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// 1. Define classes:

class Leaf {
    float x;
    float y;
    
    Leaf(float x, float y) {
        this.x = x;
        this.y = y;
    }

    void appear() { // method
        move();
        fill(135, 68, 70);
        int size = 10;
        triangle(x, y, 
                 x + size, y + size, 
                 x + size * .8, y - size * 0.6);
    }
    void move() {
        y++;
    }
}

class Building {
    float x;
    float y;
    
    Building(float x, float y) {
        this.x = x;
        this.y = y;
    }
    
    void appear() { //method
        move();
        fill(0, 128, 20);
        rect(x, y - 100, 40, 100);
    }
    void move() {
        // no move here
    }
    
}

class UFO {
    float x;
    float y;
    float vx = 1;
    
    UFO(float x, float y) {
        this.x = x;
        this.y = y;
    }
    
    void appear() { // method
        move();
        fill(255);
        ellipse(x, y, 20, 10);
    }
    void move() {
        x += vx;
        
        if (x < 0 || x > width) {
            vx = -1 * vx;
        }
        
    }
    
}

// 2. Declaring the Global variables:

UFO steve;
UFO ufo2;
UFO ufo3;

Building building1;
Building building2;
Building building3;
Building building4;
Building building5;

Leaf[] leaves = new Leaf[12];

// Setup and Draw:

void setup() {
    size(500, 300);
    // Create the instances:
    steve = new UFO(10, 100);
    ufo2 = new UFO(100, 75);
    ufo3 = new UFO(300, 120);

    building1 = new Building(75, 160);
    building2 = new Building(200, 180);
    building3 = new Building(220, 170);
    building4 = new Building(400, 200);
    building5 = new Building(450, 190);

    for (int i=0; i < leaves.length; i++) {
        leaves[i] = new Leaf(random(500), random(150) + 150);
    }
    /* Same as doing this:
        leaf[0] = new Leaf();
        leaf[1] = new Leaf();
        leaf[2] = new Leaf();
        leaf[3] = new Leaf();
        leaf[4] = new Leaf();
        leaf[5] = new Leaf();
        leaf[6] = new Leaf();
        leaf[7] = new Leaf();
        leaf[8] = new Leaf();
        leaf[9] = new Leaf();
        leaf[10] = new Leaf();
        leaf[11] = new Leaf();
    */
}

void draw() {
    background(0, 0, 200);
    fill(0, 255, 0);
    rect(0, 150, 500, 150);
    building1.appear();
    building2.appear();
    building3.appear();
    building4.appear();
    building5.appear();
    
    for (int i=0; i < leaves.length; i++) {
        leaves[i].appear();
    }

    steve.appear();
    ufo2.appear();
    ufo3.appear();
    
    /* Same as doing this:
        leaf[0].appear();
        leaf[1].appear();
        leaf[2].appear();
        leaf[3].appear();
        leaf[4].appear();
        leaf[5].appear();
        leaf[6].appear();
        leaf[7].appear();
        leaf[8].appear();
        leaf[9].appear();
        leaf[10].appear();
        leaf[11].appear();
    */
    
}
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