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vtkInteractorStyleUnicam.cxx
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vtkInteractorStyleUnicam.cxx
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/*=========================================================================
Program: Visualization Toolkit
Module: vtkInteractorStyleUnicam.cxx
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
/*
* This work was produced under a grant from the Department of Energy to Brown
* University. Neither Brown University nor the authors assert any copyright
* with respect to this work and it may be used, reproduced, and distributed
* without permission.
*/
#include "vtkInteractorStyleUnicam.h"
#include "vtkActor.h"
#include "vtkCamera.h"
#include "vtkMath.h"
#include "vtkObjectFactory.h"
#include "vtkPolyDataMapper.h"
#include "vtkProperty.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkRenderer.h"
#include "vtkSphereSource.h"
#include "vtkTransform.h"
#include "vtkWorldPointPicker.h"
#include "vtkCallbackCommand.h"
vtkStandardNewMacro(vtkInteractorStyleUnicam);
// define 'TheTime()' function-- returns time in elapsed seconds
#if defined(_WIN32)
# include "vtkWindows.h"
static double TheTime()
{
return GetTickCount()/1000.0;
}
#else
#include <sys/time.h>
static double TheTime()
{
struct timeval ts; struct timezone tz;
gettimeofday(&ts, &tz);
return static_cast<double>(ts.tv_sec + ts.tv_usec/1e6);
}
#endif
vtkInteractorStyleUnicam::vtkInteractorStyleUnicam()
{
// use z-buffer picking
this->InteractionPicker = vtkWorldPointPicker::New();
// set to default modes
this->IsDot = 0;
this->ButtonDown = VTK_UNICAM_NONE;
state = 0; // which camera mode is being used?
// create focus sphere actor
vtkSphereSource *sphere = vtkSphereSource::New();
sphere->SetThetaResolution(6);
sphere->SetPhiResolution(6);
vtkPolyDataMapper *sphereMapper = vtkPolyDataMapper::New();
sphereMapper->SetInputConnection(sphere->GetOutputPort());
sphere->Delete();
// XXX - would like to make the focus sphere not be affected by
// XXX - the lights-- i.e., always be easily easily seen. i'm not sure
// XXX - how to do that.
this->FocusSphere = vtkActor::New();
this->FocusSphere->SetMapper(sphereMapper);
this->FocusSphere->GetProperty()->SetColor(0.8900,0.6600,0.4100);
this->FocusSphere->GetProperty()->SetRepresentationToWireframe();
sphereMapper->Delete();
// set WorldUpVector to be z-axis by default
WorldUpVector[0] = 0;
WorldUpVector[1] = 0;
WorldUpVector[2] = 1;
}
vtkInteractorStyleUnicam::~vtkInteractorStyleUnicam()
{
this->InteractionPicker->Delete();
this->FocusSphere->Delete();
}
void vtkInteractorStyleUnicam::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os,indent);
os << indent << "Interaction Picker: " << this->InteractionPicker;
// os << indent << "WorldUpVector: " << this->WorldUpVector;
}
void vtkInteractorStyleUnicam::OnTimer()
{
; //timer just keeps ticking since we are using repeating timers
}
void vtkInteractorStyleUnicam::SetWorldUpVector(double x, double y, double z)
{
WorldUpVector[0] = x;
WorldUpVector[1] = y;
WorldUpVector[2] = z;
}
//----------------------------------------------------------------------------
void vtkInteractorStyleUnicam::OnLeftButtonDown()
{
this->GrabFocus(this->EventCallbackCommand);
int x = this->Interactor->GetEventPosition()[0];
int y = this->Interactor->GetEventPosition()[1];
this->ButtonDown = VTK_UNICAM_BUTTON_LEFT;
this->DTime = TheTime();
this->Dist = 0;
// cam manip init
double curpt[2];
this->NormalizeMouseXY(x, y, &curpt[0], &curpt[1]);
this->LastPos[0] = curpt[0];
this->LastPos[1] = curpt[1];
this->StartPix[0] = this->LastPix[0] = x;
this->StartPix[1] = this->LastPix[1] = y;
// Find 'this->DownPt' (point in world space under the cursor tip)
//
// Note: If no object has been rendered to the pixel (X, Y), then
// vtkWorldPointPicker will return a z-value with depth equal
// to the distance from the camera's position to the focal point.
