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602 lines
17 KiB
C++
602 lines
17 KiB
C++
/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkProp3DAxisFollower.cxx
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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#include "vtkProp3DAxisFollower.h"
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#include "vtkAxisActor.h"
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#include "vtkBoundingBox.h"
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#include "vtkCamera.h"
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#include "vtkCoordinate.h"
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#include "vtkMath.h"
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#include "vtkMatrix4x4.h"
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#include "vtkObjectFactory.h"
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#include "vtkProperty.h"
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#include "vtkViewport.h"
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#include "vtkTexture.h"
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#include "vtkTransform.h"
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#include <cmath>
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vtkStandardNewMacro(vtkProp3DAxisFollower);
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// List of vectors per axis (depending on which one needs to be
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// followed.
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// Order here is X, Y, and Z.
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// Set of two axis aligned vectors that would define the Y vector.
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// Order is MINMIN, MINMAX, MAXMAX, MAXMIN
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namespace
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{
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const double AxisAlignedY[3][4][2][3] =
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{
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{ {{0.0, 1.0, 0.0}, {0.0, 0.0, 1.0}},
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{{0.0, 1.0, 0.0}, {0.0, 0.0, -1.0}},
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{{0.0, -1.0, 0.0}, {0.0, 0.0, -1.0}},
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{{0.0, -1.0, 0.0}, {0.0, 0.0, 1.0}}
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},
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{
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{{ 1.0, 0.0, 0.0}, {0.0, 0.0, 1.0}},
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{{ 1.0, 0.0, 0.0}, {0.0, 0.0, -1.0}},
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{{-1.0, 0.0, 0.0}, {0.0, 0.0, -1.0}},
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{{-1.0, 0.0, 0.0}, {0.0, 0.0, 1.0}}
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},
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{
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{{ 1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}},
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{{ 1.0, 0.0, 0.0}, {0.0, -1.0, 0.0}},
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{{-1.0, 0.0, 0.0}, {0.0, -1.0, 0.0}},
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{{-1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}}
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}
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};
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}
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//----------------------------------------------------------------------
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// Creates a follower with no camera set
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vtkProp3DAxisFollower::vtkProp3DAxisFollower()
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{
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this->AutoCenter = 1;
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this->EnableDistanceLOD = 0;
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this->DistanceLODThreshold = 0.80;
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this->EnableViewAngleLOD = 1;
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this->ViewAngleLODThreshold = 0.34;
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this->ScreenOffsetVector[0] = 0.0;
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this->ScreenOffsetVector[1] = 10.0;
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this->Axis = NULL;
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this->Viewport = NULL;
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this->TextUpsideDown = -1;
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this->VisibleAtCurrentViewAngle = -1;
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}
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//----------------------------------------------------------------------
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vtkProp3DAxisFollower::~vtkProp3DAxisFollower()
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{
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}
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//----------------------------------------------------------------------
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void vtkProp3DAxisFollower::SetAxis(vtkAxisActor *axis)
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{
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if(!axis)
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{
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vtkErrorMacro("Invalid or NULL axis\n");
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return;
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}
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if(this->Axis != axis)
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{
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// \NOTE: Don't increment the ref count of axis as it could lead to
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// circular references.
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this->Axis = axis;
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this->Modified();
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}
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}
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//----------------------------------------------------------------------
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vtkAxisActor* vtkProp3DAxisFollower::GetAxis()
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{
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return this->Axis.GetPointer();
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}
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//----------------------------------------------------------------------
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void vtkProp3DAxisFollower::SetViewport(vtkViewport* vp)
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{
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if(this->Viewport != vp)
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{
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// \NOTE: Don't increment the ref count of vtkViewport as it could lead to
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// circular references.
