486 lines
18 KiB
C++
486 lines
18 KiB
C++
/* OpenSceneGraph example, osgtext.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include <osg/ArgumentParser>
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#include <osg/Geode>
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#include <osg/Geometry>
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#include <osg/PositionAttitudeTransform>
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#include <osgUtil/SmoothingVisitor>
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#include <osgText/Font3D>
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#include <osgDB/WriteFile>
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#include <osgGA/StateSetManipulator>
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#include <osgUtil/Tessellator>
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#include <osgViewer/Viewer>
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#include <osgViewer/ViewerEventHandlers>
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#include <osg/io_utils>
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extern int main_orig(int, char**);
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extern int main_test(int, char**);
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class Boundary
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{
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public:
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typedef std::pair<unsigned int, unsigned int> Segment;
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typedef std::vector<Segment> Segments;
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osg::ref_ptr<osg::Vec3Array> _vertices;
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unsigned int _start;
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unsigned int _count;
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Segments _segments;
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Boundary(osg::Vec3Array* vertices, unsigned int start, unsigned int count)
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{
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_vertices = vertices;
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_start = start;
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_count = count;
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if ((*_vertices)[start]==(*_vertices)[start+count-1])
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{
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// OSG_NOTICE<<"Boundary is a line loop"<<std::endl;
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}
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else
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{
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OSG_NOTICE<<"Boundary is not a line loop"<<std::endl;
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}
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_segments.reserve(count-1);
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for(unsigned int i=start; i<start+count-2; ++i)
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{
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_segments.push_back(Segment(i,i+1));
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}
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_segments.push_back(Segment(start+count-2,start));
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}
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osg::Vec3 computeRayIntersectionPoint(const osg::Vec3& a, const osg::Vec3& an, const osg::Vec3& c, const osg::Vec3& cn)
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{
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float denominator = ( cn.x() * an.y() - cn.y() * an.x());
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if (denominator==0.0f)
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{
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//OSG_NOTICE<<"computeRayIntersectionPoint()<<denominator==0.0"<<std::endl;
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// line segments must be parallel.
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return (a+c)*0.5f;
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}
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float t = ((a.x()-c.x())*an.y() - (a.y()-c.y())*an.x()) / denominator;
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return c + cn*t;
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}
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osg::Vec3 computeIntersectionPoint(const osg::Vec3& a, const osg::Vec3& b, const osg::Vec3& c, const osg::Vec3& d)
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{
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return computeRayIntersectionPoint(a, b-a, c, d-c);
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}
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osg::Vec3 computeBisectorNormal(const osg::Vec3& a, const osg::Vec3& b, const osg::Vec3& c, const osg::Vec3& d)
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{
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osg::Vec2 ab(a.x()-b.x(), a.y()-b.y());
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osg::Vec2 dc(d.x()-c.x(), d.y()-c.y());
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/*float length_ab =*/ ab.normalize();
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/*float length_dc =*/ dc.normalize();
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float e = dc.y() - ab.y();
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float f = ab.x() - dc.x();
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float denominator = sqrtf(e*e + f*f);
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float nx = e / denominator;
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float ny = f / denominator;
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if (( ab.x()*ny - ab.y()*nx) > 0.0f)
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{
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// OSG_NOTICE<<" computeBisectorNormal(a=["<<a<<"], b=["<<b<<"], c=["<<c<<"], d=["<<d<<"]), nx="<<nx<<", ny="<<ny<<", denominator="<<denominator<<" no need to swap"<<std::endl;
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return osg::Vec3(nx,ny,0.0f);
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}
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else
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{
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OSG_NOTICE<<" computeBisectorNormal(a=["<<a<<"], b=["<<b<<"], c=["<<c<<"], d=["<<d<<"]), nx="<<nx<<", ny="<<ny<<", denominator="<<denominator<<" need to swap!!!"<<std::endl;
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return osg::Vec3(-nx,-ny,0.0f);
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}
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}
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float computeBisectorIntersectorThickness(const osg::Vec3& a, const osg::Vec3& b, const osg::Vec3& c, const osg::Vec3& d, const osg::Vec3& e, const osg::Vec3& f)
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{
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osg::Vec3 intersection_abcd = computeIntersectionPoint(a,b,c,d);
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osg::Vec3 bisector_abcd = computeBisectorNormal(a,b,c,d);
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osg::Vec3 intersection_cdef = computeIntersectionPoint(c,d,e,f);
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osg::Vec3 bisector_cdef = computeBisectorNormal(c,d,e,f);
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if (bisector_abcd==bisector_cdef)
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{
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//OSG_NOTICE<<"computeBisectorIntersector(["<<a<<"], ["<<b<<"], ["<<c<<"], ["<<d<<"], ["<<e<<"], ["<<f<<"[)"<<std::endl;
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//OSG_NOTICE<<" bisectors parallel, thickness = "<<FLT_MAX<<std::endl;
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return FLT_MAX;