// This seems like an arbitrary, but perhaps reasonable, default value.
//
this->FindPokedRenderer(x, y);
this->InteractionPicker->Pick(x, y, 0.0, this->CurrentRenderer);
this->InteractionPicker->GetPickPosition(this->DownPt);
// if someone has already clicked to make a dot and they're not clicking
// on it now, OR if the user is clicking on the perimeter of the screen,
// then we want to go into rotation mode.
if ((fabs(curpt[0]) > .85 || fabs(curpt[1]) > .9) || this->IsDot)
{
if (this->IsDot)
{
this->FocusSphere->GetPosition(this->Center);
}
state = VTK_UNICAM_CAM_INT_ROT;
}
else
{
state = VTK_UNICAM_CAM_INT_CHOOSE;
}
}
//----------------------------------------------------------------------------
double vtkInteractorStyleUnicam::WindowAspect()
{
double w = Interactor->GetRenderWindow()->GetSize()[0];
double h = Interactor->GetRenderWindow()->GetSize()[1];
return w/h;
}
//----------------------------------------------------------------------------
void vtkInteractorStyleUnicam::NormalizeMouseXY(int X, int Y,
double *NX, double *NY)
{
double w = Interactor->GetRenderWindow()->GetSize()[0];
double h = Interactor->GetRenderWindow()->GetSize()[1];
*NX = -1.0 + 2.0 * double(X) / w;
*NY = -1.0 + 2.0 * double(Y) / h;
}
//----------------------------------------------------------------------------
void vtkInteractorStyleUnicam::OnMouseMove()
{
int x = this->Interactor->GetEventPosition()[0];
int y = this->Interactor->GetEventPosition()[1];
// filter out any repeated events
static int last_X = 0;
static int last_Y = 0;
if (x == last_X && y == last_Y)
{
return;
}
// channel event to right method handler.
switch (this->ButtonDown)
{
case VTK_UNICAM_BUTTON_LEFT:
OnLeftButtonMove();
break;
}
last_X = x;
last_Y = y;
this->Interactor->Render(); // re-draw scene.. it should have changed
}
//----------------------------------------------------------------------------
void vtkInteractorStyleUnicam::OnLeftButtonUp()
{
int x = this->Interactor->GetEventPosition()[0];
int y = this->Interactor->GetEventPosition()[1];
this->ButtonDown = VTK_UNICAM_NONE;
if (state == VTK_UNICAM_CAM_INT_ROT && this->IsDot )
{
this->FocusSphereRenderer->RemoveActor(this->FocusSphere);
this->IsDot = 0;
}
else if (state == VTK_UNICAM_CAM_INT_CHOOSE)
{
if (this->IsDot)
{
this->FocusSphereRenderer->RemoveActor(this->FocusSphere);
this->IsDot = 0;
}
else
{
this->FocusSphere->SetPosition(this->DownPt[0],
this->DownPt[1],
this->DownPt[2]);
double from[3];
this->FindPokedRenderer(x, y);
vtkCamera* camera = this->CurrentRenderer->GetActiveCamera();
camera->GetPosition(from);
double vec[3];
vec[0] = this->DownPt[0] - from[0];
vec[1] = this->DownPt[1] - from[1];
vec[2] = this->DownPt[2] - from[2];
double at_v[4];
camera->GetDirectionOfProjection(at_v);
vtkMath::Normalize(at_v);
// calculate scale so focus sphere always is the same size on the screen
double s = 0.02 * vtkMath::Dot(at_v, vec);
this->FocusSphere->SetScale(s, s, s);
this->FindPokedRenderer(x, y);
this->FocusSphereRenderer = this->CurrentRenderer;
this->FocusSphereRenderer->AddActor(this->FocusSphere);
this->IsDot = 1;
}
this->Interactor->Render();
}
vtkRenderWindowInteractor *rwi = this->Interactor;
rwi->GetRenderWindow()->SetDesiredUpdateRate(rwi->GetStillUpdateRate());
rwi->Render();
if (this->UseTimers)
{
rwi->DestroyTimer(this->TimerId);
}
this->ReleaseFocus();
}
//----------------------------------------------------------------------------
void vtkInteractorStyleUnicam::OnLeftButtonMove()
{
int x = this->Interactor->GetEventPosition()[0];
int y = this->Interactor->GetEventPosition()[1];
switch (state)
{
case VTK_UNICAM_CAM_INT_CHOOSE: this->ChooseXY(x, y); break;
case VTK_UNICAM_CAM_INT_ROT: this->RotateXY(x, y); break;
