Figure 30–24. What the Return Value from $atan2 Represents
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Figure 30–23. $atan2 (GENERIC)
| REAL PROCEDURE $atan2 (REAL y,x); LONG REAL PROCEDURE $atan2 (LONG REAL y,x); |
$atan2 returns the angle, in radians, with respect to the positive x-axis of a ray from the origin to a point with coordinates (x,y). Angles increase counterclockwise. The value returned is between minus pi and pi. If x and y are both positive, then $atan2(y,x) returns the same value as atan(y / x) (except that $atan2 may be more accurate for some values).
The effect is undefined if both x and y are zero, since such values do not define a ray with respect to the origin.
Figure 30–24. What the Return Value from $atan2 Represents
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MAINSAIL Language Manual, Section 30.24