Initial commit

Lts/Viewer/SituationMap/MapObjects/geometry.cpp

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+/**
+  * @RDE_HEADER@
+  * Class Geometry
+  * $Id$
+  * $HeadURL$
+  * $Author$
+  */
+
+// Own
+#include "geometry.h"
+#include <cmath>
+
+//----------------------------------------------------------------------------
+namespace SituationMap
+{
+
+
+QList<QPointF> Geometry::createCircle(const QPointF &center, qreal radius, int steps)
+{
+  QList<QPointF> circle;
+  circle.reserve(steps);
+
+  if (steps < 10)
+    steps = 10;
+  for (int i = 0; i < 360; i += (360 / steps))
+  {
+    double winkel = i * M_PI / 180.0;
+    circle << (center + QPointF(cos(winkel) * radius, sin(winkel) * radius));
+  }
+  circle << circle.value(0); // 'close' the circle
+  //  circle.translate(center);
+  return circle;
+}
+
+
+QList<QPointF> Geometry::createArcSegment(const QPointF &center, qreal radius,
+                                          double startAngle_degree,
+                                          double angleOffset_clockwise_degree,
+                                          int stepsPer360)
+{
+  QList<QPointF> points;
+
+  if (stepsPer360 < 10)
+    stepsPer360 = 10;
+
+  startAngle_degree *= -1.0;
+  startAngle_degree += 90;
+
+  // normalize
+  startAngle_degree            = fmod(startAngle_degree, 360);
+  angleOffset_clockwise_degree = fmod(angleOffset_clockwise_degree, 360);
+
+  // steps
+  int steps = fabs(angleOffset_clockwise_degree) * stepsPer360 / 360;
+  points.reserve(steps + 1);
+
+  double startAngle_rad        = startAngle_degree            * M_PI / 180.0;
+  double angleOffset_right_rad = angleOffset_clockwise_degree * M_PI / 180.0;
+  for (int i = 0; i < steps; ++i)
+  {
+    //                                 '-' to go clockwise:
+    double winkel_rad = (startAngle_rad - (i * angleOffset_right_rad / steps));
+    points << (center + QPointF(cos(winkel_rad) * radius, sin(winkel_rad) * radius));
+  }
+  // calculate very last iteration (independent from 'steps'):
+  double winkel_rad = (startAngle_rad - (angleOffset_right_rad));
+  points << (center + QPointF(cos(winkel_rad) * radius, sin(winkel_rad) * radius));
+
+  return points;
+}
+
+
+
+} // namespace SituationMap
+