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drawchart.php
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drawchart.php
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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* @package mod_questionnaire
* @copyright 2016 Mike Churchward ([email protected])
* @author Mike Churchward
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
defined('MOODLE_INTERNAL') || die();
function draw_chart($feedbacktype, $charttype=null, $labels,
$score=null, $allscore=null, $globallabel=null, $groupname, $allresponses) {
global $PAGE;
$pageoutput = '';
if ($allresponses) {
$nbvalues = count($allscore);
} else {
$nbvalues = count($score);
}
$nblabels = count($labels);
$charttitlefont = "Verdana";
$charttitlesize = 10;
$charttitlesize2 = 10;
if ($PAGE->pagetype == 'mod-questionnaire-myreport') {
$charttitle = get_string('yourresponse', 'questionnaire');
} else {
$charttitle = get_string('thisresponse', 'questionnaire');
}
$charttitle2 = $groupname;
// Gradient colors if needed.
// TODO make gradient colors customizable in the settings.
$chartcolorsgradient = "['Gradient(white:blue)', 'Gradient(white:red)', 'Gradient(white:green)', 'Gradient(white:pink)',
'Gradient(white:yellow)', 'Gradient(white:cyan)', 'Gradient(white:navy)',
'Gradient(white:gray)', 'Gradient(white:black)']";
// We do not have labels other than global in this feedback type.
if ($feedbacktype == 'global') {
$labels = array($globallabel);
}
switch ($charttype) {
case 'bipolar':
// Global feedback with only one score.
if ($feedbacktype == 'global') {
if ($score) {
if ($allresponses) {
$score = null;
} else {
$score2 = $score;
$score = array($score2[0]);
$oppositescore = array($score2[1]);
}
}
if ($allscore) {
$allscore2 = $allscore;
$allscore = array($allscore2[0]);
$alloppositescore = array($allscore2[1]);
}
$nblabels = 1.5; // For a single horizontal bar with 1.5 height.
$nbvalues = 1; // Only one hbar.
} else {
if ($score) {
$oppositescore = array();
foreach ($score as $sc) {
$oppositescore[] = 100 - $sc;
}
}
if ($allscore) {
$alloppositescore = array();
foreach ($allscore as $sc) {
$alloppositescore[] = 100 - $sc;
}
}
}
foreach ($labels as $key => $label) {
$lb = explode("|", $label);
// Just in case there is no pipe separator in label.
if (count($lb) > 1) {
$left = $lb[0];
$right = $lb[1];
// Lib core_text and diff needed for non-ascii characters.
$lenleft = core_text::strlen($left);
$diffleft = strlen($left) - $lenleft;
$lenright = core_text::strlen($right);
$diffright = strlen($right) - $lenright;
if ($lenleft < $lenright) {
$padlength = $lenright + $diffleft;
$left = str_pad($left, $padlength, ' ', STR_PAD_LEFT);
}
if ($lenleft > $lenright) {
$padlength = $lenleft + $diffright;
$right = str_pad($right, $padlength, ' ', STR_PAD_RIGHT);
}
$labels[$key] = $left .' '.$right;
}
}
// Find length of longest label.
$maxlen = 0;
foreach ($labels as $label) {
$labellen = core_text::strlen($label);
if ($labellen > $maxlen) {
$maxlen = $labellen;
}
}
$labels = json_encode($labels, JSON_UNESCAPED_UNICODE);
// JSON_UNESCAPED_UNICODE available since php 5.4, used to correctly treat French accents etc.
// The bar colors :: use green for "positive" (left column) and pink for "negative" (right column).
$chartcolors = array();
$chartcolors2 = array();
if ($score) {
for ($i = 0; $i < $nbvalues; $i++) {
if ($score[$i] != 0) {
$chartcolors[] = 'lightgreen';
}
}
for ($i = $nbvalues; $i < $nbvalues * 2; $i++) {
$chartcolors[] = 'pink';
}
}
if ($allscore) {
for ($i = 0; $i < $nbvalues; $i++) {
if ($allscore[$i] != 0) {
$chartcolors2[] = 'lightgreen';
}
}
for ($i = $nbvalues; $i < $nbvalues * 2; $i++) {
$chartcolors2[] = 'pink';
}
}
// Encode all arrays for javascript compatibility.
