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js9.js
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js9.js
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/*
*
* JS9: astronomical image display everywhere (December 10, 2012)
*
* Principals: Eric Mandel, Alexey Vikhlinin
* Organization: Harvard Smithsonian Center for Astrophysics, Cambridge MA
* Contact: saord@cfa.harvard.edu
*
* Copyright (c) 2012 - 2017 Smithsonian Astrophysical Observatory
*
*/
/*global JS9Prefs, $, jQuery, Event, fabric, io, CanvasRenderingContext2D, sprintf, Blob, ArrayBuffer, Uint8Array, Uint16Array, Int8Array, Int16Array, Int32Array, Float32Array, Float64Array, DataView, FileReader, Fitsy, Astroem, dhtmlwindow, saveAs, Spinner, ResizeSensor, Jupyter, gaussBlur, ImageFilters, Plotly */
// define Escripten Module so we can pass properties (e.g. wasmBinary)
// eslint-disable-next-line no-unused-vars
var Module = {};
// JS9 module
var JS9 = (function(){
"use strict";
// module header
var JS9 = {};
JS9.NAME = "JS9"; // The name of this namespace
JS9.VERSION = "2.0.2"; // The version of this namespace
JS9.COPYRIGHT = "Copyright (c) 2012-2017 Smithsonian Institution";
// internal defaults (not usually changed by users)
JS9.DEFID = "JS9"; // default JS9 display id
JS9.WIDTH = 512; // width of js9 canvas
JS9.HEIGHT = 512; // height of js9 canvas
JS9.ANON = "Anonymous"; // name to use for images with no name
JS9.PREFSFILE = "js9Prefs.json";// prefs file to load
JS9.WORKERFILE = "js9worker.js";// js9 web worker file to load
JS9.ZINDEX = 0; // z-index of image canvas: on bottom of js9
JS9.SHAPEZINDEX = 4; // base z-index of shape layers layers
JS9.MESSZINDEX = 80; // z-index of messages: above graphics
JS9.BTNZINDEX = 90; // z-index of buttons on top of plugin canvases
JS9.MENUZINDEX = 1000; // z-index of menus: always on top!
JS9.COLORSIZE = 1024; // size of contrast/biased color array
JS9.SCALESIZE = 16384; // size of scaled color array
JS9.INVSIZE = 1024; // size of inverse array
JS9.HISTSIZE = 16384; // size of histogram equalization array
JS9.INSTALLDIR=""; // prefix to get to js9 install directory
JS9.TOROOT=""; // prefix to get to data file from install
JS9.PLUGINS=""; // regexp list of plugins
JS9.LIGHTWIN = "dhtml"; // light window type: choice of dhtml
JS9.ANTIALIAS = false; // use anti-aliasing?
JS9.SCALEIREG = true; // scale interactive regions by zoom factor?
JS9.NOMOVE = 3; // number of pixels before we recognize movement
JS9.DBLCLICK = 300; // millisec for double-click
JS9.TIMEOUT = 250; // millisec before assuming light window is up
JS9.SPINOUT = 250; // millisec before assuming spinner is up
JS9.SUPERMENU = /^SUPERMENU_/; // base of supermenu id
JS9.RESIZEDIST = 20; // size of rectangle defining resize handle
JS9.RESIZEFUDGE = 5; // fudge for webkit resize problems
JS9.RAWID0 = "raw0"; // default raw id
JS9.RAWIDX = "alt"; // default "alternate" raw id
JS9.REPROJDIM = 2300; // max dimension for reprojection
JS9.IDFMT = " (%s)"; // format for light window id
JS9.MINZOOM = 0.125; // min zoom using scrool wheel
JS9.MAXZOOM = 16.0; // max zoom using scrool wheel
JS9.ADDZOOM = 0.05; // add/subtract amount per mouse wheel click
JS9.CHROMEFILEWARNING = true; // whether to alert chrome users about file URI
// https://hacks.mozilla.org/2013/04/detecting-touch-its-the-why-not-the-how/
JS9.TOUCHSUPPORTED = ( window.hasOwnProperty("ontouchstart") ||
(navigator.maxTouchPoints > 0) ||
(navigator.msMaxTouchPoints > 0));
// modified from:
// http://stackoverflow.com/questions/2400935/browser-detection-in-javascript
JS9.BROWSER = (function(){
var P= navigator.platform;
var N= navigator.appName, ua= navigator.userAgent, tem;
var M= ua.match(/(opera|chrome|safari|firefox|msie)\/?\s*(\.?\d+(\.\d+)*)/i);
tem= ua.match(/version\/([\.\d]+)/i);
if(M && tem !== null){ M[2]= tem[1]; }
M= M? [M[1], M[2], P]: [N, navigator.appVersion,'-?', P];
M.push(/Android|webOS|iPhone|iPad|iPod|BlackBerry/i.test(ua));
return M;
}());
// convenience to allow plugins to deal with HiDPI ratio blurring
// http://stackoverflow.com/questions/15661339/how-do-i-fix-blurry-text-in-my-html5-canvas
JS9.PIXEL_RATIO = (function(){
var ctx = document.createElement("canvas").getContext("2d"),
dpr = window.devicePixelRatio || 1,
bsr = ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio || 1;
return dpr / bsr;
}());
// global options
JS9.globalOpts = {
helperType: "none", // one of: sock.io, get, post, none
helperPort: 2718, // default port for node.js helper
useWasm: true, // use WebAssembly if available?
