From 2ff9042c96d69e4699fce3e0985e4dd3dfcd6009 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Robin=20H=C3=BCbner?= <profan@prfn.se>
Date: Thu, 10 Aug 2017 20:55:15 +0200
Subject: [PATCH] kinematic stuff also steering behaviours testing stuff

---
 EnemyGrunt.gd | 32 +++++++++++++----
 Kinematic.gd  | 98 +++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 124 insertions(+), 6 deletions(-)
 create mode 100644 Kinematic.gd

diff --git a/EnemyGrunt.gd b/EnemyGrunt.gd
index 2db49ad..fba7047 100644
--- a/EnemyGrunt.gd
+++ b/EnemyGrunt.gd
@@ -1,17 +1,37 @@
 extends KinematicBody2D
 
+const km = preload("Kinematic.gd")
+
+var grunt_max_speed = 64 # pixels per second
+var grunt_arrive_radius = 64
 var grunt_rot_speed = deg2rad(22.5) # degrees per second
-var current_target = null
+
+var cur_kinematic
+var s_seek
+var s_arrive
 
 func _ready():
-	var t = get_tree()
-	var r = t.get_root()
-	var n = r.get_node("Game/MinimapControl")
-	n.register_entity(self)
+	var t = get_tree().get_root().get_node("Game/MinimapControl").register_entity(self)
+	set_fixed_process(true)
 	set_process(true)
+	
+	cur_kinematic = km.Kinematic.new(self, grunt_max_speed)
+	s_seek = km.Seek.new(self)
+	s_arrive = km.Arrive.new(self, grunt_arrive_radius)
+	
+	var player = get_tree().get_root().get_node("Game/Player")
+	s_seek.set_target(player)
+	s_arrive.set_target(player)
 
 func type():
 	return "EnemyGrunt"
 	
+func _fixed_process(delta):
+	s_seek.update()
+	s_arrive.update()
+	cur_kinematic.update(s_seek, delta)
+	cur_kinematic.update(s_arrive, delta)
+	
 func _process(delta):
-	rotate(grunt_rot_speed * delta)
+	pass
+	# rotate(grunt_rot_speed * delta)
diff --git a/Kinematic.gd b/Kinematic.gd
new file mode 100644
index 0000000..c61b341
--- /dev/null
+++ b/Kinematic.gd
@@ -0,0 +1,98 @@
+extends Script
+
+class Kinematic:
+	
+	var owner
+	var velocity = Vector2(0, 0) # velocity to apply to position
+	var orientation = Vector2(0, 0) # current orientation
+	var rotation = 0.0 # radians to rotate
+	
+	# per instance custom
+	var max_speed
+	
+	func _init(o, m):
+		owner = o
+		max_speed = m
+	
+	func get_position():
+		return owner.get_global_pos()
+	
+	func get_orientation():
+		return velocity.normalized()
+	
+	func update(steering, delta):
+		
+		owner.move(velocity * delta)
+		owner.set_rot(velocity.normalized().angle())
+		# owner.rotate(rotation * delta)
+		velocity += steering.velocity * delta
+		rotation += steering.rotation * delta
+		
+		# clip at kinematic
+		if velocity.length() > max_speed:
+			velocity = velocity.normalized() * max_speed
+
+class Seek:
+	
+	var owner
+	var target
+	var max_rot_speed = deg2rad(64) # degrees per second
+	
+	# output here
+	var velocity = Vector2(0, 0)
+	var rotation = 0
+	
+	func _init(o):
+		owner = o
+	
+	func update():
+		var tr = target.get_ref()
+		if tr:
+			# update velocity
+			velocity = tr.get_global_pos() - owner.get_global_pos()
+			# update orientation
+			#if velocity.length() > 0:
+			#	rotation = clamp(velocity.normalized().angle(), -max_rot_speed, max_rot_speed)
+		else:
+			target = null
+	
+	func set_target(t):
+		target = weakref(t)
+		
+class Arrive:
+	
+	var owner
+	var target
+	var velocity = Vector2(0, 0)
+	var rotation = 0
+	
+	# custom
+	var radius = 0
+	var time_to_target = 1
+	
+	func _init(o, r):
+		owner = o
+		radius = r
+	
+	func update():
+		var tr = target.get_ref()
+		if tr:
+			if velocity.length() < radius:
+				velocity.x = 0
+				velocity.y = 0
+			velocity /= time_to_target
+		else:
+			target = null
+	
+	func set_target(t):
+		target = weakref(t)
+
+class Flee:
+	func init():
+		pass
+		
+	func get_steering():
+		pass
+
+func _ready():
+	pass