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六、OSG学习笔记-漫游（操作器）

news 2025/2/10 22:24:27

一、实例代码操作器

Travel.h

#pragma once
#include<windows.h>
#include<osg/Node>
#include<osgViewer/Viewer>
#include<osgViewer/ViewerEventHandlers>
#include<osgDB/ReadFile>
#include<osgGA/TrackballManipulator>// 图元库
#include<osg/Geode>
#include<osg/ShapeDrawable>#include<osg/Matrix>
#include<osg/MatrixTransform>
#include<osg/PositionAttitudeTransform>// 回调
#include<osg/AnimationPath>#include<osgGA/GUIEventAdapter>
#include <osgGA/StandardManipulator>
// 自定义操作器类class TravelManipulator : public osgGA::CameraManipulator
{
public:TravelManipulator();~TravelManipulator();public:// 实现得到和设置矩阵的接口/** 设置当前视口 using a 4x4 Matrix.*/void setByMatrix(const osg::Matrixd& matrix) override;/** 设置当前视口 using a 4x4 Matrix.*/void setByInverseMatrix(const osg::Matrixd& matrix) override;/** 得到当前矩阵 4x4 Matrix.*/osg::Matrixd getMatrix() const override;/** 得到当前逆矩阵 used as a model view matrix.*/osg::Matrixd getInverseMatrix() const override;// 响应事件bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us )override;private:// 视点osg::Vec3 m_vPosition;// 朝向osg::Vec3 m_vRotation;// 移动步长int m_vStep;// 旋转步长float m_vRotateStep;
};

Travel.cpp

#include "Travel.h"
#include <osgGA/GUIEventAdapter>TravelManipulator::TravelManipulator()
{// 视点Z 值越小，模型文件越靠近放大，Z值越大，越缩小m_vPosition = osg::Vec3(0, 0, 1);m_vRotation = osg::Vec3(0, 0, 0);m_vStep = 0;m_vRotateStep = 0.0;
}TravelManipulator::~TravelManipulator()
{
}void TravelManipulator::setByMatrix(const osg::Matrixd& matrix)
{
}void TravelManipulator::setByInverseMatrix(const osg::Matrixd& matrix)
{
}osg::Matrixd TravelManipulator::getMatrix() const
{osg::Matrixd mat;mat.makeTranslate(m_vPosition);osg::Matrixd retMat = mat * osg::Matrixd::rotate(m_vRotation[0], osg::X_AXIS, m_vRotation[1],  osg::Y_AXIS, m_vRotation[2], osg::Z_AXIS);return retMat;
}osg::Matrixd TravelManipulator::getInverseMatrix() const
{osg::Matrixd mat;mat.makeTranslate(m_vPosition);osg::Matrixd retMat = mat * osg::Matrixd::rotate(m_vRotation[0], osg::X_AXIS, m_vRotation[1], osg::Y_AXIS, m_vRotation[2], osg::Z_AXIS);return osg::Matrixd::inverse(retMat);
}bool TravelManipulator::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us)
{switch (ea.getEventType()){case osgGA::GUIEventAdapter::KEYDOWN:{if (ea.getKey() == 'w'){m_vPosition[2] += 2; // 前进}else if (ea.getKey() == 's'){m_vPosition[2] -= 2; // 后退}}default:break;}return false;
}

main.cpp

#include "Travel.h"int main()
{osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;viewer->setUpViewInWindow(100, 100, 1500, 1000);osg::ref_ptr<osg::Node> node = osgDB::readNodeFile("glider.osg");viewer->setSceneData(node.get());// 加入操作器osgGA::CameraManipulator* pCameraPlator = new TravelManipulator();viewer->setCameraManipulator(pCameraPlator);return viewer->run();
}

二、漫游，操作器实例代码

代码：CuiQingCheng/OsgStudy - Gitee.com

Travel.h

#pragma once
#include<windows.h>
#include<osg/Node>
#include<osgViewer/Viewer>
#include<osgViewer/ViewerEventHandlers>
#include<osgDB/ReadFile>
#include<osgGA/TrackballManipulator>// 图元库
#include<osg/Geode>
#include<osg/ShapeDrawable>#include<osg/Matrix>
#include<osg/MatrixTransform>
#include<osg/PositionAttitudeTransform>// 回调
#include<osg/AnimationPath>#include<osgGA/GUIEventAdapter>
#include <osgGA/StandardManipulator>
// 自定义操作器类class TravelManipulator : public osgGA::CameraManipulator
{
public:TravelManipulator();~TravelManipulator();public:// 实现得到和设置矩阵的接口/** 设置当前视口 using a 4x4 Matrix.*/void setByMatrix(const osg::Matrixd& matrix) override;/** 设置当前视口 using a 4x4 Matrix.*/void setByInverseMatrix(const osg::Matrixd& matrix) override;/** 得到当前矩阵 4x4 Matrix.*/osg::Matrixd getMatrix() const override;/** 得到当前逆矩阵 used as a model view matrix.*/osg::Matrixd getInverseMatrix() const override;// 响应事件bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us )override;// 设置步长void setStep(int iStep);// 获得步长int getStep() const;// 设置到某一点void setPosition(osg::Vec3d pos);// 得到当前坐标osg::Vec3d getPosition();private:// 改变位置void ChangePosition(const osg::Vec3d& delta);private:// 视点osg::Vec3 m_vPosition;// 朝向osg::Vec3 m_vRotation;// 移动步长int m_vStep;// 旋转步长float m_vRotateStep;// 记录坐标int m_iLeftX;int m_iLeftY;bool m_bLeftDown{false};
};

