WavesBackgroundDrawer.class.php

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00001 <?php
00002 /***************************************************************************
00003  *   Copyright (C) 2004-2007 by Dmitry E. Demidov                          *
00004  *                                                                         *
00005  *   This program is free software; you can redistribute it and/or modify  *
00006  *   it under the terms of the GNU Lesser General Public License as        *
00007  *   published by the Free Software Foundation; either version 3 of the    *
00008  *   License, or (at your option) any later version.                       *
00009  *                                                                         *
00010  ***************************************************************************/
00011 
00015     final class WavesBackgroundDrawer extends BackgroundDrawer
00016     {
00017         const MIN_WAVE_DISTANCE = 8;
00018         const MAX_WAVE_DISTANCE = 20;
00019         const MAX_WAVE_OFFSET   = 5;
00020         
00024         public function draw()
00025         {
00026             $y = mt_rand(-self::MAX_WAVE_OFFSET, self::MAX_WAVE_OFFSET);
00027             
00028             while ($y < $this->getTuringImage()->getHeight()) {
00029                 $this->drawWave($y);
00030                 
00031                 $y += mt_rand(self::MIN_WAVE_DISTANCE, self::MAX_WAVE_DISTANCE);
00032             }
00033             
00034             return $this;
00035         }
00036         
00037         /* void */ private function drawWave($y)
00038         {
00039             $radius = 5;
00040             $frequency = 30;
00041             
00042             $imageId = $this->getTuringImage()->getImageId();
00043             
00044             for (
00045                 $x = 0, $width = $this->getTuringImage()->getWidth();
00046                 $x < $width;
00047                 ++$x
00048             ) {
00049                 $color = $this->makeColor();
00050                 $colorId = $this->getTuringImage()->getColorIdentifier($color);
00051                 
00052                 $angle = $x % $frequency;
00053                 $angle = 2 * M_PI * $angle / $frequency;
00054                 
00055                 $dy = $radius * sin($angle);
00056                 
00057                 imagesetpixel(
00058                     $imageId,
00059                     $x,
00060                     $y + $dy,
00061                     $colorId
00062                 );
00063             }
00064         }
00065     }
00066 ?>