PolyLinePlugin_BezierSpline.cc

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/*===========================================================================*\
 *                                                                           *
 *   $Revision: 17392 $                                                       *
 *   $Author: moebius $                                                      *
 *   $Date: 2013-08-26 15:03:53 +0200 (Mon, 26 Aug 2013) $                   *
 *                                                                           *
\*===========================================================================*/

//=============================================================================
//
//  CLASS PolyLinePlugin - IMPLEMENTATION
//
//=============================================================================


//== INCLUDES =================================================================

#include "PolyLinePlugin.hh"

ACG::Vec3d
PolyLinePlugin::
getPointOnMesh(PolyLineBezierSplineData* _SplineData, ACG::Vec3d _point, ACG::Vec3d* _nor)
{
        TriMeshObject* mesh;
        if(!PluginFunctions::getObject(_SplineData->meshIndex_, mesh))
                return _point;
        OpenMeshTriangleBSPT<TriMesh>* bsp = mesh->requestTriangleBsp();
        OpenMeshTriangleBSPT<TriMesh>::NearestNeighbor neigh = bsp->nearest(_point);
        ACG::Vec3d nor = mesh->mesh()->normal(neigh.handle);
        if(_nor)
                *_nor = nor;
    OpenMeshTriangleBSPT<TriMesh>::RayCollision rayInt;
        rayInt = bsp->raycollision(_point, nor);
        if(rayInt.size())
                return _point + nor * rayInt[0].second;
        return _point + nor.normalize() * neigh.dist;
}

void
PolyLinePlugin::
updatePolyBezierHandles(PolyLineObject* _lineObject, ACG::SceneGraph::LineNode* _line)
{
        PolyLineBezierSplineData* splineData = dynamic_cast<PolyLineBezierSplineData*>(_lineObject->objectData(BEZSPLINE_DATA));
        if(!splineData)
                return;
        _line->clear();
        for(unsigned int i = 0; i < splineData->handles_.size(); i++) {
                ACG::SceneGraph::GlutPrimitiveNode* node = 0;
                if(_lineObject->getAdditionalNode(node, name(), "handle", i))
                        node->set_position(splineData->handles_[i]);
                const PolyLineBezierSplineData::InterpolatePoint& control = splineData->getInterpolatePoint(i);
                _line->add_line(control.position, splineData->handles_[i]);
                _line->add_color(ACG::Vec4f(1,0,0,1));
        }
        for(unsigned int i = 0; i < splineData->points_.size(); i++) {
                ACG::SceneGraph::GlutPrimitiveNode* node = 0;
                if(_lineObject->getAdditionalNode(node, name(), "control", i))
                        node->set_position(splineData->points_[i].position);
        }
}

void
PolyLinePlugin::
updatePolyBezierSpline(PolyLineObject* _lineObject, unsigned int _pointCount)
{
        PolyLineBezierSplineData* splineData = dynamic_cast<PolyLineBezierSplineData*>(_lineObject->objectData(BEZSPLINE_DATA));
        TriMeshObject* mesh;
        if(!splineData || !PluginFunctions::getObject(splineData->meshIndex_, mesh)) {
                return;//no mesh -> do nothing
        }
        _lineObject->line()->clear();
        unsigned int segCount = (splineData->points_.size() + splineData->handles_.size() - 1) / 3;
        for(unsigned int s = 0; s < segCount; s++) {
                const ACG::Vec3d a = splineData->points_[s].position, d = splineData->points_[s + 1].position,
                                                 b = splineData->handles_[s * 2], c = splineData->handles_[s * 2 + 1];
                //the last segment will get one more point to close the spline
                unsigned int n = (s != segCount - 1) ? _pointCount : (_pointCount + 1);
                for(unsigned int i = 0; i < n; i++) {
                        float alpha = float(i) / float(_pointCount);
                        const ACG::Vec3d e = a + (b - a) * alpha, f = c + (d - c) * alpha;
                        ACG::Vec3d g = e + (f - e) * alpha;
                        g = getPointOnMesh(splineData, g);
                        _lineObject->line()->add_point(g);
                }
        }
        emit updatedObject(_lineObject->id(), UPDATE_GEOMETRY | UPDATE_TOPOLOGY);
}