[3479] | 1 | /*========================================================================= |
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| 2 | |
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| 3 | Program: Visualization Toolkit |
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| 4 | Module: vtkRpAxisFollower.cxx |
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| 5 | |
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| 6 | Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen |
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| 7 | All rights reserved. |
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| 8 | See Copyright.txt or http://www.kitware.com/Copyright.htm for details. |
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| 9 | |
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| 10 | This software is distributed WITHOUT ANY WARRANTY; without even |
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| 11 | the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR |
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| 12 | PURPOSE. See the above copyright notice for more information. |
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| 13 | |
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| 14 | =========================================================================*/ |
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| 15 | |
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| 16 | #include "vtkRpAxisFollower.h" |
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| 17 | |
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| 18 | #include "vtkRpAxisActor.h" |
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| 19 | #include "vtkBoundingBox.h" |
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| 20 | #include "vtkCamera.h" |
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| 21 | #include "vtkCoordinate.h" |
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| 22 | #include "vtkMath.h" |
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| 23 | #include "vtkMatrix4x4.h" |
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| 24 | #include "vtkObjectFactory.h" |
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| 25 | #include "vtkPolyDataMapper.h" |
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| 26 | #include "vtkProperty.h" |
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| 27 | #include "vtkRenderer.h" |
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| 28 | #include "vtkTexture.h" |
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| 29 | #include "vtkTransform.h" |
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| 30 | |
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| 31 | #include <math.h> |
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| 32 | |
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| 33 | vtkStandardNewMacro(vtkRpAxisFollower); |
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| 34 | |
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| 35 | // List of vectors per axis (depending on which one needs to be |
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| 36 | // followed. |
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| 37 | // Order here is X, Y, and Z. |
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| 38 | // Set of two axis aligned vectors that would define the Y vector. |
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| 39 | // Order is MINMIN, MINMAX, MAXMAX, MAXMIN |
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| 40 | namespace |
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| 41 | { |
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| 42 | const double AxisAlignedY[3][4][2][3] = |
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| 43 | { |
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| 44 | { {{0.0, 1.0, 0.0}, {0.0, 0.0, 1.0}}, |
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| 45 | {{0.0, 1.0, 0.0}, {0.0, 0.0, -1.0}}, |
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| 46 | {{0.0, -1.0, 0.0}, {0.0, 0.0, -1.0}}, |
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| 47 | {{0.0, -1.0, 0.0}, {0.0, 0.0, 1.0}} |
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| 48 | }, |
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| 49 | { |
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| 50 | {{ 1.0, 0.0, 0.0}, {0.0, 0.0, 1.0}}, |
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| 51 | {{ 1.0, 0.0, 0.0}, {0.0, 0.0, -1.0}}, |
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| 52 | {{-1.0, 0.0, 0.0}, {0.0, 0.0, -1.0}}, |
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| 53 | {{-1.0, 0.0, 0.0}, {0.0, 0.0, 1.0}} |
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| 54 | }, |
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| 55 | { |
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| 56 | {{ 1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}}, |
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| 57 | {{ 1.0, 0.0, 0.0}, {0.0, -1.0, 0.0}}, |
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| 58 | {{-1.0, 0.0, 0.0}, {0.0, -1.0, 0.0}}, |
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| 59 | {{-1.0, 0.0, 0.0}, {0.0, 1.0, 0.0}} |
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| 60 | } |
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| 61 | }; |
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| 62 | } |
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| 63 | |
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| 64 | //---------------------------------------------------------------------- |
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| 65 | // Creates a follower with no camera set |
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| 66 | vtkRpAxisFollower::vtkRpAxisFollower() : vtkFollower() |
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| 67 | { |
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| 68 | this->AutoCenter = 1; |
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| 69 | |
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| 70 | this->EnableDistanceLOD = 0; |
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| 71 | this->DistanceLODThreshold = 0.80; |
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| 72 | |
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| 73 | this->EnableViewAngleLOD = 1; |
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| 74 | this->ViewAngleLODThreshold = 0.34; |
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| 75 | |
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| 76 | this->ScreenOffset = 10.0; |
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| 77 | |
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| 78 | this->Axis = NULL; |
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| 79 | |
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| 80 | this->TextUpsideDown = -1; |
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| 81 | this->VisibleAtCurrentViewAngle = -1; |
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| 82 | |
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| 83 | this->InternalMatrix = vtkMatrix4x4::New(); |
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| 84 | } |
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| 85 | |
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| 86 | //---------------------------------------------------------------------- |
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| 87 | vtkRpAxisFollower::~vtkRpAxisFollower() |
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| 88 | { |