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this->Viewport = vp;
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this->Modified();
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}
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}
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//----------------------------------------------------------------------
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vtkViewport* vtkProp3DAxisFollower::GetViewport()
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{
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return this->Viewport.GetPointer();
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}
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//----------------------------------------------------------------------------
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void vtkProp3DAxisFollower::CalculateOrthogonalVectors(double rX[3], double rY[3],
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double rZ[3], vtkAxisActor *axis, double *dop, vtkViewport *viewport)
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{
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if (!rX || !rY || !rZ)
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{
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vtkErrorMacro("Invalid or NULL direction vectors\n");
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return;
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}
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if (!axis)
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{
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vtkErrorMacro("Invalid or NULL axis\n");
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return;
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}
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if (!dop)
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{
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vtkErrorMacro("Invalid or NULL direction of projection vector\n");
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return;
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}
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if (!viewport)
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{
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vtkErrorMacro("Invalid or NULL renderer\n");
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return;
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}
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vtkMatrix4x4* cameraMatrix = this->Camera->GetViewTransformMatrix();
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vtkCoordinate *c1Axis = axis->GetPoint1Coordinate();
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vtkCoordinate *c2Axis = axis->GetPoint2Coordinate();
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double *axisPt1 = c1Axis->GetComputedWorldValue(viewport);
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double *axisPt2 = c2Axis->GetComputedWorldValue(viewport);
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rX[0] = axisPt2[0] - axisPt1[0];
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rX[1] = axisPt2[1] - axisPt1[1];
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rX[2] = axisPt2[2] - axisPt1[2];
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vtkMath::Normalize(rX);
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if (rX[0] != dop[0] || rX[1] != dop[1] || rX[2] != dop[2])
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{
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// Get Y
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vtkMath::Cross(rX, dop, rY);
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vtkMath::Normalize(rY);
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// Get Z
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vtkMath::Cross(rX, rY, rZ);
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vtkMath::Normalize(rZ);
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}
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else
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{
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vtkMath::Perpendiculars(rX, rY, rZ, 0.);
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}
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double a[3], b[3];
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// Need homogeneous points.
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double homoPt1[4] = {axisPt1[0], axisPt1[1], axisPt1[2], 1.0};
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double homoPt2[4] = {axisPt2[0], axisPt2[1], axisPt2[2], 1.0};
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double *viewCoordinatePt1 = cameraMatrix->MultiplyDoublePoint(homoPt1);
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a[0] = viewCoordinatePt1[0];
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a[1] = viewCoordinatePt1[1];
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a[2] = viewCoordinatePt1[2];
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double *viewCoordinatePt2 = cameraMatrix->MultiplyDoublePoint(homoPt2);
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b[0] = viewCoordinatePt2[0];
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b[1] = viewCoordinatePt2[1];
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b[2] = viewCoordinatePt2[2];
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// If the text is upside down, we make a 180 rotation to keep it readable.
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if(this->IsTextUpsideDown(a, b))
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{
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this->TextUpsideDown = 1;
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rX[0] = -rX[0];
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rX[1] = -rX[1];
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rX[2] = -rX[2];
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rZ[0] = -rZ[0];
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rZ[1] = -rZ[1];
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rZ[2] = -rZ[2];
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}
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else
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{
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this->TextUpsideDown = 0;
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}
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}
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//----------------------------------------------------------------------------
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double vtkProp3DAxisFollower::AutoScale(vtkViewport *viewport, vtkCamera *camera,
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double screenSize, double position[3])
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{
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double newScale = 0.0;
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if(!viewport)
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{
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std::cerr << "Invalid or NULL viewport \n";
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return newScale;
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}
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if(!camera)
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{
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std::cerr << "Invalid or NULL camera \n";
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return newScale;
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}
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if(!position)
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{
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std::cerr << "Invalid or NULL position \n";
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return newScale;
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}
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double factor = 1;
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if (viewport->GetSize()[1] > 0)
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{
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factor = 2.0 * screenSize
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* tan(vtkMath::RadiansFromDegrees(camera->GetViewAngle()/2.0))
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/ viewport->GetSize()[1];
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}
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double dist = sqrt(
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vtkMath::Distance2BetweenPoints(position,
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camera->GetPosition()));
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newScale = factor * dist;
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return newScale;
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}
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//----------------------------------------------------------------------------
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void vtkProp3DAxisFollower::ComputeMatrix()
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{
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if(!this->Axis)
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{
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vtkErrorMacro("ERROR: Invalid axis\n");
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return;
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}
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if (this->EnableDistanceLOD && !this->TestDistanceVisibility())
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{
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this->SetVisibility(0);
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return;
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}
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// check whether or not need to rebuild the matrix
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if ( this->GetMTime() > this->MatrixMTime ||
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(this->Camera && this->Camera->GetMTime() > this->MatrixMTime) )
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{
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this->GetOrientation();
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this->Transform->Push();
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this->Transform->Identity();
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this->Transform->PostMultiply();
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this->Transform->GetMatrix(this->Matrix);
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double pivotPoint[3] =
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{
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this->Origin[0],
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this->Origin[1],
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this->Origin[2]
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};
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if(this->AutoCenter)
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{
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// Don't apply the user matrix when retrieving the center.
