Hi YangXio,
Could you have another bash at explaning what you are trying to
achieve and what problems you see as I couldn't work this out from
your original email. Screenshots would help a lot - a picture is
worth a thousand words :-)
Robert.
2008/10/7 YangXiao <[EMAIL PROTECTED]>:
> Hi
> When i run my project exe int vs2005,that's ok, But when i run outer
> it's not
> correct! I function is render a scale a graphics boudary_width and
> graphics ..
>
>
> osg::Group * createGraph(osg::Vec3Array* points,osg::Vec4Array*
> graph_color,osg::Vec4Array* boudary_color,int boudary_width,std::string
> _name)
> {
> osg::Group* trans = new osg::Group;
> osg::MatrixTransform* trans_scale = new osg::MatrixTransform;
> osg::Geode * graph = new osg::Geode;
> graph->setName(_name + "inter");
> osg::Geode * graph_scale = new osg::Geode;
> graph_scale->setName(_name + "outer");
> //得到所有点的x,y轴的包围盒
> float x_min=0,x_max=0,y_min=0,y_max=0;
> x_min = x_max = points->operator [](0).x();
> y_min = y_max = points->operator [](0).y();
> for (int i=1;i<points->size();++i)
> {
> if ((points->operator [](i).x())<x_min)
> x_min = points->operator [](i).x();
> if ((points->operator [](i).x())>x_max)
> x_max = points->operator [](i).x();
> if ((points->operator [](i).y())<y_min)
> y_min = points->operator [](i).y();
> if ((points->operator [](i).y())>y_max)
> y_max = points->operator [](i).y();
> }
> //中心点
> double x_mid = (x_min+x_max)/2;
> double y_mid = (y_min+y_max)/2;
> //得到要伸缩的比例
> double x_scale = 1+2*boudary_width/(x_max-x_min);
> double y_scale = 1+2*boudary_width/(y_max-y_min);
> //设置变换矩阵
> osg::Matrix matrix_scale;
> osg::Matrix matrix_trans;
> osg::Matrix matrix_trans1;
> matrix_scale.makeScale(osg::Vec3(x_scale,y_scale,1));
> matrix_trans.makeTranslate(-x_mid,-y_mid,0);
> matrix_trans1.makeTranslate(x_mid,y_mid,0);
> //生成几何节点 osg::Geode* graph = new osg::Geode();
> {
> //生成新的几何节点
> osg::Geometry* geometry = new osg::Geometry();
> //geometry->setName("geometry" );
> osg::Geometry* geometry_scale = new osg::Geometry();
> //geometry_scale->setName("geometry_scale");
> //设置节点的顶点
> geometry->setVertexArray(points);
> geometry_scale->setVertexArray(points);
> // 设置几何面的颜色
> geometry->setColorArray(graph_color);
> geometry->setColorBinding(osg::Geometry::BIND_OVERALL);
> geometry_scale->setColorArray(boudary_color);
> geometry_scale->setColorBinding(osg::Geometry::BIND_OVERALL);
> // 添加绘制的几何
> geometry->addPrimitiveSet(new
> osg::DrawArrays(osg::PrimitiveSet::POLYGON,0,points->size()));
> geometry_scale->addPrimitiveSet(new
> osg::DrawArrays(osg::PrimitiveSet::POLYGON,0,points->size()));
>
>
> // Setup blending
> geometry->getOrCreateStateSet()->setMode(GL_BLEND,
> osg::StateAttribute::ON);
> osg::BlendFunc *fn = new osg::BlendFunc();
> fn->setFunction(osg::BlendFunc::SRC_ALPHA,
> osg::BlendFunc::ONE_MINUS_SRC_ALPHA);
>
> geometry->getOrCreateStateSet()->setAttributeAndModes(fn,
> osg::StateAttribute::ON);
> geometry_scale->getOrCreateStateSet()->setAttributeAndModes(fn,
> osg::StateAttribute::ON);
> //设置透明属性 --透明开关打开
>
>
> geometry->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
>
> geometry_scale->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
>
> //添加到节点
> graph_scale->addDrawable(geometry_scale);
> trans_scale->addChild(graph_scale);
> osg::Matrix t = matrix_trans*matrix_scale*matrix_trans1;
> trans_scale->setMatrix(t);
> graph->addDrawable(geometry);
> trans->addChild(graph);
> trans->addChild(trans_scale);
> }
> return trans;
> }
>
> Best regards. YangXiao.
>
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>
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