Package org.biojava.nbio.structure
Class Calc
- java.lang.Object
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- org.biojava.nbio.structure.Calc
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public class Calc extends java.lang.Object
Utility operations on Atoms, AminoAcids, etc.Currently the coordinates of an Atom are stored as an array of size 3 (double[3]). It would be more powerful to use Point3D from javax.vecmath, but unfortunately this is not a part of standard java installations, since it comes with java3d. So to keep things simple at the moment biojava does not depend on java3d.
- Since:
- 1.4
- Version:
- %I% %G%
- Author:
- Andreas Prlic
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Constructor Summary
Constructors Constructor Description Calc()
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Method Summary
All Methods Static Methods Concrete Methods Modifier and Type Method Description static Atom
add(Atom a, Atom b)
add two atoms ( a + b).static double
amount(Atom a)
Gets the length of the vector (2-norm)static double
angle(Atom a, Atom b)
Gets the angle between two vectorsstatic javax.vecmath.Point3d[]
atomsToPoints(Atom[] atoms)
Convert an array of atoms into an array of vecmath pointsstatic double
calcRotationAngleInDegrees(Atom centerPt, Atom targetPt)
Calculates the angle from centerPt to targetPt in degrees.static Atom[]
centerAtoms(Atom[] atomSet)
Center the atoms at the Centroid.static Atom[]
centerAtoms(Atom[] atomSet, Atom centroid)
Center the atoms at the Centroid, if the centroid is already know.static Atom
centerOfMass(Atom[] points)
static Atom
createVirtualCBAtom(AminoAcid amino)
creates a virtual C-beta atom.static Atom
getCenterVector(Atom[] atomSet)
Returns the Vector that needs to be applied to shift a set of atoms to the Centroid.static Atom
getCenterVector(Atom[] atomSet, Atom centroid)
Returns the Vector that needs to be applied to shift a set of atoms to the Centroid, if the centroid is already knownstatic Atom
getCentroid(Atom[] atomSet)
Returns the center of mass of the set of atoms.static double
getDistance(Atom a, Atom b)
calculate distance between two atoms.static double
getDistanceFast(Atom a, Atom b)
Will calculate the square of distances between two atoms.static double
getPhi(AminoAcid a, AminoAcid b)
Calculate the phi angle.static double
getPsi(AminoAcid a, AminoAcid b)
Calculate the psi angle.static Matrix
getRotationMatrix(javax.vecmath.Matrix4d transform)
Convert Vecmath transformation into a JAMA rotation matrix.static javax.vecmath.Matrix4d
getTransformation(Matrix rot, Atom trans)
Convert JAMA rotation and translation to a Vecmath transformation matrix.static javax.vecmath.Matrix4d
getTransformation(Matrix rot, Matrix trans)
Convert JAMA rotation and translation to a Vecmath transformation matrix.static Atom
getTranslationVector(javax.vecmath.Matrix4d transform)
Extract the translational vector of a Vecmath transformation.static double[]
getXYZEuler(Matrix m)
Convert a rotation Matrix to Euler angles.static double[]
getZYZEuler(Matrix m)
Gets euler angles for a matrix given in ZYZ convention.static Atom
invert(Atom a)
static boolean
isConnected(AminoAcid a, AminoAcid b)
Test if two amino acids are connected, i.e.static void
main(java.lang.String[] args)
static Matrix
matrixFromEuler(double heading, double attitude, double bank)
This conversion uses NASA standard aeroplane conventions as described on page: http://www.euclideanspace.com/maths/geometry/rotations/euler/index.htm Coordinate System: right hand Positive angle: right hand Order of euler angles: heading first, then attitude, then bank.static void
plus(Structure s, Matrix matrix)
calculate structure + Matrix coodinates ...static void
rotate(Atom[] ca, Matrix matrix)
static void
rotate(Atom atom, double[][] m)
Rotate a single Atom aroud a rotation matrix.static void
rotate(Atom atom, Matrix m)
Rotate an Atom around a Matrix object.static void
rotate(Group group, double[][] rotationmatrix)
Rotate a Group.static void
rotate(Group group, Matrix m)
Rotate a group object.static void
rotate(Structure structure, double[][] rotationmatrix)
Rotate a structure.static void
rotate(Structure structure, Matrix m)
Rotate a structure object.static double
scalarProduct(Atom a, Atom b)
Scalar product (dot product).static Atom
scale(Atom a, double s)
Multiply elements of a by sstatic Atom
scaleAdd(double s, Atom x, Atom b)
Perform linear transformation s*X+B, and store the result in bstatic Atom
scaleEquals(Atom a, double s)
Multiply elements of a by s (in place)static void
shift(Atom[] ca, Atom b)
Shift an array of atoms at once.static void
shift(Atom a, Atom b)
Shift a vector.static void
shift(Group group, Atom a)
