Add convex hull example.

src/Triangle.Examples/Examples/Example1.cs

@@ -2,7 +2,6 @@
 namespace TriangleNet.Examples
 {
     using TriangleNet.Geometry;
-    using TriangleNet.Meshing;
     using TriangleNet.Meshing.Algorithm;
     using TriangleNet.Rendering.Text;
 
@@ -19,11 +18,8 @@ namespace TriangleNet.Examples
             // Choose triangulator: Incremental, SweepLine or Dwyer.
             var triangulator = new Dwyer();
 
-            // Generate a default mesher.
-            var mesher = new GenericMesher(triangulator);
-            
             // Generate mesh.
-            var mesh = mesher.Triangulate(points);
+            var mesh = triangulator.Triangulate(points, new Configuration());
 
             if (print) SvgImage.Save(mesh, "example-1.svg", 500);
 

src/Triangle.Examples/Examples/Example10.cs

@@ -9,7 +9,7 @@ namespace TriangleNet.Examples
     /// <summary>
     /// Troubleshooting: finding degenerate boundary triangles.
     /// </summary>
-    public class Example9
+    public class Example10
     {
         public static bool Run(bool print = false)
         {

src/Triangle.Examples/Examples/Example11.cs

@@ -12,7 +12,7 @@ namespace TriangleNet.Examples
     /// <summary>
     /// Scattered data interpolation without USE_Z or USE_ATTRIBS.
     /// </summary>
-    internal class Example10
+    internal class Example11
     {
         // The function we are sampling.
         private static readonly Func<Point, double> F = p => Math.Sin(p.X) * Math.Cos(p.Y);
@@ -28,7 +28,7 @@ namespace TriangleNet.Examples
             var mesh = GetScatteredDataMesh(r, out double[] data);
             //var mesh = GetStructuredDataMesh(r, out double[] data);
 
-            if (print) SvgImage.Save(mesh, "example-10.svg", 500);
+            if (print) SvgImage.Save(mesh, "example-11.svg", 500);
 
             // The points to interpolate.
             var xy = Generate.RandomPoints(50, r);
@@ -69,8 +69,8 @@ namespace TriangleNet.Examples
 
             double h = domain.Width / SIZE;
 
-            // Generate a rectangle boundary point set (20 points on each side).
+            // Generate a rectangle boundary point set (SIZE points on each side).
-            var input = Generate.Rectangle(r, 0.5);
+            var input = Generate.Rectangle(r, h);
 
             // Making sure we add some margin to the boundary.
             h = -h / 2;

src/Triangle.Examples/Examples/Example2.cs

@@ -0,0 +1,83 @@
+
+namespace TriangleNet.Examples
+{
+    using System.Collections.Generic;
+    using TriangleNet.Geometry;
+    using TriangleNet.Meshing;
+    using TriangleNet.Rendering.Text;
+
+    /// <summary>
+    /// Simple point set triangulation with convex hull.
+    /// </summary>
+    public class Example2
+    {
+        public static bool Run(bool print = false)
+        {
+            const int N = 50;
+
+            // Generate point set.
+            var points = Generate.RandomPoints(N, new Rectangle(0, 0, 100, 100));
+
+            // We use a polygon as input to enable segment insertion on the convex hull.
+            var poly = new Polygon(N);
+
+            poly.Points.AddRange(points);
+
+            // Set the 'convex' option to enclose the convex hull with segments.
+            var options = new ConstraintOptions() { Convex = true };
+
+            // Generate mesh.
+            var mesh = poly.Triangulate(options);
+
+            if (print) SvgImage.Save(mesh, "example-2.svg", 500);
+
+            return CheckConvexHull(mesh.Segments);
+        }
+
+        private static bool CheckConvexHull(IEnumerable<ISegment> segments)
+        {
+            int first = -1, prev = -1;
+
+            Point a = null, b, c;
+
+            var p = RobustPredicates.Default;
+
+            foreach (var s in segments)
+            {
+                // If first loop ...
+                if (first < 0)
+                {
+                    // initialize vertex ids of first segment and ...
+                    first = s.P1;
+                    prev = s.P0;
+
+                    // initialize first segment endpoint.
+                    a = s.GetVertex(1);
+
+                    continue;
+                }
+
+                // Check whether segments are returned in consecutive order.
+                if (prev != s.P1)
+                {
+                    return false;
+                }
+
+                b = s.GetVertex(1);
+                c = s.GetVertex(0);
+
+                // Check whether the convex hull is traversed in counterclockwise.
+                if (p.CounterClockwise(a, b, c) < 0)
+                {
+                    return false;
+                }
+
+                prev = s.P0;
+                a = b;
+            }
+
+            // Check whether the last segment connects to the first.
+            return prev == first;
+        }
+    }
+}

src/Triangle.Examples/Examples/Example3.cs

@@ -7,7 +7,7 @@
     /// <summary>
     /// Triangulate a polygon with hole and set minimum angle constraint.
     /// </summary>
-    public static class Example2
+    public static class Example3
     {
         public static bool Run(bool print = false)
         {
@@ -20,7 +20,7 @@
             // Generate mesh using the polygons Triangulate extension method.
             var mesh = poly.Triangulate(quality);
 