winType: "light", // plugin window: "light" or "new"
rgb: {active: false, // RGB mode
rim: null,
gim: null,
bim: null},
defcolor: "#00FF00", // graphics color when all else fails
pngisfits: true, // are PNGs really PNG representation files?
fits2fits: "size>100", // convert to repfile? always|never|size>x Mb
fits2png: false, // convert FITS to PNG rep files? true|false
alerts: true, // set to false to turn off alerts
internalValPos: true, // a fancy info plugin can turns this off
internalContrastBias: true, // a fancy colorbar plugin can turns this off
containContrastBias: false, // contrast/bias only when mouse is in display?
htimeout: 5000, // connection timeout for the helper connect
lhtimeout: 1000, // connection timeout for local helper connect
ehtimeout: 1000, // connection timeout for Electron connect
ehretries: 10, // connection retries Electron connect
xtimeout: 180000, // connection timeout for fetch data requests
extlist: "EVENTS STDEVT", // list of binary table extensions
table: {xdim: 2048, ydim: 2048, bin: 1},// image section size to extract from table
image: {xdim: 2048, ydim: 2048, bin: 1},// image section size (0 for unlimited)
clearImageMemory: "never", // rm vfile: always|never|auto|noExt|noCube|size>x Mb
helperProtocol: location.protocol, // http: or https:
maxMemory: 750000000, // max heap memory to allocate for a fits image
corsURL: "params/loadcors.html", // location of param html file
proxyURL: "params/loadproxy.html", // location of param html file
loadProxy: false, // do we allow proxy load requests to server?
archivesURL: "help/archives.html", // location of archives help file
imsectionURL: "params/imsection.html", // location of param html file
postMessage: false, // allow communication through iframes?
waitType: "spinner", // "spinner" or "mouse"
spinColor: "#FF0000", // color of spinner
spinOpacity: 0.35, // opacity of spinner
resize: true, // allow resize of display?
resizeHandle: true, // add resize handle to display?
resizeRedisplay: true, // redisplay image while resizing?
cloneNewDisplay: true, // clone size of display, when possible?
regionConfigSize: "medium", // "small", "medium"
mouseActions: ["display value/position", "change contrast/bias", "pan the image"],// 0,1,2 mousepress
touchActions: ["display value/position", "change contrast/bias", "pan the image"],// 1,2,3 fingers
keyboardActions: {
b: "toggle selected region: source/background",
e: "toggle selected region: include/exclude",
r: "make regions layer active",
"/": "copy wcs position to clipboard",
"?": "copy value and position to clipboard",
"0": "reset zoom",
"=": "zoom in",
"+": "zoom in",
"-": "zoom out",
">": "display next image",
"<": "display previous image",
"delete": "remove selected region",
"leftArrow": "move selected region left",
"upArrow": "move selected region up",
"rightArrow": "move selected region right",
"downArrow": "move selected region down"
}, // keyboard actions
mousetouchZoom: false, // use mouse wheel, pinch to zoom?
centerDivs: ["JS9Menubar"], // divs that take part in JS9.Display.center()
pinchWait: 8, // number of events to wait before testing pinch
pinchThresh: 6, // threshold for pinch test
extendedPlugins: true, // enable extended plugin support?
corsProxy: "https://js9.si.edu/cgi-bin/CORS-proxy.cgi", // CORS proxy
simbadProxy: "https://js9.si.edu/cgi-bin/simbad-proxy.cgi", // simbad proxy
catalogs: {ras: ["RA", "_RAJ2000", "RAJ2000"], // cols to search for ..
