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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, write
+ * to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ * 02111-1307 USA
+ *
+ * @category Images
+ * @package Image_Canvas
+ * @author Jesper Veggerby <pear.nosey@veggerby.dk>
+ * @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
+ * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
+ * @version CVS: $Id$
+ * @link http://pear.php.net/pepr/pepr-proposal-show.php?id=212
+ */
+
+/**
+ * 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>
+ * @copyright Copyright (C) 2003, 2004 Jesper Veggerby Hansen
+ * @license http://www.gnu.org/copyleft/lesser.html LGPL License 2.1
+ * @version Release: @package_version@
+ * @link http://pear.php.net/pepr/pepr-proposal-show.php?id=212
+ * @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 $o2 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 $factor Mirror factor, 0 returns P2, 1 returns a pure
+ * mirror, i.e. P1 on the exact other side of P2
+ * @return double P1 mirrored in P2 by Factor
+ * @static
+ */
+ function controlPoint($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 $y1 The ending y point
+ * @param double The angle in degrees of the line
+ * @static
+ */
+ function getAngle($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;
+
+ }
+
+}
+
+?> \ No newline at end of file
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