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admin/compiler/joomla_3/wideimage/Canvas.php
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167
admin/compiler/joomla_3/wideimage/Canvas.php
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<?php
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/**
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* @author Gasper Kozak
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* @copyright 2007-2011
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This file is part of WideImage.
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WideImage is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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WideImage is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with WideImage; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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* @package WideImage
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**/
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/**
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* @package Exceptions
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*/
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class WideImage_NoFontException extends WideImage_Exception {}
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/**
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* @package Exceptions
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*/
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class WideImage_InvalidFontFileException extends WideImage_Exception {}
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/**
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* @package Exceptions
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*/
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class WideImage_InvalidCanvasMethodException extends WideImage_Exception {}
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/**
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* @package WideImage
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*/
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class WideImage_Canvas
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{
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protected $handle = 0;
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protected $image = null;
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protected $font = null;
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/**
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* Creates a canvas object that writes to the image passed as a parameter
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*
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* Shouldn't be used directly, use WideImage_Image::getCanvas() instead.
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*
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* @param WideImage_Image $img Image object
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*/
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function __construct($img)
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{
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$this->handle = $img->getHandle();
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$this->image = $img;
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}
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/**
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* Sets the active font. Can be an instance of
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* WideImage_Font_TTF, WideImage_Font_PS, or WideImage_Font_GDF.
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*
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*
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*
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*
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* @param object $font Font object to set for writeText()
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*/
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function setFont($font)
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{
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$this->font = $font;
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}
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/**
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* Creates and sets the current font
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*
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* The supported font types are: TTF/OTF, PS, and GDF.
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* Font type is detected from the extension. If the $file parameter doesn't have an extension, TTF font is presumed.
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*
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* Note: not all parameters are supported by all fonts.
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*
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* @param string $file Font file name (string)
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* @param int $size Font size (supported for TTF/OTF and PS fonts, ignored for GDF)
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* @param int $color Text color
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* @param int $bgcolor Background color (supported only for PS font, ignored for TTF and PS)
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* @return mixed One of the WideImage_Font_* objects
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*/
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function useFont($file, $size = 12, $color = 0, $bgcolor = null)
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{
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$p = strrpos($file, '.');
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if ($p === false || $p < strlen($file) - 4)
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$ext = 'ttf';
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else
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$ext = strtolower(substr($file, $p + 1));
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if ($ext == 'ttf' || $ext == 'otf')
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$font = new WideImage_Font_TTF($file, $size, $color);
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elseif ($ext == 'ps')
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$font = new WideImage_Font_PS($file, $size, $color, $bgcolor);
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elseif ($ext == 'gdf')
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$font = new WideImage_Font_GDF($file, $color);
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else
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throw new WideImage_InvalidFontFileException("'$file' appears to be an invalid font file.");
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$this->setFont($font);
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return $font;
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}
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/**
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* Write text on the image at specified position
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*
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* You must set a font with a call to WideImage_Canvas::setFont() prior to writing text to the image.
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*
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* Smart coordinates are supported for $x and $y arguments, but currently only for TTF/OTF fonts.
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*
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* Example:
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* <code>
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* $img = WideImage::load('pic.jpg');
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* $canvas = $img->getCanvas();
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* $canvas->useFont('Verdana.ttf', 16, $img->allocateColor(255, 0, 0));
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* $canvas->writeText('right', 'bottom', 'www.website.com');
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* </code>
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*
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* @param int $x Left
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* @param int $y Top
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* @param string $text Text to write
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* @param int $angle The angle, defaults to 0
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*/
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function writeText($x, $y, $text, $angle = 0)
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{
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if ($this->font === null)
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throw new WideImage_NoFontException("Can't write text without a font.");
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$angle = - floatval($angle);
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if ($angle < 0)
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$angle = 360 + $angle;
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$angle = $angle % 360;
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$this->font->writeText($this->image, $x, $y, $text, $angle);
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}
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/**
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* A magic method that allows you to call any PHP function that starts with "image".
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*
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* This is a shortcut to call custom functions on the image handle.
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*
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* Example:
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* <code>
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* $img = WideImage::load('pic.jpg');
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* $canvas = $img->getCanvas();
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* $canvas->filledRect(10, 10, 20, 30, $img->allocateColor(0, 0, 0));
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* $canvas->line(60, 80, 30, 100, $img->allocateColor(255, 0, 0));
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* </code>
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*/
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function __call($method, $params)
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{
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if (function_exists('image' . $method))
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{
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array_unshift($params, $this->handle);
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call_user_func_array('image' . $method, $params);
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}
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else
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throw new WideImage_InvalidCanvasMethodException("Function doesn't exist: image{$method}.");
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}
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}
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