$chartcolors = json_encode($chartcolors);
if ($allscore) {
$chartcolors2 = json_encode($chartcolors2);
}
if ($score) {
$score = json_encode($score);
$oppositescore = json_encode($oppositescore);
}
if ($allscore) {
$allscore = json_encode($allscore);
$alloppositescore = json_encode($alloppositescore);
}
$canvasheight = ($nblabels * 25) + 60;
$canvaswidth = max(300, (100 + ($maxlen * 7)));
if (!$allresponses) {
$pageoutput .= '
<canvas id="cvs" width="'.$canvaswidth.'" height="'.$canvasheight.'">[No canvas support]</canvas>
';
}
if ($allscore) {
$pageoutput .= '
<canvas id="cvs2" width="'.$canvaswidth.'" height="'.$canvasheight.'">[No canvas support]</canvas>
';
}
$pageoutput .= '
<script>
window.onload = function () {';
if (!$allresponses) {
$pageoutput .= '
var chart = new RGraph.Bipolar("cvs", '.$score.', '.$oppositescore.');
chart.Set("chart.title", "'.$charttitle.'");
chart.Set("chart.title.font", "'.$charttitlefont.'");
chart.Set("chart.title.size", "'.$charttitlesize.'");
chart.Set("chart.labels", '.$labels.');
chart.Set("chart.gutter.center", 0);
chart.Set("chart.gutter.left", 10);
chart.Set("chart.gutter.top", 40);
chart.Set("chart.gutter.bottom", 20);
chart.Set("chart.xmax", 100);
chart.Set("chart.text.size", 10);
chart.Set("chart.text.font", "Courier");
chart.Set("chart.colors", '.$chartcolors.');
chart.Set("chart.colors.sequential", true);
chart.Draw();';
}
if ($allscore) {
$pageoutput .= '
var chart = new RGraph.Bipolar("cvs2", '.$allscore.', '.$alloppositescore.');
chart.Set("chart.title", "'.$charttitle2.'");
chart.Set("chart.title.font", "'.$charttitlefont.'");
chart.Set("chart.title.size", "'.$charttitlesize2.'");
chart.Set("chart.labels", '.$labels.');
chart.Set("chart.gutter.center", 0);
chart.Set("chart.gutter.left", 10);
chart.Set("chart.gutter.right", 15);
chart.Set("chart.gutter.top", 40);
chart.Set("chart.gutter.bottom", 20);
chart.Set("chart.xmax", 100);
chart.Set("chart.text.size", 10);
chart.Set("chart.text.font", "Courier");
chart.Set("chart.colors", '.$chartcolors2.');
chart.Set("chart.colors.sequential", true);
chart.Draw();
';
}
$pageoutput .= '
}
</script>
';
break;
case 'hbar':
// The bar colors.
$chartcolors = array();
$chartcolors = json_encode($chartcolors);
$sequential = 'true';
// Global feedback with only one score.
if ($feedbacktype == 'global') {
$lb = explode("|", $globallabel);
// Just in case there is no pipe separator in label.
if (count($lb) > 1) {
$labels = '';
$left = $lb[0];
$right = $lb[1];
$lenleft = core_text::strlen($left);
$lenright = core_text::strlen($right);
if ($lenleft < $lenright) {
$padlength = $lenright;
$left = str_pad($left, $padlength, ' ', STR_PAD_LEFT);
}
if ($lenleft > $lenright) {
$padlength = $lenleft;
$right = str_pad($right, $padlength, ' ', STR_PAD_RIGHT);
}
$labels[0] = $left;
$labels[1] = $right;
}
} else {
if ($nblabels > $nbvalues) {
for ($i = 1; $i < $nblabels - 1; $i++) {
unset($labels[$i]);
}
}
$sequential = 'false';
}
$nblabels = count($labels) + 1;
$score = json_encode($score);
if ($allscore) {
$allscore = json_encode($allscore);
}
// Find length of longest label.
