library: libRGL
#include "TGLPerspectiveCamera.h" |
TGLPerspectiveCamera
class description - header file - source file - inheritance tree (.pdf)
public:
TGLPerspectiveCamera(const TGLVector3& hAxis, const TGLVector3& vAxis)
virtual ~TGLPerspectiveCamera()
virtual void Apply(const TGLBoundingBox& box, const TGLRect* pickRect = 0) const
static TClass* Class()
void Configure(Double_t fov, Double_t dolly, Double_t* center, Double_t hRotate, Double_t vRotate)
virtual Bool_t Dolly(Int_t delta, Bool_t mod1, Bool_t mod2)
virtual TClass* IsA() const
virtual void Reset()
virtual Bool_t Rotate(Int_t xDelta, Int_t yDelta)
virtual void Setup(const TGLBoundingBox& box)
virtual void ShowMembers(TMemberInspector& insp, char* parent)
virtual void Streamer(TBuffer& b)
void StreamerNVirtual(TBuffer& b)
virtual Bool_t Truck(Int_t x, Int_t y, Int_t xDelta, Int_t yDelta)
virtual Bool_t Zoom(Int_t delta, Bool_t mod1, Bool_t mod2)
private:
TGLVector3 fHAxis !
TGLVector3 fVAxis !
Double_t fDollyMin !
Double_t fDollyDefault !
Double_t fDollyMax !
Double_t fFOV !
Double_t fDolly !
Double_t fVRotate !
Double_t fHRotate !
TGLVertex3 fCenter !
TGLVector3 fTruck !
static Double_t fgFOVMin
static Double_t fgFOVDefault
static Double_t fgFOVMax
static UInt_t fgDollyDeltaSens
static UInt_t fgFOVDeltaSens
TGLPerspectiveCamera
Perspective projection camera - with characteristic foreshortening.
TODO: Currently constrains YOZ plane to be floor - this is never
'tipped'. While useful we really need to extend so can:
i) Pick any one of the three natural planes of the world to be floor.
ii) Can use a free arcball style camera with no contraint - integrate
TArcBall.
void Setup(const TGLBoundingBox & box)
Setup camera limits suitible to view the world volume defined by 'box'
and call Reset() to initialise camera.
void Reset()
Reset the camera to defaults - reframe the world volume established in Setup()
in default state. Note: limits defined in Setup() are not adjusted.
Bool_t Dolly(Int_t delta, Bool_t mod1, Bool_t mod2)
Dolly the camera - 'move camera along eye line, retaining lens focal length'.
Arguments are:
'delta' - mouse viewport delta (pixels) - +ive dolly in, -ive dolly out
'mod1' / 'mod2' - sensitivity modifiers - see TGLCamera::AdjustAndClampVal()
Returns kTRUE is redraw required (camera change), kFALSE otherwise.
Bool_t Zoom(Int_t delta, Bool_t mod1, Bool_t mod2)
Zoom the camera - 'adjust lens focal length, retaining camera position'.
Arguments are:
'delta' - mouse viewport delta (pixels) - +ive zoom in, -ive zoom out
'mod1' / 'mod2' - sensitivity modifiers - see TGLCamera::AdjustAndClampVal()
Returns kTRUE is redraw required (camera change), kFALSE otherwise.
Bool_t Truck(Int_t x, Int_t y, Int_t xDelta, Int_t yDelta)
Truck the camera - 'move camera parallel to film plane'. The film
plane is defined by the EyePoint() / EyeDirection() pair. Define motion
using center point (x/y) and delta (xDelta/yDelta) - the mouse motion.
For an orthographic projection this means all objects (regardless of
camera distance) track the mouse motion.
Returns kTRUE is redraw required (camera change), kFALSE otherwise.
Note: Trucking is often mistakenly refered to as 'pan' or 'panning'.
Panning is swivelling the camera on it's own axis - the eye point.
Bool_t Rotate(Int_t xDelta, Int_t yDelta)
Rotate the camera round view volume center established in Setup().
Arguments are:
xDelta - horizontal delta (pixels)
YDelta - vertical delta (pixels)
Deltas are divided by equivalent viewport dimension and scaled
by full rotation - i.e. translates fraction of viewport to
fractional rotation.
void Apply(const TGLBoundingBox & sceneBox, const TGLRect * pickRect)
Apply the camera to the current GL context, setting the viewport, projection
and modelview matricies. After this verticies etc can be directly entered
in the world frame. This also updates the cached frustum values, enabling
all the projection, overlap tests etc defined in TGLCamera to be used.
Arguments are:
'box' - view volume box - used to adjust near/far clipping
'pickRect' - optional picking rect. If non-null, restrict drawing to this
viewport rect.
Author: Richard Maunder 25/05/2005
Last update: root/gl:$Name: $:$Id: TGLPerspectiveCamera.cxx,v 1.16 2006/02/23 16:44:52 brun Exp $
Copyright (C) 1995-2000, Rene Brun and Fons Rademakers. *
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