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Pixelorama/src/UI/Canvas/CanvasCamera.gd

252 lines
8.1 KiB
GDScript

class_name CanvasCamera
extends Node2D
signal zoom_changed
signal rotation_changed
signal offset_changed
enum Cameras { MAIN, SECOND, SMALL }
const CAMERA_SPEED_RATE := 15.0
@export var index := 0
var zoom := Vector2.ONE:
set(value):
zoom = value
Global.current_project.cameras_zoom[index] = zoom
zoom_changed.emit()
_update_viewport_transform()
var camera_angle := 0.0:
set(value):
camera_angle = wrapf(value, -PI, PI)
camera_angle_degrees = rad_to_deg(camera_angle)
Global.current_project.cameras_rotation[index] = camera_angle
rotation_changed.emit()
_update_viewport_transform()
var camera_angle_degrees := 0.0
var offset := Vector2.ZERO:
set(value):
offset = value
Global.current_project.cameras_offset[index] = offset
offset_changed.emit()
_update_viewport_transform()
var camera_screen_center := Vector2.ZERO
var zoom_in_max := Vector2(500, 500)
var zoom_out_max := Vector2(0.01, 0.01)
var viewport_container: SubViewportContainer
var transparent_checker: ColorRect
var mouse_pos := Vector2.ZERO
var drag := false
var rotation_slider: ValueSlider
var zoom_slider: ValueSlider
var should_tween := true
@onready var viewport := get_viewport()
func _ready() -> void:
viewport.size_changed.connect(_update_viewport_transform)
Global.project_switched.connect(_project_switched)
if not DisplayServer.is_touchscreen_available():
set_process_input(false)
if index == Cameras.MAIN:
rotation_slider = Global.top_menu_container.get_node("%RotationSlider")
rotation_slider.value_changed.connect(_rotation_slider_value_changed)
zoom_slider = Global.top_menu_container.get_node("%ZoomSlider")
zoom_slider.value_changed.connect(_zoom_slider_value_changed)
zoom_changed.connect(_zoom_changed)
rotation_changed.connect(_rotation_changed)
viewport_container = get_viewport().get_parent()
transparent_checker = get_viewport().get_node("TransparentChecker")
update_transparent_checker_offset()
func _input(event: InputEvent) -> void:
get_window().gui_release_focus()
if !Global.can_draw:
drag = false
return
mouse_pos = viewport_container.get_local_mouse_position()
if event.is_action_pressed(&"pan"):
drag = true
elif event.is_action_released(&"pan"):
drag = false
elif event.is_action_pressed(&"zoom_in", false, true): # Wheel Up Event
zoom_camera(1)
elif event.is_action_pressed(&"zoom_out", false, true): # Wheel Down Event
zoom_camera(-1)
elif event is InputEventMagnifyGesture: # Zoom gesture on touchscreens
#zoom_camera(event.factor)
if event.factor >= 1.0: # Zoom in
zoom_camera(event.factor * 0.3)
else: # Zoom out
zoom_camera((event.factor * 0.7) - 1.0)
elif event is InputEventPanGesture:
# Pan gesture on touchscreens
offset = offset + event.delta.rotated(camera_angle) * 2.0 / zoom
elif event is InputEventMouseMotion:
if drag:
offset = offset - event.relative.rotated(camera_angle) / zoom
update_transparent_checker_offset()
else:
var dir := Input.get_vector(&"camera_left", &"camera_right", &"camera_up", &"camera_down")
if dir != Vector2.ZERO and !_has_selection_tool():
offset = offset + (dir.rotated(camera_angle) / zoom) * CAMERA_SPEED_RATE
func zoom_camera(dir: float) -> void:
var viewport_size := viewport_container.size
if Global.smooth_zoom:
var zoom_margin := zoom * dir / 5
var new_zoom := zoom + zoom_margin
if Global.integer_zoom:
new_zoom = (zoom + Vector2.ONE * dir).floor()
if new_zoom < zoom_in_max && new_zoom > zoom_out_max:
var new_offset := (
offset
+ (
(-0.5 * viewport_size + mouse_pos).rotated(camera_angle)
* (Vector2.ONE / zoom - Vector2.ONE / new_zoom)
)
)
var tween := create_tween().set_parallel()
tween.set_trans(Tween.TRANS_LINEAR).set_ease(Tween.EASE_IN)
tween.tween_property(self, "zoom", new_zoom, 0.05)
tween.tween_property(self, "offset", new_offset, 0.05)
else:
var prev_zoom := zoom
var zoom_margin := zoom * dir / 10
if Global.integer_zoom:
zoom_margin = (Vector2.ONE * dir).floor()
if zoom + zoom_margin <= zoom_in_max:
zoom += zoom_margin
if zoom < zoom_out_max:
if Global.integer_zoom:
zoom = Vector2.ONE
else:
zoom = zoom_out_max
offset = (
offset
+ (
(-0.5 * viewport_size + mouse_pos).rotated(camera_angle)
* (Vector2.ONE / prev_zoom - Vector2.ONE / zoom)
)
)
func zoom_100() -> void:
zoom = Vector2.ONE
offset = Global.current_project.size / 2
func fit_to_frame(size: Vector2) -> void:
viewport_container = get_viewport().get_parent()
var h_ratio := viewport_container.size.x / size.x
var v_ratio := viewport_container.size.y / size.y
var ratio := minf(h_ratio, v_ratio)
if ratio == 0 or !viewport_container.visible:
