Interactive Drawing Tool II

sketch112158
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ArrayList<Circle> circles; 
​
void setup(){
​
    size(800, 800);
    // Create an empty array list called circles that stores circle objects.
    circles = new ArrayList<Circle>();
}
​
void draw(){
    background(36, 83, 197);
​
    
     if (circles.size() > 1) {
        for (int i = 1; i < circles.size(); i++) {
            Circle c = circles.get(i);
            Circle cwaffle = circles.get(i-1);
                stroke(36, 83, 197);
                strokeWeight(12);
                line(c.x, c.y, cwaffle.x, cwaffle.y);
                stroke(255);
                strokeWeight(2);
                line(c.x, c.y, cwaffle.x, cwaffle.y);
                
            }
        }
    
​
    // Go through the array and call functions (display and grow) for each object.
    for (int i = 0; i<circles.size(); i++) {
        Circle c = circles.get(i);
        c.displayStroke();
        c.display();
​
    }
  
​
    // When the mouse is pressed, go to the last item in the array and call the grow function
    if (mousePressed) {
        circles.get(circles.size()-1).grow();
    }
}
​
// When the mouse is pressed add a new circle object to the array 'circles'
void mousePressed() {
    circles.add(new Circle());
    // Print the number of objects in the array list
    println(circles.size());
}
​
// Create a class called circle
class Circle {
    int x, y;   
    int previousX, previousY;
    float size;
    // Constructor
    // This runs when you create the object which is why…
    //…you need to set x & y to the mouse position and the size here…
    // and not in your functions.
    Circle() {
        // set x and y to mouseX and mouseY respectively.
        x = mouseX;
        y = mouseY;
    }
​
    // Function that, when called, displays the object
    void display() {
        fill(36, 83, 197);
        stroke(255);
        strokeWeight(2);
        ellipse(x, y, size, size);
    }
​
    void displayStroke() {
        noFill();
        stroke(36, 83, 197);
        strokeWeight(12);
        ellipse(x, y, size, size);
    }
​
    // Fucntion that, when called, sets the size of the circle to the…
    //…distance between the centre of the circle and the position of the mouse.
    void grow() {
        if (mousePressed) {
        size = (dist(x, y, mouseX, mouseY))*2;
        }
    }
}