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extends Node3D
signal province_selected(identifier : String)
signal map_view_camera_change(camera_position : Vector3)
const _action_north : StringName = &"map_north"
const _action_east : StringName = &"map_east"
const _action_south : StringName = &"map_south"
const _action_west : StringName = &"map_west"
const _action_zoomin : StringName = &"map_zoomin"
const _action_zoomout : StringName = &"map_zoomout"
const _action_drag : StringName = &"map_drag"
const _action_click : StringName = &"map_click"
const _shader_param_province_index : StringName = &"province_index_tex"
const _shader_param_province_colour : StringName = &"province_colour_tex"
const _shader_param_hover_pos : StringName = &"hover_pos"
const _shader_param_selected_pos : StringName = &"selected_pos"
@export var _camera : Camera3D
@export var _cardinal_move_speed : float = 1.0
@export var _edge_move_threshold: float = 0.15
@export var _edge_move_speed: float = 2.5
var _drag_anchor : Vector2
var _drag_active : bool = false
@export var _zoom_target_min : float = 0.2
@export var _zoom_target_max : float = 5.0
@export var _zoom_target_step : float = 0.1
@export var _zoom_epsilon : float = _zoom_target_step * 0.1
@export var _zoom_speed : float = 5.0
@export var _zoom_target : float = 1.0:
get: return _zoom_target
set(v): _zoom_target = clamp(v, _zoom_target_min, _zoom_target_max)
@export var _map_mesh_instance : MeshInstance3D
var _map_mesh : MapMesh
var _map_shader_material : ShaderMaterial
var _map_image_size : Vector2
var _map_province_index_image : Image
var _map_mesh_corner : Vector2
var _map_mesh_dims : Vector2
var _mouse_pos_viewport : Vector2 = Vector2(0.5, 0.5)
var _mouse_pos_map : Vector2 = Vector2(0.5, 0.5)
func _ready():
if _camera == null:
push_error("MapView's _camera variable hasn't been set!")
return
if _map_mesh_instance == null:
push_error("MapView's _map_mesh variable hasn't been set!")
return
if not _map_mesh_instance.mesh is MapMesh:
push_error("Invalid map mesh class: ", _map_mesh_instance.mesh.get_class(), "(expected MapMesh)")
return
_map_mesh = _map_mesh_instance.mesh
# Set map mesh size and get bounds
_map_image_size = Vector2(Vector2i(MapSingleton.get_width(), MapSingleton.get_height()))
_map_mesh.aspect_ratio = _map_image_size.x / _map_image_size.y
var map_mesh_aabb := _map_mesh.get_core_aabb() * _map_mesh_instance.transform
_map_mesh_corner = Vector2(
min(map_mesh_aabb.position.x, map_mesh_aabb.end.x),
min(map_mesh_aabb.position.z, map_mesh_aabb.end.z)
)
_map_mesh_dims = abs(Vector2(
map_mesh_aabb.position.x - map_mesh_aabb.end.x,
map_mesh_aabb.position.z - map_mesh_aabb.end.z
))
var map_material = _map_mesh_instance.get_active_material(0)
if map_material == null:
push_error("Map mesh is missing material!")
return
if not map_material is ShaderMaterial:
push_error("Invalid map mesh material class: ", map_material.get_class())
return
_map_shader_material = map_material
# Province index texture
_map_province_index_image = MapSingleton.get_province_index_image()
if _map_province_index_image == null:
push_error("Failed to get province index image!")
return
var province_index_texture := ImageTexture.create_from_image(_map_province_index_image)
_map_shader_material.set_shader_parameter(_shader_param_province_index, province_index_texture)
# Province colour texture
var province_colour_image = MapSingleton.get_province_colour_image()
if province_colour_image == null:
push_error("Failed to get province colour image!")
return
var province_colour_texture := ImageTexture.create_from_image(province_colour_image)
_map_shader_material.set_shader_parameter(_shader_param_province_colour, province_colour_texture)
func _unhandled_input(event : InputEvent):
if event.is_action_pressed(_action_click):
# Check if the mouse is outside of bounds
if _map_mesh.is_valid_uv_coord(_mouse_pos_map):
_map_shader_material.set_shader_parameter(_shader_param_selected_pos, _mouse_pos_map)
var mouse_pixel_pos := Vector2i(_mouse_pos_map * _map_image_size)
var province_identifier := MapSingleton.get_province_identifier_from_pixel_coords(mouse_pixel_pos)
province_selected.emit(province_identifier)
elif event.is_action_pressed(_action_drag):
if _drag_active:
push_warning("Drag being activated while already active!")
