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155 lines
3.3 KiB
155 lines
3.3 KiB
<?php
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/*
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This datasource returns a response in the form of a google query response
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USAGE
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All parameters are optional
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datasource.php?xmin=0&xmax=314&xstepnum=25&ymin=0&ymax=314&ystepnum=25
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DOCUMENTATION
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http://code.google.com/apis/visualization/documentation/dev/implementing_data_source.html
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EXAMPLE OF A RESPONSE FILE
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Note that the reqId in the response must correspond with the reqId from the
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request.
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________________________________________________________________________________
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google.visualization.Query.setResponse({
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version:'0.6',
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reqId:'0',
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status:'ok',
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table:{
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cols:[
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{id:'x',
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label:'x',
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type:'number'},
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{id:'y',
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label:'y',
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type:'number'},
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{id:'value',
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label:'value',
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type:'number'}
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],
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rows:[
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{c:[{v:0}, {v:0}, {v:10.0}]},
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{c:[{v:1}, {v:0}, {v:12.0}]},
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{c:[{v:2}, {v:0}, {v:13.0}]},
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{c:[{v:0}, {v:1}, {v:11.0}]},
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{c:[{v:1}, {v:1}, {v:14.0}]},
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{c:[{v:2}, {v:1}, {v:11.0}]}
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]
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}
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});
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________________________________________________________________________________
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*/
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/**
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* A custom function
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*/
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function custom($x, $y) {
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$d = sqrt(pow($x/100, 2) + pow($y/100, 2));
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return 50 * exp(-5 * $d / 10) * sin($d*5);
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}
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// retrieve parameters
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$default_stepnum = 25;
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$xmin = isset($_REQUEST['xmin']) ? (float)$_REQUEST['xmin'] : -100;
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$xmax = isset($_REQUEST['xmax']) ? (float)$_REQUEST['xmax'] : 100;
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$xstepnum = isset($_REQUEST['xstepnum']) ? (int)$_REQUEST['xstepnum'] : $default_stepnum;
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$ymin = isset($_REQUEST['ymin']) ? (float)$_REQUEST['ymin'] : -100;
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$ymax = isset($_REQUEST['ymax']) ? (float)$_REQUEST['ymax'] : 100;
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$ystepnum = isset($_REQUEST['ystepnum']) ? (int)$_REQUEST['ystepnum'] : $default_stepnum;
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// in the reply we must fill in the request id that came with the request
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$reqId = getReqId();
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// check for a maximum number of datapoints (for safety)
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if ($xstepnum * $ystepnum > 10000) {
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echo "google.visualization.Query.setResponse({
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version:'0.6',
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reqId:'$reqId',
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status:'error',
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errors:[{reason:'not_supported', message:'Maximum number of datapoints exceeded'}]
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});";
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exit;
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}
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// output the header part of the response
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echo "google.visualization.Query.setResponse({
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version:'0.6',
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reqId:'$reqId',
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status:'ok',
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table:{
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cols:[
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{id:'x',
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label:'x',
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type:'number'},
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{id:'y',
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label:'y',
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type:'number'},
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{id:'value',
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label:'',
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type:'number'}
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],
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rows:[";
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// output the actual values
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$first = true;
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$xstep = ($xmax - $xmin) / $xstepnum;
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$ystep = ($ymax - $ymin) / $ystepnum;
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for ($x = $xmin; $x < $xmax; $x+=$xstep) {
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for ($y = $ymin; $y < $ymax; $y+=$ystep) {
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$value = custom($x,$y);
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if (!$first) {
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echo ",\n";
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}
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else {
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echo "\n";
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}
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echo " {c:[{v:$x}, {v:$y}, {v:$value}]}";
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$first = false;
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}
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}
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// output the end part of the response
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echo "
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]
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}
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});
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";
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/**
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* Retrieve the request id from the get/post data
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* @return {number} $reqId The request id, or 0 if not found
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*/
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function getReqId() {
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$reqId = 0;
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foreach ($_REQUEST as $req) {
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if (substr($req, 0,6) == "reqId:") {
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$reqId = substr($req, 6);
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}
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}
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return $reqId;
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}
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?>
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