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| 89 | this->InternalMatrix->Delete(); |
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| 90 | } |
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| 91 | |
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| 92 | //---------------------------------------------------------------------- |
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| 93 | void vtkRpAxisFollower::SetAxis(vtkRpAxisActor *axis) |
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| 94 | { |
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| 95 | if(!axis) |
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| 96 | { |
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| 97 | vtkErrorMacro("Invalid or NULL axis\n"); |
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| 98 | return; |
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| 99 | } |
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| 100 | |
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| 101 | if(this->Axis != axis) |
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| 102 | { |
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| 103 | // \NOTE: Don't increment the ref count of axis as it could lead to |
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| 104 | // circular references. |
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| 105 | this->Axis = axis; |
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| 106 | this->Modified(); |
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| 107 | } |
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| 108 | } |
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| 109 | |
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| 110 | //---------------------------------------------------------------------- |
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| 111 | vtkRpAxisActor* vtkRpAxisFollower::GetAxis() |
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| 112 | { |
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| 113 | return this->Axis.GetPointer(); |
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| 114 | } |
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| 115 | |
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| 116 | //---------------------------------------------------------------------------- |
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| 117 | void vtkRpAxisFollower::CalculateOrthogonalVectors(double rX[3], double rY[3], |
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| 118 | double rZ[3], vtkRpAxisActor *axis, double *dop, vtkRenderer *ren) |
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| 119 | { |
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| 120 | if(!rX || !rY || !rZ) |
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| 121 | { |
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| 122 | vtkErrorMacro("Invalid or NULL direction vectors\n"); |
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| 123 | return; |
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| 124 | } |
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| 125 | |
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| 126 | if(!axis) |
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| 127 | { |
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| 128 | vtkErrorMacro("Invalid or NULL axis\n"); |
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| 129 | return; |
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| 130 | } |
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| 131 | |
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| 132 | if(!dop) |
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| 133 | { |
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| 134 | vtkErrorMacro("Invalid or NULL direction of projection vector\n"); |
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| 135 | return; |
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| 136 | } |
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| 137 | |
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| 138 | if(!ren) |
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| 139 | { |
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| 140 | vtkErrorMacro("Invalid or NULL renderer\n"); |
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| 141 | return; |
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| 142 | } |
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| 143 | |
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| 144 | vtkMatrix4x4* cameraMatrix = this->Camera->GetViewTransformMatrix(); |
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| 145 | |
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| 146 | vtkCoordinate *c1Axis = axis->GetPoint1Coordinate(); |
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| 147 | vtkCoordinate *c2Axis = axis->GetPoint2Coordinate(); |
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| 148 | double *axisPt1 = c1Axis->GetComputedWorldValue(ren); |
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| 149 | double *axisPt2 = c2Axis->GetComputedWorldValue(ren); |
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| 150 | |
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| 151 | rX[0] = axisPt2[0] - axisPt1[0]; |
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| 152 | rX[1] = axisPt2[1] - axisPt1[1]; |
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| 153 | rX[2] = axisPt2[2] - axisPt1[2]; |
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| 154 | vtkMath::Normalize(rX); |
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| 155 | |
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| 156 | // Get Y |
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| 157 | vtkMath::Cross(rX, dop, rY); |
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| 158 | vtkMath::Normalize(rY); |
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| 159 | |
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| 160 | // Get Z |
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| 161 | vtkMath::Cross(rX, rY, rZ); |
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| 162 | vtkMath::Normalize(rZ); |
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| 163 | |
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| 164 | double a[3], b[3]; |
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| 165 | |
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| 166 | // Need homogeneous points. |
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| 167 | double homoPt1[4] = {axisPt1[0], axisPt1[1], axisPt1[2], 1.0}; |
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| 168 | double homoPt2[4] = {axisPt2[0], axisPt2[1], axisPt2[2], 1.0}; |
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| 169 | |
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| 170 | double *viewCoordinatePt1 = cameraMatrix->MultiplyDoublePoint(homoPt1); |
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| 171 | a[0] = viewCoordinatePt1[0]; |
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| 172 | a[1] = viewCoordinatePt1[1]; |
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| 173 | a[2] = viewCoordinatePt1[2]; |
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| 174 | |
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| 175 | double *viewCoordinatePt2 = cameraMatrix->MultiplyDoublePoint(homoPt2); |
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| 176 | b[0] = viewCoordinatePt2[0]; |
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| 177 | b[1] = viewCoordinatePt2[1]; |
