Name
atan2()
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 due the structure of calculating the tangent.
Examples
void draw() { background(204); translate(width/2, height/2); float a = atan2(mouseY-height/2, mouseX-width/2); rotate(a); rect(-30, -5, 60, 10); }
Syntax
atan2(y, x)
Parameters
y(float)y-coordinate of the pointx(float)x-coordinate of the point
Return
float
Related
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