Q3DWidget.h

#ifndef Q3DWIDGET_H_
#define Q3DWIDGET_H_

#include <boost/scoped_ptr.hpp>
#include <inttypes.h>
#include <string>
#include <QtOpenGL>
#include <QtGui>

enum CameraState
{
	IDLE = 0,
	ROTATING = 1,
	MOVING = 2,
	ZOOMING = 3
};

struct CameraPose
{
        CameraState state;
	float pan, tilt, distance;
	float xOffset, yOffset, zOffset;
	float xOffset2D, yOffset2D, rotation2D, zoom, warpX, warpY;
};

struct CameraParams
{
	float zoomSensitivity;
	float rotateSensitivity;
	float moveSensitivity;

	float minZoomRange;
	float cameraFov;
	float minClipRange;
	float maxClipRange;

	float zoomSensitivity2D;
	float rotateSensitivity2D;
	float moveSensitivity2D;
};

enum MouseState
{
	MOUSE_STATE_UP = 0,
	MOUSE_STATE_DOWN = 1
};

typedef void (*DisplayFunc)(void *);
typedef void (*KeyboardFunc)(char, void *);
typedef void (*MouseFunc)(Qt::MouseButton, MouseState, int32_t, int32_t, void *);
typedef void (*MotionFunc)(int32_t, int32_t, void *);

class Q3DWidget: public QGLWidget
{
	Q_OBJECT

public:
        explicit Q3DWidget(QWidget* parent);
        ~Q3DWidget();

        void initialize(int32_t windowX, int32_t windowY,
                        int32_t windowWidth, int32_t windowHeight, float fps);

	void setCameraParams(float zoomSensitivity, float rotateSensitivity,
						 float moveSensitivity, float minZoomRange,
						 float camera_fov, float minClipRange,
						 float maxClipRange);

	void setCameraLimit(bool onoff);

	void set2DCameraParams(float zoomSensitivity,
						   float rotateSensitivity,
						   float moveSensitivity);

	void set3D(bool onoff);
	bool is3D(void) const;

	void setInitialCameraPos(float pan, float tilt, float range,
							 float xOffset, float yOffset, float zOffset);
	void setInitial2DCameraPos(float xOffset, float yOffset,
							   float rotation, float zoom);
        void setCameraPose(const CameraPose& cameraPose);
        CameraPose getCameraPose(void) const;

        void setDisplayFunc(DisplayFunc func, void* clientData);
        void setKeyboardFunc(KeyboardFunc func, void* clientData);
        void setMouseFunc(MouseFunc func, void* clientData);
        void setMotionFunc(MotionFunc func, void* clientData);
	void addTimerFunc(uint32_t msecs, void(*func)(void *),
					  void* clientData);

	void forceRedraw(void);

	void set2DWarping(float warpX, float warpY);

	void recenter(void);
	void recenter2D(void);

	void set2DRotation(bool onoff);

        void setDisplayMode2D(void);

        std::pair<float,float> getPositionIn3DMode(int32_t mouseX,
                                                   int32_t mouseY);

        std::pair<float,float> getPositionIn2DMode(int32_t mouseX,
                                                   int32_t mouseY);

	int32_t getWindowWidth(void);
	int32_t getWindowHeight(void);
	int32_t getLastMouseX(void);
	int32_t getLastMouseY(void);
	int32_t getMouseX(void);
	int32_t getMouseY(void);

private Q_SLOTS:
	void userTimer(void);

private:
	void rotateCamera(float dx, float dy);
	void zoomCamera(float dy);
	void moveCamera(float dx, float dy);
	void rotateCamera2D(float dx);
	void zoomCamera2D(float dx);
	void moveCamera2D(float dx, float dy);

	void switchTo3DMode(void);
        void setDisplayMode3D(void);

	float r2d(float angle);
	float d2r(float angle);

	// QGLWidget events
	void initializeGL(void);
	void paintGL(void);
	void resizeGL(int32_t width, int32_t height);

	// Qt events
	void keyPressEvent(QKeyEvent* event);
	void mousePressEvent(QMouseEvent* event);
	void mouseReleaseEvent(QMouseEvent* event);
	void mouseMoveEvent(QMouseEvent* event);
	void wheelEvent(QWheelEvent *wheel);
	void timerEvent(QTimerEvent* event);
	void closeEvent(QCloseEvent* event);

        DisplayFunc userDisplayFunc;
        KeyboardFunc userKeyboardFunc;
        MouseFunc userMouseFunc;
        MotionFunc userMotionFunc;

	void* userDisplayFuncData;
	void* userKeyboardFuncData;
	void* userMouseFuncData;
	void* userMotionFuncData;

	int32_t windowWidth, windowHeight;
	float requestedFps;
        CameraPose cameraPose;
	int32_t lastMouseX, lastMouseY;

	bool _is3D;

	bool _forceRedraw;
	bool allow2DRotation;
	bool limitCamera;

        CameraParams cameraParams;

	QBasicTimer timer;

	void (*timerFunc)(void *);
	void* timerFuncData;
};

#endif