root/OpenSceneGraph/trunk/examples/osgfont/osgfont.cpp @ 8274

#include <cstdlib>
#include <sstream>
#include <osg/io_utils>
#include <osg/ArgumentParser>
#include <osg/Geode>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>

void textInfo(osgText::Text* text)
{
        const osgText::Text::TextureGlyphQuadMap& tgqm = text->getTextureGlyphQuadMap();

        const osgText::Text::TextureGlyphQuadMap::const_iterator tgqmi = tgqm.begin();
        
        const osgText::Text::GlyphQuads& gq = tgqmi->second;

        osgText::String& s = text->getText();

        for(unsigned int i = 0; i < s.size(); i++)
        {
                osg::Vec2 ul = gq.getCoords()[0 + (i * 4)]; // upperLeft
                osg::Vec2 ll = gq.getCoords()[1 + (i * 4)]; // lowerLeft
                osg::Vec2 lr = gq.getCoords()[2 + (i * 4)]; // lowerRight
                osg::Vec2 ur = gq.getCoords()[3 + (i * 4)]; // upperRight

                /*
                osg::Vec3 ul = gq.getTransformedCoords(0)[0 + (i * 4)];
                osg::Vec3 ll = gq.getTransformedCoords(0)[1 + (i * 4)];
                osg::Vec3 lr = gq.getTransformedCoords(0)[2 + (i * 4)];
                osg::Vec3 ur = gq.getTransformedCoords(0)[3 + (i * 4)];
                */

                osg::notify(osg::NOTICE)
                        << "'" << static_cast<char>(s[i]) << "':"
                        << " width(" << lr.x() - ll.x() << ")"
                        << " height(" << ul.y() - ll.y() << ")" << std::endl << "\t"
                        << "ul(" << ul << "), "
                        << "ll(" << ll << "), "
                        << "lr(" << lr << "), "
                        << "ur(" << ur << ")"
                        << std::endl
                ;
        }
}

osg::Camera* createOrthoCamera(double width, double height)
{
        osg::Camera* camera = new osg::Camera();

        camera->getOrCreateStateSet()->setMode(
                GL_LIGHTING,
                osg::StateAttribute::PROTECTED | osg::StateAttribute::OFF
        );

        osg::Matrix m = osg::Matrix::ortho2D(0.0f, width, 0.0f, height);

        camera->setProjectionMatrix(m);
        camera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
        camera->setViewMatrix(osg::Matrix::identity());
        camera->setClearMask(GL_DEPTH_BUFFER_BIT);
        camera->setRenderOrder(osg::Camera::POST_RENDER);
        
        return camera;
}

osgText::Text* createLabel(const std::string& l, const char* f, unsigned int size)
{
        static osg::Vec3 pos(10.0f, 10.0f, 0.0f);

        osgText::Text* label = new osgText::Text();
        osgText::Font* font  = osgText::readFontFile(f);

        label->setFont(font);
        label->setCharacterSize(size);
        label->setFontResolution(size, size);
        label->setColor(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
        label->setPosition(pos);
        label->setAlignment(osgText::Text::LEFT_BOTTOM);

        // It seems to be important we do this last to get best results?
        label->setText(l);

        textInfo(label);

        pos.y() += size + 10.0f;

        return label;
}

typedef std::list<unsigned int> Sizes;

int main(int argc, char** argv)
{
        osgViewer::Viewer   viewer;
        osg::ArgumentParser args(&argc, argv);

        // Make sure we have the minimum args...
        if(argc <= 2)
        {
                osg::notify(osg::FATAL) << "usage: " << args[0] << " FONTFILE [sizes...]" << std::endl;

                return 1;
        }

        viewer.addEventHandler(new osgViewer::StatsHandler());
        viewer.addEventHandler(new osgViewer::WindowSizeHandler());

        osg::Group*  group  = new osg::Group();
        osg::Camera* camera = createOrthoCamera(1280.0f, 1024.0f); 

        // Create the list of desired sizes.
        Sizes sizes;

        for(int i = 2; i < argc; i++)
        {
                if(!args.isNumber(i)) continue;

                sizes.push_back(std::atoi(args[i]));
        }

        osg::Geode* geode = new osg::Geode();

        // Add all of our osgText drawables.
        for(Sizes::const_iterator i = sizes.begin(); i != sizes.end(); i++)
        {
                std::stringstream ss;

                ss << *i << " 1234567890 abcdefghijklmnopqrstuvwxyz ABCDEFGHIJKLMNOPQRSTUVWXYZ";

                geode->addDrawable(createLabel(ss.str(), args[1], *i));
        }

        camera->addChild(geode);

        group->addChild(camera);

        viewer.setSceneData(group);

        return viewer.run();
}