Add polygon outline support

Author: xiaoguzhu

Assets/Scripts/Core/Mesh/PolygonMesh.cs

@@ -18,6 +18,16 @@ public class PolygonMesh : IMeshFactory, IHitTest
         /// </summary>
         public readonly List<Vector2> texcoords;
 
+        /// <summary>
+        /// 
+        /// </summary>
+        public float lineWidth;
+
+        /// <summary>
+        /// 
+        /// </summary>
+        public Color32 lineColor;
+
         /// <summary>
         /// 
         /// </summary>
@@ -162,6 +172,53 @@ public void OnPopulateMesh(VertexBuffer vb)
 
             if (colors != null)
                 vb.RepeatColors(colors, 0, vb.currentVertCount);
+
+            if (lineWidth > 0)
+                DrawOutline(vb);
+        }
+
+        void DrawOutline(VertexBuffer vb)
+        {
+            int numVertices = points.Count;
+            int start = vb.currentVertCount - numVertices;
+            int k = vb.currentVertCount;
+            for (int i = 0; i < numVertices; i++)
+            {
+                Vector3 p0 = vb.vertices[start + i];
+                p0.y = -p0.y;
+                Vector3 p1;
+                if (i < numVertices - 1)
+                    p1 = vb.vertices[start + i + 1];
+                else
+                    p1 = vb.vertices[start];
+                p1.y = -p1.y;
+
+                Vector3 lineVector = p1 - p0;
+                Vector3 widthVector = Vector3.Cross(lineVector, new Vector3(0, 0, 1));
+                widthVector.Normalize();
+
+                vb.AddVert(p0 - widthVector * lineWidth * 0.5f, lineColor);
+                vb.AddVert(p0 + widthVector * lineWidth * 0.5f, lineColor);
+                vb.AddVert(p1 - widthVector * lineWidth * 0.5f, lineColor);
+                vb.AddVert(p1 + widthVector * lineWidth * 0.5f, lineColor);
+
+                k += 4;
+                vb.AddTriangle(k - 4, k - 3, k - 1);
+                vb.AddTriangle(k - 4, k - 1, k - 2);
+
+                //joint
+                if (i != 0)
+                {
+                    vb.AddTriangle(k - 6, k - 5, k - 3);
+                    vb.AddTriangle(k - 6, k - 3, k - 4);
+                }
+                if (i == numVertices - 1)
+                {
+                    start += numVertices;
+                    vb.AddTriangle(k - 2, k - 1, start + 1);
+                    vb.AddTriangle(k - 2, start + 1, start);
+                }
+            }
         }
 
         bool IsPointInTriangle(ref Vector2 p, ref Vector2 a, ref Vector2 b, ref Vector2 c)

Assets/Scripts/Core/Shape.cs

@@ -147,6 +147,28 @@ public void DrawPolygon(Vector2[] points, Color fillColor)
             mesh.points.AddRange(points);
             mesh.fillColor = null;
             mesh.colors = null;
+            mesh.lineWidth = 0;
+
+            graphics.color = fillColor;
+            graphics.SetMeshDirty();
+        }
+
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="points"></param>
+        /// <param name="fillColor"></param>
+        /// <param name="lineSize"></param>
+        /// <param name="lineColor"></param>
+        public void DrawPolygon(Vector2[] points, Color fillColor, float lineSize, Color lineColor)
+        {
+            PolygonMesh mesh = graphics.GetMeshFactory<PolygonMesh>();
+            mesh.points.Clear();
+            mesh.points.AddRange(points);
+            mesh.fillColor = fillColor;
+            mesh.lineWidth = lineSize;
+            mesh.lineColor = lineColor;
+            mesh.colors = null;
 
             graphics.color = fillColor;
             graphics.SetMeshDirty();
@@ -163,6 +185,7 @@ public void DrawPolygon(Vector2[] points, Color32[] colors)
             mesh.points.Clear();
             mesh.points.AddRange(points);
             mesh.fillColor = null;
+            mesh.lineWidth = 0;
             mesh.colors = colors;
 
             graphics.SetMeshDirty();

Assets/Scripts/UI/GGraph.cs

@@ -199,6 +199,21 @@ public void DrawPolygon(float aWidth, float aHeight, Vector2[] points, Color fil
             _shape.DrawPolygon(points, fillColor);
         }
 
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="aWidth"></param>
+        /// <param name="aHeight"></param>
+        /// <param name="points"></param>
+        /// <param name="fillColor"></param>
+        /// <param name="lineSize"></param>
+        /// <param name="lineColor"></param>
+        public void DrawPolygon(float aWidth, float aHeight, Vector2[] points, Color fillColor, float lineSize, Color lineColor)
+        {
+            this.SetSize(aWidth, aHeight);
+            _shape.DrawPolygon(points, fillColor, lineSize, lineColor);
+        }
+
         override public void Setup_BeforeAdd(ByteBuffer buffer, int beginPos)
         {
             base.Setup_BeforeAdd(buffer, beginPos);
@@ -235,7 +250,7 @@ override public void Setup_BeforeAdd(ByteBuffer buffer, int beginPos)
                     for (int i = 0; i < cnt; i++)
                         points[i].Set(buffer.ReadFloat(), buffer.ReadFloat());
 
-                    _shape.DrawPolygon(points, fillColor);
+                    _shape.DrawPolygon(points, fillColor, lineSize, lineColor);
                 }
                 else if (type == 4)
                 {