Shift a Group with a vector.static void
shift(Structure structure, Atom a)
shift a structure with a vector.static Atom
subtract(Atom a, Atom b)
subtract two atoms ( a - b).static double
torsionAngle(Atom a, Atom b, Atom c, Atom d)
Calculate the torsion angle, i.e.static void
transform(Atom[] ca, javax.vecmath.Matrix4d t)
Transform an array of atoms at once.static void
transform(Atom atom, javax.vecmath.Matrix4d m)
Transforms an atom object, given a Matrix4d (i.e.static void
transform(Chain chain, javax.vecmath.Matrix4d m)
Transforms a chain object, given a Matrix4d (i.e.static void
transform(Group group, javax.vecmath.Matrix4d m)
Transforms a group object, given a Matrix4d (i.e.static void
transform(Structure structure, javax.vecmath.Matrix4d m)
Transforms a structure object, given a Matrix4d (i.e.static void
translate(Atom atom, javax.vecmath.Vector3d v)
Translates an atom object, given a Vector3d (i.e.static void
translate(Chain chain, javax.vecmath.Vector3d v)
Translates a chain object, given a Vector3d (i.e.static void
translate(Group group, javax.vecmath.Vector3d v)
Translates a group object, given a Vector3d (i.e.static void
translate(Structure structure, javax.vecmath.Vector3d v)
Translates a Structure object, given a Vector3d (i.e.static Atom
unitVector(Atom a)
Returns the unit vector of vector a .static Atom
vectorProduct(Atom a, Atom b)
Vector product (cross product).
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Method Detail
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getDistance
public static final double getDistance(Atom a, Atom b)
calculate distance between two atoms.- Parameters:
a
- an Atom objectb
- an Atom object- Returns:
- a double
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getDistanceFast
public static double getDistanceFast(Atom a, Atom b)
Will calculate the square of distances between two atoms. This will be faster as it will not perform the final square root to get the actual distance. Use this if doing large numbers of distance comparisons - it is marginally faster than getDistance().- Parameters:
a
- an Atom objectb
- an Atom object- Returns:
- a double
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add
public static final Atom add(Atom a, Atom b)
add two atoms ( a + b).- Parameters:
a
- an Atom objectb
- an Atom object- Returns:
- an Atom object
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subtract
public static final Atom subtract(Atom a, Atom b)
subtract two atoms ( a - b).- Parameters:
a
- an Atom objectb
- an Atom object- Returns:
- n new Atom object representing the difference
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vectorProduct
public static final Atom vectorProduct(Atom a, Atom b)
Vector product (cross product).- Parameters:
a
- an Atom objectb
- an Atom object- Returns:
- an Atom object
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scalarProduct
public static final double scalarProduct(Atom a, Atom b)
Scalar product (dot product).- Parameters:
a
- an Atom objectb
- an Atom object- Returns:
- a double
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amount
public static final double amount(Atom a)
Gets the length of the vector (2-norm)- Parameters:
a
- an Atom object- Returns:
- Square root of the sum of the squared elements
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angle
public static final double angle(Atom a, Atom b)
Gets the angle between two vectors- Parameters:
a
- an Atom objectb
- an Atom object- Returns:
- Angle between a and b in degrees, in range [0,180]. If either vector has length 0 then angle is not defined and NaN is returned
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unitVector
public static final Atom unitVector(Atom a)
Returns the unit vector of vector a .- Parameters:
a
- an Atom object- Returns:
- an Atom object
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torsionAngle
public static final double torsionAngle(Atom a, Atom b, Atom c, Atom d)
Calculate the torsion angle, i.e. the angle between the normal vectors of the two plains a-b-c and b-c-d. See http://en.wikipedia.org/wiki/Dihedral_angle- Parameters:
a
- an Atom objectb
- an Atom objectc
- an Atom objectd
- an Atom object- Returns:
- the torsion angle in degrees, in range +-[0,180]. If either first 3 or last 3 atoms are colinear then torsion angle is not defined and NaN is returned
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getPhi
public static final double getPhi(AminoAcid a, AminoAcid b) throws StructureException
Calculate the phi angle.- Parameters:
a
- an AminoAcid objectb
- an AminoAcid object- Returns:
- a double
- Throws:
StructureException
- if aminoacids not connected or if any of the 4 needed atoms missing