Travel.cpp

#include "Travel.h"
#include <osgGA/GUIEventAdapter>TravelManipulator::TravelManipulator()
{m_vPosition = osg::Vec3(0, 0, 5);// 围绕X轴转转90度m_vRotation = osg::Vec3(osg::PI_2, 0, 0);m_vStep = 2;m_vRotateStep = 0.0;
}TravelManipulator::~TravelManipulator()
{
}void TravelManipulator::setByMatrix(const osg::Matrixd& matrix)
{
}void TravelManipulator::setByInverseMatrix(const osg::Matrixd& matrix)
{
}osg::Matrixd TravelManipulator::getMatrix() const
{osg::Matrixd mat;mat.makeTranslate(m_vPosition);osg::Matrixd retMat = osg::Matrixd::rotate(m_vRotation[0], osg::X_AXIS, m_vRotation[1],  osg::Y_AXIS, m_vRotation[2], osg::Z_AXIS) * mat;return retMat;
}osg::Matrixd TravelManipulator::getInverseMatrix() const
{osg::Matrixd mat;mat.makeTranslate(m_vPosition);osg::Matrixd retMat = osg::Matrixd::rotate(m_vRotation[0], osg::X_AXIS, m_vRotation[1], osg::Y_AXIS, m_vRotation[2], osg::Z_AXIS) * mat;return osg::Matrixd::inverse(retMat);
}bool TravelManipulator::handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& us)
{switch (ea.getEventType()){case osgGA::GUIEventAdapter::KEYDOWN:{if ((ea.getKey() == 'w') || (ea.getKey() == 'W') || (ea.getKey() == osgGA::GUIEventAdapter::KEY_Up)){osg::Vec3d delta = osg::Vec3d(m_vStep * cosf(osg::PI_2 + m_vRotation._v[2]), m_vStep * sinf(osg::PI_2 + m_vRotation._v[2]), 0);ChangePosition(delta);return true;}else if ((ea.getKey() == 's') || (ea.getKey() == 'S') || (ea.getKey() == osgGA::GUIEventAdapter::KEY_Down)){osg::Vec3d delta = osg::Vec3d(-m_vStep * cosf(osg::PI_2 + m_vRotation._v[2]), -m_vStep * sinf(osg::PI_2 + m_vRotation._v[2]), 0);ChangePosition(delta);return true;}else if ((ea.getKey() == 'a') || (ea.getKey() == 'A')){osg::Vec3d delta = osg::Vec3d(m_vStep * sinf(osg::PI_2 + m_vRotation._v[2]), m_vStep * cosf(osg::PI_2 + m_vRotation._v[2]), 0);ChangePosition(delta);return true;}else if ((ea.getKey() == 'd') || (ea.getKey() == 'D')){osg::Vec3d delta = osg::Vec3d(-m_vStep * sinf(osg::PI_2 + m_vRotation._v[2]), -m_vStep * cosf(osg::PI_2 + m_vRotation._v[2]), 0);ChangePosition(delta);return true;}else if (ea.getKey() ==  osgGA::GUIEventAdapter::KEY_Left){m_vRotation[2] += 0.2;return true;}else if (ea.getKey() == osgGA::GUIEventAdapter::KEY_Right){m_vRotation[2] -= 0.2;return true;}else if (ea.getKey() == osgGA::GUIEventAdapter::KEY_Home){ChangePosition(osg::Vec3d(0, 0, m_vStep));return true;}else if (ea.getKey() == osgGA::GUIEventAdapter::KEY_End){ChangePosition(osg::Vec3d(0, 0, -m_vStep));return true;}}break;case osgGA::GUIEventAdapter::PUSH: // 鼠标按下{if (ea.getButton() == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON){m_iLeftX = ea.getX();m_iLeftY = ea.getY();m_bLeftDown = true;}return false;}break;case osgGA::GUIEventAdapter::DRAG: // 鼠标拖动{if (m_bLeftDown){int delX = ea.getX() - m_iLeftX;m_vRotation[2] -= osg::DegreesToRadians(0.005 * delX);int delY = ea.getY() - m_iLeftY;m_vRotation[0] -= osg::DegreesToRadians(0.005 * delY);if (m_vRotation[0] > osg::PI){m_vRotation[0] = osg::PI;}else if (m_vRotation[0] < 0){m_vRotation[0] = 0;}}}break;case osgGA::GUIEventAdapter::RELEASE: // 鼠标释放{if (ea.getButton() == osgGA::GUIEventAdapter::LEFT_MOUSE_BUTTON){m_bLeftDown = false;}}break;default:break;}return false;
}void TravelManipulator::setStep(int iStep)
{m_vStep = iStep;
}int TravelManipulator::getStep() const
{return m_vStep;
}void TravelManipulator::setPosition(osg::Vec3d pos)
{m_vPosition = pos;
}osg::Vec3d TravelManipulator::getPosition()
{return m_vPosition;
}void TravelManipulator::ChangePosition(const osg::Vec3d& delta)
{m_vPosition += delta;
}

main.cpp

#include "Travel.h"
#include "../NodeMatrix/NodeMatrix.h"// 导入静态库
#ifdef _DEBUG
#pragma comment (lib, "../x64/Debug/NodeMatrix.lib")
#else
#pragma comment (lib, "../x64/Release/NodeMatrix.lib")
#endif // DEBUGint main()
{osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;viewer->setUpViewInWindow(100, 100, 1500, 1000);osg::ref_ptr<NodeMatrix> nm = new NodeMatrix;nm->addsChild(osgDB::readNodeFile("ceep.ive"));//osg::ref_ptr<osg::Node> node = osgDB::readNodeFile("ceep.ive");viewer->setSceneData(nm.get());// 加入操作器osgGA::CameraManipulator* pCameraPlator = new TravelManipulator();viewer->setCameraManipulator(pCameraPlator);return viewer->run();
}

这里静态库为前一节中矩阵变换封装的静态库；

运行效果：