112 lines
4.0 KiB
GDScript
112 lines
4.0 KiB
GDScript
extends Node
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class_name StateGrapple
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## Swing grapple with active rope control:
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## - the rope acts as a hard pendulum constraint at its current length
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## - holding forward reels in (rope shortens, converts to speed)
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## - holding back pays rope out (up to the original latch length)
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## - strafe input steers tangentially around the swing sphere
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## - jump detaches with a boost along your current motion
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var machine: MovementStateMachine
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var params: MovementParams:
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get: return machine.params
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var _rope_length: float = 0.0
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func enter(_data: Dictionary = {}) -> void:
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machine.on_ground = false
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machine.wall_normal = Vector3.ZERO
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machine.wall_side = 0.0
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machine.register_chain_mechanic("grapple")
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_rope_length = machine.grapple_length
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func exit() -> void:
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pass
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func update(delta: float) -> void:
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var player := machine.player
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var vel: Vector3 = player.velocity
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# If player releases the button, disconnect
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if not machine.input_grapple:
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machine.switch_to("air")
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return
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var grapple_pos: Vector3 = machine.grapple_point
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var to_point: Vector3 = grapple_pos - player.global_position
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var current_dist: float = to_point.length()
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if current_dist < 0.01:
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machine.switch_to("air")
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return
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var dir_to_point: Vector3 = to_point / current_dist
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# Jump to detach and get a boost
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if machine.input_jump_just_pressed and machine.jump_cooldown_timer <= 0.0:
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vel.y = maxf(vel.y, params.jump_velocity)
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# Boost along current motion so the release keeps the swing's energy
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var h_vel := Vector3(vel.x, 0.0, vel.z)
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if h_vel.length_squared() > 0.1:
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var boost := h_vel.normalized() * params.grapple_jump_boost * 0.5
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vel.x += boost.x
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vel.z += boost.z
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# Plus a steer boost toward held direction
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var h_look = machine.wish_dir_world
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if h_look.length_squared() > 0.1:
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var h_boost = h_look.normalized() * params.grapple_jump_boost * 0.5
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vel.x += h_boost.x
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vel.z += h_boost.z
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player.velocity = vel
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machine.jump_cooldown_timer = params.jump_cooldown
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machine.register_chain_mechanic("grapple_jump")
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machine.movement_event.emit("jump", {"kind": "grapple_jump"})
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machine.switch_to("air")
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if player.jump_player:
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player.jump_player.play()
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return
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# Apply gravity
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vel.y -= params.gravity * delta
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# Base reel: constant gentle pull toward the hook
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vel += dir_to_point * params.grapple_pull_force * delta
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# ── Active rope control ───────────────────────────────────────────────
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var fwd_input := -machine.input_dir.y # +1 holding forward, -1 back
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if fwd_input > 0.1:
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# Reel in: shorten rope and pull hard — converts to swing speed
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vel += dir_to_point * params.grapple_reel_force * fwd_input * delta
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_rope_length = maxf(_rope_length - 8.0 * fwd_input * delta, 2.0)
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elif fwd_input < -0.1:
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# Pay out rope back toward the original latch length
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_rope_length = minf(_rope_length + 8.0 * -fwd_input * delta, machine.grapple_length)
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# Keep the working length taut to where we actually are (swinging inside
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# the sphere shortens the constraint, giving crisp Tarzan arcs)
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_rope_length = minf(_rope_length, maxf(current_dist, 2.0))
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# ── Pendulum constraint at the current rope length ────────────────────
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if current_dist > _rope_length:
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# Kill outward radial velocity (the rope is taut and inextensible)
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var radial_vel = vel.project(dir_to_point)
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if radial_vel.dot(dir_to_point) < 0:
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vel -= radial_vel
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# Spring correction toward the sphere surface
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var diff = current_dist - _rope_length
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vel += dir_to_point * diff * params.grapple_spring_strength * delta
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# ── Tangential steering (strafe around the swing sphere) ──────────────
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var strafe_input := machine.input_dir.x
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if absf(strafe_input) > 0.1:
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var right := player.global_transform.basis.x
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var tangent_steer := right - right.project(dir_to_point)
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if tangent_steer.length_squared() > 0.01:
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vel += tangent_steer.normalized() * params.grapple_air_control * strafe_input * delta
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player.velocity = vel
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player.move_and_slide()
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