<?php 

class GraphicsEnvironment 

{ 

  public $width; 

  public $height; 

  public $gdo; 

  public $colors = array(); 

  public function __construct( $width, $height ) 

  { 

    $this->width = $width; 

    $this->height = $height; 

    $this->gdo = imagecreatetruecolor( $width, $height ); 

    $this->addColor( "white", 255, 255, 255 ); 

    imagefilledrectangle( $this->gdo, 0, 0, 

      $width, $height, 

      $this->getColor( "white" ) ); 

  } 

  public function width() { return $this->width; } 

  public function height() { return $this->height; } 

  public function addColor( $name, $r, $g, $b ) 

  { 

    $this->colors[ $name ] = imagecolorallocate( 

      $this->gdo, 

      $r, $g, $b ); 

  } 

  public function getGraphicObject() 

  { 

    return $this->gdo; 

  } 

  public function getColor( $name ) 

  { 

    return $this->colors[ $name ]; 

  } 

  public function saveAsPng( $filename ) 

  { 

    imagepng( $this->gdo, $filename ); 

  } 

} 

abstract class GraphicsObject 

{ 

  abstract public function render( $ge ); 

} 

class Line extends GraphicsObject 

{ 

  private $color; 

  private $sx; 

  private $sy; 

  private $ex; 

  private $ey; 

  public function __construct( $color, $sx, $sy, $ex, $ey ) 

  { 

    $this->color = $color; 

    $this->sx = $sx; 

    $this->sy = $sy; 

    $this->ex = $ex; 

    $this->ey = $ey; 

  } 

  public function render( $ge ) 

  { 

    imageline( $g
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