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js9onchange.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http:https://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=Edge;chrome=1" >
<meta name="viewport" content="width=device-width, initial-scale=1">
<link type="image/x-icon" rel="shortcut icon" href="./favicon.ico">
<link type="text/css" rel="stylesheet" href="js9support.css">
<link type="text/css" rel="stylesheet" href="js9.css">
<script type="text/javascript" src="js9prefs.js"></script>
<script type="text/javascript" src="js9support.min.js"></script>
<script type="text/javascript" src="js9.min.js"></script>
<script type="text/javascript" src="js9plugins.js"></script>
<style type="text/css">
#myAnalysisDiv {
background: #E9E9E9;
border-width: 0px;
width: 440px;
padding: 10px;
overflow: auto;
}
#myAnalysisResults {
height: 400px;
}
#myButtonsDiv {
background: lightgrey;
border-width: 0px;
padding-left: 10px;
padding-right: 10px;
overflow: auto;
}
</style>
<title>JS9 onchange</title>
</head>
<body onload="initMyAnalysis()">
<script type="text/javascript">
var aname, im;
var lastim, lastreg;
var ncall = 0;
// this is the callback for all region changes
JS9.Regions.opts.onchange = "runMyAnalysis";
// called when the function changes to redo the last display
function redo(){
if( lastim && lastreg ){
runMyAnalysis(lastim, lastreg);
}
}
// add event handlers to the analysis buttons to execute the specified task
// note that jQuery is available automatically
function initMyAnalysis(){
$("#counts").on("click", function(evt){
aname = "counts"; redo();
});
$("#enplot").on("click", function(evt){
aname = "enplot"; redo();
});
$("#modify").on("click", function(evt){
aname = "modify"; redo();
});
$("#disp").on("click", function(evt){
aname = "disp"; redo();
});
$("#dispAll").on("click", function(evt){
aname = "dispAll"; redo();
});
}
// display analysis arguments
function dispMyRegions(im, reg){
var i, xreg, oxeq, wcs;
var t="";
var rarr=[];
var rdiv = $("#myAnalysisResults")[0];
// if reg is an array (i.e. contains all regions for this image),
// use it as the array to display
if( Object.prototype.toString.call(reg) === '[object Array]' ) {
rarr = reg;
} else {
// for a single region, construct an array
rarr.push(reg);
}
t = sprintf("image: %s size=%s,%s bitpix=%s<br>",
im.file, im.raw.width, im.raw.height, im.raw.bitpix);
// process all regions in the array
for(i=0; i<rarr.length; i++){
xreg = rarr[i];
t += sprintf("region: mode=%s shape=%s id=%s",
xreg.mode, xreg.shape, xreg.id);
t += sprintf("\n tag(s)=%s color=%s ",
xreg.tags.filter(function(n){return n;}).join(","),
xreg.color);
t += sprintf("\n impos=%.2f,%.2f physpos=%.2f,%.2f",
xreg.x, xreg.y, xreg.lcs.x, xreg.lcs.y);
wcs = JS9.PixToWCS(xreg.x, xreg.y, {display: im});
if( wcs ){
t += sprintf("\n wcs=%s", wcs.str.trim());
}
switch(xreg.shape){
case "annulus":
t += sprintf("\n radii=%s", xreg.radii);
break;
case "box":
t += sprintf("\n size=%.2f,%.2f angle=%.2f",
xreg.width, xreg.height, xreg.angle);
break;
case "circle":
t += sprintf("\n radius=%.2f", xreg.radius);
break;
case "ellipse":
t += sprintf("\n eradius=%.2f,%.2f angle=%.2f",
xreg.r1, xreg.r2, xreg.angle);
break;
case "point":
break;
case "polygon":
t += sprintf("\n pts=");
for(j=0; j<xreg.pts.length; j++){
t += sprintf("%.2f,%.2f ", xreg.pts[j].x, xreg.pts[j].y);
}
break;
case "text":
t += sprintf("\n text=%s", xreg.text);
break;
}
t += "\n";
}
// display all regions
rdiv.innerHTML = "<pre>" + t + "<\/pre>";
}
//
function modifyMyRegion(im, xreg){
var swidth, oxeq, tag, angle, color;
var swidths=[2, 4, 6, 8];
var angles=[7, 15, 30, 60, 90, 120, 180, 270, 360];
var colors=["red", "orange", "yellow", "green", "blue"];
var tags=["include,source", "exclude,source", "include,background", "exclude,background", "defcolor"];
// change region to test JS9.Regions()
tag = tags[ncall%tags.length];
angle = angles[ncall%angles.length];
color = colors[ncall%colors.length];
// temporarily disable onchange callback, since we are going to change
// the region and we don't want an infinite loop!
