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331 lines
14 KiB
331 lines
14 KiB
/*=========================================================================
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Program: Visualization Toolkit
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Module: $RCSfile: vtkTransform.h,v $
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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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// .NAME vtkTransform - describes linear transformations via a 4x4 matrix
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// .SECTION Description
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// A vtkTransform can be used to describe the full range of linear (also
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// known as affine) coordinate transformations in three dimensions,
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// which are internally represented as a 4x4 homogeneous transformation
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// matrix. When you create a new vtkTransform, it is always initialized
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// to the identity transformation.
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// <P>The SetInput() method allows you to set another transform,
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// instead of the identity transform, to be the base transformation.
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// There is a pipeline mechanism to ensure that when the input is
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// modified, the current transformation will be updated accordingly.
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// This pipeline mechanism is also supported by the Concatenate() method.
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// <P>Most of the methods for manipulating this transformation,
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// e.g. Translate, Rotate, and Concatenate, can operate in either
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// PreMultiply (the default) or PostMultiply mode. In PreMultiply
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// mode, the translation, concatenation, etc. will occur before any
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// transformations which are represented by the current matrix. In
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// PostMultiply mode, the additional transformation will occur after
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// any transformations represented by the current matrix.
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// <P>This class performs all of its operations in a right handed
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// coordinate system with right handed rotations. Some other graphics
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// libraries use left handed coordinate systems and rotations.
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// .SECTION See Also
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// vtkPerspectiveTransform vtkGeneralTransform vtkMatrix4x4
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// vtkTransformCollection vtkTransformFilter vtkTransformPolyDataFilter
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// vtkImageReslice
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#ifndef __vtkTransform_h
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#define __vtkTransform_h
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#include "vtkLinearTransform.h"
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#include "vtkMatrix4x4.h" // Needed for inline methods
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class VTK_COMMON_EXPORT vtkTransform : public vtkLinearTransform
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{
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public:
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static vtkTransform *New();
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vtkTypeRevisionMacro(vtkTransform,vtkLinearTransform);
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void PrintSelf(ostream& os, vtkIndent indent);
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// Description:
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// Set the transformation to the identity transformation. If
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// the transform has an Input, then the transformation will be
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// reset so that it is the same as the Input.
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void Identity();
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// Description:
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// Invert the transformation. This will also set a flag so that
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// the transformation will use the inverse of its Input, if an Input
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// has been set.
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void Inverse();
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// Description:
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// Create a translation matrix and concatenate it with the current
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// transformation according to PreMultiply or PostMultiply semantics.
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void Translate(double x, double y, double z) {
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this->Concatenation->Translate(x,y,z); };
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void Translate(const double x[3]) { this->Translate(x[0], x[1], x[2]); };
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void Translate(const float x[3]) { this->Translate(x[0], x[1], x[2]); };
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// Description:
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// Create a rotation matrix and concatenate it with the current
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// transformation according to PreMultiply or PostMultiply semantics.
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// The angle is in degrees, and (x,y,z) specifies the axis that the
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// rotation will be performed around.
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void RotateWXYZ(double angle, double x, double y, double z) {
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this->Concatenation->Rotate(angle,x,y,z); };
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void RotateWXYZ(double angle, const double axis[3]) {
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this->RotateWXYZ(angle, axis[0], axis[1], axis[2]); };
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void RotateWXYZ(double angle, const float axis[3]) {
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this->RotateWXYZ(angle, axis[0], axis[1], axis[2]); };
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// Description:
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// Create a rotation matrix about the X, Y, or Z axis and concatenate
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// it with the current transformation according to PreMultiply or
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// PostMultiply semantics. The angle is expressed in degrees.
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void RotateX(double angle) { this->RotateWXYZ(angle, 1, 0, 0); };
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void RotateY(double angle) { this->RotateWXYZ(angle, 0, 1, 0); };
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void RotateZ(double angle) { this->RotateWXYZ(angle, 0, 0, 1); };
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// Description:
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// Create a scale matrix (i.e. set the diagonal elements to x, y, z)
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// and concatenate it with the current transformation according to
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// PreMultiply or PostMultiply semantics.
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void Scale(double x, double y, double z) {
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this->Concatenation->Scale(x,y,z); };
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void Scale(const double s[3]) { this->Scale(s[0], s[1], s[2]); };
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void Scale(const float s[3]) { this->Scale(s[0], s[1], s[2]); };
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// Description:
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// Set the current matrix directly. This actually calls Identity(),
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// followed by Concatenate(matrix).
