Folks,

I am new to MASON and learning Java as well, but a grizzled agent-based modeler. I am leaning heavily on the tutorial in the manual (Student cliques), but would be in a better place if I could reference the code from the other tutorials. Are those available?

I'm hesitant to post a basic question to a list with sparse and advanced questions, but here goes. I am seeking to add two unrelated agents to a simulation and a single dispaly. Ultimately I will build a model with several agent types and several displays.

I've adopted the language in the example, and in setupPortrayals i have included the code below (potato producers and potato distributors as agents). The code checks out, but gives a runtime "potatoDistributors cannot be cast to potatoProducers" error. Searches suggest that is because the agents differ, but I do need them to have different attributes.

I wish to add two agent types to a single display, and have them interact, such as buy and selling potatoes between them. I have searched for the code for the tutorials, but found messages on Github saying they have been removed. Are old examples available that will show me general techniques? I suspect "Asteroids" or "Keep-away Soccer" would go a long way to clarifying things for me.

Thank you for any help, and pardon if this query isn't correctly formatted,
Randy Boone


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    ContinuousPortrayal2D landPortrayal = new ContinuousPortrayal2D();
    ContinuousPortrayal2D potatoDistributorsPortrayal = new ContinuousPortrayal2D();

*************


        if (cSystem.includePotatoes == true) {
          PotatoProducers potatoProducers = (PotatoProducers) state;
          landPortrayal.setField( potatoProducers.land );
          landPortrayal.setPortrayalForAll(new MovablePortrayal2D(
                new CircledPortrayal2D(
                    new LabelledPortrayal2D(
                        new OvalPortrayal2D()
                        { public void draw(Object object, Graphics2D graphics, DrawInfo2D info)
                            { PotatoProducer potatoProducer = (PotatoProducer)object;
                            paint = new Color(0, 0, 255);
                            super.draw(object, graphics, info);
                            } }, 5.0, null, Color.black, false), 0, 5.0, Color.green, true)));
        }
        
          PotatoDistributors potatoDistributors = (PotatoDistributors) state;
          potatoDistributorsPortrayal.setField(potatoDistributors.land2);
          potatoDistributorsPortrayal.setPortrayalForAll(new MovablePortrayal2D(
                new CircledPortrayal2D(
                    new LabelledPortrayal2D(
                        new OvalPortrayal2D()
                        { public void draw(Object object, Graphics2D graphics, DrawInfo2D info)
                            { PotatoDistributor potatoDistributor = (PotatoDistributor)object;
                            paint = new Color(0, 255, 0);
                            super.draw(object, graphics, info);
                            } }, 5.0, null, Color.black, false), 0, 5.0, Color.green, true)));
        }