Similar question.  I also have heterogeneous objects to display, but I want to render them with differing sizes.

I tried this, but it messes up the locations of the objects horribly, as if I've scaled the entire grid or something:

        final int maxOvalSize = 10;
        OvalPortrayal2D myPortrayal = new OvalPortrayal2D(Color.WHITE,  maxOvalSize) {
            @Override
            public void draw(Object object, Graphics2D graphics, DrawInfo2D drawInfo)
            {
                MyObject ob = (MyObject) object;
                double objectScale = ob.getAttribute();
                graphics.scale(objectScale, objectScale);
                super.draw(object, graphics, drawInfo);
            }
        };

On Wed, Aug 1, 2012 at 4:48 PM, Sean Luke <[log in to unmask]> wrote:
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.

Sean



--
Ph.D. Student in Computer Science
Volgenau School of Engineering
George Mason University