added a very basic boat simulation

resources/scenes/Player.gd

@@ -0,0 +1,37 @@
+extends KinematicBody2D
+
+const WIND = 20
+const SPEED = 400
+const STEERING = deg2rad(5)
+const WINDLIMIT = deg2rad(180-45)
+const WINDDIR = Vector2(0,1)
+const STEERPEN = 1
+const ACCELERATION = 2
+
+var velocity = Vector2(0,10)
+
+func _calculate_velocity(_velocity, _acceleration, _rotation):
+	velocity = _velocity * _acceleration
+	velocity = velocity.clamped(_calculate_maxspeed())
+	return velocity.rotated(_rotation)
+
+func _calculate_maxspeed():
+	var angle_to_wind = WINDDIR.angle_to(velocity)
+	if angle_to_wind > WINDLIMIT || angle_to_wind < -WINDLIMIT:
+		return 0.1
+	else:
+		return 75
+
+func _physics_process(_delta):
+	if Input.is_action_pressed("right"):
+		velocity = _calculate_velocity(velocity, STEERPEN, STEERING)
+		rotate(STEERING)
+	elif Input.is_action_pressed("left"):
+		velocity = _calculate_velocity(velocity, STEERPEN, -STEERING)
+		rotate(-STEERING)
+	else:
+		velocity = _calculate_velocity(velocity, ACCELERATION, 0)
+	velocity = move_and_slide(velocity)
+
+func _ready():
+	pass