aggro range and sight | gml

objPlayer Step

x += (keyboard_check(vk_right) - keyboard_check(vk_left))*3;
y += (keyboard_check(vk_down) - keyboard_check(vk_up))*3;
move_bounce_all(true); //lazy way to do collisions

objCreeper Step

var in_range = false;
// CHECK IF PLAYER IS WITHIN AGGRO RANGE OF 100 PIXELS OF CREEPER:
if (distance_to_object(objPlayer) <= 100){
    in_range = true;
}
    
var can_see = false;
// GET ANY INSTANCE OF A WALL BETWEEN MY SELF (CREEPER) AND PLAYER:
if collision_line(x,y,objPlayer.x,objPlayer.y,objWall,false,true) == noone {
    can_see = true;
}

//---------------------------------------------------------------
//collision_line( x1, y1, x2, y2, obj, prec, notme );
//^^ prec = per-pixel collisions, true = slow!
//^^ notme =  exclude instance calling the function (if relevant) 
//---------------------------------------------------------------

if (in_range and can_see) {
    direction = point_direction(x,y,objPlayer.x,objPlayer.y);
    speed = 2;
}
else{
    speed = 0;
}

move_bounce_all(true); //lazy way to do collisions