<?php
interface Drawable
{
public function draw($canvas);
}
class Rectangle implements Drawable
{
protected $x;
protected $y;
protected $width;
protected $height;
protected $borderColor;
public function __construct($x, $y, $width, $height,
$borderColor = array(255, 255, 255))
{
$this->x = $x;
$this->y = $y;
$this->setDimensions($width, $height);
$this->borderColor = $borderColor;
}
public function setDimensions($width, $height)
{
$this->width = $width;
$this->height = $height;
}
public function draw($canvas)
{
list($r, $g, $b) = $this->borderColor;
$color = imagecolorallocate($canvas, $r, $g, $b);
imagerectangle($canvas, $this->x, $this->y,
$this->x + $this->width, $this->y + $this->height, $color);
}
}
class Square extends Rectangle
{
public function setDimensions($width, $height)
{
if ($width !== $height) {
throw new Exception('Width and height are not equal');
}
parent::setDimensions($width, $height);
}
}
class Text implements Drawable
{
protected $x;
protected $y;
protected $text;
protected $font;
public function __construct($x, $y, $text, $font = 'LinLibertine_R')
{
$this->x = $x;
$this->y = $y;
$this->text = $text;
$this->font = $font;
}
public function draw($canvas)
{
$color = imagecolorallocate($canvas, 0, 255, 0);
imagettftext($canvas, 12, 0, $this->x, $this->y, $color, $this->font, $this->text);
}
}
class Scene
{
protected $width;
protected $height;
protected $drawingObjects = array();
public function __construct($width = 640, $height = 480)
{
$this->width = $width;
$this->height = $height;
}
public function addDrawingObject(Drawable $do)
{
$this->drawingObjects[] = $do;
}
public function render()
{
$canvas = imagecreatetruecolor($this->width, $this->height);
foreach ($this->drawingObjects as $do) {
$do->draw($canvas);
}
return $canvas;
}
}
// Set the enviroment variable for GD
putenv('GDFONTPATH=' . realpath('.'));
$scene = new Scene();
$scene->addDrawingObject(new Rectangle(50, 50, 200, 100));
$scene->addDrawingObject(new Square(250, 150, 200, 200, array(255, 0, 0)));
// Folgende Zeile funktioniert nur, wenn LinLibertine_R.ttf im selben
// Verzeichnis existiert
#$scene->addDrawingObject(new Text(100, 400, 'Hallo Welt!', 'LinLibertine_R'));
// Diese Zeile erzeugt einen Fehler, weil das Quadrat nicht quadratisch ist
#$scene->addDrawingObject(new Square(0, 0, 100, 200));
$canvas = $scene->render();
header('Content-Type: image/png');
imagepng($canvas);
