atan2 \ Language (API)

Name

atan2

Examples

draw <- function() {
    background(204)
    translate(width/2, height/2)
    a = atan2(mouseY - height/2, mouseX - width/2)
    rotate(a)
    rect(-30, -5, 60, 10)
}

Description

Calculates the angle (in radians) from a specified point to the coordinate origin as measured from the positive x-axis. Values are returned as a float in the range from PI to -PI. The atan2() function is most often used for orienting geometry to the position of the cursor. Note: The y-coordinate of the point is the first parameter, and the x-coordinate is the second parameter, due the the structure of calculating the tangent.

Syntax

atan2(y, x)

Parameters

y	float: y-coordinate of the point
x	float: x-coordinate of the point

tan