InclinedStringDrawer.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 /* $Id: InclinedStringDrawer.class.php 4687 2007-12-09 18:57:18Z voxus $ */
00012 
00016     final class InclinedStringDrawer extends TextDrawer
00017     {
00018         const MAX_ANGLE = 70;
00019         
00023         public function draw($string)
00024         {
00025             $textWidth = $this->getTextWidth($string);
00026             $textHeight = $this->getMaxCharacterHeight();
00027             
00028             if ($textWidth < $this->getTuringImage()->getHeight()) {
00029                 $maxAngle = 45;
00030             } else {
00031                 $maxAngle =
00032                     rad2deg(
00033                         asin(
00034                             ($this->getTuringImage()->getHeight() - $textHeight)
00035                             / $textWidth
00036                         )
00037                     );
00038             }
00039 
00040             $angle = mt_rand(-$maxAngle / 2, $maxAngle / 2);
00041             
00042             if ($angle > self::MAX_ANGLE)
00043                 $angle = self::MAX_ANGLE;
00044             
00045             if ($angle < -self::MAX_ANGLE)
00046                 $angle = -self::MAX_ANGLE;
00047             
00048             if ($this->getTuringImage()->getWidth() > $textWidth) {
00049                 $x = round(
00050                     (
00051                         ($this->getTuringImage()->getWidth() - $textWidth)
00052                         * cos(deg2rad($angle))
00053                     )
00054                     / 2
00055                 );
00056                 
00057                 $y = round(
00058                     (
00059                         ($this->getTuringImage()->getHeight() + $textWidth)
00060                         * sin(deg2rad($angle))
00061                     )
00062                     / 2
00063                     + ($textHeight / 2)
00064                 );
00065 
00066                 for ($i = 0, $length = strlen($string); $i < $length; ++$i) {
00067                     $character = $string[$i];
00068 
00069                     $this->drawCraracter($angle, $x, $y, $character);
00070                     
00071                     $charWidth =
00072                         $this->getStringWidth($character)
00073                         + $this->getSpace();
00074                     
00075                     $y -= $charWidth * sin(deg2rad($angle));
00076                     $x += $charWidth * cos(deg2rad($angle));
00077                 }
00078             } else
00079                 return $this->showError();
00080             
00081             return $this;
00082         }
00083     }
00084 ?>

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