使用 PHP 5.0创建图形的巧妙方法

 
<?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( $ge->getGraphicObject(), 
      $this->sx, $this->sy, 
      $this->ex, $this->ey, 
      $ge->getColor( $this->color ) ); 
  } 
} 
?>