decs: ["Dec", "_DEJ2000", "DEJ2000"],// when loading catalogs
shape: "circle", // object shape
color: "yellow", // object color
width: 7, // box object width
height: 7, // box object height
radius: 3.5, // circle object radius
r1: 5.0, // ellipse object r1
r2: 3.5, // ellipse object r2
wcssys: "ICRS", // wcs system
skip: "#\n", // skip # and blank lines
save: true, // save cat cols in shapes
tooltip: "$xreg.data.ra $xreg.data.dec"}, // tooltip format
topColormaps: ["grey", "heat", "cool", "viridis", "magma", "sls", "a", "b", "red", "green", "blue"], // toplevel colormaps
infoBox: ["file", "object", "wcsfov", "wcscen", "wcspos", "impos", "physpos", "value", "regions", "progress"],
menuBar: ["file", "view", "zoom", "scale", "color", "region", "wcs", "analysis", "help"],
hiddenPluginDivs: [], // which static plugin divs start hidden
imageTemplates: ".fits,.fts,.png,.jpg,.jpeg", // templates for local images
regionTemplates: ".reg", // templates for local region file input
sessionTemplates: ".ses", // templates for local session file input
colormapTemplates: ".cmap", // templates for local colormap file input
catalogTemplates: ".cat,.tab", // templates for local catalog file input
controlsMatchRegion: "corner", // true or "corner" or "border"
newWindowWidth: 530, // width of LoadWindow("new")
newWindowHeight: 625, // height of LoadWindow("new")
debug: 0 // debug level
};
// image param defaults
JS9.imageOpts = {
inherit: false, // inherit props from previous image?
contrast: 1.0, // default color contrast
bias: 0.5, // default color bias
invert: false, // default colormap invert
exp: 1000, // default exp value for scaling
colormap: "grey", // default color map
scale: "linear", // default scale algorithm
scaleclipping: "dataminmax", // "dataminmax" or "zscale" to start
zscalecontrast: 0.25, // default from ds9
zscalesamples: 600, // default from ds9
zscaleline: 120, // default from ds9
wcssys: "native", // default WCS sys
wcsunits: "sexagesimal", // default WCS units
lcs: "physical", // default logical coordinate system
valpos: true, // whether to display value/position
opacity: 1.0, // opacity between 0 and 1
sigma: "none", // gauss blur sigma or none
maskOpacity: 0.4, // opacity for masked pixels
alpha: 255, // alpha for image (but use opacity!)
alpha1: 100, // alpha for masked pixels
// xcen: 0, // default x center pos to pan to
// ycen: 0, // default y center pos to pan to
zoom: 1, // default zoom factor
zooms: 5, // how many zooms in each direction?
nancolor: "#000000", // 6-digit #hex color for NaN values
wcsalign: true, // align image using wcs after reproj?
rotationMode: "relative", // default: relative or absolute?
listonchange: false // whether to list after a reg change
};
// allows regions opts to be overridden in preferences
JS9.regionOpts = {
};
// defaults for analysis (macro expansion)
JS9.analOpts = {
// if this pattern is matched in stderr, throw a real error
epattern: /^(ERROR:[^\n]*)\n/,
// location of datapath's param html file
dpathURL: "params/datapath.html",
// prepend $JS9_DIR to relative fitsFile paths?
