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Dustin 2025-05-08 23:56:09 -07:00
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var velocity :Vector2
var debug :bool = false
enum RANGE_PLACEMENT {
BEFORE_RANGE = -1,
WITHIN_RANGE = 0,
PAST_RANGE = 1
}
## Side effects for these variables
# velocity - doesn't change but uses it to set base calculations
# accepts the state to determine movement, the deltatime, and an optional direction
# Update: Actually should just return movement in PPS
##
## Could these be datatypes or a class? Sure
var _h_impulse_applied :bool = false
var _h_impulse_speed_tracking :Vector2
var _v_impulse_applied :bool = false
var _v_impulse_speed_tracking :Vector2
func calculate_velocity(_delta :float,
movement_parameters :MovementParameters,
_movement_direction := Vector2(0,0),
_velocity_override := Vector2(0,0)) -> Vector2:
var calc_velocity = Vector2.ZERO
if _velocity_override.x != 0.0:
calc_velocity.x = _velocity_override.x
else:
calc_velocity.x = velocity.x
if _velocity_override.y != 0.0:
calc_velocity.y = _velocity_override.y
else:
calc_velocity.y = velocity.y
var calc_acceleration = Vector2.ZERO
var calc_inertia :Vector2
#calc_inertia.x = abs(calc_velocity.x)
## We're now toing to preserve inertia direction
calc_inertia.x = calc_velocity.x
calc_inertia.y = calc_velocity.y
var calc_inertial_dir = Vector2(sign(calc_velocity.x),sign(calc_velocity.y))
#var calc_friction :Vector2 = Vector2.ZERO
## Determine movement direction
# If there is an inertia direction from existing velocity and
# no desired movement we'll continue to travel in that direction.
##
## If an override has been passed (we're ignoring input direction
var move_direction = Vector2.ZERO
move_direction = resolve_move_direction(calc_inertia, _movement_direction)
# else:
# move_direction = resolve_move_direction(calc_inertia, desired_movement_vector)
#var movement_parameters :MovementParameters = _state.get_movement_parameters()
# if modifier and modifier.is_active:
# if (_state.is_grounded and modifier.only_grounded): # Should we skip
# modifier_indicator = '*'
# if _state.name == 'jump':
# var foo = 2+2 # break
# movement_parameters.apply_state_modifier(modifier, move_direction.x)
## Inertia only applies if there is a difference between the
# base move speed and a derived move speed. This makes it so all you
# have to do is provide a move speed and that is the speed we will travel.
# but if a modifier applies, or an accelleration is given.
# an entirely differant process occurs.
# h_speed.x can be thought of as impulse speed. While h_speed.y
# is the destination speed.
# We move towards h_speed.y at the acceleration rate
##
var h_speed = resolve_h_speed(movement_parameters)
var v_speed = resolve_v_speed(movement_parameters)
## Speed will now be expected to move in the direction of travel
h_speed *= move_direction.x
v_speed *= move_direction.y
## Now determine placement of current velocity to speed range
var h_range_placement = placement_to_speed_range(calc_velocity.x, h_speed)
var v_range_placement = placement_to_speed_range(calc_velocity.y, v_speed)
## We don't want to be able to scoot our impulse speed to cheat the movement
# Any non zero speed that goes opposite to our inertial direction
# should only be allowed once.
## Reset the impulse when back in range
# may also want to reset when hspeed is static
if (h_range_placement == RANGE_PLACEMENT.WITHIN_RANGE and
_h_impulse_applied == true ):
print("resetting H impulse")
_h_impulse_applied = false
if (v_range_placement == RANGE_PLACEMENT.WITHIN_RANGE and
_v_impulse_applied == true ):
print("resetting V impulse")
_v_impulse_applied = false
## Acceleration is always postive because we use the
# move toward functions.
calc_acceleration.x = abs(resolve_h_acceleration(movement_parameters, move_direction.x))
## We are always moving from h_speed.x towards y at a given rate
## if we have a difference of speed and an acceleration
##TODO: The Min Max could be augmented to just be h_speed.x and prevent the sliding.
