基于OSG平台的三维饼状图实现

#include "osgHead.h" #include <osgText/Text> //创建简易四边形 osg::Geometry*CreateSimpleQuad(osg::Vec3 vecCenter,float fWidth,float fheight,osg::Vec4 vecColor) { osg::ref_ptr<osg::Geometry>geom=new osg::Geometry; osg::ref_ptr<osg::Vec3Array>v3a=new osg::Vec3Array; v3a->push_back(vecCenter+osg::Vec3(fWidth/2,fheight/2,0)); v3a->push_back(vecCenter+osg::Vec3(-fWidth/2,fheight/2,0)); v3a->push_back(vecCenter+osg::Vec3(-fWidth/2,-fheight/2,0)); v3a->push_back(vecCenter+osg::Vec3(fWidth/2,-fheight/2,0)); osg::ref_ptr<osg::Vec4Array>v4a=new osg::Vec4Array; v4a->push_back(vecColor); geom->setColorArray(v4a.get()); geom->setColorBinding(osg::Geometry::BIND_OVERALL); geom->setVertexArray(v3a.get()); geom->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUADS,0,4)); return geom.release(); } //创建屏幕平面显示的节点 osg::Geode* CreateScreenGeode(osg::Group*pGroup,int nWidth=1280,int nHeight=800) { osg::ref_ptr<osg::Geode> geode = new osg::Geode(); // turn lighting off for the text and disable depth test to ensure its always ontop. osg::StateSet* stateset = geode->getOrCreateStateSet(); stateset->setMode(GL_LIGHTING,osg::StateAttribute::OFF); // or disable depth test, and make sure that the hud is drawn after everything // else so that it always appears ontop. stateset->setMode(GL_DEPTH_TEST,osg::StateAttribute::OFF); stateset->setRenderBinDetails(12,"RenderBin"); // create the hud. osg::ref_ptr<osg::MatrixTransform> modelview_abs = new osg::MatrixTransform; modelview_abs->setReferenceFrame(osg::Transform::ABSOLUTE_RF); modelview_abs->setMatrix(osg::Matrix::identity()); modelview_abs->addChild(geode); osg::ref_ptr<osg::Projection> projection = new osg::Projection; projection->setMatrix(osg::Matrix::ortho2D(0,nWidth,0,nHeight)); projection->addChild(modelview_abs); pGroup->addChild(projection); return geode.release(); } //创建字体 osgText::Text* CreateText(std::string strText,osg::Vec3& vecPos,osg::Vec4 color=osg::Vec4(1.0,1.0,1.0,1.0),float size=20,std::string strFont=std::string("simhei.ttf"),osgText::Text::AlignmentType nAlign=osgText::Text::CENTER_BOTTOM) { setlocale(LC_ALL,"chs");//设定环境 const char* bz2=strText.c_str(); int nSize=mbstowcs(NULL,bz2,0);//字符转换 wchar_t*wbz2=new wchar_t[nSize+1]; mbstowcs(wbz2,bz2,(nSize+1)); osgText::String wText2(wbz2); delete wbz2; osg::ref_ptr<osgText::Text> text=new osgText::Text; text->setText(wText2); osg::ref_ptr<osgText::Font>font=new osgText::Font(); font=osgText::readFontFile(strFont); text->setFont(font.get()); if(size>0) text->setCharacterSize(size); //设定大小 else if(size==0) text->setCharacterSizeMode(osgText::TextBase::SCREEN_COORDS); //根据屏幕坐标自动缩放 else text->setCharacterSizeMode(osgText::TextBase::OBJECT_COORDS_WITH_MAXIMUM_SCREEN_SIZE_CAPPED_BY_FONT_HEIGHT);//根据视点自动缩放 text->setColor(color); text->setPosition(vecPos); text->setAlignment(nAlign); text->setAxisAlignment(osgText::Text::SCREEN); return text.release(); } //画扇体 osg::Node* DrawSector(osg::Vec3 vecCenter, float radius, float height, float startAngle, float endAngle, float delta,osg::Vec4 vecColor,std::string strText=std::string("")) { osg::ref_ptr<osg::Geode> geode=new osg::Geode;//扇体节点 osg::Quat qu;//扇体外移 qu.makeRotate((startAngle+endAngle)/2.0,osg::Vec3(0,0,1)); osg::Matrix ma; ma.makeRotate(qu); vecCenter+=osg::Vec3(1,0,0)*delta*ma; if (!strText.empty()) { osg::Vec3 