Windowing System

<?php

class Door
{
    function lock()
    {
        // ...
    }

    function unlock()
    {
        // ...
    }
}

<?php

$a_door = new Door();
$a_door->lock();
$a_door->unlock();

<?php

class Car
{
    public $color;

    function __construct($color)
    {
        $this->color = $color;
    }

    function getColor()
    {
        return $this->color;
    }
}

$a_car = new Car("red");
$a_car->color; // => "red" by accessing the property
$a_car->getColor(); // => "red" by invoking the instance method

Instructions

In this exercise, you will be simulating a windowing based computer system. You will create some windows that can be moved and resized. The following image is representative of the values you will be working with below.

 ╔════════════════════════════════════════════════════════════╗
 ║                                                            ║
 ║        position::$x,_                                      ║
 ║        position::$y  \                                     ║
 ║                       \<---- size::$width ---->            ║
 ║                 ^      *──────────────────────┐            ║
 ║                 |      │        title         │            ║
 ║                 |      ├──────────────────────┤            ║
 ║                 |      │                      │            ║
 ║          size::$height │                      │            ║
 ║                 |      │       contents       │            ║
 ║                 |      │                      │            ║
 ║                 |      │                      │            ║
 ║                 v      └──────────────────────┘            ║
 ║                                                            ║
 ║                                                            ║
 ╚════════════════════════════════════════════════════════════╝

1. Define the properties of the Program Window

Using the provided class scaffold, provide the properties for the x, y, height, and width values.

<?php

$window = new ProgramWindow();
$window->x; // => null
$window->y; // => null
$window->width; // => null
$window->height; // => null

2. Define the initial values for the program window

Define a constructor function for ProgramWindow. It should not take any arguments, but during the constructor execution set the default values for its properties. It should set the initial x and y values to 0. It should set the initial width and height to an 800x600 screen size.

<?php

$window = new ProgramWindow();
$window->x; // => 0 
$window->y; // => 0
$window->width; // => 800
$window->height; // => 600

3. Define a function to resize the window

Define a new class in Size.php for a Size class. It should take constructor arguments to set an height and width property. Additionally ProgramWindow requires a resize function, which receives the Size object instance and updates its own properties.

<?php 

$window = new ProgramWindow();
$size = new Size(764, 1080);
$window->resize($size)

$window->height;
// => 764
$window->width;
// => 1080

4. Define a function to move the window

Define a new class in Position.php for a Position class. It should take constructor arguments to set a y and x property. Additionally ProgramWindow requires a move function, which receives the Position object instance and updates its own properties.

<?php 

$window = new ProgramWindow();
$position = new Position(80, 313);
$window->move($position)

$window->y;
// => 80
$window->x;
// => 313