-            if (print) SvgImage.Save(mesh, "example-2.svg", 500);
+            if (print) SvgImage.Save(mesh, "example-3.svg", 500);
 
             return mesh.Triangles.Count > 0;
         }

src/Triangle.Examples/Examples/Example4.cs

@@ -10,14 +10,14 @@ namespace TriangleNet.Examples
     /// <summary>
     /// Triangulate a polygon with hole with maximum area constraint, followed by mesh smoothing.
     /// </summary>
-    public class Example3
+    public class Example4
     {
         public static bool Run(bool print = false)
         {
             // Generate mesh.
             var mesh = CreateMesh();
 
-            if (print) SvgImage.Save(mesh, "example-3.svg", 500);
+            if (print) SvgImage.Save(mesh, "example-4.svg", 500);
 
             return mesh.Triangles.Count > 0;
         }
@@ -25,7 +25,7 @@ namespace TriangleNet.Examples
         public static IMesh CreateMesh()
         {
             // Generate the input geometry.
-            var poly = Example2.CreatePolygon();
+            var poly = Example3.CreatePolygon();
 
             // Since we want to do CVT smoothing, ensure that the mesh
             // is conforming Delaunay.

src/Triangle.Examples/Examples/Example5.cs

@@ -10,7 +10,7 @@ namespace TriangleNet.Examples
     /// <summary>
     /// Refine only a part of a polygon mesh by using region pointers and an area constraint.
     /// </summary>
-    public class Example4
+    public class Example5
     {
         public static bool Run(bool print = false)
         {
@@ -41,7 +41,7 @@ namespace TriangleNet.Examples
 
             smoother.Smooth(mesh, 5);
 
-            if (print) SvgImage.Save(mesh, "example-4.svg", 500);
+            if (print) SvgImage.Save(mesh, "example-5.svg", 500);
 
             return mesh.Triangles.Count > 0;
         }

src/Triangle.Examples/Examples/Example6.cs

@@ -11,19 +11,19 @@ namespace TriangleNet.Examples
     /// <summary>
     /// Two ways finding boundary triangles.
     /// </summary>
-    public static class Example5
+    public static class Example6
     {
         public static bool Run(bool print = false)
         {
-            var mesh = Example3.CreateMesh();
+            var mesh = Example4.CreateMesh();
 
             FindBoundary1(mesh);
 
-            if (print) SvgImage.Save(mesh, "example-5-1.svg", 500, true, false);
+            if (print) SvgImage.Save(mesh, "example-6-1.svg", 500, true, false);
 
             FindBoundary2(mesh);
 
-            if (print) SvgImage.Save(mesh, "example-5-2.svg", 500, true, false);
+            if (print) SvgImage.Save(mesh, "example-6-2.svg", 500, true, false);
 
             return mesh.Triangles.Count > 0;
         }

src/Triangle.Examples/Examples/Example7.cs

@@ -11,7 +11,7 @@
     /// <summary>
     /// Boolean operations on mesh regions (intersection, difference, xor).
     /// </summary>
-    public static class Example6
+    public static class Example7
     {
         public static bool Run(bool print = false)
         {
@@ -28,7 +28,7 @@
             // Generate mesh.
             var mesh = (Mesh)polygon.Triangulate();
 
-            if (print) SvgImage.Save(mesh, "example-6.svg", 500);
+            if (print) SvgImage.Save(mesh, "example-7.svg", 500);
 
             // Find a seeding triangle (in this case, the point (2, 2) lies in
             // both rectangles).

src/Triangle.Examples/Examples/Example8.cs

@@ -10,7 +10,7 @@ namespace TriangleNet.Examples
     /// <summary>
     /// Using a user test function to define a maximum edge length constraint.
     /// </summary>
-    public static class Example7
+    public static class Example8
     {
         const double MAX_EDGE_LENGTH = 0.2;
 
@@ -41,7 +41,7 @@ namespace TriangleNet.Examples
                 }
             }
 
-            if (print) SvgImage.Save(mesh, "example-7.svg", 500);
+            if (print) SvgImage.Save(mesh, "example-8.svg", 500);
 
             return true;
         }

src/Triangle.Examples/Examples/Example9.cs

@@ -10,11 +10,11 @@ namespace TriangleNet.Examples
     /// <summary>
     /// Compute the adjacency matrix of the mesh vertices.
     /// </summary>
-    public class Example8
+    public class Example9
     {
         public static bool Run()
         {
-            var mesh = (Mesh)Example3.CreateMesh();
+            var mesh = (Mesh)Example4.CreateMesh();
 
             return FindAdjacencyMatrix(mesh);
         }

src/Triangle.Examples/Program.cs

@@ -18,6 +18,7 @@ namespace TriangleNet
             Check("Example  8", Example8.Run());
             Check("Example  9", Example9.Run());
             Check("Example 10", Example10.Run());
+            Check("Example 11", Example10.Run());
         }
 
         static void Check(string item, bool success)