You can now resize cels in the timeline by holding Control and scrolling with the mouse wheel.

Addresses part of #306

src/Classes/Project.gd

@@ -127,7 +127,7 @@ func change_project() -> void:
 
 	for j in range(frames.size()): # Create frame ID labels
 		var label := Label.new()
-		label.rect_min_size.x = 36
+		label.rect_min_size.x = Global.animation_timeline.cel_size
 		label.align = Label.ALIGN_CENTER
 		label.text = str(j + 1)
 		if j == current_frame:
@@ -383,7 +383,7 @@ func frames_changed(value : Array) -> void:
 
 	for j in range(frames.size()):
 		var label := Label.new()
-		label.rect_min_size.x = 36
+		label.rect_min_size.x = Global.animation_timeline.cel_size
 		label.align = Label.ALIGN_CENTER
 		label.text = str(j + 1)
 		Global.frame_ids.add_child(label)
@@ -532,18 +532,19 @@ func animation_tags_changed(value : Array) -> void:
 		child.queue_free()
 
 	for tag in animation_tags:
-		var tag_c : Container = load("res://src/UI/Timeline/AnimationTag.tscn").instance()
+		var tag_base_size = Global.animation_timeline.cel_size + 3
+		var tag_c : Container = load("res://src/UI/Timeline/AnimationTagUI.tscn").instance()
 		Global.tag_container.add_child(tag_c)
+		tag_c.tag = tag
 		var tag_position : int = Global.tag_container.get_child_count() - 1
 		Global.tag_container.move_child(tag_c, tag_position)
 		tag_c.get_node("Label").text = tag.name
 		tag_c.get_node("Label").modulate = tag.color
 		tag_c.get_node("Line2D").default_color = tag.color
 
-		tag_c.rect_position.x = (tag.from - 1) * 39 + tag.from
-
+		tag_c.rect_position.x = (tag.from - 1) * tag_base_size + tag.from
 		var tag_size : int = tag.to - tag.from
-		tag_c.rect_min_size.x = (tag_size + 1) * 39
+		tag_c.rect_min_size.x = (tag_size + 1) * tag_base_size
 		tag_c.get_node("Line2D").points[2] = Vector2(tag_c.rect_min_size.x, 0)
 		tag_c.get_node("Line2D").points[3] = Vector2(tag_c.rect_min_size.x, 32)
 

src/UI/Timeline/AnimationTagUI.gd

@@ -0,0 +1,4 @@
+extends VBoxContainer
+
+
+var tag : AnimationTag

src/UI/Timeline/AnimationTagUI.tscn

@@ -1,9 +1,12 @@
-[gd_scene format=2]
+[gd_scene load_steps=2 format=2]
 
-[node name="AnimationTag" type="VBoxContainer"]
+[ext_resource path="res://src/UI/Timeline/AnimationTagUI.gd" type="Script" id=1]
+
+[node name="AnimationTagUI" type="VBoxContainer"]
 margin_right = 39.0
 margin_bottom = 32.0
 rect_min_size = Vector2( 39, 32 )
+script = ExtResource( 1 )
 __meta__ = {
 "_edit_use_anchors_": false
 }
@@ -11,7 +14,6 @@ __meta__ = {
 [node name="Line2D" type="Line2D" parent="."]
 points = PoolVector2Array( 0, 32, 0, 0, 39, 0, 39, 32 )
 width = 1.0
-texture_mode = 1313163520
 
 [node name="Label" type="Label" parent="."]
 margin_left = 7.0

src/UI/Timeline/AnimationTimeline.gd

@@ -4,6 +4,10 @@ var animation_loop := 1 # 0 is no loop, 1 is cycle loop, 2 is ping-pong loop
 var animation_forward := true
 var first_frame := 0
 var last_frame := 0
+var is_mouse_hover := false
+var cel_size := 36 setget cel_size_changed
+var min_cel_size := 36
+var max_cel_size := 144
 
 var timeline_scroll : ScrollContainer
 var tag_scroll_container : ScrollContainer
@@ -20,12 +24,47 @@ func _ready() -> void:
 	fps_spinbox.value = Global.current_project.fps
 
