source-engine/public/matsys_controls/manipulator.h

//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose: 
//
//=============================================================================

#ifndef MANIPULATOR_H
#define MANIPULATOR_H
#ifdef _WIN32
#pragma once
#endif

#include "vgui_controls/Panel.h"
#include "mathlib/vector.h"

//-----------------------------------------------------------------------------
// Manipulator interface
//-----------------------------------------------------------------------------
class IManipulator
{
public:
	virtual ~IManipulator(){}
	virtual void OnBeginManipulation( void ) = 0;
	virtual void OnAcceptManipulation( void ) = 0;
	virtual void OnCancelManipulation( void ) = 0;

	virtual void OnTick( void ) = 0;

	virtual void OnCursorMoved( int x, int y ) = 0;
	virtual void OnMousePressed( vgui::MouseCode code, int x, int y ) = 0;
	virtual void OnMouseReleased( vgui::MouseCode code, int x, int y ) = 0;
	virtual void OnMouseWheeled( int delta ) = 0;

	virtual void SetViewportSize( int w, int h ) = 0;
};


//-----------------------------------------------------------------------------
// Base class helper for implementing manipulators
//-----------------------------------------------------------------------------
class CBaseManipulator : public IManipulator
{
public:
	CBaseManipulator()
	{
		m_nViewport[ 0 ] = m_nViewport[ 1 ]  = 0;
	}

	virtual void OnTick( void ) {};

	virtual void OnBeginManipulation( void ) {}
	virtual void OnAcceptManipulation( void ) {};
	virtual void OnCancelManipulation( void ) {};

	virtual void OnCursorMoved( int x, int y ) {};
	virtual void OnMousePressed( vgui::MouseCode code, int x, int y ) {};
	virtual void OnMouseReleased( vgui::MouseCode code, int x, int y ) {};
	virtual void OnMouseWheeled( int delta ) {};

	virtual void SetViewportSize( int w, int h )
	{
		m_nViewport[ 0 ] = w;
        m_nViewport[ 1 ] = h;
	}

protected:
	int			m_nViewport[ 2 ];
};


//-----------------------------------------------------------------------------
// Base class for manipulators which operate on transforms
//-----------------------------------------------------------------------------
class CTransformManipulator : public CBaseManipulator
{
public:
	CTransformManipulator( matrix3x4_t *pTransform );

	void SetTransform( matrix3x4_t *transform );
	matrix3x4_t *GetTransform();

protected:
	matrix3x4_t *m_pTransform;
};


//-----------------------------------------------------------------------------
// Standard maya-like transform manipulator
//-----------------------------------------------------------------------------
class CPotteryWheelManip : public CTransformManipulator
{
public:
	CPotteryWheelManip( matrix3x4_t *pTransform );

	virtual void OnBeginManipulation( void );
	virtual void OnAcceptManipulation( void );
	virtual void OnCancelManipulation( void );

	virtual void OnTick( void );

	virtual void OnCursorMoved( int x, int y );
	virtual void OnMousePressed( vgui::MouseCode code, int x, int y );
	virtual void OnMouseReleased( vgui::MouseCode code, int x, int y );
	virtual void OnMouseWheeled( int delta );

	// Sets the zoom level
	void SetZoom( float flZoom );

protected:
	int m_lastx, m_lasty;

	float m_zoom;
	float m_altitude, m_azimuth;
	//vec3 m_lookat

	float m_prevZoom;
	float m_prevAltitude, m_prevAzimuth;

	float m_flLastMouseTime;
	float m_flLastTickTime;
	float m_flSpin;
	bool m_bSpin;

	void UpdateTransform( void );
	void UpdateZoom( float delta );
};


#endif // MANIPULATOR_H