310 lines
12 KiB
GDScript
310 lines
12 KiB
GDScript
extends Area2D
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const IMPACT_EFFECT_SCENE := preload("res://scenes/game/impact_effect.tscn")
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const PLASMA_TEXTURE := preload("res://assets/other/bullet.png")
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const PLASMA_VISUAL_WIDTH := 24.0
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var enemy_shot := false
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var direction := Vector2.UP
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var projectile_speed := 600.0
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var damage := 1.0
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var is_critical := false
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var max_range := 800.0
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var weapon_kind := ItemDefinition.WeaponKind.PLASMA
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var homing_target: Node2D
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var missile_homing := true
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var homing_turn_acceleration := 5.0
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var homing_max_turn_speed := 3.0
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var missile_steering_acceleration := 1400.0
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var target_acquisition_range := 360.0
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var seeker_arm_delay := 0.35
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var _flight_velocity := Vector2.ZERO
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var _heading := 0.0
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var _turn_velocity := 0.0
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var _flight_time := 0.0
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var _launch_wobble_phase := 0.0
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var _has_locked_target := false
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var _distance_travelled := 0.0
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var _already_hit: Dictionary = {}
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var _impact_handled := false
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var _engine_time := 0.0
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var _smoke_emission_timer := 0.0
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var _smoke_puffs: Array[Dictionary] = []
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func _ready() -> void:
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body_entered.connect(_on_body_entered)
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area_entered.connect(_on_area_entered)
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rotation = direction.angle()
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func configure(
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start_position: Vector2,
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travel_direction: Vector2,
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kind: int,
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speed: float,
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projectile_damage: float,
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projectile_range: float,
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target: Node2D = null,
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critical_hit: bool = false
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) -> void:
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global_position = start_position
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direction = travel_direction.normalized()
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_heading = direction.angle()
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weapon_kind = kind
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projectile_speed = speed
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_flight_velocity = direction * projectile_speed
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_launch_wobble_phase = randf_range(0.0, TAU)
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damage = projectile_damage
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is_critical = critical_hit
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max_range = projectile_range
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homing_target = target
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func _physics_process(delta: float) -> void:
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var travel_velocity := direction * projectile_speed
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if weapon_kind == ItemDefinition.WeaponKind.MISSILE and missile_homing:
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if is_instance_valid(homing_target) and homing_target.is_in_group("virus_allies") and not enemy_shot:
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homing_target = null
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_flight_time += delta
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if not is_instance_valid(homing_target):
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_has_locked_target = false
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if _flight_time >= seeker_arm_delay:
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homing_target = _find_enemy_in_acquisition_range()
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_has_locked_target = is_instance_valid(homing_target)
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var desired_turn_velocity := 0.0
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if is_instance_valid(homing_target):
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var to_target := homing_target.global_position - global_position
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if to_target.length_squared() > 0.001:
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var target_velocity := Vector2.ZERO
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if homing_target is CharacterBody2D:
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target_velocity = homing_target.velocity
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var estimated_intercept_time := to_target.length() / maxf(projectile_speed, 1.0)
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var lead_time := minf(estimated_intercept_time, 2.0)
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var predicted_target_position := homing_target.global_position + target_velocity * lead_time
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var angle_error := wrapf(
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(predicted_target_position - global_position).angle() - _heading,
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-PI,
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PI
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)
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desired_turn_velocity = clampf(
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angle_error * 4.0,
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-homing_max_turn_speed,
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homing_max_turn_speed
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)
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_turn_velocity = move_toward(
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_turn_velocity,
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desired_turn_velocity,
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homing_turn_acceleration * delta
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)
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_heading += _turn_velocity * delta
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var wobble_strength := 0.16 * exp(-3.2 * _flight_time)
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var wobble_angle := sin(_flight_time * 17.0 + _launch_wobble_phase) * wobble_strength
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direction = Vector2.RIGHT.rotated(_heading + wobble_angle)
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var desired_velocity := direction * projectile_speed
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_flight_velocity = _flight_velocity.move_toward(
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desired_velocity,
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missile_steering_acceleration * delta
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)
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travel_velocity = _flight_velocity
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rotation = direction.angle()
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var displacement := travel_velocity * delta
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var step := displacement.length()
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var previous_position := global_position
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var next_position := previous_position + displacement
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var query := PhysicsRayQueryParameters2D.create(
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previous_position,
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next_position,
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collision_mask,
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[get_rid()]