 
+func _input(event : InputEvent) -> void:
+	var mouse_pos := get_global_mouse_position()
+	var timeline_rect := Rect2(rect_global_position, rect_size)
+	if timeline_rect.has_point(mouse_pos):
+		if Input.is_key_pressed(KEY_CONTROL):
+			self.cel_size += (2 * int(event.is_action("zoom_in")) - 2 * int(event.is_action("zoom_out")))
+
+
 func _h_scroll_changed(value : float) -> void:
 	# Let the main timeline ScrollContainer affect the tag ScrollContainer too
 	tag_scroll_container.get_child(0).rect_min_size.x = timeline_scroll.get_child(0).rect_size.x - 212
 	tag_scroll_container.scroll_horizontal = value
 
 
+func cel_size_changed(value : int) -> void:
+	cel_size = clamp(value, min_cel_size, max_cel_size)
+	for layer_button in Global.layers_container.get_children():
+		layer_button.rect_min_size.y = cel_size
+		layer_button.rect_size.y = cel_size
+	for layer in Global.current_project.layers:
+		for cel_button in layer.frame_container.get_children():
+			cel_button.rect_min_size.x = cel_size
+			cel_button.rect_min_size.y = cel_size
+			cel_button.rect_size.x = cel_size
+			cel_button.rect_size.y = cel_size
+
+	for frame_id in Global.frame_ids.get_children():
+		frame_id.rect_min_size.x = cel_size
+		frame_id.rect_size.x = cel_size
+
+	for tag_c in Global.tag_container.get_children():
+		var tag_base_size = cel_size + 3
+		var tag : AnimationTag = tag_c.tag
+		tag_c.rect_position.x = (tag.from - 1) * tag_base_size + tag.from
+		var tag_size : int = tag.to - tag.from
+		tag_c.rect_min_size.x = (tag_size + 1) * tag_base_size
+		tag_c.rect_size.x = (tag_size + 1) * tag_base_size
+		tag_c.get_node("Line2D").points[2] = Vector2(tag_c.rect_min_size.x, 0)
+		tag_c.get_node("Line2D").points[3] = Vector2(tag_c.rect_min_size.x, 32)
+
+
 func add_frame() -> void:
 	var frame : Frame = Global.canvas.new_empty_frame()
 	var new_frames : Array = Global.current_project.frames.duplicate()
@@ -502,4 +541,3 @@ func _on_OpacitySlider_value_changed(value) -> void:
 
 func _on_OnionSkinningSettings_popup_hide() -> void:
 	Global.can_draw = true
-

src/UI/Timeline/CelButton.gd

@@ -7,6 +7,9 @@ onready var popup_menu : PopupMenu = $PopupMenu
 
 
 func _ready() -> void:
+	rect_min_size.x = Global.animation_timeline.cel_size
+	rect_min_size.y = Global.animation_timeline.cel_size
+
 	hint_tooltip = tr("Frame: %s, Layer: %s") % [frame + 1, layer]
 	if Global.current_project.frames[frame] in Global.current_project.layers[layer].linked_cels:
 		get_node("LinkedIndicator").visible = true
@@ -22,6 +25,16 @@ func _ready() -> void:
 	checker.rect_size = checker.get_parent().rect_size
 
 
+func _on_CelButton_resized() -> void:
+	get_node("CelTexture").rect_min_size.x = rect_min_size.x - 4
+	get_node("CelTexture").rect_min_size.y = rect_min_size.y - 4
+
+	get_node("LinkedIndicator").polygon[1].x = rect_min_size.x
+	get_node("LinkedIndicator").polygon[2].x = rect_min_size.x
+	get_node("LinkedIndicator").polygon[2].y = rect_min_size.y
+	get_node("LinkedIndicator").polygon[3].y = rect_min_size.y
+
+
 func _on_CelButton_pressed() -> void:
 	if Input.is_action_just_released("left_mouse"):
 		Global.current_project.current_frame = frame

src/UI/Timeline/CelButton.tscn

@@ -67,4 +67,5 @@ invert_enable = true
 invert_border = 1.0
 polygon = PoolVector2Array( 0, 0, 36, 0, 36, 36, 0, 36 )
 [connection signal="pressed" from="." to="." method="_on_CelButton_pressed"]
+[connection signal="resized" from="." to="." method="_on_CelButton_resized"]
 [connection signal="id_pressed" from="PopupMenu" to="." method="_on_PopupMenu_id_pressed"]

src/UI/Timeline/LayerButton.gd

@@ -11,6 +11,7 @@ var line_edit : LineEdit
 
 
 func _ready() -> void:
+	rect_min_size.y = Global.animation_timeline.cel_size
 	visibility_button = find_node("VisibilityButton")
 	lock_button = find_node("LockButton")
 	linked_button = find_node("LinkButton")