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}
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osg::Vec3 bisector_intersection = computeRayIntersectionPoint(intersection_abcd,bisector_abcd, intersection_cdef, bisector_cdef);
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osg::Vec3 normal(d.y()-c.y(), c.x()-d.x(), 0.0);
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float cd_length = normal.normalize();
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if (cd_length==0)
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{
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//OSG_NOTICE<<"computeBisectorIntersector(["<<a<<"], ["<<b<<"], ["<<c<<"], ["<<d<<"], ["<<e<<"], ["<<f<<"[)"<<std::endl;
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//OSG_NOTICE<<" segment length==0, thickness = "<<FLT_MAX<<std::endl;
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return FLT_MAX;
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}
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float thickness = (bisector_intersection - c) * normal;
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#if 0
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OSG_NOTICE<<"computeBisectorIntersector(["<<a<<"], ["<<b<<"], ["<<c<<"], ["<<d<<"], ["<<e<<"], ["<<f<<"[)"<<std::endl;
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OSG_NOTICE<<" bisector_abcd = "<<bisector_abcd<<", bisector_cdef="<<bisector_cdef<<std::endl;
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OSG_NOTICE<<" bisector_intersection = "<<bisector_intersection<<", thickness = "<<thickness<<std::endl;
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#endif
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return thickness;
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}
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float computeThickness(unsigned int i)
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{
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Segment& seg_before = _segments[ (i+_segments.size()-1) % _segments.size() ];
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Segment& seg_target = _segments[ (i) % _segments.size() ];
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Segment& seg_after = _segments[ (i+1) % _segments.size() ];
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return computeBisectorIntersectorThickness(
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(*_vertices)[seg_before.first], (*_vertices)[seg_before.second],
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(*_vertices)[seg_target.first], (*_vertices)[seg_target.second],
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(*_vertices)[seg_after.first], (*_vertices)[seg_after.second]);
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}
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void computeAllThickness()
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{
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for(unsigned int i=0; i<_segments.size(); ++i)
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{
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computeThickness(i);
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}
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}
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bool findMinThickness(unsigned int& minThickness_i, float& minThickness)
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{
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minThickness_i = _segments.size();
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for(unsigned int i=0; i<_segments.size(); ++i)
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{
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float thickness = computeThickness(i);
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if (thickness>0.0 && thickness < minThickness)
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{
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minThickness = thickness;
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minThickness_i = i;
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}
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}
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return minThickness_i != _segments.size();
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}
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void removeAllSegmentsBelowThickness(float targetThickness)
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{
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// OSG_NOTICE<<"removeAllSegmentsBelowThickness("<<targetThickness<<")"<<std::endl;
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for(;;)
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{
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unsigned int minThickness_i = _segments.size();
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float minThickness = targetThickness;
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if (!findMinThickness(minThickness_i,minThickness)) break;
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// OSG_NOTICE<<" removing segment _segments["<<minThickness_i<<"] ("<<_segments[minThickness_i].first<<", "<<_segments[minThickness_i].second<<" with thickness="<<minThickness<<" "<<std::endl;
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_segments.erase(_segments.begin()+minThickness_i);
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}
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}
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osg::Vec3 computeBisectorPoint(unsigned int i, float targetThickness)
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{
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Segment& seg_before = _segments[ (i+_segments.size()-1) % _segments.size() ];
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Segment& seg_target = _segments[ (i) % _segments.size() ];
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osg::Vec3& a = (*_vertices)[seg_before.first];
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osg::Vec3& b = (*_vertices)[seg_before.second];
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osg::Vec3& c = (*_vertices)[seg_target.first];
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osg::Vec3& d = (*_vertices)[seg_target.second];
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osg::Vec3 intersection_abcd = computeIntersectionPoint(a,b,c,d);
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osg::Vec3 bisector_abcd = computeBisectorNormal(a,b,c,d);
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osg::Vec3 ab_sidevector(b.y()-a.y(), a.x()-b.x(), 0.0);
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ab_sidevector.normalize();
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float scale_factor = 1.0/ (bisector_abcd*ab_sidevector);
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osg::Vec3 new_vertex = intersection_abcd + bisector_abcd*(scale_factor*targetThickness);
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// OSG_NOTICE<<"bisector_abcd = "<<bisector_abcd<<", ab_sidevector="<<ab_sidevector<<", b-a="<<b-a<<", scale_factor="<<scale_factor<<std::endl;
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new_vertex.z() += 5.0f;
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return new_vertex;
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}
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void addBoundaryToGeometry(osg::Geometry* geometry, float targetThickness)
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{
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if (_segments.empty()) return;
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if (geometry->getVertexArray()==0) geometry->setVertexArray(new osg::Vec3Array);
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osg::Vec3Array* new_vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
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// allocate the primitive set to store the face geometry
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osg::DrawElementsUShort* face = new osg::DrawElementsUShort(GL_POLYGON);
