130 lines
4.2 KiB
PHP
130 lines
4.2 KiB
PHP
<?php
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/*
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php pdf chart generation library
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Copyright (C) Potential Technologies 2002 - 2003
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http://www.potentialtech.com
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program 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 General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: chart.class.php 7 2004-02-11 20:44:53Z gruiick $
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*/
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class chart
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{
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var $colors; // global colors
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var $series; // Array of series
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var $pdf; // reference to the parent class
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function chart()
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{
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$this->clearchart();
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}
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function clearchart()
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{
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// Default colors
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unset($this->colors);
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// This oughta make things more readible
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$white['red'] = $white['green'] = $white['blue'] = 1;
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$black['red'] = $black['green'] = $black['blue'] = 0;
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$this->colors['background'] = $white;
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$this->colors['border'] = $black;
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$this->colors['hlabel'] = $black;
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$this->colors['vlabel'] = $black;
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$this->colors['vgrade'] = $black;
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$this->colors['hgrade'] = $black;
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unset($this->series);
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}
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/* Set up default colors to use globally on the chart
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*/
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function setcolor($name, $red, $green, $blue)
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{
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$this->colors[$name]['red'] = $red;
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$this->colors[$name]['green'] = $green;
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$this->colors[$name]['blue'] = $blue;
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}
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function add_series($name, $points, $color = 'black', $width = 1, $style = 'default')
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{
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$t['points'] = $points;
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$t['color'] = $color;
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$t['width'] = $width;
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$t['style'] = $style;
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$this->series[$name] = $t;
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}
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function place_chart($page, $left, $bottom, $width, $height, $type = 'line')
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{
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switch (strtolower($type)) {
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case 'pie' :
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case '3dpie' :
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case 'bar' :
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case '3dbar' :
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case '3dline' :
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case 'line' :
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default :
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$this->_place_line_chart($page, $left, $bottom, $width, $height);
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}
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}
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function _place_line_chart($page, $left, $bottom, $width, $height)
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{
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// First a filled rectangle to set background color
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$this->_fill_background($page, $left, $bottom, $width, $height);
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// caclulate a scale
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$low = $high = $numx = 0;
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foreach($this->series as $data) {
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foreach($data['points'] as $value) {
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if ($value < $low) $low = $value;
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if ($value > $high) $high = $value;
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}
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if (count($data['points']) > $numx) $numx = count($data);
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}
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if (($high - $low) <= 0) return false;
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$xscale = $width / $numx;
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$yscale = $height / ($high - $low);
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foreach($this->series as $data) {
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$a['strokecolor'] = $this->pdf->get_color($data['color']);
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$a['width'] = $data['width'];
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$c = 0;
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unset($x);
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unset($y);
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foreach ($data['points'] as $value) {
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$x[$c] = ($c * $xscale) + $left;
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//echo $x[$c] . " ";
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$y[$c] = (($value - $low) * $yscale) + $bottom;
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//echo $y[$c] . "<br>\n";
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$c++;
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}
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$this->pdf->draw_line($x, $y, $page, $a);
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}
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}
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function _fill_background($page, $left, $bottom, $width, $height)
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{
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$a['fillcolor'] = $this->colors['background'];
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$a['mode'] = 'fill';
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$this->pdf->draw_rectangle($bottom + $height,
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$left,
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$bottom,
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$left + $width,
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$page,
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$a);
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}
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}
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?>
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