Package org.eclipse.gef.geometry.internal.utils

Class PrecisionUtils

java.lang.Object
org.eclipse.gef.geometry.internal.utils.PrecisionUtils
public class PrecisionUtils extends Object
A utility class for floating point calculations and comparisons that should guarantee a precision of a given scale, and ignore differences beyond this scale.

  • Method Summary

    Modifier and Type
    Method
    Description
    static final double
    calculateFraction(int shift)
    Computes the smallest double that is yet recognizable (by comparison) when shifting the default scale up by the given amount.
    static final boolean
    equal(double d1, double d2)
     
    static final boolean
    equal(double d1, double d2, int shift)
    Tests whether the two values are regarded to be equal w.r.t. the given shift.
    static final boolean
    greater(double d1, double d2)
     
    static final boolean
    greater(double d1, double d2, int shift)
    Tests whether the first given value is regarded to be greater than the second value w.r.t. the given shift.
    static final boolean
    greaterEqual(double d1, double d2)
     
    static final boolean
    greaterEqual(double d1, double d2, int shift)
    Tests whether the first given value is regarded to be greater or equal than the second value w.r.t. the given shift.
    static final boolean
    smaller(double d1, double d2)
     
    static final boolean
    smaller(double d1, double d2, int shift)
    Tests whether the first given value is regarded to be smaller than the second value w.r.t. the given shift.
    static final boolean
    smallerEqual(double d1, double d2)
     
    static final boolean
    smallerEqual(double d1, double d2, int shift)
    Tests whether the first given value is regarded to be smaller or equal than the second value w.r.t. the given shift.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Method Details

    • calculateFraction

      public static final double calculateFraction(int shift)
      Computes the smallest double that is yet recognizable (by comparison) when shifting the default scale up by the given amount.
      Parameters:
      shift - the number of digits to shift precision up (may be negative number)
      Returns:
      the smallest double that will yet be recognizable by the methods of this class during comparison, when using the default scale shifted by the given amount.

    • equal

      public static final boolean equal(double d1, double d2)
      Parameters:
      d1 - The first operand.
      d2 - The second operand.
      Returns:
      result of the comparison
      See Also:

    • equal

      public static final boolean equal(double d1, double d2, int shift)
      Tests whether the two values are regarded to be equal w.r.t. the given shift.
      Parameters:
      d1 - the first value to test
      d2 - the second value to test
      shift - the delta shift used for this test
      Returns:
      true in case the given two values are identical or differ from each other by an amount that is smaller than what is recognizable by the shifted delta, false otherwise

    • greater

      public static final boolean greater(double d1, double d2)
      Parameters:
      d1 - The first operand.
      d2 - The second operand.
      Returns:
      result of the comparison
      See Also:

    • greater

      public static final boolean greater(double d1, double d2, int shift)
      Tests whether the first given value is regarded to be greater than the second value w.r.t. the given shift.
      Parameters:
      d1 - the first value to test
      d2 - the second value to test
      shift - the delta shift used for this test
      Returns:
      true in case the first value is greater than the second value by an amount recognizable by the shifted delta, false otherwise

    • greaterEqual

      public static final boolean greaterEqual(double d1, double d2)
      Parameters:
      d1 - The first operand.
      d2 - The second operand.
      Returns:
      result of the comparison
      See Also:

    • greaterEqual

      public static final boolean greaterEqual(double d1, double d2, int shift)
      Tests whether the first given value is regarded to be greater or equal than the second value w.r.t. the given shift.
      Parameters:
      d1 - the first value to test
      d2 - the second value to test
      shift - the delta shift used for this test
      Returns:
      true in case the first value is greater than the second value by an amount recognizable by the given scale or differs from it by an amount not recognizable by the shifted delta, false otherwise

    • smaller

      public static final boolean smaller(double d1, double d2)
      Parameters:
      d1 - The first operand.
      d2 - The second operand.
      Returns:
      result of the comparison
      See Also:

    • smaller

      public static final boolean smaller(double d1, double d2, int shift)
      Tests whether the first given value is regarded to be smaller than the second value w.r.t. the given shift.
      Parameters:
      d1 - the first value to test
      d2 - the second value to test
      shift - the delta shift used for this test
      Returns:
      true in case the first value is smaller than the second value by an amount recognizable by the shifted delta, false otherwise

    • smallerEqual

      public static final boolean smallerEqual(double d1, double d2)
      Parameters:
      d1 - The first operand.
      d2 - The second operand.
      Returns:
      result of the comparison
      See Also:

    • smallerEqual

      public static final boolean smallerEqual(double d1, double d2, int shift)
      Tests whether the first given value is regarded to be smaller or equal than the second value w.r.t. the given shift.
      Parameters:
      d1 - the first value to test
      d2 - the second value to test
      shift - the delta shift used for this test
      Returns:
      true in case the first value is smaller than the second value by an amount recognizable by the given scale or differs from it by an amount not recognizable by the shifted delta, false otherwise