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this->Device->SetUserMatrix(NULL);
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double* center = this->Device->GetCenter();
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pivotPoint[0] = center[0];
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pivotPoint[1] = center[1];
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pivotPoint[2] = center[2];
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}
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// Move pivot point to origin
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this->Transform->Translate(-pivotPoint[0],
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-pivotPoint[1],
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-pivotPoint[2]);
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// Scale
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this->Transform->Scale(this->Scale[0],
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this->Scale[1],
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this->Scale[2]);
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// Rotate
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this->Transform->RotateY(this->Orientation[1]);
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this->Transform->RotateX(this->Orientation[0]);
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this->Transform->RotateZ(this->Orientation[2]);
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double translation[3] = {0.0, 0.0, 0.0};
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if (this->Axis)
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{
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vtkMatrix4x4 *matrix = this->InternalMatrix;
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matrix->Identity();
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double rX[3], rY[3], rZ[3];
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this->ComputeRotationAndTranlation(this->Viewport, translation, rX, rY, rZ, this->Axis);
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vtkMath::Normalize(rX);
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vtkMath::Normalize(rY);
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vtkMath::Normalize(rZ);
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matrix->Element[0][0] = rX[0];
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matrix->Element[1][0] = rX[1];
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matrix->Element[2][0] = rX[2];
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matrix->Element[0][1] = rY[0];
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matrix->Element[1][1] = rY[1];
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matrix->Element[2][1] = rY[2];
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matrix->Element[0][2] = rZ[0];
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matrix->Element[1][2] = rZ[1];
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matrix->Element[2][2] = rZ[2];
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this->Transform->Concatenate(matrix);
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}
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this->Transform->Translate(this->Origin[0] + this->Position[0] + translation[0],
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this->Origin[1] + this->Position[1] + translation[1],
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this->Origin[2] + this->Position[2] + translation[2]);
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// Apply user defined matrix last if there is one
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if (this->UserMatrix)
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{
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this->Transform->Concatenate(this->UserMatrix);
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}
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this->Transform->PreMultiply();
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this->Transform->GetMatrix(this->Matrix);
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this->MatrixMTime.Modified();
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this->Transform->Pop();
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}
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this->SetVisibility(this->VisibleAtCurrentViewAngle);
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}
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//-----------------------------------------------------------------------------
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void vtkProp3DAxisFollower
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::ComputeRotationAndTranlation(vtkViewport* viewport, double translation[3],
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double rX[3], double rY[3], double rZ[3],
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vtkAxisActor *axis)
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{
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double autoScaleHoriz =
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this->AutoScale(viewport, this->Camera, this->ScreenOffsetVector[0], this->Position);
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double autoScaleVert =
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this->AutoScale(viewport, this->Camera, this->ScreenOffsetVector[1], this->Position);
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double dop[3];
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this->Camera->GetDirectionOfProjection(dop);
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vtkMath::Normalize(dop);
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this->CalculateOrthogonalVectors(rX, rY, rZ, axis, dop, viewport);
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double dotVal = vtkMath::Dot(rZ, dop);
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double origRx[3] = {rX[0], rX[1], rX[2]};
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double origRy[3] = {rY[0], rY[1], rY[2]};
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// NOTE: Basically the idea here is that dotVal will be positive
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// only when we have projection direction aligned with our z directon
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// and when that happens it means that our Y is inverted.