_drag_active = true
_drag_anchor = _mouse_pos_map
elif event.is_action_released(_action_drag):
if not _drag_active:
push_warning("Drag being deactivated while already not active!")
_drag_active = false
elif event.is_action_pressed(_action_zoomin, true):
_zoom_target -= _zoom_target_step
elif event.is_action_pressed(_action_zoomout, true):
_zoom_target += _zoom_target_step
func _physics_process(delta : float):
_mouse_pos_viewport = get_viewport().get_mouse_position()
# Process movement
_movement_process(delta)
# Keep within map bounds
_clamp_over_map()
# Process zooming
_zoom_process(delta)
# Orient based on height
map_view_camera_change.emit(_camera.position)
_update_orientation()
# Calculate where the mouse lies on the map
_update_mouse_map_position()
func _movement_process(delta : float) -> void:
var direction : Vector2
if _drag_active:
direction = (_drag_anchor - _mouse_pos_map) * _map_mesh_dims
else:
direction = _edge_scrolling_vector() + _cardinal_movement_vector()
# Scale movement speed with height
direction *= _camera.position.y * delta
_camera.position += Vector3(direction.x, 0, direction.y)
func _edge_scrolling_vector() -> Vector2:
var viewport_dims := Vector2(Resolution.get_current_resolution())
var mouse_vector := _mouse_pos_viewport / viewport_dims - Vector2(0.5, 0.5);
if pow(mouse_vector.x, 4) + pow(mouse_vector.y, 4) < pow(0.5 - _edge_move_threshold, 4):
mouse_vector *= 0
return mouse_vector * _edge_move_speed
func _cardinal_movement_vector() -> Vector2:
var move := Vector2(
float(Input.is_action_pressed(_action_east)) - float(Input.is_action_pressed(_action_west)),
float(Input.is_action_pressed(_action_south)) - float(Input.is_action_pressed(_action_north))
)
return move * _cardinal_move_speed
func _clamp_over_map() -> void:
_camera.position.x = _map_mesh_corner.x + fposmod(_camera.position.x - _map_mesh_corner.x, _map_mesh_dims.x)
_camera.position.z = clamp(_camera.position.z, _map_mesh_corner.y, _map_mesh_corner.y + _map_mesh_dims.y)
func _zoom_process(delta : float) -> void:
var height := _camera.position.y
var zoom := _zoom_target - height
height += zoom * _zoom_speed * delta
var new_zoom := _zoom_target - height
# Set to target if height is within _zoom_epsilon of it or has overshot past it
if abs(new_zoom) < _zoom_epsilon or sign(zoom) != sign(new_zoom):
height = _zoom_target
_camera.position.y = height
func _update_orientation() -> void:
var dir := Vector3(0, -1, -exp(-_camera.position.y * 2.0 + 0.5))
_camera.look_at(_camera.position + dir)
func _update_mouse_map_position() -> void:
var ray_origin := _camera.project_ray_origin(_mouse_pos_viewport)
var ray_normal := _camera.project_ray_normal(_mouse_pos_viewport)
# Plane with normal (0,1,0) facing upwards, at a distance 0 from the origin
var intersection = Plane(0, 1, 0, 0).intersects_ray(ray_origin, ray_normal)
if typeof(intersection) == TYPE_VECTOR3:
var intersection_vec := intersection as Vector3
# This loops both horizontally (good) and vertically (bad)
_mouse_pos_map = (Vector2(intersection_vec.x, intersection_vec.z) - _map_mesh_corner) / _map_mesh_dims
_map_shader_material.set_shader_parameter(_shader_param_hover_pos, _mouse_pos_map)
else:
# Normals parallel to the xz-plane could cause null intersections,
# but the camera's orientation should prevent such normals
push_error("Invalid intersection: ", intersection)
|
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