;
   public float rot;
   public float fat = random(5);
   public float fert = 0.1;

   public Circle(float x1, float y1, float x2, float y2, color tempcB, float rot, float fat, float fert){
      this.x1 = x1;
      this.y1 = y1;
      this.x2 = x2;
      this.y2 = y2;

      this.cB = tempcB;
      //Tilt - I think this is done in radians
      this.rot = rot;
      //Authority -this is the fill
      this.fat = fat;
      //Fertility- this is a multiplier for the tilt
      this.fert = fert;
   }
   void draw(){   
      pushMatrix();
        translate(x1, y1);
        fert = random(0.5);
        rot = random(-6,6);
        rotate(rot*fert);
        translate(-x1, -y1);
        //float fat = random(255);
        fill(fat);
        rect(x1, y1, 24, 36);
        popMatrix();
   }
}