return
# Temporarily disable integer zoom.
var reset_integer_zoom := Global.integer_zoom
if reset_integer_zoom:
Global.integer_zoom = !Global.integer_zoom
offset = size / 2
# Adjust to the rotated size:
if camera_angle != 0.0:
# Calculating the rotated corners of the frame to find its rotated size.
var a := Vector2.ZERO # Top left
var b := Vector2(size.x, 0).rotated(camera_angle) # Top right.
var c := Vector2(0, size.y).rotated(camera_angle) # Bottom left.
var d := Vector2(size.x, size.y).rotated(camera_angle) # Bottom right.
# Find how far apart each opposite point is on each axis, and take the longer one.
size.x = maxf(absf(a.x - d.x), absf(b.x - c.x))
size.y = maxf(absf(a.y - d.y), absf(b.y - c.y))
ratio = clampf(ratio, 0.1, ratio)
zoom = Vector2(ratio, ratio)
if reset_integer_zoom:
Global.integer_zoom = !Global.integer_zoom
func update_transparent_checker_offset() -> void:
var o := get_global_transform_with_canvas().get_origin()
var s := get_global_transform_with_canvas().get_scale()
o.y = get_viewport_rect().size.y - o.y
transparent_checker.update_offset(o, s)
## Updates the viewport's canvas transform, which is the area of the canvas that is
## currently visible. Called every time the camera's zoom, rotation or origin changes.
func _update_viewport_transform() -> void:
if not is_instance_valid(viewport):
return
var zoom_scale := Vector2.ONE / zoom
var viewport_size := get_viewport_rect().size
var screen_offset := viewport_size * 0.5 * zoom_scale
screen_offset = screen_offset.rotated(camera_angle)
var screen_rect := Rect2(-screen_offset, viewport_size * zoom_scale)
screen_rect.position += offset
var xform := Transform2D(camera_angle, zoom_scale, 0, screen_rect.position)
camera_screen_center = xform * (viewport_size * 0.5)
viewport.canvas_transform = xform.affine_inverse()
func _zoom_changed() -> void:
update_transparent_checker_offset()
if index == Cameras.MAIN:
should_tween = false
zoom_slider.value = zoom.x * 100.0
should_tween = true
for guide in Global.current_project.guides:
guide.width = 1.0 / zoom.x * 2
func _rotation_changed() -> void:
if index == Cameras.MAIN:
# Negative to make going up in value clockwise, and match the spinbox which does the same
rotation_slider.value = -camera_angle_degrees
func _zoom_slider_value_changed(value: float) -> void:
if value <= 0:
value = 1
var new_zoom := Vector2(value, value) / 100.0
if zoom.is_equal_approx(new_zoom):
return
if Global.smooth_zoom and should_tween:
var tween := create_tween().set_trans(Tween.TRANS_LINEAR).set_ease(Tween.EASE_IN)
tween.tween_property(self, "zoom", new_zoom, 0.05)
else:
zoom = new_zoom
func _rotation_slider_value_changed(value: float) -> void:
# Negative makes going up rotate clockwise
var angle := deg_to_rad(-value)
var difference := angle - camera_angle
var canvas_center: Vector2 = Global.current_project.size / 2
offset = (offset - canvas_center).rotated(difference) + canvas_center
camera_angle = angle
func _has_selection_tool() -> bool:
for slot in Tools._slots.values():
if slot.tool_node is BaseSelectionTool:
return true
return false
func _project_switched() -> void:
offset = Global.current_project.cameras_offset[index]
camera_angle = Global.current_project.cameras_rotation[index]
zoom = Global.current_project.cameras_zoom[index]
func _rotate_camera_around_point(degrees: float, point: Vector2) -> void:
var angle := deg_to_rad(degrees)
offset = (offset - point).rotated(angle) + point
camera_angle = camera_angle + angle