//class SlowConcentrate{
//
//    float speed;
//    int centerX, centerY, red, green, blue, brushSize, t_init, t_last;
//    boolean accumulate, centerComplete;
//
//    void reset(){
//        centerComplete = false;
//        t_init = millis();
//    }
//
//    SlowConcentrate(int centerX, int centerY){
//
//        this.centerX = centerX;
//        this.centerY = centerY;
//        this.speed = speedSet;
//        this.red = rVal;
//        this.green = gVal;
//        this.blue = bVal;
//        this.brushSize = penWidth;
//
//    }
//
//    void draw(){
//
//    }
//}

int t_circ_shrink_last = 0;
int step = 0;
float radius; 

void shrinkingCircle(float speed, int red, int green, int blue, int borderWidth){
  clearDisplay();
  radius = (screenWidth - menu.width)/calibrator.magx - step;
       
  if (radius > 25){
     if (millis() - t_circ_shrink_last > speed*1000){
        step = step + 1;
        
        noFill();
        strokeWeight(borderWidth);
        stroke(color(red, green, blue));
        ellipseMode(CENTER);
        ellipse(convertXCoord(centerX), convertYCoord(centerY), radius, radius);
        
        t_circ_shrink_last = millis();
     }
  }
}