Class Vec3

java.lang.Object
healpix.essentials.Vec3
public class Vec3 extends 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 Details

    • x

      public double x

    • y

      public double y

    • z

      public double z

  • Constructor Details

    • 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(Pointing ptg)
      Conversion from Pointing

    • Vec3

      public Vec3(Zphi zphi)
      Conversion from Zphi

    • Vec3

      public Vec3(double[] arr)

  • Method Details

    • 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 String toString()
      Overrides:
      toString in class Object

    • toArray

      public double[] toArray()

    • toArray

      public void toArray(double[] arr)

    • equals

      public boolean equals(Object o)
      Overrides:
      equals in class Object

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object