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  1. JDK
  2. JDK-6341878

add degree-based trigonometric methods to the Math class

    Details

    • Type: Enhancement
    • Status: Closed
    • Priority: P4
    • Resolution: Won't Fix
    • Affects Version/s: 1.1
    • Fix Version/s: None
    • Component/s: core-libs
    • Labels:
    • Subcomponent:
    • CPU:
      generic
    • OS:
      generic

      Description

      The trigonometric methods on the java.lang.Math class which take
      an angle measured in radians are fairly standard for a math
      package.

      Unfortunately, some common angles, such as multiples of 90 degrees
      other than 0.0, cannot be represented exactly in radians. Also,
      entering constant values for such angles in source code is not
      straight-forward since the developer must enter something like
      "Math.PI / 2.0" for 90 degrees, which is not as straight-forward
      or easy to remember for casual developers than the equivalent
      angle notated in degrees. Additionally, the inability to represent
      multiples of 90 degrees in radian form means that methods such as
      sin() and cos() can never return exactly 0.0 for angles other than
      0.0 since they can never be given an angle which exactly warrants
      such an answer.

      Since multiples of 90 degrees (and other simple angles such as 30,
      45, and 60 degrees) are fairly common in many mid-level graphics
      programs, it would be nice if we could make such programming both
      easier and more accurate by providing trigonometric functions which
      operate on angle arguments measured in degrees.

      A suggestion would be to add the following methods:

      Math.sinDegrees(double degrees);
      Math.cosDegrees(double degrees);
      Math.tanDegrees(double degrees);
      Math.asinDegrees(double v); // return value in degrees
      Math.acosDegrees(double v); // return value in degrees
      Math.atanDegrees(double v); // return value in degrees
      Math.atan2Degrees(double v); // return value in degrees

      Note that the name "atan2Degrees" could be confusing, somehow
      implying that the function converts "something" to degrees
      which is a common usage for the numeral 2 embedded in the
      middle of a function name. I don't think we use that convention
      in Java code anywhere, but I've seen it in other code bases.
      On the other hand, other than a semantic jarring if one reads
      the name of the method out loud, the meaning of such a method
      should be readily obvious to those familiar with standard
      trigonometric packages.

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              • Assignee:
                darcy Joe Darcy
                Reporter:
                flar Jim Graham
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