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Add "Chase" unit action, and make enemies use it to chase citizens.

This commit is contained in:
Nekojimi 2025-05-12 11:19:52 +01:00
parent 0350d48957
commit 3fa58bc6df
2 changed files with 48 additions and 1 deletions
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41
scripts/units/action.gd
View File

@ -53,6 +53,47 @@ class MoveAction extends UnitAction:
#DebugDraw3D.draw_text(global_position + Vector3(0,1,0), "%f" % nav_agent_3d.distance_to_target())
return Unit.TaskStatus.IN_PROGRESS
class ChaseAction extends UnitAction:
var target: Unit
var target_position: Vector3
var last_distance_to_target: float = 99999999.9
var stuck_timer: float = 0.0
func process(delta: float) -> Unit.TaskStatus:
if target == null or target.is_queued_for_deletion():
return Unit.TaskStatus.IMPOSSIBLE
if target.global_position.distance_squared_to(target_position) >= 4.0:
# TODO: we could try to intercept the target by:
# - calculating our approximate time to reach the target
# - forcasting the target's position that time in the future based on it's velocity
# - do a raycast in that direction to prevent the future position from going through a wall
target_position = target.global_position
unit.nav_agent_3d.target_position = target_position
if unit.nav_agent_3d.is_navigation_finished():
if unit.nav_agent_3d.is_target_reachable():
return Unit.TaskStatus.DONE
else:
return Unit.TaskStatus.IMPOSSIBLE
else:
var next_point: Vector3 = unit.nav_agent_3d.get_next_path_position()
if unit.shapecast_3d.is_colliding():
var distance_to_target: float = unit.global_position.distance_to(next_point)
var progress_rate: float = (last_distance_to_target - distance_to_target) / delta
last_distance_to_target = distance_to_target
if progress_rate < unit.minimum_progress_rate:
stuck_timer += delta
if stuck_timer >= unit.stuck_time:
unit.unstuck()
else:
unit.label_3d.modulate = Color.WHITE
stuck_timer = 0
DebugDraw3D.draw_sphere(unit.nav_agent_3d.target_position, 0.5, Color.RED)
var direction: Vector3 = (next_point - unit.global_position).normalized()
unit.target_velocity = direction * unit.max_speed
unit.nav_agent_3d.velocity = unit.target_velocity
return Unit.TaskStatus.IN_PROGRESS
class BuildAction extends UnitAction:
var building: Building

8
scripts/units/enemy.gd
View File

@ -8,4 +8,10 @@ var sighted: bool = true:
func _ready() -> void:
sighted = false
go_to_destination(Vector3(17,1,15))
var target_citizen: Citizen = get_tree().get_nodes_in_group("Citizens").pick_random() as Citizen
if target_citizen != null:
var chase_action: UnitAction.ChaseAction = UnitAction.ChaseAction.new()
chase_action.unit = self
chase_action.target = target_citizen
action = chase_action
#go_to_destination(Vector3(17,1,15))