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Linogram development: 20061227 Update
Defective constraints (see yesterday's article) are now handled. So the example from yesterday's article has now improved to:

        define regular_polygon[N] closed {
          param number radius, rotation=0;
          point vertex[N], center;
          line  edge[N];
          constraints {
            vertex[i] = center + radius * cis(rotation + 360*i/N);
            edge[i].start = vertex[i];
            edge[i].end   = vertex[i+1];
          }
        }

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