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void SetMatrix(vtkMatrix4x4 *matrix) {
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this->SetMatrix(*matrix->Element); };
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void SetMatrix(const double elements[16]) {
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this->Identity(); this->Concatenate(elements); };
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// Description:
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// Concatenates the matrix with the current transformation according
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// to PreMultiply or PostMultiply semantics.
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void Concatenate(vtkMatrix4x4 *matrix) {
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this->Concatenate(*matrix->Element); };
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void Concatenate(const double elements[16]) {
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this->Concatenation->Concatenate(elements); };
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// Description:
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// Concatenate the specified transform with the current transformation
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// according to PreMultiply or PostMultiply semantics.
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// The concatenation is pipelined, meaning that if any of the
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// transformations are changed, even after Concatenate() is called,
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// those changes will be reflected when you call TransformPoint().
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void Concatenate(vtkLinearTransform *transform);
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// Description:
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// Sets the internal state of the transform to PreMultiply. All subsequent
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// operations will occur before those already represented in the
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// current transformation. In homogeneous matrix notation, M = M*A where
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// M is the current transformation matrix and A is the applied matrix.
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// The default is PreMultiply.
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void PreMultiply() {
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if (this->Concatenation->GetPreMultiplyFlag()) { return; }
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this->Concatenation->SetPreMultiplyFlag(1); this->Modified(); };
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// Description:
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// Sets the internal state of the transform to PostMultiply. All subsequent
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// operations will occur after those already represented in the
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// current transformation. In homogeneous matrix notation, M = A*M where
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// M is the current transformation matrix and A is the applied matrix.
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// The default is PreMultiply.
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void PostMultiply() {
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if (!this->Concatenation->GetPreMultiplyFlag()) { return; }
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this->Concatenation->SetPreMultiplyFlag(0); this->Modified(); };
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// Description:
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// Get the total number of transformations that are linked into this
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// one via Concatenate() operations or via SetInput().
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int GetNumberOfConcatenatedTransforms() {
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return this->Concatenation->GetNumberOfTransforms() +
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(this->Input == NULL ? 0 : 1); };
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// Description
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// Get one of the concatenated transformations as a vtkAbstractTransform.
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// These transformations are applied, in series, every time the
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// transformation of a coordinate occurs. This method is provided
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// to make it possible to decompose a transformation into its
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// constituents, for example to save a transformation to a file.
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vtkLinearTransform *GetConcatenatedTransform(int i) {
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if (this->Input == NULL) {
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return (vtkLinearTransform *)this->Concatenation->GetTransform(i); }
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else if (i < this->Concatenation->GetNumberOfPreTransforms()) {
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return (vtkLinearTransform *)this->Concatenation->GetTransform(i); }
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else if (i > this->Concatenation->GetNumberOfPreTransforms()) {
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return (vtkLinearTransform *)this->Concatenation->GetTransform(i-1); }
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else if (this->GetInverseFlag()) {
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return (vtkLinearTransform *)this->Input->GetInverse(); }
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else {
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return (vtkLinearTransform *)this->Input; } };
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// Description:
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// Get the x, y, z orientation angles from the transformation matrix as an
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// array of three floating point values.
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void GetOrientation(double orient[3]);
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void GetOrientation(float orient[3]) {
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double temp[3]; this->GetOrientation(temp);
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orient[0] = static_cast<float>(temp[0]);
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orient[1] = static_cast<float>(temp[1]);
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orient[2] = static_cast<float>(temp[2]); };
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double *GetOrientation() {
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this->GetOrientation(this->ReturnValue); return this->ReturnValue; };
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// Description:
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// Convenience function to get the x, y, z orientation angles from
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// a transformation matrix as an array of three floating point values.
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static void GetOrientation(double orient[3], vtkMatrix4x4 *matrix);
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// Description:
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// Return the wxyz angle+axis representing the current orientation.
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// The angle is in degrees and the axis is a unit vector.
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void GetOrientationWXYZ(double wxyz[4]);
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void GetOrientationWXYZ(float wxyz[3]) {
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double temp[4]; this->GetOrientationWXYZ(temp);
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wxyz[0]=static_cast<float>(temp[0]);
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wxyz[1]=static_cast<float>(temp[1]);
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wxyz[2]=static_cast<float>(temp[2]);
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wxyz[3]=static_cast<float>(temp[3]);};
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double *GetOrientationWXYZ() {
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this->GetOrientationWXYZ(this->ReturnValue); return this->ReturnValue; };
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// Description:
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// Return the position from the current transformation matrix as an array
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// of three floating point numbers. This is simply returning the translation
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// component of the 4x4 matrix.
