sijcdu
35174b67ab
The user did not want anything firing: the bullets should simply exist in the air as fixed obstacles. bullet_ring (the emitter) is deleted and bullet_field takes its place. bullet_field generates concentric rings of frozen bullets centred on itself, radii given in cells (default 5/10/15), and skips bullets that fall outside the level bounds or land inside solid tiles so nothing is buried in the terrain. Each bullet is a StaticBody2D on the world layer, so it blocks the player and can be stood on; damage defaults to 0 (pure obstacle) and can be raised to turn them into hazards.
127 lines
3.7 KiB
GDScript
127 lines
3.7 KiB
GDScript
extends Node2D
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## 静态弹幕障碍：以自己为圆心，一圈一圈地摆上**固定不动、不会发射**的子弹。
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## 默认只是纯障碍（实心，撞得到、能踩上去），把 damage 调大于 0 就变成碰到扣血。
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## 落在实心地砖里的子弹会自动跳过（不然会埋在地里）。
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const BULLET_SCRIPT := preload("res://scripts/bullet.gd")
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@export var enabled: bool = true
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## 每一圈的半径（单位：格）。默认 5 格、10 格、15 格
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@export var radii_cells: Array[int] = [5, 10, 15]
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## 每圈摆几颗
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@export var per_ring: int = 20
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## 一格多少像素（图块是 18）
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@export var cell_size: float = 18.0
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## 起始角度偏移（度），用来微调子弹摆在哪个方向
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@export var angle_offset_deg: float = 0.0
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## 子弹半径
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@export var bullet_radius: int = 3
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@export var bullet_color: Color = Color(1.0, 0.45, 0.85)
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## 实心障碍：玩家撞得到、也能踩上去
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@export var solid: bool = true
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## 碰到扣几颗心。0 = 只是障碍不扣血
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@export var damage: int = 0
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## 超出这个范围的子弹不生成（默认整个关卡 468x270）
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@export var bounds: Rect2 = Rect2(0, 0, 468, 270)
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## 最多铺几圈
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@export var max_rings: int = 3
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## 跳过埋在地砖里的子弹
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@export var skip_solid_ground: bool = true
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var made: int = 0
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var skipped_out: int = 0
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var skipped_ground: int = 0
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func _ready() -> void:
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if not enabled:
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return
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# 等一帧，确保 TileMapLayer 都已经就绪
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_build.call_deferred()
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func _build() -> void:
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var layers := _tile_layers()
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var tex := BULLET_SCRIPT.circle_texture(bullet_radius, bullet_color)
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made = 0
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skipped_out = 0
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skipped_ground = 0
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for i in mini(radii_cells.size(), max_rings):
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var radius: float = float(radii_cells[i]) * cell_size
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for k in per_ring:
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var ang := deg_to_rad(angle_offset_deg + 360.0 * float(k) / float(per_ring))
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var pos := global_position + Vector2(cos(ang), sin(ang)) * radius
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if not bounds.has_point(pos):
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skipped_out += 1
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continue
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if skip_solid_ground and _in_solid(layers, pos):
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skipped_ground += 1
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continue
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_make(pos, tex)
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made += 1
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func _tile_layers() -> Array:
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var root: Node = owner if owner != null else get_tree().current_scene
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if root == null:
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return []
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return root.find_children("*", "TileMapLayer", true, false)
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## 这个点是不是埋在实心地砖里
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func _in_solid(layers: Array, pos: Vector2) -> bool:
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for l in layers:
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var cell: Vector2i = l.local_to_map(l.to_local(pos))
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var sid: int = l.get_cell_source_id(cell)
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if sid == -1:
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continue
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var source := l.tile_set.get_source(sid) as TileSetAtlasSource
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if source == null:
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continue
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var data: TileData = source.get_tile_data(l.get_cell_atlas_coords(cell), 0)
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if data != null and data.get_collision_polygons_count(0) > 0:
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return true
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return false
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func _make(pos: Vector2, tex: Texture2D) -> void:
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var body := StaticBody2D.new()
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if solid:
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body.collision_layer = 1
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body.collision_mask = 1
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else:
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body.collision_layer = 0
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body.collision_mask = 0
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add_child(body)
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body.global_position = pos
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var sprite := Sprite2D.new()
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sprite.texture = tex
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sprite.texture_filter = CanvasItem.TEXTURE_FILTER_NEAREST
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body.add_child(sprite)
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if solid:
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var shape := CollisionShape2D.new()
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var circle := CircleShape2D.new()
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circle.radius = float(bullet_radius)
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shape.shape = circle
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body.add_child(shape)
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if damage > 0:
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var area := Area2D.new()
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area.collision_layer = 4
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area.collision_mask = 2
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var hit := CollisionShape2D.new()
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var circle2 := CircleShape2D.new()
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circle2.radius = float(bullet_radius) + 1.0
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hit.shape = circle2
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area.add_child(hit)
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body.add_child(area)
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area.body_entered.connect(_on_hit)
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func _on_hit(body: Node2D) -> void:
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if body.has_method("hurt"):
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body.hurt(damage)
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