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<html>
<head>
<title>Graph3d documentation</title>
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<pre class="prettyprint lang-php">
<?php
/*
This datasource returns a response in the form of a google query response
USAGE
All parameters are optional
datasource.php?xmin=0&xmax=314&xstepnum=25&ymin=0&ymax=314&ystepnum=25
DOCUMENTATION
http://code.google.com/apis/visualization/documentation/dev/implementing_data_source.html
EXAMPLE OF A RESPONSE FILE
Note that the reqId in the response must correspond with the reqId from the
request.
________________________________________________________________________________
google.visualization.Query.setResponse({
version:'0.6',
reqId:'0',
status:'ok',
table:{
cols:[
{id:'x',
label:'x',
type:'number'},
{id:'y',
label:'y',
type:'number'},
{id:'value',
label:'value',
type:'number'}
],
rows:[
{c:[{v:0}, {v:0}, {v:10.0}]},
{c:[{v:1}, {v:0}, {v:12.0}]},
{c:[{v:2}, {v:0}, {v:13.0}]},
{c:[{v:0}, {v:1}, {v:11.0}]},
{c:[{v:1}, {v:1}, {v:14.0}]},
{c:[{v:2}, {v:1}, {v:11.0}]}
]
}
});
________________________________________________________________________________
*/
/**
* A custom function
*/
function custom($x, $y) {
$d = sqrt(pow($x/100, 2) + pow($y/100, 2));
return 50 * exp(-5 * $d / 10) * sin($d*5)
}
// retrieve parameters
$default_stepnum = 25;
$xmin = isset($_REQUEST['xmin']) ? (float)$_REQUEST['xmin'] : -100;
$xmax = isset($_REQUEST['xmax']) ? (float)$_REQUEST['xmax'] : 100;
$xstepnum = isset($_REQUEST['xstepnum']) ? (int)$_REQUEST['xstepnum'] : $default_stepnum;
$ymin = isset($_REQUEST['ymin']) ? (float)$_REQUEST['ymin'] : -100;
$ymax = isset($_REQUEST['ymax']) ? (float)$_REQUEST['ymax'] : 100;
$ystepnum = isset($_REQUEST['ystepnum']) ? (int)$_REQUEST['ystepnum'] : $default_stepnum;
// in the reply we must fill in the request id that came with the request
$reqId = getReqId();
// check for a maximum number of datapoints (for safety)
if ($xstepnum * $ystepnum > 10000) {
echo "google.visualization.Query.setResponse({
version:'0.6',
reqId:'$reqId',
status:'error',
errors:[{reason:'not_supported', message:'Maximum number of datapoints exceeded'}]
});";
exit;
}
// output the header part of the response
echo "google.visualization.Query.setResponse({
version:'0.6',
reqId:'$reqId',
status:'ok',
table:{
cols:[
{id:'x',
label:'x',
type:'number'},
{id:'y',
label:'y',
type:'number'},
{id:'value',
label:'',
type:'number'}
],
rows:[";
// output the actual values
$first = true;
$xstep = ($xmax - $xmin) / $xstepnum;
$ystep = ($ymax - $ymin) / $ystepnum;
for ($x = $xmin; $x < $xmax; $x+=$xstep) {
for ($y = $ymin; $y < $ymax; $y+=$ystep) {
$value = custom($x,$y);
if (!$first) {
echo ",\n";
}
else {
echo "\n";
}
echo " {c:[{v:$x}, {v:$y}, {v:$value}]}";
$first = false;
}
}
// output the end part of the response
echo "
]
}
});
";
/**
* Retrieve the request id from the get/post data
* @return {number} $reqId The request id, or 0 if not found
*/
function getReqId() {
$reqId = 0;
foreach ($_REQUEST as $req) {
if (substr($req, 0,6) == "reqId:") {
$reqId = substr($req, 6);
}
}
return $reqId;
}
?>
</pre>
</body>
</html>
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