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getPsi
public static final double getPsi(AminoAcid a, AminoAcid b) throws StructureException
Calculate the psi angle.- Parameters:
a
- an AminoAcid objectb
- an AminoAcid object- Returns:
- a double
- Throws:
StructureException
- if aminoacids not connected or if any of the 4 needed atoms missing
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isConnected
public static final boolean isConnected(AminoAcid a, AminoAcid b)
Test if two amino acids are connected, i.e. if the distance from C to N < 2.5 Angstrom. If one of the AminoAcids has an atom missing, returns false.- Parameters:
a
- an AminoAcid objectb
- an AminoAcid object- Returns:
- true if ...
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rotate
public static final void rotate(Atom atom, double[][] m)
Rotate a single Atom aroud a rotation matrix. The rotation Matrix must be a pre-multiplication 3x3 Matrix. If the matrix is indexed m[row][col], then the matrix will be pre-multiplied (y=atom*M)- Parameters:
atom
- atom to be rotatedm
- a rotation matrix represented as a double[3][3] array
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rotate
public static final void rotate(Structure structure, double[][] rotationmatrix) throws StructureException
Rotate a structure. The rotation Matrix must be a pre-multiplication Matrix.- Parameters:
structure
- a Structure objectrotationmatrix
- an array (3x3) of double representing the rotation matrix.- Throws:
StructureException
- ...
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rotate
public static final void rotate(Group group, double[][] rotationmatrix) throws StructureException
Rotate a Group. The rotation Matrix must be a pre-multiplication Matrix.- Parameters:
group
- a group objectrotationmatrix
- an array (3x3) of double representing the rotation matrix.- Throws:
StructureException
- ...
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rotate
public static final void rotate(Atom atom, Matrix m)
Rotate an Atom around a Matrix object. The rotation Matrix must be a pre-multiplication Matrix.- Parameters:
atom
- atom to be rotatedm
- rotation matrix to be applied to the atom
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rotate
public static final void rotate(Group group, Matrix m)
Rotate a group object. The rotation Matrix must be a pre-multiplication Matrix.- Parameters:
group
- a group to be rotatedm
- a Matrix object representing the rotation matrix
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rotate
public static final void rotate(Structure structure, Matrix m)
Rotate a structure object. The rotation Matrix must be a pre-multiplication Matrix.- Parameters:
structure
- the structure to be rotatedm
- rotation matrix to be applied
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transform
public static void transform(Atom[] ca, javax.vecmath.Matrix4d t)
Transform an array of atoms at once. The transformation Matrix must be a post-multiplication Matrix.- Parameters:
ca
- array of Atoms to shiftt
- transformation Matrix4d
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transform
public static final void transform(Atom atom, javax.vecmath.Matrix4d m)
Transforms an atom object, given a Matrix4d (i.e. the vecmath library double-precision 4x4 rotation+translation matrix). The transformation Matrix must be a post-multiplication Matrix.- Parameters:
atom
-m
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transform
public static final void transform(Group group, javax.vecmath.Matrix4d m)
Transforms a group object, given a Matrix4d (i.e. the vecmath library double-precision 4x4 rotation+translation matrix). The transformation Matrix must be a post-multiplication Matrix.- Parameters:
group
-m
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transform
public static final void transform(Structure structure, javax.vecmath.Matrix4d m)
Transforms a structure object, given a Matrix4d (i.e. the vecmath library double-precision 4x4 rotation+translation matrix). The transformation Matrix must be a post-multiplication Matrix.- Parameters:
structure
-m
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transform
public static final void transform(Chain chain, javax.vecmath.Matrix4d m)
Transforms a chain object, given a Matrix4d (i.e. the vecmath library double-precision 4x4 rotation+translation matrix). The transformation Matrix must be a post-multiplication Matrix.- Parameters:
chain
-m
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translate
public static final void translate(Atom atom, javax.vecmath.Vector3d v)
Translates an atom object, given a Vector3d (i.e. the vecmath library double-precision 3-d vector)- Parameters:
atom
-v