$maxlen = 0;
foreach ($labels as $label) {
$labellen = core_text::strlen($label);
if ($labellen > $maxlen) {
$maxlen = $labellen;
}
}
foreach ($labels as $value) {
$output[] = '"'.$value.'"';
}
$labels = '[' . implode(',', $output) . ']';
$canvasheight = ($nblabels * 20) + 60;
$charttextfont = 'Courier';
$gutterleft = ($maxlen * 8) + 5;
$canvaswidth = 400 + $gutterleft;
if (!$allresponses) {
$pageoutput .= '
<canvas id="cvs" width="'.$canvaswidth.'" height="'.$canvasheight.'">[No canvas support]</canvas>
';
}
if ($allscore) {
$pageoutput .= '
<canvas id="cvs2" width="'.$canvaswidth.'" height="'.$canvasheight.'">[No canvas support]</canvas>
';
}
$pageoutput .= '
<script>
window.onload = function () {';
if (!$allresponses) {
$pageoutput .= '
var chart = new RGraph.HBar("cvs", '.$score.');
chart.Set("chart.title", "'.$charttitle.'");
chart.Set("chart.title.font", "'.$charttitlefont.'");
chart.Set("chart.title.size", "'.$charttitlesize.'");
chart.Set("chart.title.x", 400);
chart.Set("gutter.left", "'.$gutterleft.'");
chart.Set("gutter.right", 2);
chart.Set("chart.text.font", "'.$charttextfont.'");
chart.Set("labels", '.$labels.');
chart.Set("chart.colors", '.$chartcolorsgradient.');
chart.Set("chart.colors.sequential", '.$sequential.');
chart.Set("xmax",100);
chart.Draw();
';
}
if ($allscore) {
$pageoutput .= '
var chart = new RGraph.HBar("cvs2", '.$allscore.');
chart.Set("chart.title", "'.$charttitle2.'");
chart.Set("chart.title.font", "'.$charttitlefont.'");
chart.Set("chart.title.size", "'.$charttitlesize.'");
chart.Set("chart.title.x", 400);
chart.Set("gutter.left", "'.$gutterleft.'");
chart.Set("gutter.right", 2);
chart.Set("chart.text.font", "'.$charttextfont.'");
chart.Set("labels", '.$labels.');
chart.Set("chart.colors", '.$chartcolorsgradient.');
chart.Set("chart.colors.sequential", '.$sequential.');
chart.Set("xmax",100);
chart.Draw();
';
}
$pageoutput .= '
}
</script>
';
break;
case 'radar':
$score = json_encode($score);
foreach ($labels as $key => $label) {
if ($key != 0) {
$labels[$key] = wordwrap($label, 20, "\\r\\n");
} else {
$labels[$key] = $label ."\\r\\n";
}
}
foreach ($labels as $value) {
$output[] = '"'.$value.'"';
}
$labels = '[' . implode(',', $output) . ']';
if ($allscore) {
$allscore = json_encode($allscore);
}
if (!$allresponses) {
$pageoutput .= '
<canvas id="cvs" width="550" height="400">[No canvas support]</canvas>
';
}
if ($allscore) {
$pageoutput .= '
<canvas id="cvs2" width="550" height="400">[No canvas support]</canvas>
';
}
$pageoutput .= '
<script>
window.onload = function () {';
if (!$allresponses) {
$pageoutput .= '
var chart = new RGraph.Radar("cvs", '.$score.');
chart.Set("chart.title", "'.$charttitle.'");
chart.Set("chart.labels", '.$labels.');
chart.Set("chart.labels.offset", 15);
chart.Set("chart.radius", 150);
chart.Set("chart.ymax", 100);
chart.Set("chart.labels.axes","n");
chart.Draw();
';
}
if ($allscore) {
$pageoutput .= '
var chart = new RGraph.Radar("cvs2", '.$allscore.');
chart.Set("chart.title", "'.$charttitle2.'");
chart.Set("chart.labels", '.$labels.');
chart.Set("chart.labels.offset", 15);
chart.Set("chart.radius", 150);
chart.Set("chart.ymax", 100);
chart.Set("chart.labels.axes","n");
chart.Draw();
';
}
$pageoutput .= '
}
</script>
';
break;
case 'rose':
if ($score != 'null') {
$score = json_encode($score);
}
foreach ($labels as $key => $label) {
$labels[$key] = wordwrap($label, 8, "\\r\\n");
}
foreach ($labels as $value) {
$output[] = '"'.$value.'"';
}
$labels = '[' . implode(',', $output) . ']';
if ($allscore) {
$allscore = json_encode($allscore);
}
$size = 400;
if (!$allresponses) {
$pageoutput .= '
<canvas id="cvs" width="'.$size.'" height="'.$size.'">[No canvas support]</canvas>
';
}
if ($allscore) {
$pageoutput .= '
<canvas id="cvs2" width="'.$size.'" height="'.$size.'">[No canvas support]</canvas>
';
}
$pageoutput .= '
<script>
window.onload = function () {';