prependJS9Dir: true,
// use as path to FITS data or use incoming path if not set
dataDir: null
};
// light window opts
JS9.lightOpts = {
nclick: 0,
dhtml: {
top: ".dhtmlwindow",
drag: ".drag-contentarea",
dragBar: "drag-handle",
format: "width=%spx,height=%spx,center=1,resize=%s,scrolling=0",
textWin: "width=830px,height=400px,center=1,resize=1,scrolling=1",
// NB: dimensions are tied to .JS9Plot CSS params
plotWin: "width=830px,height=420px,center=1,resize=1,scrolling=1",
dpathWin: "width=830px,height=175px,center=1,resize=1,scrolling=1",
paramWin: "width=830px,height=230px,center=1,resize=1,scrolling=1",
regWin0: "width=600px,height=72px,center=1,resize=1,scrolling=1",
regWin: "width=600px,height=235px,center=1,resize=1,scrolling=1",
imageWin: "width=512px,height=598px,center=1,resize=1,scrolling=1",
lineWin: "width=400px,height=60px,center=1,resize=1,scrolling=1"
}
};
// colors for text messages
JS9.textColorOpts = {
regions: "#00FF00",
info: "#00FF00",
inimage: "#000000"
};
// defaults for plot creation
JS9.plotOpts = {
// generic options
annotate: false,
annotateColor: "#FF0000",
color: "blue",
// flot options
zoomStack: {
enabled: true
},
selection: {
mode: "xy"
},
series: {
clickable: true,
hoverable: true,
lines: { show: true },
points: { show: false }
},
legend: {
backgroundColor: null,
backgroundOpacity: 0
},
// plotly options
xaxis: {
autorange: true
},
yaxis: {
autorange: true
}
};
// help pages
JS9.helpOpts = {
user: {
heading: "JS9Help",
type: "help", url:"user.html",
title: "User Manual"
},
install: {
heading: "JS9Help",
type: "help", url:"install.html",
title: "Installing JS9"
},
webpage: {
heading: "JS9Help",
type: "help", url:"webpage.html",
title: "Adding JS9 To A Web Page"
},
yourdata: {
heading: "JS9Help",
type: "help", url:"yourdata.html",
title: "Adding Data To A Web Page"
},
localtasks: {
heading: "JS9Help",
type: "help", url:"localtasks.html",
title: "Adding Local Analysis Tasks and Plugins"
},
helper: {
heading: "JS9Help",
type: "help", url:"helper.html",
title: "Adding Server-side Analysis Tasks"
},
serverside: {
heading: "JS9Help",
type: "help", url:"serverside.html",
title: "Server-side Analysis with JS9"
},
publicapi: {
heading: "JS9Help",
type: "help", url:"publicapi.html",
title: "The JS9 Public API"
},
repfile: {
heading: "JS9Help",
type: "help", url:"repfile.html",
title: "Dealing with Large Files"
},
memory: {
heading: "JS9Help",
type: "help", url:"memory.html",
title: "Dealing with Memory Limitations"
},
regions: {
heading: "JS9Help",
type: "help", url:"regions.html",
title: "Regions Format"
},
extmsg: {
heading: "JS9Help",
type: "help", url:"extmsg.html",
title: "External Messaging"
},
python: {
heading: "JS9Help",
type: "help", url:"python.html",
title: "JS9 with Python and Jupyter"
},
preferences: {
heading: "JS9Help",
type: "help", url:"preferences.html",
title: "Setting Site Preferences"
},
changelog: {
heading: "JS9Help",
type: "help", url:"changelog.html",
title: "ChangeLog"
},
issues: {
heading: "JS9Help",
type: "help", url:"knownissues.html",
title: "Known Issues"
}
};
// containers for groups of JS9 objects
JS9.images = []; // array of current images
JS9.displays = []; // array of current display canvases
JS9.colormaps = []; // array of current colormaps
JS9.commands = []; // array of commands
JS9.plugins = []; // array of defined plugins
JS9.preloads = []; // array of images to preload
JS9.auxFiles = []; // array of auxiliary files
JS9.supermenus = []; // array containing supermenu instances
JS9.publics = {}; // object containing defined public API calls
JS9.helper = {}; // only one helper per page, please
JS9.fits = {}; // object holding FITS access routines
JS9.userOpts = {}; // object to hold localStorage opts
// misc params
// list of scales in mkScaledCells
JS9.scales = ["linear", "log", "histeq", "power", "sqrt", "squared", "asinh", "sinh"];
// list of known wcs systems
JS9.wcssyss = ["FK4", "FK5", "ICRS", "galactic", "ecliptic", "native",
"image", "physical"];
// list of known wcs units
JS9.wcsunitss = ["degrees", "sexagesimal", "pixels"];
// known bugs and work-arounds
JS9.bugs = {};
// sometimes hiding the menu does not refresh the image properly
// JS9.bugs.hide_menu = true;
// turned off: 6/30/16
JS9.bugs.hide_menu = false;
// firefox does not repaint as needed (last checked FF 24.0 on 10/20/13)
if( (JS9.BROWSER[0] === "Firefox") && JS9.BROWSER[2].search(/Linux/) >=0 ){
JS9.bugs.firefox_linux = true;
}
// webkit resize is not quite up to par
if( (JS9.BROWSER[0] === "Chrome") || (JS9.BROWSER[0] === "Safari") ){
JS9.bugs.webkit_resize = true;
}
// chrome does not deal with ".gz" file templates, but other browsers do
if( (JS9.BROWSER[0] !== "Chrome") ){
JS9.globalOpts.imageTemplates += ",.gz";
}
// iOS has severe memory limits (05/2017)
if( JS9.BROWSER[3] ){
JS9.globalOpts.maxMemory = Math.min(JS9.globalOpts.maxMemory, 350000000);
JS9.globalOpts.image.xdim = 2048 * 2;
JS9.globalOpts.image.ydim = 2048 * 2;
}
// ---------------------------------------------------------------------
// JS9 Image object to manage images
// ---------------------------------------------------------------------
JS9.Image = function(file, params, func){
var i, card, pars, sarr, nzoom;
var display;
var that = this;
var localOpts=null;
var mksect = function(that, localOpts){
var zoom;
var arr = [];
// make up section array from default values
if( localOpts && (localOpts.xcen !== undefined) ){
arr.push(localOpts.xcen);
}
if( localOpts && (localOpts.ycen !== undefined) ){
arr.push(localOpts.ycen);
}
if( localOpts && (localOpts.zoom !== undefined) ){
zoom = that.parseZoom(localOpts.zoom);
if( zoom ){
arr.push(zoom);
}
}
return arr;
};
var finishUp = function(func){
// clear previous messages
this.display.clearMessage();
// add to list of images
JS9.images.push(this);
// call function, if necessary
if( func ){
try{ JS9.xeqByName(func, window, this); }
catch(e){ JS9.error("in image onload callback", e, false); }
}
// plugin callbacks
this.xeqPlugins("image", "onimageload");
// update shapes?