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translate
public static final void translate(Group group, javax.vecmath.Vector3d v)
Translates a group object, given a Vector3d (i.e. the vecmath library double-precision 3-d vector)- Parameters:
group
-v
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translate
public static final void translate(Chain chain, javax.vecmath.Vector3d v)
Translates a chain object, given a Vector3d (i.e. the vecmath library double-precision 3-d vector)- Parameters:
chain
-v
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translate
public static final void translate(Structure structure, javax.vecmath.Vector3d v)
Translates a Structure object, given a Vector3d (i.e. the vecmath library double-precision 3-d vector)- Parameters:
structure
-v
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plus
public static final void plus(Structure s, Matrix matrix)
calculate structure + Matrix coodinates ...- Parameters:
s
- the structure to operate onmatrix
- a Matrix object
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shift
public static final void shift(Structure structure, Atom a)
shift a structure with a vector.- Parameters:
structure
- a Structure objecta
- an Atom object representing a shift vector
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shift
public static final void shift(Atom a, Atom b)
Shift a vector.- Parameters:
a
- vector ab
- vector b
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shift
public static final void shift(Group group, Atom a)
Shift a Group with a vector.- Parameters:
group
- a group objecta
- an Atom object representing a shift vector
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getCentroid
public static final Atom getCentroid(Atom[] atomSet)
Returns the center of mass of the set of atoms.- Parameters:
atomSet
- a set of Atoms- Returns:
- an Atom representing the Centroid of the set of atoms
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scaleEquals
public static Atom scaleEquals(Atom a, double s)
Multiply elements of a by s (in place)- Parameters:
a
-s
-- Returns:
- the modified a
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scale
public static Atom scale(Atom a, double s)
Multiply elements of a by s- Parameters:
a
-s
-- Returns:
- A new Atom with s*a
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scaleAdd
public static Atom scaleAdd(double s, Atom x, Atom b)
Perform linear transformation s*X+B, and store the result in b- Parameters:
s
- Amount to scale xx
- Input coordinateb
- Vector to translate (will be modified)- Returns:
- b, after modification
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getCenterVector
public static final Atom getCenterVector(Atom[] atomSet)
Returns the Vector that needs to be applied to shift a set of atoms to the Centroid.- Parameters:
atomSet
- array of Atoms- Returns:
- the vector needed to shift the set of atoms to its geometric center
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getCenterVector
public static final Atom getCenterVector(Atom[] atomSet, Atom centroid)
Returns the Vector that needs to be applied to shift a set of atoms to the Centroid, if the centroid is already known- Parameters:
atomSet
- array of Atoms- Returns:
- the vector needed to shift the set of atoms to its geometric center
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centerAtoms
public static final Atom[] centerAtoms(Atom[] atomSet) throws StructureException
Center the atoms at the Centroid.- Parameters:
atomSet
- a set of Atoms- Returns:
- an Atom representing the Centroid of the set of atoms
- Throws:
StructureException
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centerAtoms
public static final Atom[] centerAtoms(Atom[] atomSet, Atom centroid) throws StructureException
Center the atoms at the Centroid, if the centroid is already know.- Parameters:
atomSet
- a set of Atoms- Returns:
- an Atom representing the Centroid of the set of atoms
- Throws:
StructureException
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createVirtualCBAtom
public static final Atom createVirtualCBAtom(AminoAcid amino) throws StructureException
creates a virtual C-beta atom. this might be needed when working with GLY thanks to Peter Lackner for a python template of this method.- Parameters:
amino
- the amino acid for which a "virtual" CB atom should be calculated- Returns:
- a "virtual" CB atom
- Throws:
StructureException
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getZYZEuler
public static final double[] getZYZEuler(Matrix m)
Gets euler angles for a matrix given in ZYZ convention. (as e.g. used by Jmol)- Parameters:
m
- the rotation matrix- Returns:
- the euler values for a rotation around Z, Y, Z in degrees...