if h_speed.x != h_speed.y and calc_acceleration.x != 0.0:
var direction_accel :float = calc_acceleration.x * _delta #* move_direction.x
if h_speed.x > h_speed.y:
direction_accel *= -1
match h_range_placement:
RANGE_PLACEMENT.BEFORE_RANGE:
## Also apply impulse here
if _h_impulse_applied == false:
calc_inertia.x += h_speed.x
_h_impulse_applied = true
#impulse_applied_dir = move_direction.x
calc_inertia.x = clamp(calc_inertia.x + direction_accel,
min(calc_inertia.x, h_speed.y),
max(calc_inertia.x, h_speed.y))
RANGE_PLACEMENT.WITHIN_RANGE:
## If we're within the range but our speed has just changed
if _h_impulse_applied == false and _h_impulse_speed_tracking != h_speed:
## Set inertia to starting speed, we're already in range
calc_inertia.x = h_speed.x
_h_impulse_applied = true
calc_inertia.x = clamp(calc_inertia.x + direction_accel,
min(h_speed.x, h_speed.y),
max(h_speed.x, h_speed.y))
RANGE_PLACEMENT.PAST_RANGE:
calc_inertia.x = clamp(calc_inertia.x - direction_accel, # Friction
min(calc_inertia.x, h_speed.y),
max(calc_inertia.x, h_speed.y))
elif calc_inertia.x != 0.0 and calc_acceleration.x != 0.0: ## We still have inertia but no difference in movement
if h_speed.x < h_speed.y:
h_speed.x = clamp(h_speed.x,0.0,h_speed.y)
## Move back towards the base speed
calc_inertia.x = move_toward(calc_inertia.x, h_speed.x, calc_acceleration.x * _delta)
else:
## inertia is just base speed
calc_inertia.x = h_speed.x
calc_inertial_dir.x = 0.0 # sign(calc_inertia.x)
## Another idea, just return the calculated velocity in PPS
## For now, y component of velocity is just gravity
if v_speed.x != v_speed.y: ## For now gravity is just the default acceleration
var direction_accel :float = movement_parameters.gravity * _delta #* move_direction.x
if v_speed.x > v_speed.y:
direction_accel *= -1
match v_range_placement:
RANGE_PLACEMENT.BEFORE_RANGE:
## Also apply impulse here
if _v_impulse_applied == false:
calc_inertia.y += v_speed.x
_v_impulse_applied = true
#impulse_applied_dir = move_direction.x
calc_inertia.y = clamp(calc_inertia.y + direction_accel,
min(calc_inertia.x, v_speed.y),
max(calc_inertia.x, v_speed.y))
RANGE_PLACEMENT.WITHIN_RANGE:
## If we're within the range but our speed has just changed
if _v_impulse_applied == false and _v_impulse_speed_tracking != v_speed:
## Set inertia to starting speed, we're already in range
calc_inertia.y = v_speed.x
_v_impulse_applied = true
calc_inertia.y = clamp(calc_inertia.y + direction_accel,
min(v_speed.x, v_speed.y),
max(v_speed.x, v_speed.y))
RANGE_PLACEMENT.PAST_RANGE:
calc_inertia.y = clamp(calc_inertia.y - direction_accel, # Friction
min(calc_inertia.y, v_speed.y),
max(calc_inertia.y, v_speed.y))
else:
## The previous vertical movement methods
calc_inertia.y += movement_parameters.gravity * _delta
## Track or last speed for in range impulses
_h_impulse_speed_tracking = h_speed
_v_impulse_speed_tracking = v_speed
calc_velocity.y = calc_inertia.y
calc_velocity.x = calc_inertia.x
if debug:
UiManager.debug_text = ( #"H_Speed x Dir: " + str(h_speed) + str('duh') +
"H_Speed Fm:{0} To:{1}".format({"0":"%5.2f" % h_speed.x, "1":"%5.2f" % h_speed.y}) +
"\nV_Speed Fm:{0} To:{1}".format({"0":"%5.2f" % v_speed.x, "1":"%5.2f" % v_speed.y}) +
"\nSpeedRange : {0}, {1}".format({"0":"%5.2f" % h_range_placement, "1":"%5.2f" % v_range_placement}) +
"\nVelocity_Calc: {0}, {1}".format({"0":"%5.2f" % calc_velocity.x, "1":"%5.2f" % calc_velocity.y}) +
"\nInertia_Calc: {0}, {1}".format({"0":"%5.2f" % calc_inertia.x, "1":"%5.2f" % calc_inertia.y}) +
"\nVelocity_Real: {0}, {1}".format({"0":"%5.2f" % velocity.x, "1":"%5.2f" % velocity.y}) +
#"\nFriction: {0}, {1}".format({"0":"%5.2f" % calc_friction.x, "1":"%5.2f" % calc_friction.y}) +
"\nAccelCalc : {0}, {1}".format({"0":"%5.2f" % calc_acceleration.x, "1":"%5.2f" % calc_acceleration.y}) +
# h_range_placement
#"\nLength: " + str(velocity.length()) +
"\nMoveDir: {0}, {1}".format({"0":"%4.1f" % move_direction.x, "1":"%4.1f" % move_direction.y})
)
return calc_velocity
func is_out_of_range(value: float, a: float, b: float) -> bool:
var lower = min(a, b)
var upper = max(a, b)