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| 178 | b[2] = viewCoordinatePt2[2]; |
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| 179 | |
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| 180 | // If the text is upside down, we make a 180 rotation to keep it readable. |
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| 181 | if(this->IsTextUpsideDown(a, b)) |
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| 182 | { |
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| 183 | this->TextUpsideDown = 1; |
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| 184 | rX[0] = -rX[0]; |
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| 185 | rX[1] = -rX[1]; |
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| 186 | rX[2] = -rX[2]; |
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| 187 | rZ[0] = -rZ[0]; |
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| 188 | rZ[1] = -rZ[1]; |
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| 189 | rZ[2] = -rZ[2]; |
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| 190 | } |
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| 191 | else |
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| 192 | { |
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| 193 | this->TextUpsideDown = 0; |
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| 194 | } |
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| 195 | } |
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| 196 | |
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| 197 | //---------------------------------------------------------------------------- |
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| 198 | double vtkRpAxisFollower::AutoScale(vtkViewport *viewport, vtkCamera *camera, |
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| 199 | double screenSize, double position[3]) |
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| 200 | { |
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| 201 | double newScale = 0.0; |
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| 202 | |
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| 203 | if(!viewport) |
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| 204 | { |
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| 205 | std::cerr << "Invalid or NULL viewport \n"; |
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| 206 | return newScale; |
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| 207 | } |
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| 208 | |
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| 209 | if(!camera) |
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| 210 | { |
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| 211 | std::cerr << "Invalid or NULL camera \n"; |
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| 212 | return newScale; |
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| 213 | } |
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| 214 | |
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| 215 | if(!position) |
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| 216 | { |
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| 217 | std::cerr << "Invalid or NULL position \n"; |
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| 218 | return newScale; |
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| 219 | } |
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| 220 | |
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| 221 | double factor = 1; |
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| 222 | if (viewport->GetSize()[1] > 0) |
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| 223 | { |
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| 224 | factor = 2.0 * screenSize |
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| 225 | * tan(vtkMath::RadiansFromDegrees(camera->GetViewAngle()/2.0)) |
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| 226 | / viewport->GetSize()[1]; |
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| 227 | } |
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| 228 | |
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| 229 | double dist = sqrt( |
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| 230 | vtkMath::Distance2BetweenPoints(position, |
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| 231 | camera->GetPosition())); |
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| 232 | newScale = factor * dist; |
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| 233 | |
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| 234 | return newScale; |
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| 235 | } |
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| 236 | |
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| 237 | //---------------------------------------------------------------------------- |
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| 238 | void vtkRpAxisFollower::ComputeTransformMatrix(vtkRenderer *ren) |
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| 239 | { |
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| 240 | if(!this->Axis) |
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| 241 | { |
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| 242 | vtkErrorMacro("ERROR: Invalid axis\n"); |
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| 243 | return; |
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| 244 | } |
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| 245 | |
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| 246 | // check whether or not need to rebuild the matrix |
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| 247 | if ( this->GetMTime() > this->MatrixMTime || |
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| 248 | (this->Camera && this->Camera->GetMTime() > this->MatrixMTime) ) |
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| 249 | { |
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| 250 | this->GetOrientation(); |
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| 251 | this->Transform->Push(); |
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| 252 | this->Transform->Identity(); |
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| 253 | this->Transform->PostMultiply(); |
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| 254 | |
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| 255 | double pivotPoint[3] = |
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| 256 | { |
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| 257 | this->Origin[0], |
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| 258 | this->Origin[1], |
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| 259 | this->Origin[2] |
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| 260 | }; |
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| 261 | |
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| 262 | if(this->AutoCenter) |
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| 263 | { |
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| 264 | this->GetMapper()->GetCenter(pivotPoint); |
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| 265 | } |
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| 266 | |
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| 267 | // Move pivot point to origin |
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| 268 | this->Transform->Translate(-pivotPoint[0], |
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| 269 | -pivotPoint[1], |
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| 270 | -pivotPoint[2]); |
