使用 PHP 5.0创建图形的巧妙方法

 
class GraphicsEnvironment 
{ 
  public $vsx; 
  public $vsy; 
  public $vex; 
  public $vey; 
  public $width; 
  public $height; 
  public $gdo; 
  public $colors = array(); 

  public function __construct( $width, $height, 
    $vsx, $vsy, $vex, $vey ) 
  { 
    $this->vsx = $vsx; 
    $this->vsy = $vsy; 
    $this->vex = $vex; 
    $this->vey = $vey; 
    $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 ); 
  } 
   
  public function tx( $x ) 
  { 
    $r = $this->width / ( $this->vex - $this->vsx ); 
    return ( $x - $this->vsx ) * $r; 
  } 
    
  public function ty( $y ) 
  { 
    $r = $this->height / ( $this->vey - $this->vsy ); 
    return ( $y - $this->vsy ) * $r; 
  } 
} 

 
<?php 
require_once( "glib.php" ); 

$ge = new GraphicsEnvironment( 400, 400, 
   -1000, -1000, 1000, 1000 ); 

$ge->addColor( "black", 0, 0, 0 ); 
$ge->addColor( "red", 255, 0, 0 ); 
$ge->addColor( "green", 0, 255, 0 ); 
$ge->addColor( "blue", 0, 0, 255 ); 

$g1 = new Group( 0 ); 
$g1->add( new Oval( 200, "red", -800, -800, 0, 0 ) );   
$g1->add( new Rectangle( 100, "black", -400, -400, 900, 900 ) ); 

$g1->render( $ge ); 

$ge->saveAsPng( "test.png" ); 
?> 

 
$ge = new GraphicsEnvironment( 400, 200, 
  -1000, -1000, 1000, 1000 );