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if(dotVal > 0)
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{
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rY[0] = -rY[0];
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rY[1] = -rY[1];
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rY[2] = -rY[2];
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}
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// Check visibility at current view angle.
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if(this->EnableViewAngleLOD)
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{
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this->ExecuteViewAngleVisibility(rZ);
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}
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// Since we already stored all the possible Y axes that are geometry aligned,
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// we compare our vertical vector with these vectors and if it aligns then we
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// translate in opposite direction.
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int axisPosition = this->Axis->GetAxisPosition();
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int vertSign;
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double vertDotVal1 = vtkMath::Dot(AxisAlignedY[this->Axis->GetAxisType()][axisPosition][0], origRy) ;
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double vertDotVal2 = vtkMath::Dot(AxisAlignedY[this->Axis->GetAxisType()][axisPosition][1], origRy) ;
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if(fabs(vertDotVal1) > fabs(vertDotVal2))
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{
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vertSign = (vertDotVal1 > 0 ? -1 : 1);
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}
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else
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{
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vertSign = (vertDotVal2 > 0 ? -1 : 1);
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}
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int horizSign = this->TextUpsideDown ? -1 : 1;
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translation[0] = origRy[0] * autoScaleVert * vertSign + origRx[0] * autoScaleHoriz * horizSign;
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translation[1] = origRy[1] * autoScaleVert * vertSign + origRx[1] * autoScaleHoriz * horizSign;
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translation[2] = origRy[2] * autoScaleVert * vertSign + origRx[2] * autoScaleHoriz * horizSign;
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}
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//----------------------------------------------------------------------
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void vtkProp3DAxisFollower::ComputerAutoCenterTranslation(
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const double& vtkNotUsed(autoScaleFactor), double translation[3])
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{
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if(!translation)
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{
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vtkErrorMacro("ERROR: Invalid or NULL translation\n");
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return;
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}
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double *bounds = this->GetProp3D()->GetBounds();
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// Offset by half of width.
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double halfWidth = (bounds[1] - bounds[0]) * 0.5 * this->Scale[0];
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if(this->TextUpsideDown == 1)
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{
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halfWidth = -halfWidth;
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}
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if(this->Axis->GetAxisType() == vtkAxisActor::VTK_AXIS_TYPE_X)
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{
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translation[0] = translation[0] - halfWidth;
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}
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else if(this->Axis->GetAxisType() == vtkAxisActor::VTK_AXIS_TYPE_Y)
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{
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translation[1] = translation[1] - halfWidth;
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}
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else if(this->Axis->GetAxisType() == vtkAxisActor::VTK_AXIS_TYPE_Z)
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{
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translation[2] = translation[2] - halfWidth;
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}
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else
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{
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// Do nothing.
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}
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return;
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}
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//----------------------------------------------------------------------
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int vtkProp3DAxisFollower::TestDistanceVisibility()
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{
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if(!this->Camera->GetParallelProjection())
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{
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double cameraClippingRange[2];
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this->Camera->GetClippingRange(cameraClippingRange);
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// We are considering the far clip plane for evaluation. In certain
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// odd conditions it might not work.