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| 271 | // Scale |
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| 272 | this->Transform->Scale(this->Scale[0], |
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| 273 | this->Scale[1], |
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| 274 | this->Scale[2]); |
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| 275 | |
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| 276 | // Rotate |
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| 277 | this->Transform->RotateY(this->Orientation[1]); |
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| 278 | this->Transform->RotateX(this->Orientation[0]); |
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| 279 | this->Transform->RotateZ(this->Orientation[2]); |
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| 280 | |
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| 281 | double translation[3] = {0.0, 0.0, 0.0}; |
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| 282 | if (this->Axis) |
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| 283 | { |
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| 284 | vtkMatrix4x4 *matrix = this->InternalMatrix; |
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| 285 | matrix->Identity(); |
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| 286 | double rX[3], rY[3], rZ[3]; |
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| 287 | |
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| 288 | this->ComputeRotationAndTranlation(ren, translation, rX, rY, rZ, this->Axis); |
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| 289 | |
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| 290 | vtkMath::Normalize(rX); |
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| 291 | vtkMath::Normalize(rY); |
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| 292 | vtkMath::Normalize(rZ); |
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| 293 | |
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| 294 | matrix->Element[0][0] = rX[0]; |
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| 295 | matrix->Element[1][0] = rX[1]; |
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| 296 | matrix->Element[2][0] = rX[2]; |
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| 297 | matrix->Element[0][1] = rY[0]; |
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| 298 | matrix->Element[1][1] = rY[1]; |
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| 299 | matrix->Element[2][1] = rY[2]; |
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| 300 | matrix->Element[0][2] = rZ[0]; |
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| 301 | matrix->Element[1][2] = rZ[1]; |
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| 302 | matrix->Element[2][2] = rZ[2]; |
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| 303 | |
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| 304 | this->Transform->Concatenate(matrix); |
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| 305 | } |
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| 306 | |
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| 307 | this->Transform->Translate(this->Origin[0] + this->Position[0] + translation[0], |
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| 308 | this->Origin[1] + this->Position[1] + translation[1], |
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| 309 | this->Origin[2] + this->Position[2] + translation[2]); |
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| 310 | |
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| 311 | // Apply user defined matrix last if there is one |
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| 312 | if (this->UserMatrix) |
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| 313 | { |
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| 314 | this->Transform->Concatenate(this->UserMatrix); |
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| 315 | } |
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| 316 | |
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| 317 | this->Transform->PreMultiply(); |
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| 318 | this->Transform->GetMatrix(this->Matrix); |
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| 319 | this->MatrixMTime.Modified(); |
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| 320 | this->Transform->Pop(); |
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| 321 | } |
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| 322 | } |
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| 323 | |
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| 324 | //----------------------------------------------------------------------------- |
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| 325 | void vtkRpAxisFollower::ComputeRotationAndTranlation(vtkRenderer *ren, double translation[3], |
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| 326 | double rX[3], double rY[3], double rZ[3], |
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| 327 | vtkRpAxisActor *axis) |
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| 328 | { |
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| 329 | double autoScaleFactor = |
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| 330 | this->AutoScale(ren, this->Camera, this->ScreenOffset, this->Position); |
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| 331 | |
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| 332 | double dop[3]; |
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| 333 | this->Camera->GetDirectionOfProjection(dop); |
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| 334 | vtkMath::Normalize(dop); |
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| 335 | |
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| 336 | this->CalculateOrthogonalVectors(rX, rY, rZ, axis, dop, ren); |
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| 337 | |
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| 338 | double dotVal = vtkMath::Dot(rZ, dop); |
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| 339 | |
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| 340 | double origRy[3] = {0.0, 0.0, 0.0}; |
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| 341 | |
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| 342 | origRy[0] = rY[0]; |
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| 343 | origRy[1] = rY[1]; |
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| 344 | origRy[2] = rY[2]; |
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| 345 | |
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| 346 | // NOTE: Basically the idea here is that dotVal will be positive |
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| 347 | // only when we have projection direction aligned with our z directon |
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| 348 | // and when that happens it means that our Y is inverted. |
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| 349 | if(dotVal > 0) |
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| 350 | { |
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| 351 | rY[0] = -rY[0]; |
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| 352 | rY[1] = -rY[1]; |
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| 353 | rY[2] = -rY[2]; |
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| 354 | } |
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| 355 | |
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| 356 | // Check visibility at current view angle. |
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| 357 | if(this->EnableViewAngleLOD) |