if( this.updateshapes ){
this.updateShapes("regions", "all", "update");
}
// load is complete
this.status.load = "complete";
// done loading, reset wait cursor
JS9.waiting(false);
};
// params can be an object containing local params, or the display string
if( params ){
if( typeof params === "object" ){
localOpts = params;
if( localOpts.display ){
display = localOpts.display;
}
} else {
display = params;
}
}
// make sure we have a valid display
if( !display ){
if( JS9.displays.length > 0 ){
display = JS9.displays[0].id;
} else {
display = JS9.DEFID;
}
}
// it's an image
this.type = "image";
// set the display
this.display = JS9.lookupDisplay(display);
// initialize image params
this.params = {};
// image-specific scratch space
this.tmp = {};
// scale min and max to impossible numbers
this.params.scalemin = Number.Nan;
this.params.scalemax = Number.Nan;
// xeq callback for region changes?
this.params.xeqonchange = true;
// copy image parameters
this.params = $.extend(true, this.params, JS9.imageOpts, localOpts);
// inherit properties, if necessary
if( this.display.image ){
this.params.inherit = this.display.image.params.inherit;
if( this.params.inherit ){
this.params = $.extend(true,
this.params, this.display.image.params);
}
}
// set the colormap object from colormap name (text string)
// this.cmapObj = JS9.lookupColormap(this.params.colormap);
this.setColormap(this.params.colormap);
// do we display?
this.displayMode = true;
// initialize click state
this.clickState = 0;
// initialize click in region
this.clickInRegion = false;
this.clickInLayer = null;
// no helper queried yet
this.queried = false;
// is this a proxy image?
if( localOpts && localOpts.proxyFile ){
this.proxyFile = localOpts.proxyFile;
}
// was a "parent" FITS file specified?
if( localOpts && localOpts.parentFile ){
this.parentFile = localOpts.parentFile;
}
// was "parent" info specified?
if( localOpts && localOpts.parent ){
this.parent = localOpts.parent;
// convert card string to header
if( this.parent.cardstr && this.parent.ncard ){
this.parent.raw = {header: {}};
for(i=0; i<this.parent.ncard; i++){
card = this.parent.cardstr.slice(i*80, (i+1)*80);
pars = JS9.cardpars(card);
if( pars !== undefined ){
this.parent.raw.header[pars[0]] = pars[1];
}
}
// initialize LCS for this parent header
this.parent.lcs = {};
JS9.Image.prototype.initLCS.call(this.parent,
this.parent.raw.header);
}
}
// was an id specified?
