atan2()

Calculates the angle (in radians) from a specified point to the coordinate origin as measured from the positive x-axis.

Examples

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def draw():
    py5.background(204)
    py5.translate(py5.width/2, py5.height/2)
    a = py5.atan2(py5.mouse_y - py5.height/2, py5.mouse_x - py5.width/2)
    py5.rotate(a)
    py5.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.

This function makes a call to the numpy atan2() function.

Syntax

atan2(y: float, x: float) -> float

Parameters

  • x: float - x-coordinate of the point

  • y: float - y-coordinate of the point

Updated on September 11, 2021 16:51:34pm UTC