case VTK_UNICAM_CAM_INT_PAN: this->PanXY(x, y); break;
case VTK_UNICAM_CAM_INT_DOLLY: this->DollyXY(x, y); break;
}
}
//----------------------------------------------------------------------------
void vtkInteractorStyleUnicam::ChooseXY( int X, int Y )
{
int te[2]; // pixel location
te[0] = X;
te[1] = Y;
double curpt[2];
this->NormalizeMouseXY(X, Y, &curpt[0], &curpt[1]);
double delta[2];
delta[0] = curpt[0] - this->LastPos[0];
delta[1] = curpt[1] - this->LastPos[1];
this->LastPos[0] = te[0];
this->LastPos[1] = te[1];
double tdelt(TheTime() - this->DTime);
this->Dist += sqrt(delta[0] * delta[0] + delta[1] * delta[1]);
double sdelt[2];
sdelt[0] = te[0] - this->StartPix[0];
sdelt[1] = te[1] - this->StartPix[1];
int xa=0,ya=1;
if (getenv("FLIP_CAM_MANIP"))
{
int tmp = xa;
xa = ya;
ya = tmp;
}
double len = sqrt(sdelt[0] * sdelt[0] + sdelt[1] * sdelt[1]);
if (fabs(sdelt[ya])/len > 0.9 && tdelt > 0.05)
{
state = VTK_UNICAM_CAM_INT_DOLLY;
}
else if (tdelt < 0.1 && this->Dist < 0.03)
{
return;
}
else
{
if (fabs(sdelt[xa])/len > 0.6 )
{
state = VTK_UNICAM_CAM_INT_PAN;
}
else
{
state = VTK_UNICAM_CAM_INT_DOLLY;
}
}
}
// define some utilty functions
template <class Type>
inline Type clamp(const Type a,
const Type b,
const Type c) { return a > b ? (a < c ? a : c) : b ; }
inline int Sign (double a) { return a > 0 ? 1 : a < 0 ? -1 : 0; }
//----------------------------------------------------------------------------
void vtkInteractorStyleUnicam::RotateXY( int X, int Y )
{
double cpt[3];
double center[3];
this->FocusSphere->GetPosition(center);
this->ComputeWorldToDisplay(center[0], center[1], center[2], cpt);
this->NormalizeMouseXY(static_cast<int>(cpt[0]), static_cast<int>(cpt[1]),
&cpt[0], &cpt[1]);
double radsq = pow(1.0+fabs(cpt[0]),2.0); // squared rad of virtual cylinder
double tp[2], te[2];
this->NormalizeMouseXY(static_cast<int>(this->LastPix[0]),
static_cast<int>(this->LastPix[1]), &tp[0], &tp[1]);
this->NormalizeMouseXY(X, Y, &te[0], &te[1]);
this->LastPix[0] = X;
this->LastPix[1] = Y;
double op[3], oe[3];
op[0] = tp[0];
op[1] = 0;
op[2] = 0;
oe[0] = te[0];
oe[1] = 0;
oe[2] = 0;
double opsq = op[0] * op[0], oesq = oe[0] * oe[0];
double lop = opsq > radsq ? 0 : sqrt(radsq - opsq);
double loe = oesq > radsq ? 0 : sqrt(radsq - oesq);
double nop[3], noe[3];
nop[0] = op[0];
nop[1] = 0;
nop[2] = lop;
vtkMath::Normalize(nop);
noe[0] = oe[0];
noe[1] = 0;
noe[2] = loe;
vtkMath::Normalize(noe);
double dot = vtkMath::Dot(nop, noe);
if (fabs(dot) > 0.0001)
{
this->FindPokedRenderer(X, Y);
double angle = -2*acos(clamp(dot,-1.0,1.0)) * Sign(te[0]-tp[0]);
double UPvec[3];
UPvec[0] = WorldUpVector[0];
UPvec[1] = WorldUpVector[1];
UPvec[2] = WorldUpVector[2];
vtkMath::Normalize(UPvec);
MyRotateCamera(center[0], center[1], center[2],
UPvec[0], UPvec[1], UPvec[2],
angle);
double dvec[3];
double from[3];
vtkCamera* camera = this->CurrentRenderer->GetActiveCamera();
camera->GetPosition(from);
for(int i=0; i<3; i++)
{
dvec[i] = from[i] - center[i];
}
double rdist = te[1]-tp[1];
vtkMath::Normalize(dvec);
double atV[4], upV[4], rightV[4];
camera->GetViewPlaneNormal(atV);
camera->GetViewUp(upV);
vtkMath::Cross(upV, atV, rightV);
vtkMath::Normalize(rightV);
//
// The following two tests try to prevent chaotic camera movement
// that results from rotating over the poles defined by the
// "WorldUpVector". The problem is the constraint to keep the
// camera's up vector in line w/ the WorldUpVector is at odds with
// the action of rotating tover the top of the virtual sphere used
// for rotation. The solution here is to prevent the user from
// rotating the last bit required to "go over the top"-- as a
// consequence, you can never look directly down on the poles.