if( localOpts && localOpts.id ){
this.id = localOpts.id;
}
// offsets into canvas to display
this.ix = 0;
this.iy = 0;
// create the png object
this.png = {};
// image element to hold png file, from which array data is generated
this.png.image = new Image();
// init status object
this.status = {};
// RGB image
this.rgb = {};
// section parameters
this.rgb.sect = {zoom: 1, ozoom: 1};
// graphical layers
this.layers = {};
// current zindex for main layers
this.zlayer = JS9.SHAPEZINDEX;
// no logical coordinate systems
this.lcs = {};
// array of aux file pointers
this.aux = {};
// binning parameters
this.binning = {bin: 1, obin: 1};
// array to hold raw data as we create it (original raw data at index 0)
this.raws = [];
// initial blend mode
this.blend = {active: undefined, mode: "normal", opacity: 1};
// temp flag determines if we should update shapes at end of this call
this.updateshapes = false;
// change the cursor to show the waiting status
JS9.waiting(true, this.display);
// file argument can be an object containing raw data or
// a string containing a URL of a PNG image
switch( typeof file ){
case "object":
// save source
this.source = localOpts.source || "fits";
// generate the raw data array from the hdu
this.mkRawDataFromHDU(file,
$.extend({}, {file: file.filename}, localOpts));
// do zscale, if necessary
if( this.params.scaleclipping === "zscale" ){
this.zscale(true);
} else if( this.params.scaleclipping === "zmax" ){
this.zscale("zmax");
}
// set up initial zoom
if( this.params.zoom ){
nzoom = this.parseZoom(this.params.zoom);
this.rgb.sect.zoom = nzoom;
this.rgb.sect.ozoom = nzoom;
}
// set up initial section
this.mkSection();
// change center and zoom if necessary
sarr = mksect(this, localOpts);
if( sarr.length ){
this.mkSection.apply(this, sarr);
}
// was a static RGB file specified?
if( localOpts && localOpts.rgbFile ){
this.rgbFile = localOpts.rgbFile;
// callback to fire when static RGB image is loaded
$(this.png.image).on("load", function(){
var ss;
if( (that.png.image.width !== that.raw.width) ||
(that.png.image.height !== that.raw.height) ){
ss = sprintf("rgb dims [%s,%s] don't match image [%s,%s]",
that.png.image.width,
that.png.image.height,
that.raw.width,
that.raw.height);
JS9.error(ss);
}
// store png data in an offscreen canvas
that.mkOffScreenCanvas();
// display image, 2D graphics, etc.
that.displayImage("all", localOpts);
// finish up
finishUp.call(that, func);
}).on("error", function(){
// done loading, reset wait cursor
JS9.waiting(false);
// error on load
that.status.load = "error";
JS9.error("could not load image: "+that.id);
});
// set src to download the display file
this.png.image.src = this.rgbFile;
} else {
// display image, 2D graphics, etc.
this.displayImage("all", localOpts);
// finish up
finishUp.call(this, func);
}
break;
case "string":
// save source
this.source = localOpts.source || "fits2png";
// image or table
this.imtab = "image";
// downloaded image file, path relative to displayed Web page
this.file = JS9.cleanPath(file);
// take file but discard path (or scheme) up to slashes
this.id0 = this.file.split("/").reverse()[0];
// save id in case we have to change it for uniqueness
this.id = JS9.getImageID(this.id0, this.display.id);
// load status
this.status.load = "loading";
// callback to fire when image is loaded (do this before setting src)
$(this.png.image).on("load", function(){
// populate the image data array from RGB values
that.mkOffScreenCanvas();
// populate the raw image data array from RGB values
that.mkRawDataFromPNG();
// do zscale, if necessary
if( that.params.scaleclipping === "zscale" ){
that.zscale(true);
} else if( that.params.scaleclipping === "zmax" ){
that.zscale("zmax");
}
// set up initial zoom
if( that.params.zoom ){
nzoom = that.parseZoom(that.params.zoom);
that.rgb.sect.zoom = nzoom;
that.rgb.sect.ozoom = nzoom;
}
// set up initial section
that.mkSection();
// change center and zoom if necessary
sarr = mksect(that, localOpts);
if( sarr.length ){
that.mkSection.apply(that, sarr);
}
// display image, 2D graphics, etc.
that.displayImage("all", localOpts);
// finish up
finishUp.call(that, func);
// debugging
if( JS9.DEBUG ){
JS9.log("JS9 image: %s dims(%d,%d) min/max(%d,%d)",
that.file, that.raw.width, that.raw.height,
that.raw.dmin, that.raw.dmax);
}
}).on("error", function(){
// done loading, reset wait cursor
JS9.waiting(false);
// error on load
that.status.load = "error";
JS9.error("could not load image: "+that.id);
});
// set src to download the png and eventually display the image data
this.png.image.src = file;
break;
default:
JS9.log("unknown specification type for Load: "+ typeof file);
}
};
// return the image data in a relatively standard format
JS9.Image.prototype.getImageData = function(dflag){
var data = null;
var atob64 = function(a){
var i;
var s = '';
var bytes = new Uint8Array(a.buffer);
var len = bytes.byteLength;
for(i=0; i<len; i++){
s += String.fromCharCode(bytes[i]);
}
return window.btoa(s);
};
// return data and auxiliary info
if( dflag ){
// return an array for IPC, since python mangles the typed array
if( dflag === "array" ){
data = Array.prototype.slice.call(this.raw.data);
} else if( dflag === "base64" ){
// NB: this seems to be the fastest method for IPC!
