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 
00015     final class InclinedStringDrawer extends TextDrawer
00016     {
00017         const MAX_ANGLE = 70;
00018         
00022         public function draw($string)
00023         {
00024             $textWidth = $this->getTextWidth($string);
00025             $textHeight = $this->getMaxCharacterHeight();
00026             
00027             if ($textWidth < $this->getTuringImage()->getHeight()) {
00028                 $maxAngle = 45;
00029             } else {
00030                 $maxAngle =
00031                     rad2deg(
00032                         asin(
00033                             ($this->getTuringImage()->getHeight() - $textHeight)
00034                             / $textWidth
00035                         )
00036                     );
00037             }
00038 
00039             $angle = mt_rand(-$maxAngle / 2, $maxAngle / 2);
00040             
00041             if ($angle > self::MAX_ANGLE)
00042                 $angle = self::MAX_ANGLE;
00043             
00044             if ($angle < -self::MAX_ANGLE)
00045                 $angle = -self::MAX_ANGLE;
00046             
00047             if ($this->getTuringImage()->getWidth() > $textWidth) {
00048                 $x = round(
00049                     (
00050                         ($this->getTuringImage()->getWidth() - $textWidth)
00051                         * cos(deg2rad($angle))
00052                     )
00053                     / 2
00054                 );
00055                 
00056                 $y = round(
00057                     (
00058                         ($this->getTuringImage()->getHeight() + $textWidth)
00059                         * sin(deg2rad($angle))
00060                     )
00061                     / 2
00062                     + ($textHeight / 2)
00063                 );
00064 
00065                 for ($i = 0, $length = strlen($string); $i < $length; ++$i) {
00066                     $character = $string[$i];
00067 
00068                     $this->drawCraracter($angle, $x, $y, $character);
00069                     
00070                     $charWidth =
00071                         $this->getStringWidth($character)
00072                         + $this->getSpace();
00073                     
00074                     $y -= $charWidth * sin(deg2rad($angle));
00075                     $x += $charWidth * cos(deg2rad($angle));
00076                 }
00077             } else
00078                 return $this->showError();
00079             
00080             return $this;
00081         }
00082     }
00083 ?>