class Circle extends Shape {

    // All of the instance variables are inherited from Shape
    
    // add a new instance variable for color
    color c;
    
    // In our constructor for a circle we also need
    // to call the constructor of the parent class 'shape'
    Circle(float x_, float y_, float s_, int c_) {
        super(x_, y_, s_);
        c = c_;
    }
    
    // We'll override the shake method, and add our
    // own bits of code to it. We'll still call the
    // parent shake() method, but we want to modify
    // it a bit
    void shake() {
    
        super.shake();
        s += random(-1, 1);
        s = constrain(s, 5, 100);
    }

    void render() {
    
        ellipseMode(CENTER);
        fill(c);
        noStroke();
        ellipse(x, y, s, s);
    }
}