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