Class EuclideanVector<V extends EuclideanVector<V>>

java.lang.Object
org.apache.commons.geometry.euclidean.EuclideanVector<V>
Type Parameters:
V - Vector implementation type
All Implemented Interfaces:
Point<V>, Spatial, Vector<V>
Direct Known Subclasses:
MultiDimensionalEuclideanVector, Vector1D
public abstract class EuclideanVector<V extends EuclideanVector<V>> extends Object implements Vector<V>, Point<V>
Abstract base class for Euclidean vectors and points. See here for a discussion of the combination of point and vector functionality into a single class hierarchy.

  • Constructor Details

    • EuclideanVector

      public EuclideanVector()

  • Method Details

    • vectorTo

      public abstract V vectorTo(V v)
      Return the vector representing the displacement from this vector to the given vector. This is exactly equivalent to v.subtract(thisVector) but with a method name that is much easier to visualize.
      Parameters:
      v - the vector that the returned vector will be directed toward
      Returns:
      vector representing the displacement from this vector to the given vector

    • directionTo

      public abstract V directionTo(V v)
      Return the unit vector representing the direction of displacement from this vector to the given vector. This is exactly equivalent to v.subtract(thisVector).normalize() but without the intermediate vector instance.
      Parameters:
      v - the vector that the returned vector will be directed toward
      Returns:
      unit vector representing the direction of displacement from this vector to the given vector
      Throws:
      IllegalArgumentException - if the norm of the vector pointing from this instance to v is zero, NaN, or infinite

    • lerp

      public abstract V lerp(V v, double t)
      Get a vector constructed by linearly interpolating between this vector and the given vector. The vector coordinates are generated by the equation V = (1 - t)*A + t*B, where A is the current vector and B is the given vector. This means that if t = 0, a vector equal to the current vector will be returned. If t = 1, a vector equal to the argument will be returned. The t parameter is not constrained to the range [0, 1], meaning that linear extrapolation can also be performed with this method.
      Parameters:
      v - other vector
      t - interpolation parameter
      Returns:
      interpolated or extrapolated vector

    • eq

      public abstract boolean eq(V v, org.apache.commons.numbers.core.Precision.DoubleEquivalence precision)
      Return true if the current instance and given vector are considered equal as evaluated by the given precision context.

      Equality is determined by comparing each pair of components in turn from the two vectors. If all components evaluate as equal, then the vectors are considered equal. If any are not equal, then the vectors are not considered equal. Note that this approach means that the calculated distance between two "equal" vectors may be as much as √(n * eps2), where n is the number of components in the vector and eps is the maximum epsilon value allowed by the precision context.

      Parameters:
      v - vector to check for equality
      precision - precision context used to determine floating point equality
      Returns:
      true if the current instance is considered equal to the given vector when using the given precision context; otherwise false

    • isZero

      public boolean isZero(org.apache.commons.numbers.core.Precision.DoubleEquivalence precision)
      Return true if the current instance is considered equal to the zero vector as evaluated by the given precision context. This is a convenience method equivalent to vec.equals(vec.getZero(), precision).
      Parameters:
      precision - precision context used to determine floating point equality
      Returns:
      true if the current instance is considered equal to the zero vector when using the given precision context; otherwise false
      See Also:

    • getCheckedNorm

      protected double getCheckedNorm()
      Return the vector norm value, throwing an IllegalArgumentException if the value is not real (ie, NaN or infinite) or zero.
      Returns:
      the vector norm value, guaranteed to be real and non-zero
      Throws:
      IllegalArgumentException - if the vector norm is zero, NaN, or infinite