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<?php
/* vim: set expandtab tabstop=4 shiftwidth=4 softtabstop=4: */
/**
* Image_Canvas
*
* Canvas based creation of images to facilitate different output formats
*
* PHP versions 4 and 5
*
* LICENSE: This library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version. This library is distributed in the hope that it
* will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
* General Public License for more details. You should have received a copy of
* the GNU Lesser General Public License along with this library; if not, see
* <http://www.gnu.org/licenses/>
*
* @category Images
* @package Image_Canvas
* @author Jesper Veggerby <pear.nosey@veggerby.dk>
* @author Stefan Neufeind <pear.neufeind@speedpartner.de>
* @copyright 2003-2009 The PHP Group
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @version SVN: $Id$
* @link http://pear.php.net/package/Image_Canvas
*/
/**
* This class contains a set of tool-functions.
*
* These functions are all to be called statically
*
* @category Images
* @package Image_Canvas
* @author Jesper Veggerby <pear.nosey@veggerby.dk>
* @author Stefan Neufeind <pear.neufeind@speedpartner.de>
* @copyright 2003-2009 The PHP Group
* @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
* @version Release: @package_version@
* @link http://pear.php.net/package/Image_Canvas
* @abstract
*/
class Image_Canvas_Tool
{
/**
* Maps a font name to an actual font file (fx. a .ttf file)
*
* Used to translate names (i.e. 'Courier New' to 'cour.ttf' or
* '/Windows/Fonts/Cour.ttf')
*
* Font names are translated using the tab-separated file
* Image/Canvas/Tool/fontmap.txt.
*
* The translated font-name (or the original if no translation) exists is
* then returned if it is an existing file, otherwise the file is searched
* first in the path specified by IMAGE_CANVAS_SYSTEM_FONT_PATH defined in
* Image/Canvas.php, then in the Image/Canvas/Fonts folder. If a font is
* still not found and the name is not beginning with a '/' the search is
* left to the library, otherwise the font is deemed non-existing.
*
* @param string $name The name of the font
* @param string $type The needed file type of the font
*
* @return string The filename of the font
* @static
*/
function fontMap($name, $type = '.ttf')
{
static $_fontMap;
if (!is_array($_fontMap)) {
if (file_exists($fontmap = (dirname(__FILE__) . '/Fonts/fontmap.txt'))) {
$file = file($fontmap);
foreach ($file as $fontmapping) {
list($fontname, $filenames) = explode(',', $fontmapping, 2);
$fontname = trim($fontname);
$filenames = trim($filenames);
$filenames = explode(',', $filenames);
foreach ($filenames as $filename) {
$type_pos = strrpos($filename, '.');
$type = substr($filename, $type_pos);
$_fontMap[$fontname][$type] = $filename;
}
}
}
}
$type = strtolower($type);
if ((isset($_fontMap[$name])) && (isset($_fontMap[$name][$type]))) {
$filename = $_fontMap[$name][$type];
} else {
$filename = $name;
}
if (substr($filename, -strlen($type)) !== $type) {
$filename .= $type;
}
$result = false;
if (file_exists($filename)) {
$result = $filename;
} elseif (file_exists($file = (IMAGE_CANVAS_SYSTEM_FONT_PATH . $filename))) {
$result = $file;
} elseif (file_exists($file = (dirname(__FILE__) . '/Fonts/' . $filename))) {
$result = $file;
} elseif (substr($name, 0, 1) !== '/') {
// leave it to the library to find the font
$result = $name;
}
return str_replace('\\', '/', $result);
}
/**
* Return the average of 2 points
*
* @param double $p1 1st point
* @param double $p2 2nd point
*
* @return double The average of P1 and P2
* @static
*/
function mid($p1, $p2)
{
return ($p1 + $p2) / 2;
}
/**
* Mirrors P1 in P2 by a amount of Factor
*
* @param double $p1 1st point, point to mirror
* @param double $p2 2nd point, mirror point
* @param double $factor Mirror factor, 0 returns $p2, 1 returns a pure
* mirror, ie $p1 on the exact other side of $p2
*
* @return double $p1 mirrored in $p2 by Factor
* @static
*/
function mirror($p1, $p2, $factor = 1)
{
return $p2 + $factor * ($p2 - $p1);
}
/**
* Calculates a Bezier control point, this function must be called for BOTH
* X and Y coordinates (will it work for 3D coordinates!?)
*
* @param double $p1 1st point
* @param double $p2 Point to
* @param double $factor ???
* @param double $smoothFactor Smooth factor (???)
*
* @return double P1 mirrored in P2 by Factor
* @static
*/
function controlPoint($p1, $p2, $factor, $smoothFactor = 0.75)
{
$sa = Image_Canvas_Tool::mirror($p1, $p2, $smoothFactor);
$sb = Image_Canvas_Tool::mid($p2, $sa);
$m = Image_Canvas_Tool::mid($p2, $factor);
$pC = Image_Canvas_Tool::mid($sb, $m);
return $pC;
}
/**
* Calculates a Bezier point, this function must be called for BOTH X and Y
* coordinates (will it work for 3D coordinates!?)
*
* @param double $t A position between $p2 and $p3, value between 0 and 1
* @param double $p1 Point to use for calculating control points
* @param double $p2 Point 1 to calculate bezier curve between
* @param double $p3 Point 2 to calculate bezier curve between
* @param double $p4 Point to use for calculating control points
*
* @return double The bezier value of the point t between $p2 and $p3 using
* $p1 and $p4 to calculate control points
* @static
*/
function bezier($t, $p1, $p2, $p3, $p4)
{
// (1-t)^3*p1 + 3*(1-t)^2*t*p2 + 3*(1-t)*t^2*p3 + t^3*p4
return pow(1 - $t, 3) * $p1 +
3 * pow(1 - $t, 2) * $t * $p2 +
3 * (1 - $t) * pow($t, 2) * $p3 +
pow($t, 3) * $p4;
}
/**
* Gets the angle / slope of a line relative to horizontal (left -> right)
*
* @param double $x0 The starting x point
* @param double $y0 The starting y point
* @param double $x1 The ending x point
* @param double $y1 The ending y point
*
* @return double The angle in degrees of the line
* @static
*/
function getAngle($x0, $y0, $x1, $y1)
{
$dx = ($x1 - $x0);
$dy = ($y1 - $y0);
$l = sqrt($dx * $dx + $dy * $dy);
$v = rad2deg(asin(($y0 - $y1) / $l));
if ($dx < 0) {
$v = 180 - $v;
}
return $v;
}
}
?>
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