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* Copyright (c) 2013 Thomas Anderson <blobfish[at]gmx.com> *
* *
* This file is part of the FreeCAD CAx development system. *
* *
* This library is free software; you can redistribute it and/or *
* modify it under the terms of the GNU Library General Public *
* License as published by the Free Software Foundation; either *
* version 2 of the License, or (at your option) any later version. *
* *
* This library is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU Library General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this library; see the file COPYING.LIB. If not, *
* write to the Free Software Foundation, Inc., 59 Temple Place, *
* Suite 330, Boston, MA 02111-1307, USA *
* *
***************************************************************************/
#include "ArcEngine.h"
#include <limits>
#include <vector>
#include <Inventor/engines/SoCalculator.h>
#include <Inventor/engines/SoComposeVec3f.h>
#include <Inventor/engines/SoConcatenate.h>
#include <Inventor/engines/SoComposeRotation.h>
#include <Inventor/engines/SoComposeRotationFromTo.h>
#include <Inventor/nodekits/SoShapeKit.h>
#include <Inventor/nodes/SoCone.h>
#include <Inventor/nodes/SoFont.h>
#include <Inventor/nodes/SoLineSet.h>
#include <Inventor/nodes/SoMaterial.h>
#include <Inventor/nodes/SoMatrixTransform.h>
#include <Inventor/nodes/SoResetTransform.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoTransform.h>
#include <Inventor/nodes/SoVertexProperty.h>
using namespace Gui;
SO_ENGINE_SOURCE(ArcEngine)
ArcEngine::ArcEngine()
{
SO_ENGINE_CONSTRUCTOR(ArcEngine);
SO_ENGINE_ADD_INPUT(radius, (10.0));
SO_ENGINE_ADD_INPUT(angle, (1.0));
SO_ENGINE_ADD_INPUT(deviation, (0.25));
SO_ENGINE_ADD_OUTPUT(points, SoMFVec3f);
SO_ENGINE_ADD_OUTPUT(pointCount, SoSFInt32);
SO_ENGINE_ADD_OUTPUT(midpoint, SoSFVec3f);
}
void ArcEngine::initClass()
{
SO_ENGINE_INIT_CLASS(ArcEngine, SoEngine, "Engine");
}
void ArcEngine::evaluate()
{
float angle = abs(this->angle.getValue());
if (radius.getValue() < std::numeric_limits<float>::epsilon()
|| deviation.getValue() < std::numeric_limits<float>::epsilon()) {
defaultValues();
return;
}
float deviationAngle(acos((radius.getValue() - deviation.getValue()) / radius.getValue()));
std::vector<SbVec3f> tempPoints;
int segmentCount;
if (deviationAngle >= angle) {
segmentCount = 1;
}
else {
segmentCount = static_cast<int>(angle / deviationAngle) + 1;
if (segmentCount < 2) {
defaultValues();
return;
}
}
float angleIncrement = (this->angle.getValue() > 0 ? angle : -angle)
/ static_cast<float>(segmentCount);
for (int index = 0; index < segmentCount + 1; ++index) {
SbVec3f currentNormal(1.0, 0.0, 0.0);
float currentAngle = index * angleIncrement;
SbRotation rotation(SbVec3f(0.0, 0.0, 1.0), currentAngle);
rotation.multVec(currentNormal, currentNormal);
tempPoints.push_back(currentNormal * radius.getValue());
}
int tempCount = tempPoints.size(); // for macro.
SO_ENGINE_OUTPUT(points, SoMFVec3f, setNum(tempCount));
SO_ENGINE_OUTPUT(pointCount, SoSFInt32, setValue(tempCount));
std::vector<SbVec3f>::const_iterator it;
for (it = tempPoints.begin(); it != tempPoints.end(); ++it) {
int currentIndex = it - tempPoints.begin(); // for macro.
SbVec3f temp(*it); // for macro
SO_ENGINE_OUTPUT(points, SoMFVec3f, set1Value(currentIndex, temp));
}
// Get Midpoint
float a = angle / 2;
SbRotation rot(SbVec3f(0.0, 0.0, 1.0), a);
SbVec3f midPnt(1.0, 0.0, 0.0);
rot.multVec(midPnt, midPnt);
midPnt = midPnt * radius.getValue();
SO_ENGINE_OUTPUT(midpoint, SoSFVec3f, setValue(midPnt));
}
void ArcEngine::defaultValues()
{
// just some non-failing info.
SO_ENGINE_OUTPUT(points, SoMFVec3f, setNum(2));
SbVec3f point1(10.0, 0.0, 0.0);
SO_ENGINE_OUTPUT(points, SoMFVec3f, set1Value(0, point1));
SbVec3f point2(7.07f, 7.07f, 0.0);
SO_ENGINE_OUTPUT(points, SoMFVec3f, set1Value(1, point2));
SO_ENGINE_OUTPUT(pointCount, SoSFInt32, setValue(2));
SbVec3f point3(7.07f, 7.07f, 0.0);
SO_ENGINE_OUTPUT(midpoint, SoSFVec3f, setValue(point3));
}
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