Initial commit

Lts/Viewer/SituationMap/MathUtils/path_rasterer.h

@@ -0,0 +1,94 @@
+/**
+**
+** @RDE_HEADER@
+** Rasterize functional path geometries to polylines
+** $Id$
+** $HeadURL$
+** $Author$
+**
+** -----------------------------------------------------------------------------------------------
+**
+** Hardware-Environment: Intel-PC
+** Software-Environment: Windows 7, Qt 5.4. ArcGIS 10.2.5
+**
+** Language ........: C++ 11
+**
+** -----------------------------------------------------------------------------------------------
+**
+** Author ...........: Jörg Turla, SPD G, Tel. 3132
+**
+** -----------------------------------------------------------------------------------------------
+**
+** Notes .........:
+**
+**   12.08.2015, JT  : First edition for use with Qt5
+**
+** -----------------------------------------------------------------------------------------------
+*/
+
+#pragma once
+
+
+#include <QtCore/QPoint>
+#include <QtCore/QVector>
+#include <QtCore/QList>
+#include <situation_map_export.h>
+
+namespace SituationMap { namespace MathUtils
+{
+
+    /**
+     @class PathRasterer path_rasterer.h
+     @brief Base class to rasterize parametric functions, like splines
+
+     Base class to rasterize parametric functions, like splines, with an interval halving method
+     to approximate the function by a discrete polyline.
+
+     @see Ellipse, Spline, SmoothLine, HermiteSpline, BezierSpline
+   */
+   class SITUATIONMAP_EXPORT PathRasterer
+   {
+      public:
+
+         PathRasterer();
+         virtual ~PathRasterer() = default;
+
+         /**
+            Defines a threshold values to decide ending convergence
+         */
+         inline void epsilon( qreal eps )               { _eps = eps;            }
+
+         /**
+            Defines the maximum of calculated verticies if \c epsilon doesn't terminate the convergence operation
+         */
+         inline void maxVertexCount(unsigned int max)   { _maxVertexCount = max; }
+
+         /**
+            Method to override to define the parametric function
+         */
+         virtual void function( qreal t, QPointF & result ) = 0;
+
+         /**
+           Creating a vertex vector with an interval halving method to approximate a parametric function by a polyline
+         */
+         void rasterize(qreal tMin, qreal tMax, QVector<QPointF> & vertexList);
+
+         void rasterize(qreal tMin, qreal tMax, QList<QPointF>   & vertexList);
+
+      protected:
+
+         qreal         _eps;
+         unsigned int  _maxVertexCount;
+
+         template<class List> void exeRasterize( qreal tMin, qreal tMax, List & vertexList );
+
+         template<class List> void splitSegment( const QPointF & v0
+                                               , qreal           t0
+                                               , const QPointF & v1
+                                               , qreal           t1
+                                               , unsigned int    maxVertexCount
+                                               , List          & vertexList );
+
+   }; /* PathRasterer */
+
+} } // namespace SituationMap::MathUtils