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| 358 | { |
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| 359 | this->ExecuteViewAngleVisibility(rZ); |
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| 360 | } |
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| 361 | |
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| 362 | // Since we already stored all the possible Y axes that are geometry aligned, |
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| 363 | // we compare our vertical vector with these vectors and if it aligns then we |
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| 364 | // translate in opposite direction. |
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| 365 | int axisPosition = this->Axis->GetAxisPosition(); |
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| 366 | |
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| 367 | double dotVal1 = vtkMath::Dot(AxisAlignedY[this->Axis->GetAxisType()][axisPosition][0], origRy) ; |
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| 368 | double dotVal2 = vtkMath::Dot(AxisAlignedY[this->Axis->GetAxisType()][axisPosition][1], origRy) ; |
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| 369 | |
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| 370 | if(fabs(dotVal1) > fabs(dotVal2)) |
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| 371 | { |
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| 372 | int sign = (dotVal1 > 0 ? -1 : 1); |
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| 373 | |
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| 374 | translation[0] = origRy[0] * autoScaleFactor * sign; |
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| 375 | translation[1] = origRy[1] * autoScaleFactor * sign; |
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| 376 | translation[2] = origRy[2] * autoScaleFactor * sign; |
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| 377 | } |
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| 378 | else |
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| 379 | { |
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| 380 | int sign = (dotVal2 > 0 ? -1 : 1); |
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| 381 | |
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| 382 | translation[0] = origRy[0] * autoScaleFactor * sign; |
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| 383 | translation[1] = origRy[1] * autoScaleFactor * sign; |
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| 384 | translation[2] = origRy[2] * autoScaleFactor * sign; |
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| 385 | } |
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| 386 | } |
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| 387 | |
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| 388 | //---------------------------------------------------------------------- |
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| 389 | void vtkRpAxisFollower::ComputerAutoCenterTranslation( |
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| 390 | const double& vtkNotUsed(autoScaleFactor), double translation[3]) |
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| 391 | { |
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| 392 | if(!translation) |
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| 393 | { |
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| 394 | vtkErrorMacro("ERROR: Invalid or NULL translation\n"); |
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| 395 | return; |
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| 396 | } |
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| 397 | |
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| 398 | double *bounds = this->GetMapper()->GetBounds(); |
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| 399 | |
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| 400 | // Offset by half of width. |
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| 401 | double halfWidth = (bounds[1] - bounds[0]) * 0.5 * this->Scale[0]; |
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| 402 | |
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| 403 | if(this->TextUpsideDown == 1) |
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| 404 | { |
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| 405 | halfWidth = -halfWidth; |
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| 406 | } |
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| 407 | |
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| 408 | if(this->Axis->GetAxisType() == VTK_AXIS_TYPE_X) |
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| 409 | { |
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| 410 | translation[0] = translation[0] - halfWidth; |
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| 411 | } |
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| 412 | else if(this->Axis->GetAxisType() == VTK_AXIS_TYPE_Y) |
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| 413 | { |
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| 414 | translation[1] = translation[1] - halfWidth; |
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| 415 | } |
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| 416 | else if(this->Axis->GetAxisType() == VTK_AXIS_TYPE_Z) |
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| 417 | { |
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| 418 | translation[2] = translation[2] - halfWidth; |
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| 419 | } |
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| 420 | else |
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| 421 | { |
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| 422 | // Do nothing. |
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| 423 | } |
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| 424 | |
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| 425 | return; |
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| 426 | } |
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| 427 | |
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| 428 | //---------------------------------------------------------------------- |
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| 429 | int vtkRpAxisFollower::TestDistanceVisibility() |
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| 430 | { |
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| 431 | if(!this->Camera->GetParallelProjection()) |
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| 432 | { |
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| 433 | double cameraClippingRange[2]; |
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| 434 | |
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| 435 | this->Camera->GetClippingRange(cameraClippingRange); |
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| 436 | |
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| 437 | // We are considering the far clip plane for evaluation. In certain |
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| 438 | // odd conditions it might not work. |
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| 439 | const double maxVisibleDistanceFromCamera = this->DistanceLODThreshold * (cameraClippingRange[1]); |
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| 440 | |
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| 441 | double dist = sqrt(vtkMath::Distance2BetweenPoints(this->Camera->GetPosition(), |
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| 442 | this->Position)); |
