OSG例程(2) 碰撞检测

OSG程序设计教程，第六章漫游，矩阵操作器。

CSouth.cpp稍有不同： 

1.将判断keydown值的多个if换成了switch。

2.button拖动的旋转增量*0.001 

3.RIGHT/LEFT key的旋转增量*0.1 

CSouth.h
/************************************************************************/
/* Management Class of Manipulator                                                               */
/************************************************************************/
#pragma once
#include <osgViewer/Viewer>
#include <osgGA/MatrixManipulator>
#include <osgUtil/IntersectVisitor>
#include <osg/LineSegment>

class CSouth:public osgGA::MatrixManipulator
{
public:
    CSouth();
    ~CSouth();
private:
    
    osg::ref_ptr<osg::Node> m_node;    // node for detect collide
    unsigned int m_nID;    // camera operator
    float m_fMoveSpeed;    // move speed
    osg::Vec3 m_vPosition;    // position
    osg::Vec3 m_vRotation;    // rotation;
    bool m_bleftButtonDown;    // if the left btn is down
    float m_fpushX;         // x when left btn was down
    float m_fpushY;         // y ....
    bool m_bCollide;     // switch for detect collide

public:
    void setCollide(bool collide);
    bool getCollide();
    void setFcollide();
    
    virtual void setNode(osg::Node*);

    virtual void setByMatrix(const osg::Matrix &matrix);
    virtual void setByInverseMatrix(const osg::Matrix &matrix);
    virtual osg::Matrix getMatrix(void) const;
    virtual osg::Matrix getInverseMatrix(void) const;

    virtual bool handle(const osgGA::GUIEventAdapter &ea, osgGA::GUIActionAdapter &us);

    float m_fAngle;
    void ChangePosition(osg::Vec3 &delta);

    float getSpeed();
    void setSpeed(float);

    void SetPosition(osg::Vec3 &position);
    void SetPosition(double * );

    osg::Vec3 GetPosition();

    void computeHomePosition();
};
CSouth.cpp
/************************************************************************/
/* Management Class of Manipulator                                      */
/************************************************************************/

#include "CSouth.h"

// constructor func
CSouth::CSouth(void):m_fMoveSpeed(1.5f)
    ,m_bleftButtonDown(false)
    ,m_fpushX(0)
    ,m_fpushY(0)
    ,m_fAngle(2.5)
    ,m_bCollide(false)
{
    m_vPosition = osg::Vec3(0.0f,0.0f,5.0f);
    m_vRotation = osg::Vec3(osg::PI_2,0.0f,0.0f);
}

// destructor
CSouth::~CSouth(void)
{
}


void CSouth::setByMatrix(const osg::Matrix &matrix)
{}

void CSouth::setByInverseMatrix(const osg::Matrix &matrix)
{}

osg::Matrix CSouth::getMatrix(void) const
{
    osg::Matrix mat;
    mat.makeRotate(m_vRotation._v[0],osg::Vec3(1.0f,0.0f,0.0f),
        m_vRotation._v[1],osg::Vec3(0.0f,1.0f,0.0f),
        m_vRotation._v[2],osg::Vec3(0.0f,0.0f,1.0f) );
    return mat * osg::Matrixd::translate(m_vPosition);
}

osg::Matrix CSouth::getInverseMatrix(void) const
{
    osg::Matrix mat;
    mat.makeRotate(m_vRotation._v[0],osg::Vec3(1.0f,0.0f,0.0f),
        m_vRotation._v[1],osg::Vec3(0.0f,1.0f,0.0f),
        m_vRotation._v[2],osg::Vec3(0.0f,0.0f,1.0f) );
    return osg::Matrixd::inverse( mat * osg::Matrixd::translate(m_vPosition) );
}

bool CSouth::handle(const osgGA::GUIEventAdapter &ea
    , osgGA::GUIActionAdapter &us)
{
    float mouseX = ea.getX();
    float mouseY = ea.getY();