vecText=vecCenter+osg::Vec3(1,0,0)*radius*ma*0.6+osg::Vec3(0,0,height*1.2); geode->addDrawable(CreateText(strText,vecText)); } osg::ref_ptr<osg::Vec3Array> v3Qu=new osg::Vec3Array;//记录侧边顶点 osg::ref_ptr<osg::Vec3Array>v3Tr=new osg::Vec3Array;//扇形顶点 v3Qu->push_back(vecCenter); v3Qu->push_back(vecCenter+osg::Vec3(0,0,height)); v3Tr->push_back(vecCenter+osg::Vec3(0,0,height)); float curAngle=startAngle; while(1) { osg::Vec3 down=vecCenter+osg::Vec3(radius*cos(curAngle),radius*sin(curAngle),0); osg::Vec3 top=down+osg::Vec3(0,0,height); v3Qu->push_back(down); v3Qu->push_back(top); v3Tr->push_back(top); if (endAngle>curAngle) { if(endAngle>curAngle+0.03)//小扇形顶角为0.03弧度 curAngle+=0.03; else curAngle=endAngle; } else break; } v3Qu->push_back(vecCenter); v3Qu->push_back(vecCenter+osg::Vec3(0,0,height)); osg::ref_ptr<osg::Vec4Array>v4Qu=new osg::Vec4Array; v4Qu->push_back(vecColor); osg::ref_ptr<osg::Geometry> geomQu=new osg::Geometry; geomQu->setVertexArray(v3Qu.get()); geomQu->setColorArray(v4Qu.get()); geomQu->setColorBinding(osg::Geometry::BIND_OVERALL); osg::ref_ptr<osg::Vec4Array>v4Tri=new osg::Vec4Array; v4Tri->push_back(vecColor); osg::ref_ptr<osg::Geometry>geomTri=new osg::Geometry; geomTri->setColorArray(v4Tri.get()); geomTri->setVertexArray(v3Tr.get()); geomTri->setColorBinding(osg::Geometry::BIND_OVERALL); geomQu->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::QUAD_STRIP,0,v3Qu->size())); geomTri->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::TRIANGLE_FAN,0,v3Tr->size())); osg::StateSet* stateset =new osg::StateSet; //透明属性设置 stateset->setMode(GL_BLEND,osg::StateAttribute::ON); //Alpha混合开启 stateset->setMode( GL_DEPTH_TEST, osg::StateAttribute::OFF ); //取消深度测试 stateset->setMode( GL_LIGHTING, osg::StateAttribute::OFF|osg::StateAttribute::PROTECTED ); stateset->setRenderingHint(osg::StateSet::TRANSPARENT_BIN); stateset->setRenderBinDetails(11, "RenderBin"); geomQu->setStateSet(stateset); geomTri->setStateSet(stateset); geode->addDrawable(geomQu.get()); geode->addDrawable(geomTri.get()); geode->addDescription(std::string("sector")); return geode.release(); } int main() { osg::ref_ptr<osg::Vec4Array> v4a=new osg::Vec4Array; v4a->push_back(osg::Vec4(0.8,0.0,0.0,0.7)); v4a->push_back(osg::Vec4(0.3,0.5,0.33,0.7)); v4a->push_back(osg::Vec4(0.0,0.8,0.1,0.7)); v4a->push_back(osg::Vec4(0.2,0.1,0.8,0.7)); osg::ref_ptr<osg::Group>pRoot=new osg::Group; int i=0; pRoot->addChild(DrawSector(osg::Vec3(0,0,0),100,10,0,0.4*osg::PI,5,v4a->at(i++),std::string("20.0%"))); pRoot->addChild(DrawSector(osg::Vec3(0,0,0),100,10,0.4*osg::PI,0.7*osg::PI,5,v4a->at(i++),std::string("15.0%"))); pRoot->addChild(DrawSector(osg::Vec3(0,0,0),100,10,0.7*osg::PI,1.3*osg::PI,5,v4a->at(i++),std::string("25.0%"))); pRoot->addChild(DrawSector(osg::Vec3(0,0,0),100,10,1.3*osg::PI,2.0*osg::PI,5,v4a->at(i++),std::string("35.0%"))); int nWidth=1280; int nHeight=800; int wRect=100,hRect=40; std::string strCaption[]={"第一部分","第二部分","第三部分","第四部分"}; osg::ref_ptr<osg::Geode>geoScreen=CreateScreenGeode(pRoot,nWidth,nHeight); for (i=1;i<=4;i++) { geoScreen->addDrawable(CreateSimpleQuad(osg::Vec3(20+wRect/2,nHeight-i*hRect,0),wRect,hRect*0.8,v4a->at(i-1))); geoScreen->addDrawable(CreateText(strCaption[i-1],osg::Vec3(20+wRect*1.2,nHeight-i*hRect,0),v4a->at(i-1),hRect*0.8,std::string("simhei.ttf"),osgText::Text::LEFT_CENTER)); } osgViewer::Viewer viewer; viewer.setSceneData(pRoot); viewer.setUpViewInWindow(100,100,640,500); viewer.run(); return 0; }