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Osg-OsgEarth地图界面显示指北针(指南针)(Qt5.14.2+osgEarht3.6.5+win10)
相关资料： https://blog.csdn.net/zbf00138/article/details/52288598
实例： Compass.h  
1 #ifndef COMPASS_H
2 #define COMPASS_H
3
4 #include
5
6 #include
7 #include
8
9 #include
10 #include
11 #include
12 #include
13 #include
14 #include
15 #include
16 #include
17 #include
18
19 #include
20 #include
21
22 #include
23 #include
24
25 #include
26 #include
27 #include
28
29 class Compass : public osg::Camera
30 {
31 public:
32 Compass();
33 Compass( const Compass& copy, osg::CopyOp copyop=osg::CopyOp::SHALLOW_COPY );
34 META_Node( osg, Compass );
35
36
37 void setPlate( osg::MatrixTransform* plate ) { _plateTransform = plate; }
38 osg::MatrixTransform* getPlate() { return _plateTransform.get(); }
39 const osg::MatrixTransform* getPlate() const { return _plateTransform.get(); }
40
41
42 void setNeedle( osg::MatrixTransform* needle ) { _needleTransform = needle; }
43 osg::MatrixTransform* getNeedle() { return _needleTransform.get(); }
44 const osg::MatrixTransform* getNeedle() const { return _needleTransform.get(); }
45
46
47 void setMainCamera( osg::Camera* camera ) { _mainCamera = camera; }
48 osg::Camera* getMainCamera() { return _mainCamera.get(); }
49 const osg::Camera* getMainCamera() const { return _mainCamera.get(); }
50 void setWidthHeight(int x, int y, int width, int height){ m_xx = x; m_yy = y; m_width = width; m_height = height; };
51 virtual void traverse( osg::NodeVisitor& nv );
52
53 protected:
54 virtual ~Compass();
55 int m_width, m_height;
56 int m_x, m_y, m_xx, m_yy;
57 osg::ref_ptr _plateTransform;
58 osg::ref_ptr _needleTransform;
59 osg::observer_ptr _mainCamera;
60 };
61
62 #endif // COMPASS_H
View Code
Compass.cpp
1 #include "Compass.h"
2
3
4 Compass::Compass()
5 {
6 }
7
8 Compass::Compass( const Compass& copy, osg::CopyOp copyop )
9 : osg::Camera(copy, copyop),
10 _plateTransform(copy._plateTransform),
11 _needleTransform(copy._needleTransform),
12 _mainCamera(copy._mainCamera)
13 {
14 }
15
16 Compass::~Compass()
17 {
18 }
19
20 void Compass::traverse( osg::NodeVisitor& nv )
21 {
22 if ( _mainCamera.valid() && nv.getVisitorType()==osg::NodeVisitor::CULL_VISITOR )
23 {
24 osg::Matrix matrix = _mainCamera->getViewMatrix();
25 matrix.setTrans( osg::Vec3() );
26
27 osg::Vec3 northVec = osg::Z_AXIS * matrix;
28 northVec.z() = 0.0f;
29 northVec.normalize();
30
31 osg::Vec3 axis = osg::Y_AXIS ^ northVec;
32 float angle = atan2(axis.length(), osg::Y_AXIS*northVec);
33 axis.normalize();
34
35 if ( _plateTransform.valid() )
36 _plateTransform->setMatrix( osg::Matrix::rotate(angle, axis) );
37
38 if (m_x != _mainCamera->getViewport()->width() || _mainCamera->getViewport()->height() != m_y)
39 {
40 m_x = _mainCamera->getViewport()->width();
41 m_y = _mainCamera->getViewport()->height();
42 this->setViewport(_mainCamera->getViewport()->width()-m_width-m_xx, _mainCamera->getViewport()->height()-m_height-m_yy, m_width, m_height);
43 }
44 }
45
46
47 _plateTransform->accept( nv );
48 _needleTransform->accept( nv );
49 osg::Camera::traverse( nv );
50 }
View Code
调用
1 osg::ref_ptr compass = new Compass;
2 compass->setProjectionMatrix(osg::Matrixd::ortho(-1.5, 1.5, -1.5, 1.5, -10.0, 10.0));
3 compass->setPlate(createCompassPart("d:\\a.png", 1.5f, -1.0f)); //圆盘图片
4 compass->setNeedle(createCompassPart("d:\\b.png", 1.5f, 0.0f));//指针图片
5 compass->setWidthHeight(100,100,100,100); //起始点、宽高
6 compass->setMainCamera(m_pViewer->getCamera());
7
8 compass->setRenderOrder(osg::Camera::POST_RENDER);
9 compass->setClearMask(GL_DEPTH_BUFFER_BIT);
10 compass->setAllowEventFocus(false);
11 compass->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
12 compass->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
13 compass->getOrCreateStateSet()->setMode(GL_BLEND, osg::StateAttribute::ON);
14
15 m_pRoot->addChild(compass); //加入跟节点
View Code
createCompassPart函数
1 osg::MatrixTransform *Widget::createCompassPart(const std::string &image, float radius, float height)
2 {
3 osg::Vec3 center(-radius, -radius, height);
4 osg::ref_ptr geode = new osg::Geode;
5 geode->addDrawable(
6 createTexturedQuadGeometry(center, osg::Vec3(radius*2.0f, 0.0f, 0.0f), osg::Vec3(0.0f, radius*2.0f, 0.0f)));
7
8 osg::ref_ptr texture = new osg::Texture2D;
9 texture->setImage(osgDB::readImageFile(image));
10
11 osg::ref_ptr part = new osg::MatrixTransform;
12 part->getOrCreateStateSet()->setTextureAttributeAndModes(0, texture.get());
13 part->getOrCreateStateSet()->setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
14 part->addChild(geode.get());
15 return part.release();
16 }
View Code
作者：疯狂Delphi 出处：https://www.cnblogs.com/FKdelphi/ 本文版权归作者和博客园共有，欢迎转载，但未经作者同意必须保留此段声明，且在文章页面明显位置给出原文连接，否则保留追究法律责任的权利. 欢迎关注我，一起进步！扫描下方二维码即可加我 
posted on 2021-10-14 14:38 疯狂delphi 阅读(742) 评论(0) 编辑 收藏 举报 |
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