Name

Atan2 Function — System.Math

Synopsis

Math.Atan2(y, x)
x required; Double

The x coordinate of a point

y required; Double

The y coordinate of a point

Return Value

A Double that is the arctangent of the ratio x/y, in radians

Description

Returns the angle in the Cartesian plane formed by the x-axis and a vector starting from the origin (0,0) and terminating at the point (x, y). More specifically, the return value q satisfies the following:

  • For (x, y) in quadrant 1, 0 < q < pi/2

  • For (x, y) in quadrant 2, pi /2 < q < pi

  • For (x, y) in quadrant 3, -pi < q < -pi /2

  • For (x, y) in quadrant 4, -pi /2 < q < 0

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