Create Jarvis March_Convex Hulls_C++

Jarvis March_Convex Hulls_C++

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+//Jarvis March Convex Hull
+
+#include <iostream>
+using namespace std;
+#define INF 10000
+
+struct Point
+{
+        int x;
+        int y;
+};
+
+
+int orientation(Point p1, Point p2, Point p3)
+{
+    int val = (p2.y - p1.y) * (p3.x - p2.x) - (p2.x - p1.x) * (p3.y - p2.y);
+
+    if (val == 0)
+        return 0; // colinear
+    else if(val > 0)  
+        return 1; //clockwise
+    else
+        return 2; // counterclock wise
+}
+
+// Prints convex hull of a set of n points.
+void convexHull(Point points[], int n)
+{   
+    int i;
+
+    if (n < 3)
+        return;
+
+    // Initialize Result
+    int next[n];
+    for (i = 0; i < n; i++)
+        next[i] = -1;
+
+    // Find the leftmost point
+    int l = 0;
+    for (i = 1; i < n; i++)
+        if (points[i].x < points[l].x)
+            l = i;
+
+    int p = l, search_q;
+    do
+    {
+        search_q = (p + 1) % n;
+        for (i = 0; i < n; i++)
+            if (orientation(points[p], points[i], points[search_q]) == 2)
+                search_q = i;
+
+        next[p] = search_q;
+        p = search_q;
+    }
+    while (p != l);
+
+    // Print Result
+    for (i = 0; i < n; i++)
+    {
+        if (next[i] != -1)
+            cout << "(" << points[i].x << ", " << points[i].y << ")"<<endl;
+    }
+}
+
+// Driver program
+int main()
+{
+    Point points[] = { { 0, 3 }, { 2, 2 }, { 1, 1 }, { 2, 1 }, { 3, 0 },
+            { 0, 0 }, { 3, 3 } };
+    cout << "The points in the convex hull are: "<<endl;
+    int n= sizeof(points) / sizeof(points[0]);
+    convexHull(points, n);
+    return 0;
+}