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 point
  • x(float)x-coordinate of the point

Return

  • float

Related