osgearth setText 如何换行

liyihongcug

<label text="Draped Polygon111111111111111111111111111111111111111111111111" lat="45" long="-98"/>
如何换行？  
（实际需求：
上面行 Draped Polygon11111111111111111111111
下面行 11111111111111111111111111111ll

如果是html 《br》换行osgearth  setText 如何换行
）

提示： 这个问题必须使用js脚本来实现。 使用外挂dll 嵌套html 还真不如自己做


referrence:
文本Text

文字符号(SDK:TextSymbol)控制文本标签的存在和外观。

Property        Description
text-fill        Foreground color of the text (HTML color)
text-size        Size of the text (float, pixels)
text-font        Name of the font to use (system-dependent). For example, use “arialbd” on Windows for Arial Bold.
text-halo        Outline color of the text; Omit this propery altogether for no outline. (HTML Color)
text-halo-offset        Outline thickness (float, pixels)
text-offset-x        The x offset of the text in pixels
text-offset-y        The y offset of the text in pixels
text-align       
Alignment of the text string relative to its anchor point:
left-top
left-center
left-bottom
left-base-line
left-bottom-base-line
center-top
center-center
center-bottom
center-base-line
center-bottom-base-line
right-top
right-center
right-bottom
right-base-line
right-bottom-base-line
base-line
text-layout       
Layout of text:
ltr
rtl
vertical
text-content        The actual text string to display (string-expr)
text-encoding       
Character encoding of the text content:
utf-8
utf-16
utf-32
ascii
text-declutter        Activate decluttering for this icon. osgEarth will attempt to automatically show or hide things so they don’t overlap on the screen. (boolean)
text-occlusion-cull        Whether to occlusion cull the text so they do not display when line of sight is obstructed by terrain
text-occlusion-cull-altitude        The viewer altitude (MSL) to start occlusion culling when line of sight is obstructed by terrain

liyihongcug

box oriented
总算搞定！  这个就是弹窗功能
<model name="cities" driver="feature_geom">
        <features name="cities" driver="ogr">
            <srs>wgs84</srs>
            <geometry>
                POINT(-120 34)
            </geometry>
        </features>
        <styles>
                    <script language="javascript" profile="full">
                                   function getName2() {
                         return 'sdfsdf' + '\n' + 'sdfsdfsd';
            }
                        </script>                       
            <style type="text/css">              
                cities {
                                        icon: "../data/placemark32.png";
                                        icon-placement: centroid;
                                        icon-scale: 1.0;
                                        icon-occlusion-cull: false;
                                        icon-occlusion-cull-altitude: 8000;
                                        icon-declutter: true;               
text-align:     left_center;
                text-size:      18;
                text-declutter: true;
                text-halo:      #777;
                text-bbox-fill: #00FF0033;
                text-bbox-margin: 3;
                text-bbox-border: #FFFFFFFF;
                text-bbox-border-width: 1;
                                text-offset-x:200;               
                                        text-content:getName2();                                       
                                        altitude-offset: 100;
                                        altitude-clamping: terrain;
                                        altitude-technique: scene;
                }     
            </style>
        </styles>        
    </model>
How to add text label has multiple line
错误的text-content: "TEXT
       " + [field_2] +"
          "+ [field_19] + "\n \r \A \D" + [field_6];

liyihongcug

OSGEarth中加入大量标签时不可避免在某些视角下会出现标签遮挡的情况，一般情况下，为了规避在某个坐标区域内集中显示一堆标签，可以对不重要的标签进行裁剪不让其显示。OSGEarth中osgEarth::Symbology::IconSymbol和osgEarth::Symbology::TextSymbol等样式类中，默认就是遮挡情况下，自动裁剪的。
通常，我们在OSGEarth中增加标志时的代码如下：
//获得地图坐标系
        const osgEarth::SpatialReference* geoSRS = cOSG::earthmapNode->getMapSRS()->getGeographicSRS();


        osgEarth::Symbology::Style pm;
        //设置标志的图标
        pm.getOrCreate<osgEarth::Symbology::IconSymbol>()->url()->setLiteral(UnicodeToAscii(_ele.icopath));       
        //设置文字颜色
        pm.getOrCreate<osgEarth::Symbology::TextSymbol>()->halo() = osgEarth::Symbology::Color(_ele.color);
        //设置要显示的文字编码
        pm.getOrCreate<osgEarth::Symbology::TextSymbol>()->encoding() = osgEarth::Symbology::TextSymbol::ENCODING_UTF8;
        //设置字体
        pm.getOrCreate<osgEarth::Symbology::TextSymbol>()->font() = "simhei.ttf";
        //设置文字大小
        pm.getOrCreate<osgEarth::Symbology::TextSymbol>()->size() = _ele.size;

