Creating a Colormap
colorMap = [Colormap create: self];
[colorMap setColor: 0 ToName: "red"];
[colorMap setColor: 1 ToName: "blue"];
[colorMap setColor: 2 ToName: "orange"];
[colorMap setColor: 3 ToName: "black"];
Maps integer values used in simulation to color info used in display
Type is 0,1,2,3 so respective color appears
-drawSelfOn: (id) raster {
[raster drawPointX: x Y: y Color: type];