line segments - export functionality done

src/cherish/Settings.h

@@ -223,6 +223,8 @@ const int STROKE_SEGMENTS_NUMBER = 11;
 const float STROKE_FOG_MIN = 4.f;
 const float STROKE_FOG_MAX = 30.f;
 const float STROKE_MESH_RADIUS = 0.1f;
+const float SEGMENT_MESH_RADIUS = 0.2f;
+const unsigned int EXTRUSION_MESH_SHAPE = 8;
 
 // polygon settings
 const float POLYGON_LINE_WIDTH = 4.f;

src/libSGEntities/LineSegment.cpp

@@ -7,6 +7,7 @@
 #include <osg/StateSet>
 
 #include "MainWindow.h"
+#include "ParallelTransportFrame/libPTFTube/PTFTube.h"
 
 const GLenum LINESEMENT_PHANTOM_TYPE = GL_LINES;
 
@@ -56,6 +57,28 @@ void entity::LineSegment::editLastPoint(float u, float v)
     this->dirtyBound();
 }
 
+osg::Node *entity::LineSegment::getMeshRepresentation() const
+{
+    const osg::Vec3Array* vertices = static_cast<const osg::Vec3Array*>(this->getVertexArray());
+    if (!vertices){
+        qWarning("Could not extract the vertices.");
+        return nullptr;
+    }
+    std::vector<osg::Vec3f> path;
+    Q_ASSERT(vertices->size() >= 2);
+    float delta = 0.01;
+    osg::Vec3f dir = vertices->at(0)-vertices->at(1);
+    path.push_back(vertices->at(0) + dir * delta);
+    path.push_back(vertices->at(0));
+    path.push_back(vertices->at(1));
+    path.push_back(vertices->at(1) - dir * delta);
+
+    PTFTube extrusion(path, cher::SEGMENT_MESH_RADIUS, cher::EXTRUSION_MESH_SHAPE);
+    extrusion.build();
+
+    return extrusion.generateTriMesh();
+}
+
 bool entity::LineSegment::redefineToShader(osg::MatrixTransform *t)
 {
     if (!m_program) return false;

src/libSGEntities/LineSegment.h

@@ -31,6 +31,8 @@ class LineSegment : public entity::ShaderedEntity2D
 
     void editLastPoint(float u, float v);
 
+    osg::Node* getMeshRepresentation() const;
+
 protected:
     virtual bool redefineToShader(osg::MatrixTransform *t);
 

src/libSGEntities/RootScene.cpp

@@ -195,6 +195,20 @@ bool RootScene::exportSceneToFile(const std::string &name)
                 continue;
             }
         }
+        for (unsigned int j=0; j<canvas->getNumLineSegments(); ++j){
+            entity::LineSegment* segment = canvas->getLineSegment(j);
+            if (!segment) continue;
+            osg::ref_ptr<osg::Node> mesh = segment->getMeshRepresentation();
+            if (!mesh.get()){
+                qWarning("Could not obtain mesh represenation from the line segment.");
+                continue;
+            }
+            bool added = meshes.back()->addChild(mesh.get());
+            if (!added){
+                qWarning("Could not attach mesh to the mesh group.");
+                continue;
+            }
+        }
 
     }
 

src/libSGEntities/Stroke.cpp

@@ -157,7 +157,7 @@ osg::Node *entity::Stroke::getMeshRepresentation() const
         path.push_back(vertices->at(i));
     }
 
-    PTFTube extrusion(path, cher::STROKE_MESH_RADIUS, 8);
+    PTFTube extrusion(path, cher::STROKE_MESH_RADIUS, cher::EXTRUSION_MESH_SHAPE);
     extrusion.build();
 
     return extrusion.generateTriMesh();