hold x midair for tricks

Scripts/Constants.gd

@@ -7,6 +7,7 @@ enum ActionType {
 	JUMP,
 	MOVE,
 	RECOIL,
+	SPIN,
 }
 
 enum UnitCondition {
@@ -20,6 +21,7 @@ enum UnitCurrentAction {
 	IDLE,
 	JUMPING,
 	RECOILING,
+	SPINNING,
 }
 
 enum UnitMovingStatus {
@@ -68,6 +70,7 @@ const UNIT_TYPE_ACTIONS = {
 		ActionType.JUMP,
 		ActionType.MOVE,
 		ActionType.RECOIL,
+		ActionType.SPIN,
 	],
 	UnitType.NPC: [
 		ActionType.MOVE,
@@ -79,6 +82,7 @@ const UNIT_TYPE_CURRENT_ACTIONS = {
 		UnitCurrentAction.IDLE,
 		UnitCurrentAction.JUMPING,
 		UnitCurrentAction.RECOILING,
+		UnitCurrentAction.SPINNING,
 	],
 	UnitType.NPC: [
 		UnitCurrentAction.IDLE,

Scripts/GameScene.gd

@@ -162,3 +162,5 @@ func handle_player_input():
 		and player.unit_conditions[Constants.UnitCondition.IS_ON_GROUND]
 		and input_table[Constants.PlayerInput.GBA_A][I_T_JUST_PRESSED])):
 			player.set_action(Constants.ActionType.JUMP)
+	
+	player.custom_inputs()

Scripts/StageEnvironment.gd

@@ -260,7 +260,9 @@ func check_collision(unit : Unit, collider, collision_into_directions, delta):
 							unit.set_unit_condition(Constants.UnitCondition.IS_ON_GROUND, true)
 							# landed on ground, horizontal component to become magnitude
 							unit.v_speed = 0
+							unit.landed()
 						reangle_move(unit, collider, false)
+						
 					
 					# slope acceleration for DownhillAutoscroller:
 					# set the player's last_contacted_map_elem_type field

Scripts/Unit.gd

@@ -280,3 +280,7 @@ func start_flash():
 func invincibility_ended():
 	# implemented in subclass
 	pass
+
+func landed():
+	# implemented in subclass
+	pass

Scripts/Units/DownhillAutoscrollerPlayer.gd

@@ -5,9 +5,42 @@ class_name DownhillAutoscrollerPlayer
 export var min_speed : float = 3
 export var max_speed : float = 16
 export var player_initiated_acceleration : float = 8
+export var boost_per_second : float = 10
 
 var last_contacted_map_elem_type : int = Constants.MapElemType.SQUARE
 
+var boost : float = 0 # to movement speed
+
+func execute_actions(delta):
+	.execute_actions(delta)
+	for action_num in Constants.UNIT_TYPE_ACTIONS[Constants.UnitType.PLAYER]:
+		if !actions[action_num]:
+			continue
+		match action_num:
+			# handle custom actions
+			Constants.ActionType.SPIN:
+				spin(delta)
+			_:
+				pass
+
+func spin(delta):
+	set_current_action(Constants.UnitCurrentAction.SPINNING)
+	boost += boost_per_second * delta
+
+func reset_current_action():
+	.reset_current_action()
+	if get_current_action() == Constants.UnitCurrentAction.SPINNING:
+		if not actions[Constants.ActionType.SPIN]:
+			set_current_action(Constants.UnitCurrentAction.IDLE)
+
+func custom_inputs():
+	if scene.input_table[Constants.PlayerInput.GBA_B][scene.I_T_JUST_PRESSED]:
+		if not get_condition(Constants.UnitCondition.IS_ON_GROUND, true):
+			set_action(Constants.ActionType.SPIN)
+	if (get_current_action() == Constants.UnitCurrentAction.SPINNING
+	and scene.input_table[Constants.PlayerInput.GBA_B][scene.I_T_PRESSED]):
+		set_action(Constants.ActionType.SPIN)
+
 func process_unit(delta, time_elapsed : float):
 	# always be movin'
 	facing = Constants.Direction.RIGHT
@@ -27,6 +60,8 @@ func process_unit(delta, time_elapsed : float):
 				if (target_move_speed < Constants.UNIT_TYPE_MOVE_SPEEDS[unit_type]
 				and scene.input_table[Constants.PlayerInput.RIGHT][scene.I_T_PRESSED]):
 					target_move_speed = move_toward(target_move_speed, Constants.UNIT_TYPE_MOVE_SPEEDS[unit_type], player_initiated_acceleration * delta)
+				if target_move_speed > max_speed:
+					target_move_speed = move_toward(target_move_speed, max_speed, player_initiated_acceleration * delta)
 			else:
 				# shallow slope: arctan(.5) = 27 degrees, sin(27) = 0.45
 				# steep slope: sin(45) = 0.71
@@ -50,9 +85,9 @@ func process_unit(delta, time_elapsed : float):
 					if ground_influenced_acceleration == 0:
 						# flat ground
 						if scene.input_table[Constants.PlayerInput.RIGHT][scene.I_T_PRESSED]:
-							end_speed = max(target_move_speed, Constants.UNIT_TYPE_MOVE_SPEEDS[unit_type])
+							end_speed = max(min(target_move_speed, max_speed), Constants.UNIT_TYPE_MOVE_SPEEDS[unit_type])
 						else:
-							end_speed = target_move_speed
+							end_speed = min(target_move_speed, max_speed)
 					else:
 						# incline
 						if scene.input_table[Constants.PlayerInput.RIGHT][scene.I_T_PRESSED]:
@@ -62,13 +97,18 @@ func process_unit(delta, time_elapsed : float):
 					if target_move_speed < end_speed:
 						target_move_speed = move_toward(target_move_speed, end_speed, player_initiated_acceleration * delta)
 					else:
-						target_move_speed = move_toward(target_move_speed, end_speed, ground_influenced_acceleration * delta)
+						if ground_influenced_acceleration > 0:
+							target_move_speed = move_toward(target_move_speed, end_speed, ground_influenced_acceleration * delta)
+						else:
+							target_move_speed = move_toward(target_move_speed, end_speed, player_initiated_acceleration * delta)
 				else:
 					var acceleration = ground_influenced_acceleration
 					if scene.input_table[Constants.PlayerInput.RIGHT][scene.I_T_PRESSED]:
 						acceleration = max(acceleration, player_initiated_acceleration)
 					if target_move_speed < max_speed:
 						target_move_speed = move_toward(target_move_speed, max_speed, acceleration * delta)
+					else:
+						target_move_speed = move_toward(target_move_speed, max_speed, player_initiated_acceleration * delta)
 
 	.process_unit(delta, time_elapsed)
 
@@ -92,3 +132,11 @@ func handle_recoil():
 	hit_queued = false
 	# skip recoil pushback logic, since target_move_speed is already
 	# set to min_speed
+
+func landed():
+	if get_current_action() == Constants.UnitCurrentAction.SPINNING:
+		hit(Constants.Direction.RIGHT)
+		boost = 0
+		return
+	target_move_speed += boost
+	boost = 0

Scripts/Units/Player.gd

@@ -90,3 +90,7 @@ func handle_recoil():
 		else:
 			h_speed -= RECOIL_PUSHBACK
 	facing = hit_dir
+
+func custom_inputs():
+	# implemented in subclass
+	pass