Linear constraint (not fixed to horizontal/vertical)?

[joakimgk]

I have a graph consisting of different compound nodes, each of a specific shape; straight line, triangle, square, etc. The compound nodes are connected, and I want a layout tool/algorithm which is able to position the compound nodes wrt. each other, and rotate them freely, but without changing the shapes (or the ordering/labeling of the nodes). I see that Cytoscape allows constraints to be placed on nodes, but these seem to have to be defined as either horizontal or vertical, which means I don't get any rotation. Also, the ordering (1-2-3 etc) gets reordered.

I want to specify a linear constraint, which only means "these nodes in a straight line", and in the original order. The subgraph as a whole, however, should be rotated freely, to accommodate overall graph layout (edge routing between subgraphs).

Is this possible with Cytoscape?

Joakim