data = atob64(this.raw.data);
} else if( dflag && (dflag !== "false") ) {
// use this for javascript programming on the web page itself
data = this.raw.data;
}
}
return {id: this.id,
file: this.file,
fits: this.fitsFile || "",
source: this.source,
imtab: this.imtab,
width: this.raw.width,
height: this.raw.height,
bitpix: this.raw.bitpix,
header: this.raw.header,
hdus: this.hdus,
data: data
};
};
// undisplay the image, release resources
JS9.Image.prototype.closeImage = function(){
var i, j, tim, key, raw, carr;
var iscurrent = false;
var ilen= JS9.images.length;
var display = this.display;
// look for the image in the image list, and remove it
for(i=0; i<ilen; i++){
if( this === JS9.images[i] ){
tim = JS9.images[i];
// is this the currently displayed image?
if( tim === tim.display.image ){
iscurrent = i+1;
}
// clear display if this is the currently displayed image
if( iscurrent ){
// nothing on the screen
tim.display.clearMessage();
tim.display.context.clear();
// clear all layers
for( key in tim.layers ){
if( tim.layers.hasOwnProperty(key) ){
// tim.layers[key].canvas.clear();
tim.showShapeLayer(key, false);
}
}
}
// plugin callbacks
tim.xeqPlugins("image", "onimageclose");
// after callbacks, we can unset the image from the display
if( iscurrent ){
// clear image from display
tim.display.image = null;
}
// remove from RGB mode, if necessary
switch(tim.cmapObj.name){
case "red":
JS9.globalOpts.rgb.rim = null;
break;
case "green":
JS9.globalOpts.rgb.gim = null;
break;
case "blue":
JS9.globalOpts.rgb.bim = null;
break;
}
// cleanup FITS file support, if necessary
if( JS9.fits.cleanupFITSFile ){
for(j=0; j<tim.raws.length; j++){
raw = tim.raws[j];
if( raw.hdu && raw.hdu.fits ){
carr = JS9.lookupVfile(raw.hdu.fits.vfile);
if( carr.length <= 1 ){
JS9.fits.cleanupFITSFile(raw.hdu.fits, true);
}
}
// free wcs info
if( raw.altwcs ){
this.freeWCS(raw);
}
}
}
// remove proxy image from server, if necessary
tim.removeProxyFile();
// good hints to the garbage collector
tim.rgb = null;
tim.offscreen = null;
tim.raw = null;
tim.colorData = null;
tim.colorCells = null;
tim.psColors = null;
tim.psInverse = null;
tim = null;
// remove image from active list
JS9.images.splice(i,1);
// found and removed the specified image
break;
}
}
// display another image, if necessary and if possible
if( iscurrent ){
iscurrent -= 2;
for(i=iscurrent; i>=0; i--){
tim = JS9.images[i];
if( display === tim.display ){
// display image, 2D graphics, etc.
tim.displayImage("all");
tim.refreshLayers();
// signal that we're done
iscurrent = JS9.images.length;
break;
}
}
for(i=JS9.images.length-1; i>iscurrent; i--){
tim = JS9.images[i];
if( display === tim.display ){
// display image, 2D graphics, etc.
