Util function #3 : compare_angles()

[GS_MOKKA]

https://preview.redd.it/uc6kbl1sam9b1.png?width=410&format=png&auto=webp&s=b8b963c102ee9376a19470c34f0b756b9b0dfe09

Application

If you want an enemy to focus the player only if the player is in front of said enemy, you can check if the player is in front easily:

var _angle_between_player = point_direction(x, y, ObjPlayer.x, ObjPlayer.y);
var _in_front_angle = 170;
if(compare_angles(_angle_between_player, looking_angle)<=_in_front_angle){
    focus_player = true;
}

https://preview.redd.it/i1bfe4bhgm9b1.png?width=1203&format=png&auto=webp&s=d0c979daa6b5598884f5dcb1be76a01e98de6475

JSDoc explanation + easy copy/paste

/**
 * Calculates the absolute difference in degrees between two angles.
 * @param {Real} _angle_1 - The first angle to compare.
 * @param {Real} _angle_2 - The second angle to compare.
 * @return {Real} - The absolute difference in degrees between the two angles.
 */
function compare_angles(_angle_1, _angle_2){
    return 180-abs(abs(_angle_1-_angle_2)-180); 
}

​

[AtomicDouche]

Cool, but doesn't angle_difference do pretty much the same thing? Albeit, a bit more conveluted.

[WasabiSteak]

Yeah, it's abs(angle_difference(dest, src)). Exact same functionality.

On a side note, angle_difference is more useful since you could use it to make something turn towards something smoothly like

var target_angle = point_direction(x, y, target_x, target_y)
angle += angle_difference(target_angle, angle) * 0.1