Topic was automatically imported from the old Question2Answer platform.
Asked By
NoxL
Hello,
I am pretty new to Godot and to programming (and I’m in love with this engine !)
After learning how to make a plateformes and the basics, I tried making a game
where an object follows the mouse and create a trail. The thing is that I want to detect when the trail crosses itself (here is an exemple), and if an object is inside the area it created. (Here is an image explaining all of this : Screenshot-Game hosted at ImgBB — ImgBB)
Thank you
Script of my line2D :
extends Line2D
onready var point
onready var trail_length = 50
func _process(delta):
set_as_toplevel(true)
point = get_parent().get_parent().global_position
add_point(point)
while (get_point_count() > trail_length):
remove_point(0)
pass
Script of my player
extends KinematicBody2D
var velocity = Vector2()
var speed = 5
func _process(delta):
var mouse_pos = get_viewport().get_mouse_position()
var player_pos = get_position()
velocity = (mouse_pos - player_pos) * speed
move_and_slide(velocity, Vector2(0, -1))
You’re image is broken, but I think I understand what you’re trying to do. I don’t think there’s a magic-bullet for what you want, but I’d guess you could build it fairly easily using some of Godot’s basic Geometry functions. For instance, these will likely be handy:
segment_intersects_segment_2d - find intersection between 2 line segments is_point_in_polygon - determine if a point is inside a polygon
Basically, you’ll need to see if your “line segments” have any intersections (by iterating through the segments and comparing them via segment_intersects_segment_2d). If they don’t, you’re done. If you find an intersection, you’ll need to create a collection of points consisting of that intersection point and all of the points “between” the 2 segments found to have the intersection (including the last point of the first intersecting segment and the first point of the second intersecting segment) - in that order.
That list of points could be used to construct a “containing” polygon - which could be used to find objects “inside” using any number of methods (potentially including is_point_in_polygon).
