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Associated article: Rotating a Weather Map

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Published source code accompanying the article by Robert D. Grappel in which he describes and implements an algorithm he developed to efficiently perform rotation of graphical weather maps used by airplane pilots. He then suggests techniques you can use to optimize other time-limited computer applications.

					Rotating a Weather Map
by Robert D. Grappel

Figure 3:

(a)
N2 = (N/2) + 1          center point of a map edge
NN = 0.5 - N2           adjust to center of a given pixel
FOR I = 1 TO N
t = I + NN              center-point pixel coordinate
    CC[I] = ...
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