RDKit
Open-source cheminformatics and machine learning.
Transform2D.h
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1 //
2 // Copyright (C) 2003-2006 Rational Discovery LLC
3 //
4 // @@ All Rights Reserved @@
5 // This file is part of the RDKit.
6 // The contents are covered by the terms of the BSD license
7 // which is included in the file license.txt, found at the root
8 // of the RDKit source tree.
9 //
10 #ifndef __RD_TRANSFORM2D_H__
11 #define __RD_TRANSFORM2D_H__
12 
13 #include "Transform.h"
14 #include <Numerics/SquareMatrix.h>
15 
16 namespace RDGeom {
17 class Point2D;
18 const unsigned int DIM_2D = 3;
19 
20 class Transform2D : public RDNumeric::SquareMatrix<double> {
21  public:
22  //! \brief Constructor
23  /*!
24  Initialize to an identity matrix transformation
25  This is a 3x3 matrix that includes the rotation and translation parts
26  see Foley's "Introduction to Computer Graphics" for the representation
27 
28  Operator *= and = are provided by the parent class square matrix.
29  Operator *= needs some explanation, since the order matters. This transform
30  gets set to
31  the combination other and the current state of this transform
32  If this_old and this_new are the states of this object before and after this
33  function
34  we have
35  this_new(point) = this_old(other(point))
36  */
37  Transform2D() : RDNumeric::SquareMatrix<double>(DIM_2D, 0.0) {
38  unsigned int i, id;
39  for (i = 0; i < DIM_2D; i++) {
40  id = i * (DIM_2D + 1);
41  d_data[id] = 1.0;
42  }
43  }
44 
45  void setToIdentity();
46 
47  void TransformPoint(Point2D &pt) const;
48 
49  void SetTranslation(const Point2D &pt);
50 
51  /*! \brief Set the tranform so that the specified points are aligned
52  *
53  * The resulting tranformation will align pt1 with ref1, and rotation
54  * pt2 such that the line betweem (pt1, pt2) will align with
55  * with the line (ref1, ref2)
56  */
57  void SetTransform(const Point2D &ref1, const Point2D &ref2,
58  const Point2D &pt1, const Point2D &pt2);
59 
60  /*! \brief Set the trans form to counterclock wise rotation by the specified
61  *value around point
62  *
63  * ARGUMENTS:
64  * - pt : point about which to rotate
65  * - angle : the angle byt which to rotate
66  */
67  void SetTransform(const Point2D &pt, double angle);
68 
69  private:
70 };
71 }
72 
73 /*! \brief Combine two transforms and return the results as a new transform
74  *
75  * The order is important here, on two transforms t1 and t2
76  * t3 = t1*t2
77  * The resulting transform t3 has the folliwng effect
78  * t3(point) = t1(t2(point))
79  */
81  const RDGeom::Transform2D &t2);
82 
83 #endif
void SetTransform(const Point2D &ref1, const Point2D &ref2, const Point2D &pt1, const Point2D &pt2)
Set the tranform so that the specified points are aligned.
Transform2D()
Constructor.
Definition: Transform2D.h:37
SquareMatrix()
brief Square matrix of size N
Definition: SquareMatrix.h:20
RDGeom::Point3D operator*(const RDGeom::Point3D &p1, double v)
const unsigned int DIM_2D
Definition: Transform2D.h:18
void SetTranslation(const Point2D &pt)
void TransformPoint(Point2D &pt) const