class Kreis0{
  int xpos, ypos;
  float radius=random(20,70);
  float minRadius = radius * 0.9;
  float maxRadius = radius * 1.1;
  float delta = random(0.1,0.2);
  float gammaBewegungX = random(-1,3);
  float gammaBewegungY = random(-1,3);
  
  float radiushalf = radius/2;

  color paint;
  
    Kreis0(){
      xpos = int(random(width));
      ypos = int(random(height));
      paint = color(random(200),random(255),random(200),120);
    }
    
    void drawKreis(){
      fill(paint);
      ellipse(xpos,ypos,radius,radius);
    }
    
    void breatheKreis(){
      radius += delta;
      if (radius > maxRadius | radius < minRadius)
      delta = -delta;
    }
    
    void bewegen(){
      xpos += gammaBewegungX;
      ypos += gammaBewegungY;
      if(xpos + radiushalf > width | xpos - radiushalf < 0){
        gammaBewegungX = -gammaBewegungX;
      }
      if(ypos + radiushalf > height | ypos - radiushalf < 0){
        gammaBewegungY = -gammaBewegungY;
      }
    }
  //-------
    
    
    
}