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getXYZEuler
public static final double[] getXYZEuler(Matrix m)
Convert a rotation Matrix to Euler angles. This conversion uses conventions as described on page: http://www.euclideanspace.com/maths/geometry/rotations/euler/index.htm Coordinate System: right hand Positive angle: right hand Order of euler angles: heading first, then attitude, then bank- Parameters:
m
- the rotation matrix- Returns:
- a array of three doubles containing the three euler angles in radians
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matrixFromEuler
public static final Matrix matrixFromEuler(double heading, double attitude, double bank)
This conversion uses NASA standard aeroplane conventions as described on page: http://www.euclideanspace.com/maths/geometry/rotations/euler/index.htm Coordinate System: right hand Positive angle: right hand Order of euler angles: heading first, then attitude, then bank. matrix row column ordering: [m00 m01 m02] [m10 m11 m12] [m20 m21 m22]- Parameters:
heading
- in radiansattitude
- in radiansbank
- in radians- Returns:
- the rotation matrix
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calcRotationAngleInDegrees
public static double calcRotationAngleInDegrees(Atom centerPt, Atom targetPt)
Calculates the angle from centerPt to targetPt in degrees. The return should range from [0,360), rotating CLOCKWISE, 0 and 360 degrees represents NORTH, 90 degrees represents EAST, etc... Assumes all points are in the same coordinate space. If they are not, you will need to call SwingUtilities.convertPointToScreen or equivalent on all arguments before passing them to this function.- Parameters:
centerPt
- Point we are rotating around.targetPt
- Point we want to calculate the angle to.- Returns:
- angle in degrees. This is the angle from centerPt to targetPt.
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main
public static void main(java.lang.String[] args)
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shift
public static void shift(Atom[] ca, Atom b)
Shift an array of atoms at once.- Parameters:
ca
- array of Atoms to shiftb
- reference Atom vector
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getTransformation
public static javax.vecmath.Matrix4d getTransformation(Matrix rot, Matrix trans)
Convert JAMA rotation and translation to a Vecmath transformation matrix. Because the JAMA matrix is a pre-multiplication matrix and the Vecmath matrix is a post-multiplication one, the rotation matrix is transposed to ensure that the transformation they produce is the same.- Parameters:
rot
- 3x3 Rotation matrixtrans
- 3x1 Translation matrix- Returns:
- 4x4 transformation matrix
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getTransformation
public static javax.vecmath.Matrix4d getTransformation(Matrix rot, Atom trans)
Convert JAMA rotation and translation to a Vecmath transformation matrix. Because the JAMA matrix is a pre-multiplication matrix and the Vecmath matrix is a post-multiplication one, the rotation matrix is transposed to ensure that the transformation they produce is the same.- Parameters:
rot
- 3x3 Rotation matrixtrans
- 3x1 translation vector in Atom coordinates- Returns:
- 4x4 transformation matrix
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getRotationMatrix
public static Matrix getRotationMatrix(javax.vecmath.Matrix4d transform)
Convert Vecmath transformation into a JAMA rotation matrix. Because the JAMA matrix is a pre-multiplication matrix and the Vecmath matrix is a post-multiplication one, the rotation matrix is transposed to ensure that the transformation they produce is the same.- Parameters:
transform
- Matrix4d with transposed rotation matrix- Returns:
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getTranslationVector
public static Atom getTranslationVector(javax.vecmath.Matrix4d transform)
Extract the translational vector of a Vecmath transformation.- Parameters:
transform
- Matrix4d- Returns:
- Atom shift vector
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atomsToPoints
public static javax.vecmath.Point3d[] atomsToPoints(Atom[] atoms)
Convert an array of atoms into an array of vecmath points- Parameters:
atoms
- list of atoms- Returns:
- list of Point3ds storing the x,y,z coordinates of each atom
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