WIP: timeline drawing, still buggy

Scripts/Timeline.gd

@@ -0,0 +1,71 @@
+@tool
+class_name Timeline
+extends Control
+
+@export var font_scale: float = 1.0
+@export var time_offset: float = 0.0
+@export var grid_space_seconds: float = 0.25
+@export var label_interval_seconds: float = 1.0
+@export var line_thickness: int = 1
+@export var primary_line_step: int = 4
+@export var cursor_width: int = 8
+@export var base_scale: float = 2.0
+@export var zoom: float = 1.0
+
+@export var min_zoom: float = 0.1
+
+func _draw():
+	draw_intervals()
+	# draw_top_time_labels()
+	pass
+
+func _gui_input(event):
+	var zoom_factor = 1.1
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_WHEEL_DOWN:
+		zoom /= zoom_factor
+		queue_redraw()
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_WHEEL_UP:
+		zoom *= zoom_factor
+		queue_redraw()
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_WHEEL_LEFT:
+		time_offset -= 0.1 / zoom
+		queue_redraw()
+	if event is InputEventMouseButton and event.button_index == MOUSE_BUTTON_WHEEL_RIGHT:
+		time_offset += 0.1 / zoom
+		queue_redraw()
+
+	zoom = max(min_zoom, zoom)
+	time_offset = max(0.0, time_offset)
+
+func draw_intervals():
+	var font = get_theme_default_font()
+	var font_size = get_theme_default_font_size()
+
+	var current_width = size.x
+	var current_height = size.y
+
+	var primary_color = get_theme_color("line_primary_color", "Timeline")
+	var secondary_color = get_theme_color("line_secondary_color", "Timeline")
+
+	var interval = grid_space_seconds * base_scale * zoom * current_width
+
+	var first_line_index = roundi(time_offset / grid_space_seconds)
+	var first_line_position = -(time_offset - (first_line_index * grid_space_seconds)) * interval
+
+	var line_count = ceil(current_width / interval) + 4
+
+	var current_position = first_line_position
+
+	for i in range(first_line_index, first_line_index + line_count):
+		if current_position > current_width:
+			break
+
+		if current_position >= -interval:
+			var color = secondary_color
+			if i % primary_line_step == 0:
+				draw_string(font, Vector2(current_position, 0), str(i * grid_space_seconds), HORIZONTAL_ALIGNMENT_CENTER, -1, font_size * font_scale)
+				color = primary_color
+
+			draw_line(Vector2(current_position, 0), Vector2(current_position, current_height), color, line_thickness)
+
+		current_position += interval