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| 443 | |
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| 444 | if(dist > maxVisibleDistanceFromCamera) |
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| 445 | { |
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| 446 | // Need to make sure we are not looking at a flat axis and therefore should enable it anyway |
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| 447 | if(this->Axis) |
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| 448 | { |
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| 449 | vtkBoundingBox bbox(this->Axis->GetBounds()); |
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| 450 | return (bbox.GetDiagonalLength() > (cameraClippingRange[1] - cameraClippingRange[0])) ? 1 : 0; |
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| 451 | } |
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| 452 | return 0; |
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| 453 | } |
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| 454 | else |
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| 455 | { |
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| 456 | return 1; |
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| 457 | } |
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| 458 | } |
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| 459 | else |
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| 460 | { |
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| 461 | return 1; |
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| 462 | } |
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| 463 | } |
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| 464 | |
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| 465 | //---------------------------------------------------------------------- |
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| 466 | void vtkRpAxisFollower::ExecuteViewAngleVisibility(double normal[3]) |
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| 467 | { |
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| 468 | if(!normal) |
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| 469 | { |
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| 470 | vtkErrorMacro("ERROR: Invalid or NULL normal\n"); |
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| 471 | return; |
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| 472 | } |
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| 473 | |
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| 474 | double *cameraPos = this->Camera->GetPosition(); |
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| 475 | double dir[3] = {this->Position[0] - cameraPos[0], |
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| 476 | this->Position[1] - cameraPos[1], |
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| 477 | this->Position[2] - cameraPos[2]}; |
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| 478 | vtkMath::Normalize(dir); |
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| 479 | double dotDir = vtkMath::Dot(dir, normal); |
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| 480 | if( fabs(dotDir) < this->ViewAngleLODThreshold ) |
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| 481 | { |
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| 482 | this->VisibleAtCurrentViewAngle = 0; |
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| 483 | } |
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| 484 | else |
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| 485 | { |
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| 486 | this->VisibleAtCurrentViewAngle = 1; |
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| 487 | } |
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| 488 | } |
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| 489 | |
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| 490 | //---------------------------------------------------------------------- |
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| 491 | void vtkRpAxisFollower::PrintSelf(ostream& os, vtkIndent indent) |
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| 492 | { |
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| 493 | this->Superclass::PrintSelf(os,indent); |
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| 494 | |
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| 495 | os << indent << "AutoCenter: (" << this->AutoCenter << ")\n"; |
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| 496 | os << indent << "EnableDistanceLOD: (" << this->EnableDistanceLOD << ")\n"; |
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| 497 | os << indent << "DistanceLODThreshold: (" << this->DistanceLODThreshold << ")\n"; |
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| 498 | os << indent << "EnableViewAngleLOD: (" << this->EnableViewAngleLOD << ")\n"; |
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| 499 | os << indent << "ViewAngleLODThreshold: (" << this->ViewAngleLODThreshold << ")\n"; |
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| 500 | os << indent << "ScreenOffset: ("<< this->ScreenOffset << ")\n"; |
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| 501 | |
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| 502 | if ( this->Axis ) |
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| 503 | { |
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| 504 | os << indent << "Axis: (" << this->Axis << ")\n"; |
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| 505 | } |
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| 506 | else |
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| 507 | { |
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| 508 | os << indent << "Axis: (none)\n"; |
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| 509 | } |
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| 510 | } |
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| 511 | |
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| 512 | //---------------------------------------------------------------------- |
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| 513 | int vtkRpAxisFollower::RenderOpaqueGeometry(vtkViewport *vp) |
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| 514 | { |
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| 515 | if ( ! this->Mapper ) |
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| 516 | { |
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| 517 | return 0; |
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| 518 | } |
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| 519 | |
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| 520 | if (!this->Property) |
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| 521 | { |
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| 522 | // force creation of a property |
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| 523 | this->GetProperty(); |
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| 524 | } |
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| 525 | |
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| 526 | if (this->GetIsOpaque()) |
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| 527 | { |
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| 528 | vtkRenderer *ren = static_cast<vtkRenderer *>(vp); |
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| 529 | this->Render(ren); |
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| 530 | return 1; |
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| 531 | } |
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| 532 | return 0; |
