ecosystem.js

For drawing dynamic stimuli of various species. You can draw a picture directly, or make a category to draw instances of later. Any properties unspecified will be randomly sampled. Here's an example of the pretty pictures this script can draw (refresh the page to see the randomness).

example code:

This is the code used in ecosystem-demo.html which can be viewed here.

html:

<script src="jquery-2.0.3.min.js" type="text/javascript"></script>
<script src="raphael.js" type="text/javascript"></script>
<script src="ecosystem.js" type="text/javascript"></script>

<svg id="svgID"></svg>

js:

var scale = 0.5;
Ecosystem.draw(
	"bird", {"col1":"#ff0000",
			 "col2":"#00ff00",
			 "col3":"#0000ff",
			 "tar1":false,
			 "tar2":true,
			 "prop1":0,
			 "prop2":0},
	"svgID", scale)

This will draw a bug at half the default size (250px x 250px) with a red crest, green body, blue wing, no tail, with a short and skinny body and fat head.

You can specify all of these properties, or only some of them. You can even pass in an empty object {} if want all of the properties to be randomly sampled:

var scale = 0.5;
Ecosystem.draw("bird", {}, "svgID", scale)

You can also make categories by instantiating the Genus class with particular means and variances (any of which can be left out, in which case they will be set to defaults or randomly sampled):

var genus = new Ecosystem.Genus("bird", {
	"col1":{"mean":"#ff0000"},
	"col2":{"mean":"#00ff00"},
	"col3":{"mean":"#0000ff"},
	"tar1":0.1, //almost never has a tail
	"tar2":0.9, //almost always has a crest
	"prop1":{"mean":0, "var":0.05}, //low height variance
	"prop1":{"mean":0, "var":0.5}, //high fatness variance
	"var":0.3 //overall variance (overwritten by any specified variances)
})

Then to draw a member of this class:

//var properties = {"tar1":true, "tar2":true}
var properties = {}

genus.draw("svg2", properties, scale);

Where properties can either be an empty object or an object that specifies some or all of the properties in the first example above.

properties:

In the list below are all the properties you can specify for the critters that currenly exist. col stands for "color", prop stands for "proportion" (proportion of the way between two endpoints, e.g. fat and skinny), and tar stands for "target" (because originally these binary features were target features, though that doesn't have to be the case for your experiment).

When you instantiate a category, you pass in a means-and-variances object. When you draw a critter, you pass in a properties object. The property names (listed below) are the same for both kinds of objects (except that means-and-variances has one additional specifiable property name), but the values attached to those property names are not the same.

For example, when I want to specify a color (col1) for drawing:

genus.draw({"col1":"#ff0000"}})

But when I want to specify a category mean for col1:

genus = new Ecosystem("bird", {"col1":{"mean":"#ff0000"}})

For category colors (col1, col2, col3, col4, col5) and proportions (prop1,prop2), you can specify just a mean, just a var, or both. For category target properties (tar1, tar2), you specify a number between 0 and 1 which gives the probability within that category of having that feature. You can also specify one additional value in the means-and-vars object: var. var is a default variance, which will be overwritten if you explicitly specify a variance (like col1:{var:0.1}). Whenever there's a variance for a category and no mean, this program will randomly sample a category mean. Whenever there's a mean and no variance, I've chosen a default variance (which I think is pretty small).

flower
- col1=stem
- col2=spots
- col3=petals
- col4=center
- prop1=centersize
- prop2=petallength
- tar1=thorns
- tar2=spots
fish
- col1=body
- col2=fins
- prop1=bodysize(short->tall)
- prop2=tailsize
- tar1=fangs
- tar2=whiskers
bug
- col1=legs
- col2=head
- col3=body
- col4=antennae
- col5=wings
- prop1=headsize(small->wide)
- prop2=bodysize(narrow->fat)
- tar1=antennae
- tar2=wings
bird
- col1=crest/tail
- col2=body
- col3=wing
- prop1=height
- prop2=fatness(fat head & skinny body -> small head & fat body)
- tar1=tail
- tar2=crest
tree
- tar1=berries
- tar2=leaves
- col1=berries
- col2=leaves
- col3=trunk

Additional files

Inside concept-art directory:
- categories-fish.svg: heirarchical categories of fish for Fred Callaway's experiments in 2015. Southern fish: nikfish and hapfish (thin bodies). Northern fish: delfish and wugfish (large bodies).

erindb/stimuli

ecosystem.js

categories:

example code:

html:

js:

properties:

Additional files