From ae7b7226c64e7b9ce62e045991c315040563fe5a Mon Sep 17 00:00:00 2001
From: cel 🌸 <cel@blos.sm>
Date: Sun, 9 Jul 2023 14:02:37 +0100
Subject: road simplification via Ramer–Douglas–Peucker
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 Scripts/Road.gd    | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 Scripts/drawing.gd |  3 ++-
 2 files changed, 50 insertions(+), 1 deletion(-)
 create mode 100644 Scripts/Road.gd

(limited to 'Scripts')

diff --git a/Scripts/Road.gd b/Scripts/Road.gd
new file mode 100644
index 0000000..e0b69a1
--- /dev/null
+++ b/Scripts/Road.gd
@@ -0,0 +1,48 @@
+extends Line2D
+
+var epsilon = 20
+
+# 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)
+
+func simplify_rec(pointArray: PackedVector2Array, epsilon: float):
+	var dmax = 0
+	var index = -1
+	if pointArray.size() < 3:
+		return pointArray
+	var end = pointArray.size() - 1
+	for i in range(1, end-1):
+		var d = find_perpendicular_distance(pointArray[i], pointArray[0], pointArray[end])
+		if d > dmax:
+			index = i
+			dmax = d
+	
+	if dmax > epsilon:
+		var recResults1 = simplify_rec(pointArray.slice(0, index), epsilon)
+		var recResults2 = simplify_rec(pointArray.slice(index, end), epsilon)
+		recResults1.append_array(recResults2)
+		return recResults1
+	else:
+		return [pointArray[0], pointArray[end]]
+
+func find_perpendicular_distance(p: Vector2, p1: Vector2, p2: Vector2):
+	var result
+	var slope
+	var intercept
+	if p1.x == p2.x:
+		result = p.x - p1.x
+	else:
+		slope = (p2.y - p1.y) / (p2.x - p1.x)
+		intercept = p1.y - (slope * p1.x)
+		result = abs(slope * p.x - p.y + intercept) / sqrt(pow(slope, 2) + 1)
+	
+	return result
diff --git a/Scripts/drawing.gd b/Scripts/drawing.gd
index 61896f9..c45196b 100644
--- a/Scripts/drawing.gd
+++ b/Scripts/drawing.gd
@@ -2,7 +2,7 @@ extends Node
 
 var drawing = false
 
-@onready var line: Line2D = $TrackLine
+@onready var line = $Road
 @onready var path: Path2D = $TrackPath
 
 func _ready():
@@ -16,6 +16,7 @@ func start_drawing():
 
 func _end_drawing():
 	drawing = false
+	line.simplify()
 	owner.set_driving(true)
 
 
-- 
cgit 


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 +++++++++++++++++++++++++++++++++++++---
 Scripts/drawing.gd |  4 +++-
 2 files changed, 40 insertions(+), 4 deletions(-)

(limited to 'Scripts')

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)
diff --git a/Scripts/drawing.gd b/Scripts/drawing.gd
index c45196b..a8068a2 100644
--- a/Scripts/drawing.gd
+++ b/Scripts/drawing.gd
@@ -17,13 +17,15 @@ func start_drawing():
 func _end_drawing():
 	drawing = false
 	line.simplify()
+	line.draw_borders()
+	for point in line.points:
+		path.curve.add_point(point)
 	owner.set_driving(true)
 
 
 func _input(event):
 	if drawing and event is InputEventMouseMotion:
 		line.add_point(event.position)
-		path.curve.add_point(event.position)
 
 
 func reset():
-- 
cgit