C++学习（三零三）osg绘制直线 折线

Posted 2021-08-07 hankern

//绘制折线
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
_root->addChild(geode);
//设置顶点数组
osg::ref_ptr<osg::Vec3Array> vex = new osg::Vec3Array;
vex->push_back(osg::Vec3(-3.0, 0.0, 0.0));
vex->push_back(osg::Vec3(3.0, 0.0, 0.0));
vex->push_back(osg::Vec3(0.0, 5.0, 0.0));
vex->push_back(osg::Vec3(0.0, 0.0, 5.0));
osg::ref_ptr<osg::Geometry> geometry = new osg::Geometry;
geometry->setVertexArray(vex);
//设置颜色数组
osg::ref_ptr<osg::Vec4Array> colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(1.0, 1.0, 0.0, 0.5));
colors->push_back(osg::Vec4(1.0, 1.0, 0.0, 0.5));
colors->push_back(osg::Vec4(1.0, 1.0, 0.0, 0.5));
colors->push_back(osg::Vec4(1.0, 1.0, 0.0, 0.5));
geometry->setColorArray(colors);
geometry->setColorBinding(osg::Geometry::BIND_PER_VERTEX);
osg::ref_ptr<osg::PrimitiveSet> primitiveSet = new osg::DrawArrays(osg::PrimitiveSet::LINE_LOOP, 0, 4);
geometry->addPrimitiveSet(primitiveSet);
//设置线宽
osg::ref_ptr<osg::LineWidth> lw = new osg::LineWidth(6.0);
geometry->getOrCreateStateSet()->setAttribute(lw, osg::StateAttribute::ON);
geode->addDrawable(geometry);