Add edge for given two navigation nodes */

Erase connection between given two nodes */

To find orientation of ordered triplet (p, q, r). The function returns following values 0 --> p, q and r are colinear 1 --> Clockwise 2 --> Counterclo

To find orientation of ordered triplet (p, q, r). The function returns following values 0 --> p, q and r are colinear 1 --> Clockwise 2 --> Counterclo

Delete Contour edge for given two navigation nodes */

static private functions */

Add new navigation node to global graph */

* Update Global Graph * @param vgraph current graph */

Clear nodes in global graph which is marked as merge */

Create new navigation node, and return a shared pointer to it */