From b384856adeed758ce3fe395f6b973639f21fc4d8 Mon Sep 17 00:00:00 2001
From: cel 🌸 <cel@blos.sm>
Date: Sun, 9 Jul 2023 16:21:38 +0100
Subject: add borders

---
 Scripts/Road.gd | 40 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 37 insertions(+), 3 deletions(-)

(limited to 'Scripts/Road.gd')

diff --git a/Scripts/Road.gd b/Scripts/Road.gd
index e0b69a1..4b19c70 100644
--- a/Scripts/Road.gd
+++ b/Scripts/Road.gd
@@ -1,18 +1,20 @@
 extends Line2D
 
-var epsilon = 20
+var epsilon = 2
+
+@onready var leftBorder = $LeftBorder
+@onready var rightBorder = $RightBorder
 
 # Called when the node enters the scene tree for the first time.
 func _ready():
 	pass # Replace with function body.
 
-
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta):
 	pass
 
 func simplify():
-	points = simplify_rec(points, 5)
+	points = simplify_rec(points, epsilon)
 
 func simplify_rec(pointArray: PackedVector2Array, epsilon: float):
 	var dmax = 0
@@ -46,3 +48,35 @@ func find_perpendicular_distance(p: Vector2, p1: Vector2, p2: Vector2):
 		result = abs(slope * p.x - p.y + intercept) / sqrt(pow(slope, 2) + 1)
 	
 	return result
+
+func get_bisector(left_side: bool, p2: Vector2, p1: Vector2 = p2, p3: Vector2 = p2):
+	var v1 = (p2 - p1).normalized()
+	var v2 = (p2 - p3).normalized()
+	var normal
+	if v1 == -v2:
+		normal = v2.rotated(-PI/2)
+	else:
+		normal = (v1 + v2).normalized()
+		if v2.rotated(-PI/2).dot(v1) < 0:
+			normal = -normal
+	
+	if left_side:
+		normal = -normal
+	return normal
+
+
+func draw_borders():
+	for pointIndex in range(0, points.size() - 1):
+		var normal
+		if pointIndex == 0:
+			continue
+		elif pointIndex == points.size() -1:
+			continue
+			#normal = Vector2.ZERO
+		else:
+			normal = get_bisector(true, points[pointIndex], points[pointIndex-1], points[pointIndex+1])
+		
+		var point = points[pointIndex] + (normal*50)
+		leftBorder.add_point(point)
+		point = points[pointIndex] - (normal*50)
+		rightBorder.add_point(point)
-- 
cgit