Handle curved geometries (line/polygon 3d symbol) and repeated vertices

qgis · Aug 10, 2017 · 81c591c17256ff0f0d839dd69d48f947e538a82e · 81c591c
1 parent b234fc5
commit 81c591c17256ff0f0d839dd69d48f947e538a82e
Unified Split

Showing with 32 additions and 12 deletions.

+7 −1 src/3d/lineentity.cpp

+7 −1 src/3d/polygonentity.cpp

+18 −10 src/3d/tessellator.cpp
diff --git a/src/3d/lineentity.cpp b/src/3d/lineentity.cpp
@@ -93,7 +93,13 @@ Qt3DRender::QGeometryRenderer *LineEntityNode::renderer( const Map3D &map, const
     if ( f.geometry().isNull() )
       continue;
 
-    QgsAbstractGeometry *g = f.geometry().geometry();
+    QgsGeometry geom = f.geometry();
+
+    // segmentize curved geometries if necessary
+    if ( QgsWkbTypes::isCurvedType( geom.geometry()->wkbType() ) )
+      geom = QgsGeometry( geom.geometry()->segmentize() );
+
+    QgsAbstractGeometry *g = geom.geometry();
 
     QgsGeos engine( g );
     QgsAbstractGeometry *buffered = engine.buffer( symbol.width / 2., nSegments, endCapStyle, joinStyle, mitreLimit ); // factory

diff --git a/src/3d/polygonentity.cpp b/src/3d/polygonentity.cpp
@@ -96,7 +96,13 @@ Qt3DRender::QGeometryRenderer *PolygonEntityNode::renderer( const Map3D &map, co
     if ( f.geometry().isNull() )
       continue;
 
-    QgsAbstractGeometry *g = f.geometry().geometry();
+    QgsGeometry geom = f.geometry();
+
+    // segmentize curved geometries if necessary
+    if ( QgsWkbTypes::isCurvedType( geom.geometry()->wkbType() ) )
+      geom = QgsGeometry( geom.geometry()->segmentize() );
+
+    QgsAbstractGeometry *g = geom.geometry();
 
     if ( QgsWkbTypes::flatType( g->wkbType() ) == QgsWkbTypes::Polygon )
     {

diff --git a/src/3d/tessellator.cpp b/src/3d/tessellator.cpp
@@ -105,15 +105,19 @@ void Tessellator::addPolygon( const QgsPolygonV2 &polygon, float extrusionHeight
   polyline.reserve( exterior->numPoints() );
 
   QgsVertexId::VertexType vt;
-  QgsPoint pt;
+  QgsPoint pt, ptPrev;
 
   for ( int i = 0; i < exterior->numPoints() - 1; ++i )
   {
     exterior->pointAt( i, pt, vt );
-    p2t::Point *pt2 = new p2t::Point( pt.x() - originX, pt.y() - originY );
-    polyline.push_back( pt2 );
-    float zPt = qIsNaN( pt.z() ) ? 0 : pt.z();
-    z[pt2] = zPt;
+    if ( i == 0 || pt != ptPrev )
+    {
+      p2t::Point *pt2 = new p2t::Point( pt.x() - originX, pt.y() - originY );
+      polyline.push_back( pt2 );
+      float zPt = qIsNaN( pt.z() ) ? 0 : pt.z();
+      z[pt2] = zPt;
+    }
+    ptPrev = pt;
   }
   polylinesToDelete << polyline;
 
@@ -128,16 +132,20 @@ void Tessellator::addPolygon( const QgsPolygonV2 &polygon, float extrusionHeight
     for ( int j = 0; j < hole->numPoints() - 1; ++j )
     {
       hole->pointAt( j, pt, vt );
-      p2t::Point *pt2 = new p2t::Point( pt.x() - originX, pt.y() - originY );
-      holePolyline.push_back( pt2 );
-      float zPt = qIsNaN( pt.z() ) ? 0 : pt.z();
-      z[pt2] = zPt;
+      if ( j == 0 || pt != ptPrev )
+      {
+        p2t::Point *pt2 = new p2t::Point( pt.x() - originX, pt.y() - originY );
+        holePolyline.push_back( pt2 );
+        float zPt = qIsNaN( pt.z() ) ? 0 : pt.z();
+        z[pt2] = zPt;
+      }
+      ptPrev = pt;
     }
     cdt->AddHole( holePolyline );
     polylinesToDelete << holePolyline;
   }
 
-  // TODO: robustness (no duplicate / nearly duplicate points, ...)
+  // TODO: robustness (no nearly duplicate points, invalid geometries ...)
 
   cdt->Triangulate();