#ifndef GLLANDSCAPE_H#define GLLANDSCAPE_H#include <qgl.h>class GLLandscape : public QGLWidget{    Q_OBJECTpublic:    GLLandscape( QWidget * parent = 0, const char * name = 0 );    ~GLLandscape();    public slots:    void rotateX( int );    void rotateY( int );    void rotateZ( int );    void zoom( int );    void fractalize();    void resetGrid();        void setWireframe( int );    void setFilled( int );    void setSmoothShaded( int );    void setLandscape( int );    void setGridSize( int );        void toggleWaveAnimation( bool );signals:    void rotatedX( int );    void rotatedY( int );    void rotatedZ( int );    protected:    void paintGL();    void initializeGL();    void resizeGL( int w, int h );    void mousePressEvent( QMouseEvent * );    void mouseReleaseEvent( QMouseEvent * );    void mouseMoveEvent( QMouseEvent * );    void timerEvent( QTimerEvent * );    void showEvent( QShowEvent * );    void hideEvent( QHideEvent * );        void drawWireframe();    void drawFilled();    void drawSmoothShaded();    private:    enum Axis { XAxis, YAxis, ZAxis };    enum RenderModes { Wireframe, Filled, SmoothShaded, Landscape };    enum Views { DefaultView, CurrentView };    void rotate( GLfloat deg, Axis axis );    void calculateVertexNormals();    void averageNormals();    void createGrid( int size );    void destroyGrid();        RenderModes mode;        typedef struct grid_normals {	double u[3], l[3];    } gridNormals;    // Structure used to store the vertex normals for the landscape    typedef struct avg_normals {	double n[3];    } avgNormals;    typedef struct viewMatrix {	GLfloat model[4][4];      // OpenGL model view matrix for the view	GLfloat projection[4][4]; // OpenGL projection matrix for the view    } viewMatrix;    double      ** landscape; // Height field data    double      ** wave;      // Wave data    double      ** wt;        // Parameterized wave data    gridNormals ** normals;    avgNormals  ** vertexNormals;    viewMatrix     views[2];        QPoint  oldPos;    GLfloat oldX, oldY, oldZ;    bool initFractals;    int  gridSize, gridHalf;    bool animationRunning;    bool mouseButtonDown;};#endif