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const double maxVisibleDistanceFromCamera = this->DistanceLODThreshold * (cameraClippingRange[1]);
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double dist = sqrt(vtkMath::Distance2BetweenPoints(this->Camera->GetPosition(),
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this->Position));
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if(dist > maxVisibleDistanceFromCamera)
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{
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// Need to make sure we are not looking at a flat axis and therefore should enable it anyway
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if(this->Axis)
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{
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vtkBoundingBox bbox(this->Axis->GetBounds());
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return (bbox.GetDiagonalLength() > (cameraClippingRange[1] - cameraClippingRange[0])) ? 1 : 0;
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}
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return 0;
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}
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else
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{
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return 1;
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}
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}
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else
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{
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return 1;
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}
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}
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//----------------------------------------------------------------------
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void vtkProp3DAxisFollower::ExecuteViewAngleVisibility(double normal[3])
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{
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if(!normal)
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{
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vtkErrorMacro("ERROR: Invalid or NULL normal\n");
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return;
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}
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double *cameraPos = this->Camera->GetPosition();
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double dir[3] = {this->Position[0] - cameraPos[0],
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this->Position[1] - cameraPos[1],
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this->Position[2] - cameraPos[2]};
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vtkMath::Normalize(dir);
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double dotDir = vtkMath::Dot(dir, normal);
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if( fabs(dotDir) < this->ViewAngleLODThreshold )
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{
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this->VisibleAtCurrentViewAngle = 0;
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}
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else
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{
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this->VisibleAtCurrentViewAngle = 1;
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}
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}
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//----------------------------------------------------------------------
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void vtkProp3DAxisFollower::PrintSelf(ostream& os, vtkIndent indent)
|
|
{
|
|
this->Superclass::PrintSelf(os,indent);
|
|
|
|
os << indent << "AutoCenter: (" << this->AutoCenter << ")\n";
|
|
os << indent << "EnableDistanceLOD: (" << this->EnableDistanceLOD << ")\n";
|
|
os << indent << "DistanceLODThreshold: (" << this->DistanceLODThreshold << ")\n";
|
|
os << indent << "EnableViewAngleLOD: (" << this->EnableViewAngleLOD << ")\n";
|
|
os << indent << "ViewAngleLODThreshold: (" << this->ViewAngleLODThreshold << ")\n";
|
|
os << indent << "ScreenOffsetVector: ("<< this->ScreenOffsetVector[0] << " " << this->ScreenOffsetVector[1] << ")\n";
|
|
|
|
if ( this->Axis )
|
|
{
|
|
os << indent << "Axis: (" << this->Axis << ")\n";
|
|
}
|
|
else
|
|
{
|
|
os << indent << "Axis: (none)\n";
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
void vtkProp3DAxisFollower::ShallowCopy(vtkProp *prop)
|
|
{
|
|
vtkProp3DAxisFollower *f = vtkProp3DAxisFollower::SafeDownCast(prop);
|
|
if ( f != NULL )
|
|
{
|
|
this->SetAutoCenter(f->GetAutoCenter());
|
|
this->SetEnableDistanceLOD(f->GetEnableDistanceLOD());
|
|
this->SetDistanceLODThreshold(f->GetDistanceLODThreshold());
|
|
this->SetEnableViewAngleLOD(f->GetEnableViewAngleLOD());
|
|
this->SetViewAngleLODThreshold(f->GetViewAngleLODThreshold());
|
|
this->SetScreenOffsetVector(f->GetScreenOffsetVector());
|
|
this->SetAxis(f->GetAxis());
|
|
}
|
|
|
|
// Now do superclass
|
|
this->Superclass::ShallowCopy(prop);
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
bool vtkProp3DAxisFollower::IsTextUpsideDown( double* a, double* b )
|
|
{
|
|
double angle = vtkMath::RadiansFromDegrees(this->Orientation[2]);
|
|
return (b[0] - a[0]) * cos(angle) - (b[1] - a[1]) * sin(angle) < 0;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
void vtkProp3DAxisFollower::SetScreenOffset(double offset)
|
|
{
|
|
this->SetScreenOffsetVector(1, offset);
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
double vtkProp3DAxisFollower::GetScreenOffset()
|
|
{
|
|
return this->GetScreenOffsetVector()[1];
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
int vtkProp3DAxisFollower::RenderOpaqueGeometry(vtkViewport *viewport)
|
|
{
|
|
this->SetViewport(viewport);
|
|
return this->Superclass::RenderOpaqueGeometry(viewport);
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
int vtkProp3DAxisFollower::RenderTranslucentPolygonalGeometry(vtkViewport *viewport)
|
|
{
|
|
this->SetViewport(viewport);
|
|
return this->Superclass::RenderTranslucentPolygonalGeometry(viewport);
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
int vtkProp3DAxisFollower::RenderVolumetricGeometry(vtkViewport *viewport)
|
|
{
|
|
this->SetViewport(viewport);
|
|
return this->Superclass::RenderVolumetricGeometry(viewport);
|
|
}
|