tim.displayImage("all");
tim.refreshLayers();
break;
}
}
}
};
// make offscreen canvas to hold RGB data from the png file
JS9.Image.prototype.mkOffScreenCanvas = function(){
// sanity check
if( !this.png || !this.png.image ){
return this;
}
// offscreen object holds canvas into which we draw to get RGB values
// no need for jquery here, we only manipulate this via the canvas API
this.offscreen = {};
this.offscreen.canvas = document.createElement("canvas");
this.offscreen.canvas.setAttribute("width", this.png.image.width);
this.offscreen.canvas.setAttribute("height", this.png.image.height);
this.offscreen.context = this.offscreen.canvas.getContext("2d");
// turn off anti-aliasing
if( !JS9.ANTIALIAS ){
this.offscreen.context.imageSmoothingEnabled = false;
// this.offscreen.context.mozImageSmoothingEnabled = false;
this.offscreen.context.webkitImageSmoothingEnabled = false;
this.offscreen.context.msImageSmoothingEnabled = false;
}
// draw the png to the offscreen canvas
this.offscreen.context.drawImage(this.png.image, 0, 0);
// read the RGBA data from offscreen
try{
this.offscreen.img = this.offscreen.context.getImageData(0, 0,
this.png.image.width, this.png.image.height);
} catch(e){
if( JS9.CHROMEFILEWARNING &&
(JS9.BROWSER[0] === "Chrome") && (document.domain === "") ){
alert("When using the file:// URI, Chrome must be run with the --allow-file-access-from-files switch to permit JS9 to access data.");
} else {
alert("could not read off-screen image data [same-origin policy violation?]");
}
}
// allow chaining
return this;
};
// initialize keywords for various logical coordinate systems
JS9.Image.prototype.initLCS = function(iheader){
var rrot, frot;
var arr = [[0,0,0], [0,0,0], [0,0,0]];
// header usually is raw header
var header = iheader || this.raw.header;
var cx = header.CRPIX1 || 1;
var cy = header.CRPIX2 || 1;
// screen rotation angle is reversed from FITS convention
var a = -(header.CROTA2||0) * Math.PI / 180.0;
var sina = Math.sin(a);
var cosa = Math.cos(a);
// seed rotation matrix and its inverse, if necessary
if( a ){
frot = [[0,0,0], [0,0,0], [0,0,0]];
frot[0][0] = cosa;
frot[0][1] = -sina;
frot[0][2] = 0;
frot[1][0] = sina;
frot[1][1] = cosa;
frot[1][2] = 0;
rrot = JS9.invertMatrix3(frot);
if( !rrot ){
frot = null;
}
}
// physical coords
arr[0][0] = header.LTM1_1 || 1.0;
arr[1][0] = header.LTM2_1 || 0.0;
arr[0][1] = header.LTM1_2 || 0.0;
arr[1][1] = header.LTM2_2 || 1.0;
arr[2][0] = header.LTV1 || 0.0;
arr[2][1] = header.LTV2 || 0.0;
this.lcs.physical = {forward: $.extend(true, [], arr),
reverse: JS9.invertMatrix3(arr)};
if( this.lcs.physical.reverse ){
if( frot ){
this.lcs.physical.frot = $.extend(true, [], frot);
this.lcs.physical.rrot = $.extend(true, [], rrot);
// zero-index center
this.lcs.physical.cx = cx - arr[2][0] - 1;
this.lcs.physical.cy = cy - arr[2][1] - 1;
}
} else {
delete this.lcs.physical;
}
// detector coordinates
arr[0][0] = header.DTM1_1 || 1.0;
arr[1][0] = header.DTM2_1 || 0.0;
arr[0][1] = header.DTM1_2 || 0.0;
arr[1][1] = header.DTM2_2 || 1.0;
arr[2][0] = header.DTV1 || 0.0;
arr[2][1] = header.DTV2 || 0.0;
this.lcs.detector = {forward: $.extend(true, [], arr),
reverse: JS9.invertMatrix3(arr)};
if( this.lcs.detector.reverse ){
if( frot ){
this.lcs.detector.frot = $.extend(true, [], frot);
this.lcs.detector.rrot = $.extend(true, [], rrot);
// zero-index center
this.lcs.detector.cx = cx - arr[2][0] - 1;
this.lcs.detector.cy = cy - arr[2][1] - 1;
}
} else {
delete this.lcs.detector;
}
// amplifier coordinates
arr[0][0] = header.ATM1_1 || 1.0;
arr[1][0] = header.ATM2_1 || 0.0;
arr[0][1] = header.ATM1_2 || 0.0;
arr[1][1] = header.ATM2_2 || 1.0;
arr[2][0] = header.ATV1 || 0.0;
arr[2][1] = header.ATV2 || 0.0;
this.lcs.amplifier = {forward: $.extend(true, [], arr),
reverse: JS9.invertMatrix3(arr)};
if( this.lcs.amplifier.reverse ){
if( frot ){
this.lcs.amplifier.frot = $.extend(true, [], frot);
this.lcs.amplifier.rrot = $.extend(true, [], rrot);
// zero-index center
this.lcs.amplifier.cx = cx - arr[2][0] - 1;
this.lcs.amplifier.cy = cy - arr[2][1] - 1;
}
} else {
delete this.lcs.amplifier;
}
// reset lcs to image, if necessary
if( this.params && !this.lcs[this.params.lcs] ){
this.params.lcs = "image";
}
// set current, if not already done