if (!$allresponses) {
$pageoutput .= '
var chart = new RGraph.Rose("cvs", '.$score.');
chart.Set("chart.title", "'.$charttitle.'");
chart.Set("chart.title.font", "'.$charttitlefont.'");
chart.Set("chart.title.size", "'.$charttitlesize.'");
chart.Set("chart.title.vpos", 0.2);
chart.Set("chart.labels", '.$labels.');
chart.Set("chart.labels.offset", 10);
chart.Set("chart.background.grid.spokes", '.$nblabels.');
chart.Set("chart.labels.axes","n");
chart.Set("chart.radius", 100);
chart.Set("chart.ymax", 100);
chart.Set("chart.background.axes", false);
chart.Set("chart.colors.sequential", true);
chart.Set("chart.colors", ["Gradient(white:red)","Gradient(white:green)","Gradient(white:blue)",
"Gradient(white:gray)","Gradient(white:purple)","Gradient(white:pink)",
"Gradient(white:orange)","Gradient(white:black)"]);
chart.Draw();
';
}
if ($allscore) {
$pageoutput .= '
var chart = new RGraph.Rose("cvs2", '.$allscore.');
chart.Set("chart.title", "'.$charttitle2.'");
chart.Set("chart.title.font", "'.$charttitlefont.'");
chart.Set("chart.title.size", "'.$charttitlesize.'");
chart.Set("chart.title.vpos", 0.2);
chart.Set("chart.labels", '.$labels.');
chart.Set("chart.labels.offset", 10);
chart.Set("chart.background.grid.spokes", '.$nblabels.');
chart.Set("chart.labels.axes","n");
chart.Set("chart.radius", 100);
chart.Set("chart.ymax", 100);
chart.Set("chart.background.axes", false);
chart.Set("chart.colors.sequential", true);
chart.Set("chart.colors", ["Gradient(white:red)","Gradient(white:green)","Gradient(white:blue)",
"Gradient(white:gray)","Gradient(white:purple)","Gradient(white:pink)",
"Gradient(white:orange)","Gradient(white:black)"]);
chart.Draw();
';
}
$pageoutput .= '
}
</script>
';
break;
case 'vprogress':
if (!$allresponses) {
$score = $score[0];
} else {
$score = null;
}
$score = json_encode($score);
if ($allscore) {
$allscore = json_encode($allscore[0]);
}
// Check presence of pipe separator in label.
$lb = explode("|", $globallabel);
$maxlen = 0;
if (count($lb) > 1) {
$labels = array_reverse($lb);
// Find length of longest label.
$maxlen = 0;
foreach ($labels as $label) {
$labellen = core_text::strlen($label);
if ($labellen > $maxlen) {
$maxlen = $labellen;
}
}
foreach ($labels as $value) {
$output[] = '"'.$value.'"';
}
$labels = '[' . implode(',', $output) . ']';
} else {
$labels = '';
}
$charttextfont = 'Courier';
$gutterright = 150 + ($maxlen * 3);
$canvaswidth = 250 + ($maxlen * 3);
if (!$allresponses) {
$pageoutput .= '
<canvas id="cvs" width="'.$canvaswidth.'" height="400">[No canvas support]</canvas>
';
}
if ($allscore) {
$pageoutput .= '
<canvas id="cvs2" width="250" height="400">[No canvas support]</canvas>
';
}
$pageoutput .= '
<script>
window.onload = function () {';
if (!$allresponses) {
$pageoutput .= '
var chart = new RGraph.VProgress("cvs", '.$score.',100);
chart.Set("chart.gutter.top", 30);
chart.Set("chart.gutter.left", 50);
chart.Set("chart.gutter.right", "'.$gutterright.'");
chart.Set("scale.decimals", 0);
chart.Set("chart.text.font", "'.$charttextfont.'");
chart.Set("chart.title", "'.$charttitle.'");
chart.Set("chart.title.font", "'.$charttitlefont.'");
chart.Set("chart.title.size", "'.$charttitlesize.'");
';
if ($labels) {
$pageoutput .= '
chart.Set("chart.labels.specific", '.$labels.');
';
}
$pageoutput .= '
chart.Draw();
';
}
if ($allscore) {
// Display participants graph.
$pageoutput .= '
var chart = new RGraph.VProgress("cvs2", '.$allscore.',100);
chart.Set("chart.gutter.top", 30);
chart.Set("chart.gutter.left", 50);
chart.Set("chart.gutter.right", 150);
chart.Set("chart.title", "'.$charttitle2.'");
chart.Set("chart.text.font", "'.$charttextfont.'");
chart.Set("chart.title.font", "'.$charttitlefont.'");
chart.Set("chart.title.size", "'.$charttitlesize.'");
chart.Set("scale.decimals", 0);
chart.Draw();
';
}
$pageoutput .= '
}
</script>
';
break;
}
return $pageoutput;
}