create voronoi header file

src/voronoi.c

+/*
+ * voronoi.c
+ *
+ *  Created on: 23 Nov 2018
+ *      Author: Mika
+ */
+
+#include "voronoi.h"
+
+

src/voronoi.h

+/*
+ * voronoi.h
+ *
+ *  Created on: 23 Nov 2018
+ *      Author: Mika
+ */
+
+#ifndef SRC_VORONOI_H_
+#define SRC_VORONOI_H_
+
+#include "delaunay.h"
+
+/**
+ * a vertex represented by a circle, where it is the center
+ */
+typedef struct {
+	vertex a;
+	vertex b;
+	vertex c;
+} vertexCircle;
+
+//TODO better name
+/**
+ * an edge represented by 2 vertexCircles
+ */
+typedef struct {
+	vertexCircle a;
+	vertexCircle b;
+} edgeCircle;
+
+/**
+ * returns  the  first  Voronoi  vertex  on  the  boundary  of  the Voronoi region associated with the point p e S
+ * @param point p e S
+ * @return the  first  Voronoi  vertex  on  the  boundary  of  the Voronoi region associated with p
+ */
+vertexCircle firstVoronoiVertexAssociatedWith(vertex p);
+
+/**
+ * returns  the  next  Voronoi  edge incident to e.a, following e in the clockwise direction
+ * @param e
+ * @return
+ */
+edgeCircle clockwiseNextVoronoiEdge(edgeCircle e);
+
+/**
+ * returns  the  Voronoi  edge following e along the boundary of its Voronoi region
+ * @param e
+ * @return
+ */
+edgeCircle nextVoronoiEdgeOnBoudary(edgeCircle e);
+
+
+#endif /* SRC_VORONOI_H_ */