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| 533 | } |
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| 534 | |
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| 535 | //----------------------------------------------------------------------------- |
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| 536 | int vtkRpAxisFollower::RenderTranslucentPolygonalGeometry(vtkViewport *vp) |
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| 537 | { |
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| 538 | if ( ! this->Mapper ) |
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| 539 | { |
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| 540 | return 0; |
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| 541 | } |
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| 542 | |
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| 543 | if (!this->Property) |
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| 544 | { |
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| 545 | // force creation of a property |
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| 546 | this->GetProperty(); |
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| 547 | } |
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| 548 | |
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| 549 | if (!this->GetIsOpaque()) |
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| 550 | { |
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| 551 | vtkRenderer *ren = static_cast<vtkRenderer *>(vp); |
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| 552 | this->Render(ren); |
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| 553 | return 1; |
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| 554 | } |
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| 555 | return 0; |
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| 556 | } |
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| 557 | |
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| 558 | //----------------------------------------------------------------------------- |
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| 559 | void vtkRpAxisFollower::Render(vtkRenderer *ren) |
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| 560 | { |
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| 561 | if(this->EnableDistanceLOD && !this->TestDistanceVisibility()) |
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| 562 | { |
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| 563 | this->SetVisibility(0); |
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| 564 | return; |
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| 565 | } |
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| 566 | |
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| 567 | this->Property->Render(this, ren); |
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| 568 | |
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| 569 | this->Device->SetProperty (this->Property); |
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| 570 | this->Property->Render(this, ren); |
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| 571 | if (this->BackfaceProperty) |
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| 572 | { |
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| 573 | this->BackfaceProperty->BackfaceRender(this, ren); |
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| 574 | this->Device->SetBackfaceProperty(this->BackfaceProperty); |
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| 575 | } |
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| 576 | |
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| 577 | /* render the texture */ |
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| 578 | if (this->Texture) |
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| 579 | { |
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| 580 | this->Texture->Render(ren); |
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| 581 | } |
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| 582 | |
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| 583 | // make sure the device has the same matrix |
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| 584 | this->ComputeTransformMatrix(ren); |
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| 585 | this->Device->SetUserMatrix(this->Matrix); |
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| 586 | |
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| 587 | if(this->VisibleAtCurrentViewAngle) |
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| 588 | { |
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| 589 | this->Device->Render(ren,this->Mapper); |
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| 590 | } |
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| 591 | else |
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| 592 | { |
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| 593 | this->SetVisibility(this->VisibleAtCurrentViewAngle); |
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| 594 | } |
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| 595 | } |
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| 596 | |
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| 597 | //---------------------------------------------------------------------- |
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| 598 | void vtkRpAxisFollower::ShallowCopy(vtkProp *prop) |
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| 599 | { |
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| 600 | vtkRpAxisFollower *f = vtkRpAxisFollower::SafeDownCast(prop); |
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| 601 | if ( f != NULL ) |
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| 602 | { |
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| 603 | this->SetAutoCenter(f->GetAutoCenter()); |
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| 604 | this->SetEnableDistanceLOD(f->GetEnableDistanceLOD()); |
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| 605 | this->SetDistanceLODThreshold(f->GetDistanceLODThreshold()); |
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| 606 | this->SetEnableViewAngleLOD(f->GetEnableViewAngleLOD()); |
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| 607 | this->SetViewAngleLODThreshold(f->GetViewAngleLODThreshold()); |
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| 608 | this->SetScreenOffset(f->GetScreenOffset()); |
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| 609 | this->SetAxis(f->GetAxis()); |
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| 610 | } |
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| 611 | |
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| 612 | // Now do superclass |
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| 613 | this->Superclass::ShallowCopy(prop); |
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| 614 | } |
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| 615 | |
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| 616 | bool vtkRpAxisFollower::IsTextUpsideDown( double* a, double* b ) |
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| 617 | { |
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| 618 | double angle = vtkMath::RadiansFromDegrees(this->Orientation[2]); |
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| 619 | return (b[0] - a[0]) * cos(angle) - (b[1] - a[1]) * sin(angle) < 0; |
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| 620 | } |
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