Show line count in the details panel.

source/engine/model/line.js

@@ -22,6 +22,14 @@ export class Line
         return this;
     }
 
+    SegmentCount ()
+    {
+        if (this.vertices === null) {
+            return 0;
+        }
+        return parseInt (this.vertices.length / 2, 10);
+    }
+
     Clone ()
     {
         let cloned = new Line ([...this.vertices]);

source/engine/model/mesh.js

@@ -38,6 +38,15 @@ export class Mesh extends ModelObject3D
         return this.lines.length;
     }
 
+    LineSegmentCount ()
+    {
+        let lineSegmentCount = 0;
+        for (let line of this.lines) {
+            lineSegmentCount += line.SegmentCount ();
+        }
+        return lineSegmentCount;
+    }
+
     TriangleCount ()
     {
         return this.triangles.length;

source/engine/model/meshinstance.js

@@ -70,6 +70,11 @@ export class MeshInstance extends ModelObject3D
         return this.mesh.LineCount ();
     }
 
+    LineSegmentCount ()
+    {
+        return this.mesh.LineSegmentCount ();
+    }
+
     TriangleCount ()
     {
         return this.mesh.TriangleCount ();

source/engine/model/model.js

@@ -102,6 +102,15 @@ export class Model extends ModelObject3D
         return count;
     }
 
+    LineSegmentCount ()
+    {
+        let count = 0;
+        this.EnumerateMeshInstances ((meshInstance) => {
+            count += meshInstance.LineSegmentCount ();
+        });
+        return count;
+    }
+
     TriangleCount ()
     {
         let count = 0;

source/engine/model/object.js

@@ -25,6 +25,16 @@ export class Object3D
         return 0;
     }
 
+    LineCount ()
+    {
+        return 0;
+    }
+
+    LineSegmentCount ()
+    {
+        return 0;
+    }
+
     TriangleCount ()
     {
         return 0;

source/website/sidebardetailspanel.js

@@ -53,7 +53,14 @@ export class SidebarDetailsPanel extends SidebarPanel
         let size = SubCoord3D (boundingBox.max, boundingBox.min);
         let unit = model.GetUnit ();
         this.AddProperty (table, new Property (PropertyType.Integer, 'Vertices', object3D.VertexCount ()));
-        this.AddProperty (table, new Property (PropertyType.Integer, 'Triangles', object3D.TriangleCount ()));
+        let lineSegmentCount = object3D.LineSegmentCount ();
+        if (lineSegmentCount > 0) {
+            this.AddProperty (table, new Property (PropertyType.Integer, 'Lines', lineSegmentCount));
+        }
+        let triangleCount = object3D.TriangleCount ();
+        if (triangleCount > 0) {
+            this.AddProperty (table, new Property (PropertyType.Integer, 'Triangles', triangleCount));
+        }
         if (unit !== Unit.Unknown) {
             this.AddProperty (table, new Property (PropertyType.Text, 'Unit', UnitToString (unit)));
         }