first commit

CarSprite.gd

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+extends AnimatedSprite
+
+enum { RIGHT, DOWN_RIGHT, DOWN, DOWN_LEFT, LEFT, UP_LEFT, UP, UP_RIGHT }
+
+var sprite := UP
+export (int) var threshold = 5  # Range to snap around axis direction, in degrees.
+
+var time = 0.0
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass # Replace with function body.
+
+func _process(delta):
+	"""
+	The sprite has its own representation of rotation, so we need to tweak things.
+	The sprite inherits orientation from its parent (track) that must be canceled.
+	"""
+	var global = get_global_rotation_degrees()
+	var local = get_rotation_degrees()
+	var total = wrapf(global - local, -180.0, 180.0)
+	var r = snap_rotation(total)
+	if _update_sprite(r):
+		print_debug("frame changed")
+		set_frame(sprite)
+		# We can just cancel out the "part of" the rotation
+		# embedded in the sprites, leaving out a small
+		# rotation for dynamic effect...
+		#set_rotation_degrees(-r)
+	# ...Or we just cancel out everything
+	set_rotation_degrees(-total)
+		
+	get_node("/root/Track2/HBoxContainer/Rotation").set_text("%.1f°" % r)
+	time += delta
+	if time >= 0.1:
+		print_debug("%.1f" % get_rotation_degrees(), "° | global: ", "%.1f" % get_global_rotation_degrees(), "°")
+
+
+func snap_rotation(r):
+	""" 
+	Snap rotation to multiples of 45°
+		Also snaps within a certain range of direction axis
+	"""
+	if r >= 0 - threshold and r <= 0 + threshold: # Right
+		r = 0
+	elif r >= 180 - threshold or r <= -180 + threshold: # Left
+		r = 180
+	elif r >= 90 - threshold and r <= 90 + threshold: # Down
+		r = 90
+	elif r >= -90 - threshold and r <= -90 + threshold: # Up
+		r = -90
+	elif r > 0 + threshold and r < 90 - threshold:
+		r = 45
+	elif r > 90 + threshold and r < 180 - threshold:
+		r = 135
+	elif r > -90 + threshold and r < 0 - threshold:
+		r = -45
+	elif r > -180 + threshold and r < -90 - threshold:
+		r = -135
+	return r	
+
+
+func _update_sprite(rotation):
+	""" 
+	Updates the sprite index given direction of movement.
+		Returns true if sprite was updated, false otherwise.
+	"""
+	var previous = sprite
+	# Use a specific algorithm according to difficulty mode
+	#__set_sprite_from_direction(round(direction.x), round(direction.y)) ## if abs(direction.y) > 0.1 else 0
+	__set_sprite_from_rotation( rotation )
+	return previous != sprite
+
+
+func __set_sprite_from_direction(x, y):
+	""" Set the matching sprite according to given direction vector """
+	if x != 0 and y != 0:
+		if x < 0 and y < 0:
+			sprite = UP_LEFT
+		elif x < 0 and y > 0:
+			sprite = DOWN_LEFT
+		elif x > 0 and y < 0:
+			sprite = UP_RIGHT
+		elif x > 0 and y > 0:
+			sprite = DOWN_RIGHT
+	elif x != 0:
+		if x < 0:
+			sprite = LEFT
+		else:
+			sprite = RIGHT
+	elif y != 0:
+		if y < 0:
+			sprite = UP
+		else:
+			sprite = DOWN
+
+
+func __set_sprite_from_rotation(r: int):
+	""" Set the matching sprite according to given rotation (in degrees) """
+	match r:
+		0: sprite = RIGHT
+		45: sprite = DOWN_RIGHT
+		90: sprite = DOWN
+		135: sprite = DOWN_LEFT
+		180, -180: sprite = LEFT
+		-45: sprite = UP_RIGHT
+		-90: sprite = UP
+		-135: sprite = UP_LEFT
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+#func _process(delta):
+#	pass