//
// The "0.99" value is somewhat arbitrary, but seems to produce
// reasonable results. (Theoretically, some sort of clamping
// function could probably be used rather than a hard cutoff, but
// time constraints prevent figuring that out right now.)
//
const double OVER_THE_TOP_THRESHOLD = 0.99;
if (vtkMath::Dot(UPvec, atV) > OVER_THE_TOP_THRESHOLD && rdist < 0)
{
rdist = 0;
}
if (vtkMath::Dot(UPvec, atV) < -OVER_THE_TOP_THRESHOLD && rdist > 0)
{
rdist = 0;
}
MyRotateCamera(center[0], center[1], center[2],
rightV[0], rightV[1], rightV[2],
rdist);
camera->SetViewUp(UPvec[0], UPvec[1], UPvec[2]);
}
}
//----------------------------------------------------------------------------
void vtkInteractorStyleUnicam::DollyXY( int X, int Y )
{
int i;
double cn[2], ln[2];
this->NormalizeMouseXY(X, Y, &cn[0], &cn[1]);
this->NormalizeMouseXY(static_cast<int>(this->LastPix[0]),
static_cast<int>(this->LastPix[1]), &ln[0], &ln[1]);
double delta[2];
delta[0] = cn[0] - ln[0];
delta[1] = cn[1] - ln[1];
this->LastPix[0] = X;
this->LastPix[1] = Y;
// 1. handle dollying
// XXX - assume perspective projection for now.
double from[3];
this->FindPokedRenderer(X, Y);
vtkCamera* camera = this->CurrentRenderer->GetActiveCamera();
camera->GetPosition(from);
double movec[3];
for(i=0; i<3; i++)
{
movec[i] = this->DownPt[i] - from[i];
}
double offset1[3];
for(i=0; i<3; i++)
{
offset1[i] = movec[i] * delta[1] * -4;
}
this->MyTranslateCamera(offset1);
// 2. now handle side-to-side panning
double rightV[3], upV[3];
this->GetRightVandUpV(this->DownPt, camera,
rightV, upV);
double offset2[3];
for(i=0; i<3; i++)
{
offset2[i] = (-delta[0] * rightV[i]);
}
this->MyTranslateCamera(offset2);
}
//----------------------------------------------------------------------------
//
// Transform mouse horizontal & vertical movements to a world
// space offset for the camera that maintains pick correlation.
//
void vtkInteractorStyleUnicam::PanXY( int X, int Y )
{
double delta[2];
double cn[2], ln[2];
int i;
this->NormalizeMouseXY(X, Y, &cn[0], &cn[1]);
this->NormalizeMouseXY(static_cast<int>(this->LastPix[0]),
static_cast<int>(this->LastPix[1]), &ln[0], &ln[1]);
delta[0] = cn[0] - ln[0];
delta[1] = cn[1] - ln[1];
this->LastPix[0] = X;
this->LastPix[1] = Y;
// XXX - assume perspective projection for now
this->FindPokedRenderer(X, Y);
double rightV[3], upV[3];
vtkCamera* camera = this->CurrentRenderer->GetActiveCamera();
this->GetRightVandUpV(this->DownPt, camera,
rightV, upV);
double offset[3];
for(i=0; i<3; i++)
{
offset[i] = (-delta[0] * rightV[i] +
-delta[1] * upV [i]);
}
this->MyTranslateCamera(offset);
}
//
// Given a 3D point & a vtkCamera, compute the vectors that extend
// from the projection of the center of projection to the center of
// the right-edge and the center of the top-edge onto the plane
// containing the 3D point & with normal parallel to the camera's
// projection plane.