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face->setName("face");
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// reserve enough space in the vertex array to accomodate the vertices associated with the segments
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new_vertices->reserve(new_vertices->size() + _segments.size()+1 + _count);
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// create vertices
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unsigned int previous_second = _segments[0].second;
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osg::Vec3 newPoint = computeBisectorPoint(0, targetThickness);
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unsigned int first = new_vertices->size();
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new_vertices->push_back(newPoint);
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if (_segments[0].first != _start)
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{
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//OSG_NOTICE<<"We have pruned from the start"<<std::endl;
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for(unsigned int j=_start; j<=_segments[0].first;++j)
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{
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face->push_back(first);
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}
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}
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else
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{
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face->push_back(first);
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}
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for(unsigned int i=1; i<_segments.size(); ++i)
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{
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newPoint = computeBisectorPoint(i, targetThickness);
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unsigned int vi = new_vertices->size();
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new_vertices->push_back(newPoint);
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if (previous_second != _segments[i].first)
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{
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//OSG_NOTICE<<"Gap in boundary"<<previous_second<<" to "<<_segments[i].first<<std::endl;
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for(unsigned int j=previous_second; j<=_segments[i].first;++j)
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{
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face->push_back(vi);
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}
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}
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else
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{
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face->push_back(vi);
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}
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previous_second = _segments[i].second;
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}
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// fill the end of the polygon with repititions of the first index in the polygon to ensure
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// that the orignal and new boundary polygons have the same number and pairing of indices.
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// This ensures that the bevel can be created coherently.
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while(face->size() < _count)
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{
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face->push_back(first);
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}
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// add face primitive set for polygon
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geometry->addPrimitiveSet(face);
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osg::DrawElementsUShort* bevel = new osg::DrawElementsUShort(GL_QUAD_STRIP);
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bevel->setName("bevel");
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bevel->reserve(_count*2);
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for(unsigned int i=0; i<_count; ++i)
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{
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unsigned int vi = new_vertices->size();
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new_vertices->push_back((*_vertices)[_start+i]);
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bevel->push_back(vi);
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bevel->push_back((*face)[i]);
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}
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geometry->addPrimitiveSet(bevel);
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}
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};
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osg::Geometry* getGeometryComponent(osg::Geometry* geometry, bool bevel)
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{
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osg::Vec3Array* vertices = dynamic_cast<osg::Vec3Array*>(geometry->getVertexArray());
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if (!vertices) return 0;
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osg::Geometry* new_geometry = new osg::Geometry;
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osg::Vec3Array* new_vertices = new osg::Vec3Array(*vertices);
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new_geometry->setVertexArray(new_vertices);
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for(unsigned int i=0; i<geometry->getNumPrimitiveSets(); ++i)
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{
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osg::PrimitiveSet* primitiveSet = geometry->getPrimitiveSet(i);
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if (primitiveSet->getName()=="bevel")
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{
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if (bevel) new_geometry->addPrimitiveSet(primitiveSet);
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}
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else
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{
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if (!bevel) new_geometry->addPrimitiveSet(primitiveSet);
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}
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}
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osg::Vec4Array* new_colours = new osg::Vec4Array;
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new_colours->push_back(bevel ? osg::Vec4(1.0,1.0,0.0,1.0) : osg::Vec4(1.0,0.0,0.0,1.0));
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new_geometry->setColorArray(new_colours);
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new_geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
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if (!bevel)
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{
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osg::Vec3Array* normals = new osg::Vec3Array;
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normals->push_back(osg::Vec3(0.0,0.0,1.0));
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new_geometry->setNormalArray(normals);
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new_geometry->setNormalBinding(osg::Geometry::BIND_OVERALL);
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}
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return new_geometry;
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}
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osg::Geometry* computeThickness(osg::Geometry* orig_geometry, float thickness)
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{
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// OSG_NOTICE<<"computeThickness("<<orig_geometry<<")"<<std::endl;
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osg::Vec3Array* orig_vertices = dynamic_cast<osg::Vec3Array*>(orig_geometry->getVertexArray());