    switch (ea.getEventType())
    {
        // keydown event
    case (osgGA::GUIEventAdapter::KEYDOWN):
        {
            switch (ea.getKey())
            {
            case (0x20):    // SPACE
                // redraw
                us.requestRedraw();
                us.requestContinuousUpdate(false);
                return true;
            case (0xFF50):    // HOME
                ChangePosition(osg::Vec3(0,0,m_fMoveSpeed));
                return true;
            case (0xFF57):    // END
                ChangePosition(osg::Vec3(0,0,-m_fMoveSpeed));
                return true;
            case (0x2B):    // +
                m_fMoveSpeed += 1.0f;
                return true;
            case (0x50):    // -
                m_fMoveSpeed -= 1.0f;
                if (m_fMoveSpeed < 1.0f)
                {
                    m_fMoveSpeed = 1.0f;
                }
                return true;
            case (0xFF52):    // UP
            case (0x57):    // W
            case (0x77):    // w
                ChangePosition( osg::Vec3(0 , m_fMoveSpeed*sinf(osg::PI_2 + m_vRotation._v[2]) , 0 ) );
                ChangePosition( osg::Vec3( m_fMoveSpeed*cosf(osg::PI_2 + m_vRotation._v[2]), 0 , 0 ) );
                return true;
            case (0xFF54):    // DOWN
            case (0x53):    // S
            case (0x73):    // s
                ChangePosition( osg::Vec3(0 , -m_fMoveSpeed*sinf(osg::PI_2 + m_vRotation._v[2]) , 0 ) );
                ChangePosition( osg::Vec3( -m_fMoveSpeed*cosf(osg::PI_2 + m_vRotation._v[2]), 0 , 0 ) );
                return true;
            case (0x61):    // a
            case (0x41):    // A
                ChangePosition( osg::Vec3(0 , m_fMoveSpeed*cosf(osg::PI_2 + m_vRotation._v[2]) , 0 ) );
                ChangePosition( osg::Vec3( -m_fMoveSpeed*sinf(osg::PI_2 + m_vRotation._v[2]), 0 , 0 ) );
                return true;
            case (0x64):    // d
            case (0x44):    // D
                ChangePosition( osg::Vec3(0 , -m_fMoveSpeed*cosf(osg::PI_2 + m_vRotation._v[2]) , 0 ) );
                ChangePosition( osg::Vec3( m_fMoveSpeed*sinf(osg::PI_2 + m_vRotation._v[2]), 0 , 0 ) );
                return true;
            case (0xFF53):    // ->RIGHT
                m_vRotation._v[2] -= osg::DegreesToRadians(m_fAngle*0.1);
                return true;
            case (0xFF51):    // <-LEFT
                m_vRotation._v[2] += osg::DegreesToRadians(m_fAngle*0.1);
                return true;
            case (0x66):    // f
            case (0x46):    // F
                computeHomePosition();
                m_fAngle -=0.2;
                return true;
            case (0x67):    // g
            case (0x47):    // G
                m_fAngle +=0.2;
                return true;
            default:
                return false;
            }
        }
    case (osgGA::GUIEventAdapter::PUSH):
        // left button
        if (ea.getButton() == 1)
        {
            m_fpushX = mouseX;
            m_fpushY = mouseY;
            m_bleftButtonDown = true;
        }
        return false;
    case (osgGA::GUIEventAdapter::DRAG):
        if (m_bleftButtonDown)
        {
            m_vRotation._v[2] -= osg::DegreesToRadians(m_fAngle * (mouseX - m_fpushX)* 0.001);
            m_vRotation._v[0] += osg::DegreesToRadians(1.1 * (mouseY - m_fpushY)* 0.001);
            if (m_vPosition._v[0] >=3.14)
                m_vPosition._v[0] = 3.14;
            if (m_vPosition._v[0] <= 0)
                m_vPosition._v[0] = 0;
        }
        return false;
    case (osgGA::GUIEventAdapter::RELEASE):
        // left button
        if (ea.getButton()==1)
        {
            m_bleftButtonDown = false;
        }
        return false;
    default:
        return false;
    }
}

void CSouth::ChangePosition(osg::Vec3 &delta)
{
    if (m_bCollide)
    {
        osg::Vec3 newPos = m_vPosition + delta;
        osgUtil::IntersectVisitor iv;
        osg::ref_ptr<osg::LineSegment> line = new osg::LineSegment(newPos, m_vPosition);
        osg::ref_ptr<osg::LineSegment> lineZ = new osg::LineSegment(newPos + osg::Vec3(0.0f,0.0f, m_fMoveSpeed),
            newPos - osg::Vec3(0.0f,0.0f, m_fMoveSpeed));
        iv.addLineSegment(lineZ.get());
        iv.addLineSegment(line.get());
        m_node->accept(iv);
        if (!iv.hits())
        {
            m_vPosition += delta;
        }
    }
    else
        m_vPosition += delta;
}

float CSouth::getSpeed()
{
    return m_fMoveSpeed;
}

void CSouth::setSpeed(float sp)
{
    m_fMoveSpeed = sp;
}

void CSouth::SetPosition(osg::Vec3 &position)
{
    m_vPosition = position;
}
void CSouth::SetPosition(double * position)
{
    m_vPosition._v[0] = position[0];
    m_vPosition._v[1] = position[1];
    m_vPosition._v[2] = position[2];
}

osg::Vec3 CSouth::GetPosition()
{
    return m_vPosition;
}

void CSouth::setNode(osg::Node * node)
{
    m_node = node;
}

void CSouth::computeHomePosition()
{
    if (m_node.get())
    {
        const osg::BoundingSphere &boudingSphere = m_node -> getBound();
        osg::Vec3 bp = boudingSphere._center;
        SetPosition(bp);
    }
}

void CSouth::setCollide(bool collide)
{
    m_bCollide = collide;
}

bool CSouth::getCollide()
{
    return m_bCollide;
}

void CSouth::setFcollide()
{
    m_bCollide = !m_bCollide;
}

  

main.cpp
#include <osgDB/ReadFile>
#include <osgViewer/Viewer>
#include <osg/Node>
#include "CSouth.h"

int main()
{

    osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer();

    viewer->setSceneData(osgDB::readNodeFile("..\\ceep.ive"));

    viewer->setCameraManipulator(new CSouth());

    viewer->realize();
    viewer->run();

}

  

其中使用到的ceep.ive，随便用max扔俩box什么的，导出即可。
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原文地址：https://www.cnblogs.com/mumuliang/p/1884494.html