OSG学习：自动对齐节点示例

/**********************************************************

*Write by FlySky

*zzuxp@163.com  http://www.OsgChina.org

**********************************************************/

#include <osgViewer/Viewer>

#include <osg/Node>

#include <osg/Geometry>

#include <osg/Geode>

#include <osg/Group>

#include <osg/AutoTransform>

#include <osgDB/ReadFile>

#include <osgDB/WriteFile>

#include <osgText/Text>

#include <osgUtil/Optimizer>

#include <iostream>

//创建自动变换节点

osg::ref_ptr<osg::Node> createAutoTransform(osg::Vec3& position, float size, std::string& label,

	osg::AutoTransform::AutoRotateMode autoMode, osgText::Text::AxisAlignment axisAlignment)

{

	osg::ref_ptr<osg::Geode> geode = new osg::Geode();

	//字体

	std::string font("fonts/cour.ttf");

	//创建Text对象

	osg::ref_ptr<osgText::Text> text = new osgText::Text();

	geode->addDrawable(text.get());

	//设置字体

	text->setFont(font);

	//设置字体的分辨率，默认为32*32

	text->setFontResolution(128.0f, 128.0f);

	//设置字体的大小

	text->setCharacterSize(size);

	//设置对齐方式

	text->setAlignment(osgText::Text::CENTER_CENTER);

	//设置方向

	text->setAxisAlignment(axisAlignment);

	//设置文字

	text->setText(label);

	//关闭光照

	geode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);

	//创建自动变换节点

	osg::ref_ptr<osg::AutoTransform> at = new osg::AutoTransform();

	//添加子节点

	at->addChild(geode.get());

	//设置自动变换方式

	at->setAutoRotateMode(autoMode);

	//根据屏幕大小来缩放节点，默认为false，设置为true时，节点无法缩放

	at->setAutoScaleToScreen(false);

	//at->setAutoScaleToScreen(true) ;

	//设置缩放的最大和最小比例

	at->setMinimumScale(0.0f);

	at->setMaximumScale(5.0f);

	//设置位置

	at->setPosition(position);

	return at.get();

}

int main()

{

	osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();

	osg::ref_ptr<osg::Group> root = new osg::Group();

	std::string text("Fly To Sky");

	/*

	三种变换模式：

	ROTATE_TO_SCREEN　　自动朝向屏幕

	ROTATE_TO_CAMERA	自动朝向相机

	NO_ROTATION			无

	*/

	//添加ROTATE_TO_SCEREEN模式变换节点

	root->addChild(createAutoTransform(osg::Vec3(0.0f, 0.0f, 0.0f), 60.0f, text,

		osg::AutoTransform::ROTATE_TO_SCREEN, osgText::Text::XY_PLANE));

	//添加NO_ROTATION模式变换节点

	root->addChild(createAutoTransform(osg::Vec3(0.0f, 0.0f, 0.0f), 60.0f, text,

		osg::AutoTransform::NO_ROTATION, osgText::Text::YZ_PLANE));

	//添加ROTATE_TO_CAMERA模式变换节点

	//root->addChild(createAutoTransform(osg::Vec3(0.0f,0.0f,0.0f),60.0f,text,

	//	osg::AutoTransform::ROTATE_TO_CAMERA,osgText::Text::XY_PLANE)) ;

	//优化场景数据

	osgUtil::Optimizer optimizer;

	optimizer.optimize(root.get());

	viewer->setSceneData(root.get());

	viewer->realize();

	viewer->run();

	return 0;

}
巴特西

OSG学习：自动对齐节点示例

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