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osg::Geometry::PrimitiveSetList& orig_primitives = orig_geometry->getPrimitiveSetList();
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osg::Geometry* new_geometry = new osg::Geometry;
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for(osg::Geometry::PrimitiveSetList::iterator itr = orig_primitives.begin();
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itr != orig_primitives.end();
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++itr)
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{
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osg::DrawArrays* drawArray = dynamic_cast<osg::DrawArrays*>(itr->get());
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if (drawArray && drawArray->getMode()==GL_POLYGON)
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{
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Boundary boundary(orig_vertices, drawArray->getFirst(), drawArray->getCount());
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boundary.removeAllSegmentsBelowThickness(thickness);
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boundary.addBoundaryToGeometry(new_geometry, thickness);
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}
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}
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return new_geometry;
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}
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int main(int argc, char** argv)
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{
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osg::ArgumentParser arguments(&argc, argv);
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if (arguments.read("--test"))
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{
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return main_test(argc,argv);
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}
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else if (arguments.read("--original") || arguments.read("--orig"))
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{
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return main_orig(argc,argv);
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}
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std::string fontFile("arial.ttf");
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while(arguments.read("-f",fontFile)) {}
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std::string word("This is a simple test");
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while(arguments.read("--ascii"))
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{
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word.clear();
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for(unsigned int c=' '; c<=127;++c)
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{
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word.push_back(c);
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}
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}
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while(arguments.read("-w",word)) {}
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osg::ref_ptr<osgText::Font3D> font = osgText::readFont3DFile(fontFile);
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if (!font) return 1;
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OSG_NOTICE<<"Read font "<<fontFile<<" font="<<font.get()<<std::endl;
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bool useTessellator = true;
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while(arguments.read("-t") || arguments.read("--tessellate")) { useTessellator = true; }
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while(arguments.read("--no-tessellate")) { useTessellator = false; }
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float thickness = 5.0;
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while(arguments.read("--thickness",thickness)) {}
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float creaseAngle = 10.0f;
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while(arguments.read("--crease-angle",creaseAngle)) {}
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OSG_NOTICE<<"creaseAngle="<<creaseAngle<<std::endl;
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osg::ref_ptr<osg::Group> group = new osg::Group;
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osg::Vec3 position;
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for(unsigned int i=0; i<word.size(); ++i)
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{
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osg::ref_ptr<osgText::Font3D::Glyph3D> glyph = font->getGlyph(word[i]);
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if (!glyph) return 1;
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osg::ref_ptr<osg::PositionAttitudeTransform> transform = new osg::PositionAttitudeTransform;
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transform->setPosition(position);
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transform->setAttitude(osg::Quat(osg::inDegrees(90.0),osg::Vec3d(1.0,0.0,0.0)));
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position.x() += glyph->getHorizontalWidth();
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osg::ref_ptr<osg::Geode> geode = new osg::Geode;
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osg::Vec3Array* vertices = glyph->getRawVertexArray();
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osg::Geometry::PrimitiveSetList& primitives = glyph->getRawFacePrimitiveSetList();
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osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry;
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geometry->setVertexArray(vertices);
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geometry->setPrimitiveSetList(primitives);
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osg::Vec4Array* colours = new osg::Vec4Array;
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colours->push_back(osg::Vec4(1.0,1.0,1.0,1.0));
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geometry->setColorArray(colours);
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geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
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osg::ref_ptr<osg::Geometry> face_and_bevel = computeThickness(geometry, thickness);
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osg::Geometry* bevel = getGeometryComponent(face_and_bevel, true);
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if (bevel)
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{
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geode->addDrawable(bevel);
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osgUtil::SmoothingVisitor smoother;
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smoother.setCreaseAngle(osg::DegreesToRadians(creaseAngle));
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geode->accept(smoother);
|
|
}
|
|
|
|
osg::Geometry* face = getGeometryComponent(face_and_bevel, false);
|
|
if (face) geode->addDrawable(face);
|
|
|
|
|
|
if (useTessellator)
|
|
{
|
|
if (geometry)
|
|
{
|
|
osgUtil::Tessellator ts;
|
|
ts.setWindingType(osgUtil::Tessellator::TESS_WINDING_POSITIVE);
|
|
ts.setTessellationType(osgUtil::Tessellator::TESS_TYPE_GEOMETRY);
|
|
ts.retessellatePolygons(*geometry);
|
|
}
|
|
|
|
if (face)
|
|
{
|
|
osgUtil::Tessellator ts;
|
|
ts.setWindingType(osgUtil::Tessellator::TESS_WINDING_POSITIVE);
|
|
ts.setTessellationType(osgUtil::Tessellator::TESS_TYPE_GEOMETRY);
|
|
ts.retessellatePolygons(*face);
|
|
}
|
|
|
|
}
|
|
|
|
geode->addDrawable(geometry.get());
|
|
|
|
transform->addChild(geode.get());
|
|
|
|
group->addChild(transform.get());
|
|
}
|
|
|
|
|
|
|
|
std::string filename;
|
|
if (arguments.read("-o", filename)) osgDB::writeNodeFile(*group, filename);
|
|
|
|
osgViewer::Viewer viewer(arguments);
|
|
viewer.setSceneData(group.get());
|
|
viewer.addEventHandler( new osgGA::StateSetManipulator(viewer.getCamera()->getOrCreateStateSet()) );
|
|
return viewer.run();
|
|
}
|