Difference between revisions of "Cross cost grid layout"
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* Perturbation threshold - real value parameter between 0 and 1 represents probability of layout perturbation during simulated annealing | * Perturbation threshold - real value parameter between 0 and 1 represents probability of layout perturbation during simulated annealing | ||
* Max distance - positive integer parameter represents maximum repulsive distance expressed in number of grid steps (if distance between two nodes exceeds Max distance then there is no repulsion between them). | * Max distance - positive integer parameter represents maximum repulsive distance expressed in number of grid steps (if distance between two nodes exceeds Max distance then there is no repulsion between them). | ||
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| + | ==See also== | ||
| + | * [[Diagram_document]] | ||
Revision as of 17:19, 14 June 2013
- Title
- Cross cost grid layout
- Class
CompartmentCrossCostGridLayouter
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This is a grid-based algorithm that considers (a) edge-edge crossings, (b) node-edge crossings, (c) node-node crossings, (d) distances between nodes in its cost function . This algorithm uses a weight matrix representing the difference between two sequentially obtained layouts for computing the costs, takes a greedy algorithm for searching locally optimal solutions and simulated annealing for global optimization.
The following parameters of the algorithm must be set:
- GridX - positive integer parameter represents horizontal grid step in pixels
- GridY - positive integer parameter represents vertical grid step in pixels
- Number of iteration - positive integer parameter represents number of iterations during same temperature in simulated annealing
- Cooling coefficient - real number between 0 and 1 represents cooling coefficient of simulated annealing (small value decrease computation time but leads to quality loss)
- Perturbation threshold - real value parameter between 0 and 1 represents probability of layout perturbation during simulated annealing
- Max distance - positive integer parameter represents maximum repulsive distance expressed in number of grid steps (if distance between two nodes exceeds Max distance then there is no repulsion between them).