return value <= lower or value >= upper
## Determine the trend of direction and where our current speed is
# in relation to it. This should help determine the direction of
# acceleration and whether we speed up or slow down.
##
func placement_to_speed_range(speed: float, speed_range: Vector2) -> int:
## Actually we don't care about mix or min
#var range_start :float = min(speed_range.x, speed_range.y)
#var range_end :float = max(speed_range.x, speed_range.y)
## We can be at the base range to ensure impulse can happen
## Direction <-- that way
if speed_range.x > speed_range.y:
if speed < speed_range.x and speed >= speed_range.y:
return RANGE_PLACEMENT.WITHIN_RANGE
elif speed < speed_range.y:
return RANGE_PLACEMENT.PAST_RANGE
else:
return RANGE_PLACEMENT.BEFORE_RANGE
else: ## Direction --> that way
if speed > speed_range.x and speed <= speed_range.y:
return RANGE_PLACEMENT.WITHIN_RANGE
elif speed > speed_range.y:
return RANGE_PLACEMENT.PAST_RANGE
else:
return RANGE_PLACEMENT.BEFORE_RANGE
return 0
## Returns an Vector where x is MIN_SPEED and y is MAX_SPEED
func resolve_h_speed(_params :MovementParameters) -> Vector2:
var base_speed :float = _params.base_move_speed.x
## if a speed difference applies
if _params.move_speed_modifier.x != 0:
var speed_differance = base_speed + _params.move_speed_modifier.x
return(Vector2(base_speed, speed_differance))
return Vector2(base_speed,base_speed)
func resolve_v_speed(_params :MovementParameters) -> Vector2:
var base_speed :float = _params.base_move_speed.y
## if a speed difference applies
if _params.move_speed_modifier.y != 0:
var speed_differance = base_speed + _params.move_speed_modifier.y
return(Vector2(base_speed, speed_differance))
return Vector2(base_speed,base_speed)
func resolve_h_acceleration(_params :MovementParameters, _move_direction :float) -> float:
## TODO: Adjust for jerk, determine if we're currently experiencing accel
## if a speed difference applies
var _acceleration :float = 0.0
var base_speed :float = _params.base_move_speed.x
if _params.move_speed_modifier.x != 0:
var speed_differance = base_speed + _params.move_speed_modifier.x
_acceleration = _params.base_move_acceleration.x + _params.move_speed_modifier_acceleration.x
##WIP: Add part where offset acceleration only applies until the inertia equals the offset or whatever
# if sign(_params["_base_h_move_modifier_move_acceleration"]) == -1 and abs(_inertia.x) >= speed_differance:
# #print("I should add the modifier acceleration maybe?")
# _acceleration += _params["_base_h_move_modifier_move_acceleration"]
# else:
# print ("not yet.")
else:
_acceleration = _params.base_move_acceleration.x
## This works but I want to try something differant.
# if _inertia.x != 0.0 and sign(_inertia.x) != sign(_move_direction):
# return _acceleration * -1
# elif sign(_move_direction) != 0:
# ## If no velocity or it matches just return as is.
# return _acceleration
if sign(_move_direction) != 0:
return _acceleration
# No accel returned unless intended
return 0.0
func resolve_move_direction(_momentum :Vector2,
_movement_direction :Vector2) -> Vector2:
var horizontal_movement_direction:float
if sign(_movement_direction.x): ## We're trying to move
horizontal_movement_direction = sign(_movement_direction.x)
elif sign(_momentum.x): ## We still have momentum but not trying to move
horizontal_movement_direction = sign(_momentum.x)
var vertical_movement_direction:float
if sign(_movement_direction.y):
vertical_movement_direction = sign(_movement_direction.y)
elif sign(_momentum.y):
vertical_movement_direction = sign(_momentum.y)
return Vector2(horizontal_movement_direction, vertical_movement_direction)