OSG显示文字——自定义显示文字函数

#include <Windows.h>

#include <osg/Geode>

#include <osg/Geometry>

#include <osgText/Text>

#include <osgViewer/Viewer>

#include <locale.h>

#include <osgDB/ReadFile>

void setupProperties(osgText::Text& textObject,osgText::Font* font,float size,const osg::Vec3& pos )

{

 textObject.setFont(font);//

 textObject.setCharacterSize(size);//字体大小
 textObject.setPosition(pos);
 textObject.setColor(osg::Vec4(1.0,1.0,1.0,1.0));
 textObject.setAlignment(osgText::Text::CENTER_BOTTOM);//文字显示方向
 //textObject.setAxisAlignment(osgText::Text::SCREEN);//获取文字对称成方式正对屏幕方向
 //textObject.setCharacterSizeMode(osgText::Text::SCREEN_COORDS);//跟随视角不断变化，离物体越远，文字越大
 textObject.setAutoRotateToScreen(true);//跟随视角不断变化，但离物体越远，文字越小，和现实当中像类似
 textObject.setBackdropType(osgText::Text::OUTLINE);//对文字进行描边
 textObject.setBackdropColor(osg::Vec4(1.0,0.0,0.0,1.0));//描边颜色
 textObject.setDrawMode(osgText::Text::TEXT | osgText::Text::BOUNDINGBOX);//添加文字边框

 textObject.setAxisAlignment(osgText::Text::XZ_PLANE);//获取文字对称成方式

}

void createContent(osgText::Text& textObject,const char* string)

{

    int requiredSize=mbstowcs(NULL,string,0);//如果mbstowcs第一参数为NULL那么返回字符串的数目

    wchar_t* wText=new wchar_t[requiredSize+1];

    mbstowcs(wText,string,requiredSize+1);//由char转换成wchar类型

    textObject.setText(wText);

    delete wText;

}

int main()

{

    setlocale(LC_ALL,".936");//　配置地域化信息

    const char* titleString="木兰辞\n拟古决绝词简友";

    const char* textString={

        "人生若只如初见，何事秋风悲画扇；\n"

        "等闲变却故人心，却道故人心易变；\n"

        "骊山语罢倾销半，夜雨霖铃终不怨；\n"

        "何如薄幸锦衣郎，比翼连枝当日愿。"

    };

    osgText::Font* fontHei=osgText::readFontFile("C:\\WINDOWS\\Fonts\\simhei.ttf");

    osgText::Font* fontKai=osgText::readFontFile("C:\\WINDOWS\\Fonts\\simkai.ttf");

    osg::ref_ptr<osgText::Text> title=new osgText::Text;

    setupProperties(*title,fontHei,20.0f,osg::Vec3(0.0,0.0,0.0));

    createContent(*title,titleString);

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

    setupProperties(*text,fontKai,15.0,osg::Vec3(0.0,0.0,-80.0f));

    createContent(*text,textString);

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

    geode->addDrawable(osg::createTexturedQuadGeometry(osg::Vec3(-150.0,1.0,-130.0),osg::Vec3(300.0,0.0,0.0),osg::Vec3(0.0,0.0,200.0),1.0,1.0));//创建一个写字板

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

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

    osgViewer::Viewer viewer;

    viewer.setSceneData(geode.get());

    return viewer.run();    

}