sijcdu
9dffacd938
Player: move/jump (Space), test flight (F, debug builds only). Key: pickup, hold S to aim with live trajectory preview, release to throw, W to warp to the thrown key. Spring bounce. Spikes deal damage. 3-heart health, Z consumes a heal item for +1 heart and a 5s shield. HUD with hearts and item count. Death screen with fade-to-black and restart. Hidden passages. Assets: Kenney Pixel Platformer (CC0).
126 lines
3.6 KiB
GDScript
126 lines
3.6 KiB
GDScript
extends Area2D
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signal collected
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## 钥匙中心到"脚底"的距离：射线从脚底出发，落地时钥匙正好站在表面上
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const FOOT_OFFSET := 7.0
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const STEP := 1.0 / 60.0
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const MAX_STEPS := 240
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enum State { IDLE, THROWN, LANDED }
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## 关卡里那把钥匙原本是用 TerrainBase 的一块地砖画的。
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## 这个开关让钥匙对象在开场时把脚下那块占位地砖擦掉，避免两个钥匙重叠。
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@export var erase_placeholder_on_ready: bool = true
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## 落地后多久才允许再次被捡起
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@export var settle_time: float = 0.4
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## 飞行时用哪几层做落地判定。玩家投掷时会把它设成玩家自己的 collision_mask，
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## 所以"钥匙能落在哪"严格等于"玩家能站在哪"。
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@export var flight_mask: int = 1
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var state: State = State.IDLE
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var velocity := Vector2.ZERO
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var _settle := 0.0
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func _ready() -> void:
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body_entered.connect(_on_body_entered)
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if erase_placeholder_on_ready:
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_erase_placeholder_tile()
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_start_idle()
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func _physics_process(_delta: float) -> void:
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if state == State.LANDED:
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_settle += STEP
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if _settle >= settle_time:
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_start_idle()
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return
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if state != State.THROWN:
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return
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var g := gravity()
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var motion := velocity * STEP
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var from := global_position + Vector2(0.0, FOOT_OFFSET)
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var query := PhysicsRayQueryParameters2D.create(from, from + motion, flight_mask)
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var hit := get_world_2d().direct_space_state.intersect_ray(query)
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if hit.is_empty():
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global_position += motion
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velocity.y += g * STEP
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else:
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global_position = hit["position"] - Vector2(0.0, FOOT_OFFSET)
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velocity = Vector2.ZERO
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state = State.LANDED
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_settle = 0.0
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# ---------------------------------------------------------------- 对外接口
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func launch(v: Vector2) -> void:
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velocity = v
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state = State.THROWN
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monitoring = false
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_settle = 0.0
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func _start_idle() -> void:
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state = State.IDLE
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velocity = Vector2.ZERO
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monitoring = true
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func _on_body_entered(body: Node2D) -> void:
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if state != State.IDLE:
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return
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if body.has_method("collect_key"):
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body.collect_key()
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collected.emit()
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queue_free()
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# ---------------------------------------------------------------- 轨迹模拟
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static func gravity() -> float:
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return float(ProjectSettings.get_setting("physics/2d/default_gravity", 980.0))
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## 和 _physics_process 里的推进方式完全一致，玩家用它来画预览弧线，
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## 所以预览落点和真正落点会重合。mask 就是玩家的碰撞掩码。
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static func simulate_trajectory(
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space: PhysicsDirectSpaceState2D,
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start: Vector2,
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vel: Vector2,
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mask: int,
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max_steps: int = MAX_STEPS) -> Dictionary:
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var points := PackedVector2Array()
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var p := start
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var v := vel
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var g := gravity()
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points.append(p)
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for i in max_steps:
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var next := p + v * STEP
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var query := PhysicsRayQueryParameters2D.create(
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p + Vector2(0.0, FOOT_OFFSET), next + Vector2(0.0, FOOT_OFFSET), mask)
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var hit := space.intersect_ray(query)
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if not hit.is_empty():
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var landing: Vector2 = hit["position"] - Vector2(0.0, FOOT_OFFSET)
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points.append(landing)
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return {"points": points, "landed": true, "landing": landing}
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p = next
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v.y += g * STEP
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points.append(p)
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return {"points": points, "landed": false, "landing": p}
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# ---------------------------------------------------------------- 清理占位地砖
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func _erase_placeholder_tile() -> void:
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var root: Node = owner if owner != null else get_parent()
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if root == null:
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return
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for layer in root.find_children("*", "TileMapLayer", true, false):
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var cell: Vector2i = layer.local_to_map(layer.to_local(global_position))
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if layer.get_cell_source_id(cell) != -1:
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layer.erase_cell(cell)
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