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void GetPosition(double pos[3]);
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void GetPosition(float pos[3]) {
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double temp[3]; this->GetPosition(temp);
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pos[0] = static_cast<float>(temp[0]);
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pos[1] = static_cast<float>(temp[1]);
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pos[2] = static_cast<float>(temp[2]); };
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double *GetPosition() {
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this->GetPosition(this->ReturnValue); return this->ReturnValue; };
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// Description:
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// Return the scale factors of the current transformation matrix as
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// an array of three float numbers. These scale factors are not necessarily
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// about the x, y, and z axes unless unless the scale transformation was
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// applied before any rotations.
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void GetScale(double scale[3]);
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void GetScale(float scale[3]) {
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double temp[3]; this->GetScale(temp);
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scale[0] = static_cast<float>(temp[0]);
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scale[1] = static_cast<float>(temp[1]);
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scale[2] = static_cast<float>(temp[2]); };
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double *GetScale() {
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this->GetScale(this->ReturnValue); return this->ReturnValue; };
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// Description:
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// Return a matrix which is the inverse of the current transformation
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// matrix.
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void GetInverse(vtkMatrix4x4 *inverse);
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// Description:
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// Return a matrix which is the transpose of the current transformation
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// matrix. This is equivalent to the inverse if and only if the
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// transformation is a pure rotation with no translation or scale.
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void GetTranspose(vtkMatrix4x4 *transpose);
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// Description:
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// Set the input for this transformation. This will be used as the
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// base transformation if it is set. This method allows you to build
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// a transform pipeline: if the input is modified, then this transformation
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// will automatically update accordingly. Note that the InverseFlag,
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// controlled via Inverse(), determines whether this transformation
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// will use the Input or the inverse of the Input.
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void SetInput(vtkLinearTransform *input);
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vtkLinearTransform *GetInput() { return this->Input; };
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// Description:
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// Get the inverse flag of the transformation. This controls
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// whether it is the Input or the inverse of the Input that
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// is used as the base transformation. The InverseFlag is
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// flipped every time Inverse() is called. The InverseFlag
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// is off when a transform is first created.
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int GetInverseFlag() {
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return this->Concatenation->GetInverseFlag(); };
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// Description:
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// Pushes the current transformation onto the transformation stack.
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void Push() { if (this->Stack == NULL) {
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this->Stack = vtkTransformConcatenationStack::New(); }
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this->Stack->Push(&this->Concatenation);
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this->Modified(); };
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// Description:
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// Deletes the transformation on the top of the stack and sets the top
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// to the next transformation on the stack.
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void Pop() { if (this->Stack == NULL) { return; }
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this->Stack->Pop(&this->Concatenation);
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this->Modified(); };
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// Description:
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// Check for self-reference. Will return true if concatenating
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// with the specified transform, setting it to be our inverse,
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// or setting it to be our input will create a circular reference.
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// CircuitCheck is automatically called by SetInput(), SetInverse(),
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// and Concatenate(vtkXTransform *). Avoid using this function,
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// it is experimental.
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int CircuitCheck(vtkAbstractTransform *transform);
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// Return an inverse transform which will always update itself
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// to match this transform.
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vtkAbstractTransform *GetInverse() {
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return vtkLinearTransform::GetInverse(); }
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// Description:
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// Make a new transform of the same type.
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vtkAbstractTransform *MakeTransform();
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// Description:
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// Override GetMTime to account for input and concatenation.
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unsigned long GetMTime();
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// Description:
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// Use this method only if you wish to compute the transformation in
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// homogeneous (x,y,z,w) coordinates, otherwise use TransformPoint().
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// This method calls this->GetMatrix()->MultiplyPoint().
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void MultiplyPoint(const float in[4], float out[4]) {
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this->GetMatrix()->MultiplyPoint(in,out);};
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void MultiplyPoint(const double in[4], double out[4]) {
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this->GetMatrix()->MultiplyPoint(in,out);};
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protected:
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vtkTransform ();
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~vtkTransform ();
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void InternalDeepCopy(vtkAbstractTransform *t);
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void InternalUpdate();
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vtkLinearTransform *Input;
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vtkTransformConcatenation *Concatenation;
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vtkTransformConcatenationStack *Stack;
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// this allows us to check whether people have been fooling
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// around with our matrix
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unsigned long MatrixUpdateMTime;
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float Point[4];
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double DoublePoint[4];
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double ReturnValue[4];
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private:
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vtkTransform (const vtkTransform&); // Not implemented
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void operator=(const vtkTransform&); // Not implemented
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};
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#endif
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