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)
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var result := get_world_2d().direct_space_state.intersect_ray(query)
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if not result.is_empty():
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global_position = result["position"]
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_hit_target(result.get("collider"))
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return
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global_position = next_position
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_distance_travelled += step
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if _distance_travelled >= max_range and not _has_locked_target:
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queue_free()
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func _process(delta: float) -> void:
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if weapon_kind == ItemDefinition.WeaponKind.GAMMA:
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_engine_time += delta
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queue_redraw()
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if weapon_kind == ItemDefinition.WeaponKind.MISSILE:
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_engine_time += delta
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_smoke_emission_timer += delta
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while _smoke_emission_timer >= 0.028:
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_smoke_emission_timer -= 0.028
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_spawn_smoke_puff()
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_update_smoke_puffs(delta)
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queue_redraw()
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func _spawn_smoke_puff() -> void:
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if _smoke_puffs.size() >= 64:
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return
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var side := Vector2(-direction.y, direction.x)
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_smoke_puffs.append({
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"position": global_position - direction * 8.0,
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"velocity": direction * projectile_speed * 0.12 + side * randf_range(-9.0, 9.0),
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"age": 0.0,
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"life": randf_range(0.45, 0.75),
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"size": randf_range(3.0, 5.0),
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})
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func _update_smoke_puffs(delta: float) -> void:
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for puff_index in range(_smoke_puffs.size() - 1, -1, -1):
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var puff := _smoke_puffs[puff_index]
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puff["position"] = puff["position"] + puff["velocity"] * delta
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puff["age"] = float(puff["age"]) + delta
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_smoke_puffs[puff_index] = puff
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if float(puff["age"]) >= float(puff["life"]):
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_smoke_puffs.remove_at(puff_index)
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func _find_enemy_in_acquisition_range() -> Node2D:
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var nearest_enemy: Node2D
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var nearest_distance_squared := target_acquisition_range * target_acquisition_range
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if enemy_shot:
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return null
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for candidate in get_tree().get_nodes_in_group("enemies"):
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if not candidate is Node2D or candidate.is_queued_for_deletion():
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continue
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var distance_squared := global_position.distance_squared_to(candidate.global_position)
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if distance_squared <= nearest_distance_squared:
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nearest_distance_squared = distance_squared
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nearest_enemy = candidate
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return nearest_enemy
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func _draw() -> void:
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if weapon_kind == ItemDefinition.WeaponKind.MISSILE:
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_draw_missile_smoke()
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match weapon_kind:
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ItemDefinition.WeaponKind.GAMMA:
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var radius := 9.0 + sin(_engine_time * 9.0) * 2.0
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draw_circle(Vector2.ZERO, radius * 1.8, Color(0.3, 1.0, 0.1, 0.15))
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draw_circle(Vector2.ZERO, radius, Color(0.35, 0.95, 0.15, 0.8))
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draw_circle(Vector2.ZERO, radius * 0.5, Color(0.86, 1.0, 0.6))
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for index in 8:
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var angle := _engine_time * 5.0 + index * TAU / 8.0
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var orbit := Vector2(cos(angle), sin(angle) * 0.65) * (radius + 6.0)
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draw_circle(orbit, 2.0, Color(0.7, 1.0, 0.4))
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ItemDefinition.WeaponKind.PLASMA:
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var texture_size := PLASMA_TEXTURE.get_size() * (PLASMA_VISUAL_WIDTH / PLASMA_TEXTURE.get_width())
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# The source image points left; projectiles travel along their local +X.
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draw_set_transform(Vector2.ZERO, PI)
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draw_texture_rect(PLASMA_TEXTURE, Rect2(-texture_size * 0.5, texture_size), false)
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draw_set_transform(Vector2.ZERO)
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ItemDefinition.WeaponKind.MACHINE_GUN:
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# Tapered tracer, warm halo and a bright metallic projectile core.
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for index in 6:
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var tail_distance := 5.0 + index * 4.0
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if tail_distance >= _distance_travelled:
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break
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var fade := 1.0 - float(index) / 6.0
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var tip := Vector2(-tail_distance, 0)
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var tail := Vector2(-minf(tail_distance + 4.0, _distance_travelled), 0)
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draw_line(tail, tip, Color(1.0, 0.48, 0.1, fade * 0.55), 1.8 * fade, true)
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draw_line(Vector2(-9, 0), Vector2(6, 0), Color(1.0, 0.56, 0.12, 0.18), 7, true)
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draw_line(Vector2(-7, 0), Vector2(6, 0), Color(1.0, 0.8, 0.3), 2.5, true)
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draw_line(Vector2(-3, 0), Vector2(7, 0), Color(1.0, 0.98, 0.84), 1.2, true)
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draw_circle(Vector2(6, 0), 1.5, Color(1.0, 0.94, 0.65))
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ItemDefinition.WeaponKind.MISSILE:
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_draw_missile()
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func _draw_missile_smoke() -> void:
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for puff in _smoke_puffs:
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var progress := clampf(float(puff["age"]) / float(puff["life"]), 0.0, 1.0)
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var fade := 1.0 - progress
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var puff_position: Vector2 = to_local(puff["position"])
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var puff_size := float(puff["size"]) * (0.8 + progress * 0.75)
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draw_circle(puff_position, puff_size, Color(0.46, 0.58, 0.67, fade * 0.2))
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draw_circle(puff_position, puff_size * 0.48, Color(0.67, 0.75, 0.8, fade * 0.12))
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func _draw_missile() -> void:
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var flicker := sin(_engine_time * 37.0) * 2.0 + sin(_engine_time * 23.0) * 1.0
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var flame_tip := -23.0 - flicker
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# Narrow, layered exhaust behind the missile.
