Package healpix.essentials

Class Vec3

  • public class Vec3
extends java.lang.Object
    Cartesian 3-vector. Instead of using the javax.vecmath.Vector3d class, this separate class was implemented for two reasons: first, to avoid the external dependency from vecmath.jar, and also because the function Vector3d.angle(Vector3d v1) is too inaccurate for usage in Healpix for very small angles.

    • Field Summary

      Fields 
      Modifier and Type Field Description
      double x  
      double y  
      double z  

    • Constructor Summary

      Constructors 
      Constructor Description
      Vec3()
      Default constructor.
      Vec3​(double[] arr)  
      Vec3​(double x1, double y1, double z1)
      Creation from individual components
      Vec3​(Pointing ptg)
      Conversion from Pointing
      Vec3​(Vec3 v)  
      Vec3​(Zphi zphi)
      Conversion from Zphi

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Vec3 add​(Vec3 v)
      Vector addition
      double angle​(Vec3 v1)
      Angle between two vectors.
      Vec3 cross​(Vec3 v)
      Vector cross product.
      double dot​(Vec3 v1)
      Computes the dot product of the this vector and v1.
      boolean equals​(java.lang.Object o)  
      void flip()
      Invert the signs of all components
      Vec3 flipped()  
      int hashCode()  
      double length()
      Vector length
      double lengthSquared()
      Squared vector length
      Vec3 mul​(double n)
      Vector scaling.
      Vec3 norm()
      Return normalized vector
      void normalize()
      Normalize the vector
      void scale​(double n)
      Scale the vector by a given factor
      Vec3 sub​(Vec3 v)
      Vector subtraction
      double[] toArray()  
      void toArray​(double[] arr)  
      java.lang.String toString()  

      • Methods inherited from class java.lang.Object

        clone, finalize, getClass, notify, notifyAll, wait, wait, wait

    • Field Detail

      • x

        public double x

      • y

        public double y

      • z

        public double z

    • Constructor Detail

      • Vec3

        public Vec3()
        Default constructor.

      • Vec3

        public Vec3​(Vec3 v)

      • Vec3

        public Vec3​(double x1,
            double y1,
            double z1)
        Creation from individual components

      • Vec3

        public Vec3​(Zphi zphi)
        Conversion from Zphi

      • Vec3

        public Vec3​(double[] arr)

    • Method Detail

      • length

        public final double length()
        Vector length
        Returns:
        the length of the vector.

      • lengthSquared

        public final double lengthSquared()
        Squared vector length
        Returns:
        the squared length of the vector.

      • normalize

        public void normalize()
        Normalize the vector

      • norm

        public Vec3 norm()
        Return normalized vector

      • angle

        public final double angle​(Vec3 v1)
        Angle between two vectors.
        Parameters:
        v1 - another vector
        Returns:
        the angle in radians between this vector and v1; constrained to the range [0,PI].

      • cross

        public Vec3 cross​(Vec3 v)
        Vector cross product.
        Parameters:
        v - another vector
        Returns:
        the vector cross product between this vector and v

      • mul

        public Vec3 mul​(double n)
        Vector scaling.
        Parameters:
        n - the scale number to be multiply to the coordinates x,y,z
        Returns:
        the vector with coordinates multiplied by n

      • flip

        public void flip()
        Invert the signs of all components

      • flipped

        public Vec3 flipped()

      • scale

        public void scale​(double n)
        Scale the vector by a given factor
        Parameters:
        n - the scale factor

      • dot

        public final double dot​(Vec3 v1)
        Computes the dot product of the this vector and v1.
        Parameters:
        v1 - another vector
        Returns:
        dot product

      • add

        public Vec3 add​(Vec3 v)
        Vector addition
        Parameters:
        v - the vector to be added
        Returns:
        addition result

      • sub

        public Vec3 sub​(Vec3 v)
        Vector subtraction
        Parameters:
        v - the vector to be subtracted
        Returns:
        subtraction result

      • toString

        public java.lang.String toString()
        Overrides:
        toString in class java.lang.Object

      • toArray

        public double[] toArray()

      • toArray

        public void toArray​(double[] arr)

      • equals

        public boolean equals​(java.lang.Object o)
        Overrides:
        equals in class java.lang.Object

      • hashCode

        public int hashCode()
        Overrides:
        hashCode in class java.lang.Object