        //按照高程地形裁剪
        //pm.getOrCreate<osgEarth::Symbology::TextSymbol>()->occlusionCull() = true;
        //pm.getOrCreate<osgEarth::Symbology::TextSymbol>()->occlusionCullAltitude() = 10000;
        //pm.getOrCreate<osgEarth::Symbology::IconSymbol>()->occlusionCull() = true;
        //pm.getOrCreate<osgEarth::Symbology::IconSymbol>()->occlusionCullAltitude() = 10000;

        //构造节点，在地图的某个坐标点位置，构造指定字符串和指定配置的标志
        osgEarth::Annotation:laceNode* _placenode = new osgEarth::Annotation::PlaceNode(cOSG::earthmapNode, osgEarth::GeoPoint(geoSRS, _ele.position.x(), _ele.position.y()), UnicodeToUtf8(_ele.text), pm);

        addChild(_placenode);
以上代码加入到OSGEarth的位置标志，默认就带有自动遮挡裁剪的功能，如果某个坐标位置有一大堆文字标志和图标，将会自动进行遮挡裁剪，成图后效果如下：
如果我们不需要遮挡自动裁剪，则需要在代码增加两行，去掉默认设置的自动元素间的遮挡裁剪即可：
        //去掉文字和标签的密集隐藏属性
        pm.getOrCreate<osgEarth::Symbology::TextSymbol>()->declutter() = false;
        pm.getOrCreate<osgEarth::Symbology::IconSymbol>()->declutter() = false;

liyihongcug

#include <osg/Camera>
#include <osgDB/ReadFile>
#include <osgText/Font>
#include <osgText/Text>
#include <osgViewer/Viewer>
www-cnblogs-com pezy p 3868666.html
osg::ref_ptr<osgText::Font> g_font = osgText::readFontFile("fonts/arial.ttf");

osg::Camera* createHUDCamera( double left, double right, double bottom, double top )
{
    osg::ref_ptr<osg::Camera> camera = new osg::Camera;
    camera->setReferenceFrame( osg::Transform::ABSOLUTE_RF );
    camera->setClearMask( GL_DEPTH_BUFFER_BIT );
    camera->setRenderOrder( osg::Camera:OST_RENDER );
    camera->setAllowEventFocus( false );
    camera->setProjectionMatrix(
        osg::Matrix:rtho2D(left, right, bottom, top) );
    return camera.release();
}

osgText::Text* createText( const osg::Vec3& pos, const std::string& content, float size )
{
    osg::ref_ptr<osgText::Text> text = new osgText::Text;
    text->setFont( g_font.get() );
    text->setCharacterSize( size );
    text->setAxisAlignment( osgText::TextBase::XY_PLANE );
    text->setPosition( pos );
    text->setText( content );
    return text.release();
}


int main()
{
    osg::ref_ptr<osg::Geode> textGeode = new osg::Geode;
    textGeode->addDrawable( createText(
        osg::Vec3(150.0f, 500.0f, 0.0f),
        "The Cessna monoplane",
        20.0f)
        );
    textGeode->addDrawable( createText(
        osg::Vec3(150.0f, 450.0f, 0.0f),
        "Six-seat, low-wing and twin-engined",
        15.0f)
        );

    osg::Camera* camera = createHUDCamera(0, 1024, 0, 768);
    camera->addChild( textGeode.get() );
    camera->getOrCreateStateSet()->setMode(
        GL_LIGHTING, osg::StateAttribute::OFF );

    osg::ref_ptr<osg::Group> root = new osg::Group;
    root->addChild( osgDB::readNodeFile("cessna.osg") );
    root->addChild( camera );
    osgViewer::Viewer viewer;
    viewer.setUpViewInWindow(40, 40, 800, 600);
    viewer.setSceneData( root.get() );
    return viewer.run();
}