Method atan2

core/src/processing/core/PApplet.java:4439–4441

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

(float y, float x)

   * @see PApplet#tan(float)
   */
  static public final float atan2(float y, float x) {
    return (float)Math.atan2(y, x);
  }

/**
   *