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//========= Copyright Valve Corporation, All rights reserved. ============//
//
// Purpose:
//
// $NoKeywords: $
//=============================================================================
#include "matsys_controls/manipulator.h"
#include "materialsystem/imaterialsystem.h"
#include "vgui/IVGui.h"
#include "vgui/IInput.h"
#include "vgui/ISystem.h"
#include "vgui/MouseCode.h"
#include "mathlib/vector.h"
#include "mathlib/vmatrix.h"
#include "mathlib/mathlib.h"
#include <float.h>
using namespace vgui;
//-----------------------------------------------------------------------------
// local helper functions
//-----------------------------------------------------------------------------
static float UpdateTime( float &flLastTime )
{
float flTime = vgui::system()->GetFrameTime();
float dt = flTime - flLastTime;
flLastTime = flTime;
return dt;
}
//-----------------------------------------------------------------------------
// Base class for manipulators which operate on transforms
//-----------------------------------------------------------------------------
CTransformManipulator::CTransformManipulator( matrix3x4_t *pTransform ) :
m_pTransform( pTransform )
{
}
void CTransformManipulator::SetTransform( matrix3x4_t *pTransform )
{
m_pTransform = pTransform;
}
matrix3x4_t *CTransformManipulator::GetTransform( void )
{
return m_pTransform;
}
//-----------------------------------------------------------------------------
// CPotteryWheelManip - nendo-style camera manipulator
//-----------------------------------------------------------------------------
CPotteryWheelManip::CPotteryWheelManip( matrix3x4_t *pTransform ) :
CTransformManipulator( pTransform ),
m_lastx( -1 ), m_lasty( -1 ),
m_zoom( 100.0f ), m_altitude( 0.0f ), m_azimuth( 0.0f ),
m_prevZoom( 100.0f ), m_prevAltitude( 0.0f ), m_prevAzimuth( 0.0f ),
m_flLastMouseTime( 0.0f ), m_flLastTickTime( 0.0f ),
m_flSpin( 0.0f ), m_bSpin( false )
{
}
void CPotteryWheelManip::OnBeginManipulation( void )
{
m_prevZoom = m_zoom;
m_prevAltitude = m_altitude;
m_prevAzimuth = m_azimuth;
m_flLastMouseTime = m_flLastTickTime = vgui::system()->GetFrameTime();
m_flSpin = 0.0f;
m_bSpin = false;
}
// Sets the zoom level
void CPotteryWheelManip::SetZoom( float flZoom )
{
m_prevZoom = m_zoom = flZoom;
}
void CPotteryWheelManip::OnAcceptManipulation( void )
{
m_flSpin = 0.0f;
m_bSpin = false;
}
void CPotteryWheelManip::OnCancelManipulation( void )
{
m_zoom = m_prevZoom;
m_altitude = m_prevAltitude;
m_azimuth = m_prevAzimuth;
m_flSpin = 0.0f;
m_bSpin = false;
UpdateTransform();
}
void CPotteryWheelManip::OnTick( void )
{
float dt = UpdateTime( m_flLastTickTime );
if ( m_bSpin )
{
m_azimuth += dt * m_flSpin;
UpdateTransform();
}
}
void CPotteryWheelManip::OnCursorMoved( int x, int y )
{
float dt = UpdateTime( m_flLastMouseTime );
if ( m_bSpin )
{
m_lastx = x;
m_lasty = y;
return;
}
if ( input()->IsMouseDown( MOUSE_MIDDLE ) )
{
int dy = y - m_lasty;
int dx = x - m_lastx;
if ( abs( dx ) < 2 * abs( dy ) )
{
UpdateZoom( 0.2f * dy );
}
else
{
m_flSpin = (dt != 0.0f) ? 0.002f * dx / dt : 0.0f;
m_azimuth += 0.002f * dx;
}
}
else
{
m_azimuth += 0.002f * ( x - m_lastx );
m_altitude -= 0.002f * ( y - m_lasty );
m_altitude = max( (float)-M_PI/2, min( (float)M_PI/2, m_altitude ) );
}
m_lastx = x;
m_lasty = y;
UpdateTransform();
}
void CPotteryWheelManip::OnMousePressed( vgui::MouseCode code, int x, int y )
{
UpdateTime( m_flLastMouseTime );
m_lastx = x;
m_lasty = y;
m_bSpin = false;
m_flSpin = 0.0f;
}
void CPotteryWheelManip::OnMouseReleased( vgui::MouseCode code, int x, int y )
{
UpdateTime( m_flLastMouseTime );
if ( code == MOUSE_MIDDLE )
{
m_bSpin = ( fabs( m_flSpin ) > 1.0f );
}
m_lastx = x;
m_lasty = y;
}
void CPotteryWheelManip::OnMouseWheeled( int delta )
{
UpdateTime( m_flLastMouseTime );
UpdateZoom( -10.0f * delta );
UpdateTransform();
}
void CPotteryWheelManip::UpdateTransform()
{
if ( !m_pTransform )
return;
float y = m_zoom * sin( m_altitude );
float xz = m_zoom * cos( m_altitude );
float x = xz * sin( m_azimuth );
float z = xz * cos( m_azimuth );
Vector position(x, y, z);
AngleMatrix( RadianEuler( -m_altitude, m_azimuth, 0 ), position, *m_pTransform );
}
void CPotteryWheelManip::UpdateZoom( float delta )
{
m_zoom *= pow( 1.01f, delta );
}
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