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draw_line(Vector2(-10, 0), Vector2(flame_tip, 0), Color(1.0, 0.25, 0.045, 0.72), 4.2, true)
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draw_line(Vector2(-10, 0), Vector2(flame_tip * 0.72, 0), Color(1.0, 0.72, 0.18, 0.94), 2.4, true)
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draw_line(Vector2(-10, 0), Vector2(flame_tip * 0.42, 0), Color(0.9, 0.98, 1.0, 1.0), 1.1, true)
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# Rear fins, long cylindrical casing, and a pointed nose; +X is forward.
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var fin_color := Color(0.48, 0.13, 0.11, 1.0)
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draw_line(Vector2(-7, -1.7), Vector2(-12, -5.0), fin_color, 1.8, true)
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draw_line(Vector2(-12, -5.0), Vector2(-10, -1.4), fin_color, 1.8, true)
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draw_line(Vector2(-7, 1.7), Vector2(-12, 5.0), fin_color, 1.8, true)
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draw_line(Vector2(-12, 5.0), Vector2(-10, 1.4), fin_color, 1.8, true)
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draw_line(Vector2(-8, -1.8), Vector2(6, -1.8), Color(0.25, 0.31, 0.35, 1.0), 3.8, true)
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draw_line(Vector2(-8, 0), Vector2(7, 0), Color(0.78, 0.83, 0.86, 1.0), 3.0, true)
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draw_line(Vector2(-8, 1.8), Vector2(6, 1.8), Color(0.38, 0.45, 0.49, 1.0), 1.2, true)
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draw_line(Vector2(-5, -1.35), Vector2(3, -1.35), Color(0.97, 0.98, 0.99, 0.9), 0.7, true)
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# Guidance band and seeker dome add small material details.
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draw_line(Vector2(3.0, -1.8), Vector2(3.0, 1.8), Color(0.84, 0.27, 0.16, 1.0), 1.3, true)
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draw_line(Vector2(6, -1.6), Vector2(10, 0), Color(0.66, 0.72, 0.75, 1.0), 2.4, true)
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draw_line(Vector2(10, 0), Vector2(6, 1.6), Color(0.66, 0.72, 0.75, 1.0), 2.4, true)
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draw_circle(Vector2(4.7, 0), 0.85, Color(0.44, 0.82, 0.95, 1.0))
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func _on_body_entered(body: Node2D) -> void:
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_hit_target(body)
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func _on_area_entered(area: Area2D) -> void:
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_hit_target(area)
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func _hit_target(target: Node) -> void:
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if _impact_handled:
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return
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_impact_handled = true
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var is_explosion := weapon_kind == ItemDefinition.WeaponKind.MISSILE
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_spawn_impact_effect(is_explosion)
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if enemy_shot and target.is_in_group("asteroids"):
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queue_free()
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return
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if weapon_kind == ItemDefinition.WeaponKind.MISSILE:
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_explode_at_target(target)
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else:
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_apply_damage_once(target)
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queue_free()
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func _spawn_impact_effect(is_explosion: bool) -> void:
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var effect := IMPACT_EFFECT_SCENE.instantiate() as Node2D
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effect.global_position = global_position
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get_parent().add_child(effect)
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var effect_color := Color(1.0, 0.48, 0.22) if is_explosion else Color(1.0, 0.78, 0.38)
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if weapon_kind == ItemDefinition.WeaponKind.GAMMA:
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effect_color = Color(0.4, 1.0, 0.15)
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is_explosion = true
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effect.call("configure", is_explosion, effect_color)
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func _explode_at_target(impact_target: Node) -> void:
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_apply_damage_once(impact_target)
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var explosion_shape := CircleShape2D.new()
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explosion_shape.radius = 120.0
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var query := PhysicsShapeQueryParameters2D.new()
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query.shape = explosion_shape
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query.transform = Transform2D(0.0, global_position)
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# Converted ships fire at hostiles; hostile blasts can also hit converted ships.
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var converted_shot := enemy_shot and (collision_mask & 4) != 0
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query.collision_mask = 4 if converted_shot or not enemy_shot else 66
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for result in get_world_2d().direct_space_state.intersect_shape(query, 32):
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_apply_damage_once(result.get("collider"))
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func _apply_damage_once(target: Variant) -> void:
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if not (target is Node):
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return
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if enemy_shot and target.is_in_group("asteroids"):
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return
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var instance_id: int = target.get_instance_id()
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if _already_hit.has(instance_id):
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return
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_already_hit[instance_id] = true
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if enemy_shot and target is CharacterBody2D and target.has_method("take_damage"):
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target.call("take_damage", damage, is_critical, DamageTypes.for_weapon(weapon_kind))
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elif target.has_method("take_weapon_hit"):
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target.call("take_weapon_hit", damage, is_critical, DamageTypes.for_weapon(weapon_kind))
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elif target.has_method("take_damage"):
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if target is CharacterBody2D:
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target.call("take_damage", damage, is_critical, DamageTypes.for_weapon(weapon_kind))
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else:
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target.call("take_damage", damage)
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if weapon_kind == ItemDefinition.WeaponKind.GAMMA:
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preload("res://scripts/game/radiation_status.gd").apply(target, damage * 0.25, not enemy_shot)
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