Name

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      ROTATE_XY

Purpose

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      Rotate a set of X,Y points about a given point.

Category

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Calling Sequence

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      rotate_xy, x1, y1, ang, x0, y0, x2, y2

Inputs

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      x1, y1 = original points to rotate. in
          Arrays or scalars.
      ang = angle to rotate by in radians (CCW). in
      x0, y0 = center to rotate about. in

Keyword Parameters

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Keywords

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        /DEGREES means angle is in degrees, else radians.

Outputs

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      x2, y2 = rotated points. out

Common Blocks

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Notes

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Modification History

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      R. Sterner. 22 Oct, 1986.
      R. Sterner, 22 Jan, 1990 --- converted to SUN.
      RES 13 Feb, 1991 --- added /degrees.
      Johns Hopkins University Applied Physics Laboratory.
  Copyright (C) 1986, Johns Hopkins University/Applied Physics Laboratory
  This software may be used, copied, or redistributed as long as it is not
  sold and this copyright notice is reproduced on each copy made. This
  routine is provided as is without any express or implied warranties
  whatsoever. Other limitations apply as described in the file disclaimer.txt.