Programming-Idioms

Idiom

# 365 Convert an angle to a direction

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Convert a degree, x, of 360, to a Compass direction, y.

For example, 123.4 deg is "South-east".

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Other implementations

enum Point {
    N, NE, E, SE, S, SW, W, NW;
    static Point parse(double x) {
        int i = (int) ((x / 45) + .5);
        return values()[i % 8];
    }
}
String y = Point.parse(x).name();

type
  TDir = (N, NE, E, SE, S, SW, W, NW);
const
  Dirs: array[TDir] of string = ('North','North East','East','South East','South','South West','West','North West');

var
  y: double;
  x: string;
begin
  ...
  y := Dirs[TDir(Round(((x-22.5)/45) + 0.5) mod 8)]);
end.

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