68 lines
2.1 KiB
GDScript
68 lines
2.1 KiB
GDScript
# The MIT License (MIT)
|
|
#
|
|
# Copyright (c) 2018 George Marques
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in all
|
|
# copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
# SOFTWARE.
|
|
|
|
# Sorter for polygon vertices
|
|
tool
|
|
extends Reference
|
|
|
|
var center
|
|
|
|
# Sort the vertices of a convex polygon to clockwise order
|
|
# Receives a PoolVector2Array and returns a new one
|
|
func sort_polygon(vertices):
|
|
vertices = Array(vertices)
|
|
|
|
var centroid = Vector2()
|
|
var size = vertices.size()
|
|
|
|
for i in range(0, size):
|
|
centroid += vertices[i]
|
|
|
|
centroid /= size
|
|
|
|
center = centroid
|
|
vertices.sort_custom(self, "is_less")
|
|
|
|
return PoolVector2Array(vertices)
|
|
|
|
# Sorter function, determines which of the poins should come first
|
|
func is_less(a, b):
|
|
if a.x - center.x >= 0 and b.x - center.x < 0:
|
|
return false
|
|
elif a.x - center.x < 0 and b.x - center.x >= 0:
|
|
return true
|
|
elif a.x - center.x == 0 and b.x - center.x == 0:
|
|
if a.y - center.y >= 0 or b.y - center.y >= 0:
|
|
return a.y < b.y
|
|
return a.y > b.y
|
|
|
|
var det = (a.x - center.x) * (b.y - center.y) - (b.x - center.x) * (a.y - center.y)
|
|
if det > 0:
|
|
return true
|
|
elif det < 0:
|
|
return false
|
|
|
|
var d1 = (a - center).length_squared()
|
|
var d2 = (b - center).length_squared()
|
|
|
|
return d1 < d2
|