This concept is for proxy objects which get notified when a kinetic Delaunay triangulation changes.
void
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v.pre_remove_vertex ( Vertex_handle)
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The vertex is about to be deleted.
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void
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v.post_remove_vertex ( Point_key)
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The vertex was just removed.
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void
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v.pre_insert_vertex ( Point_key)
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The vertex is about to be inserted into the cell (although the Cell_handle might be NULL).
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void
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v.post_insert_vertex ( Vertex_handle)
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The vertex was just inserted.
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void
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v.change_vertex ( Vertex_handle)
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The trajectory of the point at the vertex changed.
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void
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v.create_face ( Face_handle f)
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The face has just been made.
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void
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v.destroy_face ( Face_handle f)
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The face is about to be destroyed.
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void
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v.pre_flip ( Edge)
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The edge is about to be flipped.
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void
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v.post_flip ( Edge)
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The edge was just created with a flip.
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