On Aug 2, 2012, at 5:19 AM, Luís de Sousa wrote:

> I have a SparseGrid harbouring objects of assorted classes. I'd like
> to portray one of these classes with a ColourMap, like it is made with
> ValueGrid. This way each object would be portrayed with a different
> colour gradient depending on a particular attribute. Is this possible
> to do? How?

SparseGrid does not support color maps directly.  But it's easy enough to do it.  Choose or create a SimplePortrayal to display your object.  Let's say it's OvalPortrayal2D.  Then you can say:

final SimpleColorMap map = new SimpleColorMap( .......  );  // set it up like you'd like

OvalPortrayal2D oval = new OvalPortrayal2D()
	public void draw(Object object, Graphics2D graphics, DrawInfo2D info)
		MyObjectClass obj = (MyObjectClass) object;
		double val = obj.getMyAttribute();
		paint = new Color(map.getColor(val));
		super.draw(object, graphics, info);

Then just use 'oval' as your portrayal.