//
void vtkInteractorStyleUnicam::GetRightVandUpV(double *p, vtkCamera *cam,
double *rightV, double *upV)
{
int i;
// Compute the horizontal & vertical scaling ('scalex' and 'scaley')
// factors as function of the down point & camera params.
double from[3];
cam->GetPosition(from);
// construct a vector from the viewing position to the picked point
double vec[3];
for(i=0; i<3; i++)
{
vec[i] = p[i] - from[i];
}
// Get shortest distance 'l' between the viewing position and
// plane parallel to the projection plane that contains the 'DownPt'.
double atV[4];
cam->GetViewPlaneNormal(atV);
vtkMath::Normalize(atV);
double l = -vtkMath::Dot(vec, atV);
double view_angle = cam->GetViewAngle() * vtkMath::Pi() / 180.0;
double w = Interactor->GetRenderWindow()->GetSize()[0];
double h = Interactor->GetRenderWindow()->GetSize()[1];
double scalex = w/h*((2*l*tan(view_angle/2))/2);
double scaley = ((2*l*tan(view_angle/2))/2);
// construct the camera offset vector as function of delta mouse X & Y.
cam->GetViewUp(upV);
vtkMath::Cross(upV, atV, rightV);
vtkMath::Cross(atV, rightV, upV); // (make sure 'upV' is orthogonal
// to 'atV' & 'rightV')
vtkMath::Normalize(rightV);
vtkMath::Normalize(upV);
for(i=0; i<3; i++)
{
rightV[i] = rightV[i] * scalex;
upV [i] = upV [i] * scaley;
}
}
//
// Rotate the camera by 'angle' degrees about the point <cx, cy, cz>
// and around the vector/axis <ax, ay, az>.
//
void vtkInteractorStyleUnicam::MyRotateCamera(double cx, double cy, double cz,
double ax, double ay, double az,
double angle)
{
angle *= 180.0 / vtkMath::Pi(); // vtk uses degrees, not radians
double p[4], f[4], u[4];
vtkCamera* camera = this->CurrentRenderer->GetActiveCamera();
camera->GetPosition (p);
camera->GetFocalPoint(f);
camera->GetViewUp (u);
p[3] = f[3] = 1.0; // (points)
u[3] = 0.0; // (a vector)
vtkTransform *t = vtkTransform::New();
t->PostMultiply();
t->Identity();
t->Translate(-cx, -cy, -cz);
t->RotateWXYZ(angle, ax, ay, az);
t->Translate( cx, cy, cz);
double new_p[4], new_f[4];
t->MultiplyPoint(p, new_p);
t->MultiplyPoint(f, new_f);
double new_u[4];
t->Identity();
t->RotateWXYZ(angle, ax, ay, az);
t->MultiplyPoint(u, new_u);
camera->SetPosition (new_p[0], new_p[1], new_p[2]);
camera->SetFocalPoint(new_f[0], new_f[1], new_f[2]);
camera->SetViewUp (new_u[0], new_u[1], new_u[2]);
// IMPORTANT! If you don't re-compute view plane normal, the camera
// view gets all messed up.
camera->ComputeViewPlaneNormal();
t->Delete();
}
// Translate the camera by the offset <v[0], v[1], v[2]>. Update
// the camera clipping range.
//
void vtkInteractorStyleUnicam::MyTranslateCamera(double v[3])
{
double p[3], f[3];
vtkCamera* camera = this->CurrentRenderer->GetActiveCamera();
camera->GetPosition (p);
camera->GetFocalPoint(f);
double newP[3], newF[3];
for(int i=0;i<3;i++)
{
newP[i] = p[i] + v[i];
newF[i] = f[i] + v[i];
}
camera->SetPosition (newP);
camera->SetFocalPoint(newF);
if (this->AutoAdjustCameraClippingRange)
{
this->CurrentRenderer->ResetCameraClippingRange();
}
}