qglobe.h

在linux系统下开发的GPS接收程序,具有良好的图形操作界面.

//-----------------------------------------------------------------------------
// qglobe.h : OpenGL window for position visualization on the Earth
//
//	- programmed by Boyoon Jung ([e-mail])
//-----------------------------------------------------------------------------
#ifndef __QGLOBE_H
#define __QGLOBE_H


// header files for Qt library
#include <qgl.h>
#include <qimage.h>
#include <qcursor.h>

// header files for math
#include <cmath>


// WGS84 Parameters
#define GA	6378137
#define GB	6356752.31424518
#define GF	0.0033528107
#define GE	0.0818191908
#define GEP	0.0820944379


class QGlobe : public QGLWidget
{
    Q_OBJECT

    private:
	GLuint model_globe;		// 3D model of a globe
	QImage texture;			// texture
	GLuint model_position;		// 3D model of a position indicator

	GLfloat latitude, longitude, altitude, geoid;	// position

	bool mb_pressed;		// rotation
	int prev_x, prev_y;
	GLfloat hrot, vrot;

	bool flag_shown;			// is a position indicator is shown?

	QCursor orig_cursor;		// original cursor

    protected:
	// override methods
	void initializeGL();
	void paintGL();
	void resizeGL( int w, int h );

	// construct a 3D model for a globe
	GLuint buildGlobeModel(void);

	// construct a 3D model for a position indicator
	GLuint buildPositionModel(void);

	// convert a ECEF position to a geodetic position
	void ecef2geo(float x, float y, float z,
		      float& latitude, float& longitude, float& altitude, float& geoid);

	// re-implemented functions
	void mousePressEvent(QMouseEvent* e);
	void mouseMoveEvent(QMouseEvent* e);
	void mouseReleaseEvent(QMouseEvent* e);

    public:
	// constructor
	QGlobe( QWidget* parent, const char* name );
	// destructor
	~QGlobe();

	// check if a position indicator is shown
	bool isShown(void) { return flag_shown; }

    public slots:
	// set a position indicator
        void setPosition(float latitude, float longitude, float altitude, float geoid=0.0f);
	void setECEF(float x, float y, float z);

	// show/hide a position indicator
	void showPosition(void) { flag_shown = true; update(); }
	void hidePosition(void) { flag_shown = false; update(); }
};


// set position
inline void QGlobe::setPosition(float lat, float lon, float alt, float geo)
{
    // set position
    latitude = lat;
    longitude = lon;
    altitude = alt;
    geoid = geo;

    // update the OpenGL window
    flag_shown = true;
    update();
}


// set ECEF position
inline void QGlobe::setECEF(float x, float y, float z)
{
    // set position
    ecef2geo(x, y, z, latitude, longitude, altitude, geoid);

    // update the OpenGL window
    flag_shown = true;
    update();
}


#endif // __QGLOBE_H