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Linogram development: 20070117 Update
The array feature is almost complete, perhaps entirely complete. Fully nontrivial tests are passing. For example, here is test polygon002 from the distribution:

        require "polygon";

        polygon t1(N=3), t2(N=3);

        constraints {
          t1.v[0] = (0, 0);
          t1.v[1] = (1, 1);
          t1.v[2] = (2, 3);
          t2.v[i] = t1.v[i-1];
        }

        require "point";
        require "line";

        define polygon {
          param index N;
          point v[N];
          line e[N];
          constraints {
            e[i].start = v[i];
            e[i].end = v[i+1];
          }
        }

All of the equations are rather trivial. All the difficulty is in generating the equations in the first place. The program must recognize that the variable i in the polygon definition is a dummy iterator variable, and that it is associatated with the parameter N in the polygon definition. It must propagate the specification of N to the right place, and then iterate the equations appropriately, producing something like:

e₀.end = v₀₊₁
e₁.end = v₁₊₁
e₂.end = v₂₊₁

Open figures still don't work properly. I don't think this will take too long to fix.

The code is very messy. For example, all the Type classes are in a file whose name is not Type.pm but Chunk.pm. I plan to have a round of cleanup and consolidation after the 2.0 release, which I hope will be soon.

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