switch(xreg.shape){
case "annulus":
JS9.ChangeRegions(xreg.id,
{x: xreg.x + 5, y: xreg.y + 5},
{display: im});
break;
case "box":
JS9.ChangeRegions(xreg.id,
{color: color, angle: angle},
{display: im});
break;
case "circle":
JS9.ChangeRegions(xreg.id,
{radius: xreg.radius + 2, tag: tag},
{display: im});
break;
case "ellipse":
JS9.ChangeRegions(xreg.id,
{r1: xreg.r1 + 4, r2: xreg.r2 + 2, angle: angle},
{display: im});
break;
case "polygon":
JS9.ChangeRegions(xreg.id,
{angle: angle},
{display: im});
break;
}
dispMyRegions(im, xreg);
ncall += 1;
}
// run analysis on current image, defining a function to display results
function runMyAnalysis(im, xreg){
var rarr = [];
lastim = im;
lastreg = xreg;
if( aname ){
switch(aname){
case "counts":
JS9.RunAnalysis("counts", null, dispMyAnalysis);
break;
case "enplot":
JS9.RunAnalysis("energyplot", null, dispMyAnalysis);
break;
case "modify":
modifyMyRegion(im, xreg);
break;
case "disp":
dispMyRegions(im, xreg);
break;
case "dispAll":
rarr = JS9.GetRegions();
dispMyRegions(im, rarr);
break;
default:
JS9.error("unknown analysis task: "+aname);
break;
}
}
}
function runMyAnalysis2(im, xreg){
runMyAnalysis(im, xreg);
}
// display function passed to JS9.RunAnalysis
// when the analysis task is complete, this callback displays results
function dispMyAnalysis(stdout, stderr, errcode, a){
var rdiv = $("#myAnalysisResults")[0];
if( !rdiv ){
alert("the analysis results area is missing on this web page");
}
else if( stderr ){
alert(stderr);
} else {
switch(a.rtype){
case "text":
// text can just get shoved into the div
rdiv.innerHTML = "<pre>" + stdout + "<\/pre>";
break;
case "plot":
// plot can make use of the already-loaded flot routines
// ( and JS9.plotOpts is defined in js9-version.js)
try{
// retrieve plot object (should contain a data object)
pobj = JSON.parse(stdout);
if( pobj && pobj.data ){
// erase explanatory text
rdiv.innerHTML = "";
// plot the data
$.plot(rdiv, [pobj], JS9.plotOpts);
} else {
alert("no analysis data returned");
}
}
catch(e){ alert("can't plot data: "+e+" "+stdout)};
break;
}
}
}
</script>
<center><font size="+1">
<b>JS9 Demo: running tasks in response to region changes</b>
</font></center>
<table cellspacing="20">
<tr valign="top">
<td>
FITS representation files:
<ul>
<li> <a href='javascript:JS9.Load("fits/casa.fits.gz", {scale:"log", parentFile:"fits/casa.fits"});'>CAS-A (Chandra)</a>
<li> <a href='javascript:JS9.Load("fits/3c273.fits.gz", {scale:"log", colormap:"heat", parentFile:"fits/3c273.fits"});'>3c273 (Chandra)</a>
<li> <a href='javascript:JS9.Load("fits/3c58.fits.gz", {scale:"log", colormap:"cool", parentFile:"fits/3c58.fits"});'>3c58 (Chandra)</a>
</ul>
</td>
<td>
FITS images and binary tables:
<ul>
<li> <a href='javascript:JS9.Load("fits/snr.fits", {scale:"log", colormap:"heat"});'>CTB 109 (Einstein, small)</a>
<li> <a href='javascript:JS9.Load("fits/ngc1316.fits", {scale:"linear", colormap:"cool"});'>ngc1316 (AIPS, small)</a>
<li> <a href='javascript:JS9.Load("fits/ngkper.fits", {scale:"log"});'>gkper (Chandra, 7.6Mb)</a>
</ul>
</td>
</tr>
<tr valign="top">
<td>
<div class="JS9Menubar"></div>
<div class="JS9"></div>
</td>
<td>
<form autocomplete="off" action="">
<div id="myButtonsDiv">
<div id="myButtonsBox">
<input type="radio" name="onchange" id="disp">Display a Region
<input type="radio" name="onchange" id="dispAll">Display all Regions
<input type="radio" name="onchange" id="modify">Modify a Region
<br>
<input type="radio" name="onchange" id="enplot">Energy Spectrum
<input type="radio" name="onchange" id="counts">Counts in Regions
</div>
</div>
</form>
<div id="myAnalysisDiv">
<div id="myAnalysisResults">
JS9 can perform local and remote tasks in response to region changes:
<ul>
<li> choose a task by clicking one of the analysis buttons above
<ul>
<li> the region tasks are local (browser-based) tasks
<li> spectrum, counts are remote tasks (requiring the back-end helper to be running)
</ul>
<li> display an image by clicking on one of the data files
<li> create a region using the JS9 Region menu
<li> as you move/resize the region, the task will run on that region
<li> you can suspend task execution by unselecting xeqOnChange in the JS9 Region menu
</ul>
See the page source for implementation details.
</div>
</div>
</td>
</tr>
</table>
<p>
JS9 Demos:
<ul>
<li><a href='js9basics.html'>JS9 Demo: the basics</a>
<li><a href='js9bespoke.html'>JS9 Demo: web page control of JS9</a>
<li><a href='js9sizes.html'>JS9 Demo: setting the size of the JS9 display</a>
<li><a href='js9large.html'>JS9 Demo: support for large FITS files</a>
<li><a href='js9plugins.html'>JS9 Demo: adding plugins to JS9</a>
<li><a href='js9imexam.html'>JS9 Demo: the imexam plugin for JS9</a>
<li><a href='js9blend.html'>JS9 Demo: image blending</a>
<li><a href='js9cat.html'>JS9 Demo: overlaying catalogs</a>
<li><a href='js9panzoom.html'>JS9 Demo: pan and zoom</a>
<li><a href='js9rgb.html'>JS9 Demo: RGB composite images</a>
<li><a href='js9multi.html'>JS9 Demo: independent instances of JS9</a>
<li><a href='js9analysis.html'>JS9 Demo: remote data analysis</a>
<li><a href='js9onchange.html'>JS9 Demo: running tasks when a region changes</a>
<li><a href='js9create.html'>JS9 Demo: creating a JS9 instance dynamically</a>
<li><a href='js9preload.html'>JS9 Demo: preloading images into JS9</a>
<li><a href='js9bitpix.html'>JS9 Demo: displaying different FITS datatypes</a>
<li><a href='js9allinone.html'>JS9 Demo: using the all-in-one files</a>
<li><a href='js9pngvsfits.html'>JS9 Demo: PNG representation files vs FITS files</a>
</ul>
</body>
</html>