Merged "Scripts" and "Prefabs" folders into "src"

Made a new "src" folder that will contain the source code files, like all the GDScript and scene files. Please read this for more details: https://www.gdquest.com/docs/guidelines/best-practices/godot-gdscript/

It made no sense to keep scenes separate from their scripts. More file organizing will follow soon.

src/Rulers/VerticalRuler.gd

@@ -0,0 +1,71 @@
+extends Button
+
+const RULER_WIDTH := 16
+
+var font := preload("res://Assets/Fonts/Roboto-Small.tres")
+var major_subdivision := 2
+var minor_subdivision := 4
+
+var first : Vector2
+var last : Vector2
+
+
+func _ready() -> void:
+	Global.main_viewport.connect("item_rect_changed", self, "update")
+
+
+# Code taken and modified from Godot's source code
+func _draw() -> void:
+	var transform := Transform2D()
+	var ruler_transform := Transform2D()
+	var major_subdivide := Transform2D()
+	var minor_subdivide := Transform2D()
+	var zoom: float = 1 / Global.camera.zoom.x
+	transform.y = Vector2(zoom, zoom)
+
+	transform.origin = Global.main_viewport.rect_size / 2 + Global.camera.offset * -zoom
+
+	var basic_rule := 100.0
+	var i := 0
+	while(basic_rule * zoom > 100):
+		basic_rule /= 5.0 if i % 2 else 2.0
+		i += 1
+	i = 0
+	while(basic_rule * zoom < 100):
+		basic_rule *= 2.0 if i % 2 else 5.0
+		i += 1
+
+	ruler_transform = ruler_transform.scaled(Vector2(basic_rule, basic_rule))
+
+	major_subdivide = major_subdivide.scaled(Vector2(1.0 / major_subdivision, 1.0 / major_subdivision))
+	minor_subdivide = minor_subdivide.scaled(Vector2(1.0 / minor_subdivision, 1.0 / minor_subdivision))
+
+	first = (transform * ruler_transform * major_subdivide * minor_subdivide).affine_inverse().xform(Vector2.ZERO)
+	last = (transform * ruler_transform * major_subdivide * minor_subdivide).affine_inverse().xform(Global.main_viewport.rect_size)
+
+	for i in range(ceil(first.y), ceil(last.y)):
+		var position : Vector2 = (transform * ruler_transform * major_subdivide * minor_subdivide).xform(Vector2(0, i))
+		if i % (major_subdivision * minor_subdivision) == 0:
+			draw_line(Vector2(0, position.y), Vector2(RULER_WIDTH, position.y), Color.white)
+			var text_xform = Transform2D(-PI / 2, Vector2(font.get_height() - 4, position.y - 2))
+			draw_set_transform_matrix(get_transform() * text_xform)
+			var val = (ruler_transform * major_subdivide * minor_subdivide).xform(Vector2(0, i)).y
+			draw_string(font, Vector2(), str(int(val)))
+			draw_set_transform_matrix(get_transform())
+		else:
+			if i % minor_subdivision == 0:
+				draw_line(Vector2(RULER_WIDTH * 0.33, position.y), Vector2(RULER_WIDTH, position.y), Color.white)
+			else:
+				draw_line(Vector2(RULER_WIDTH * 0.66, position.y), Vector2(RULER_WIDTH, position.y), Color.white)
+
+
+func _on_VerticalRuler_pressed() -> void:
+	if !Global.show_guides:
+		return
+	var guide := Guide.new()
+	guide.type = guide.Types.VERTICAL
+	guide.add_point(Vector2(Global.canvas.current_pixel.x, -99999))
+	guide.add_point(Vector2(Global.canvas.current_pixel.x, 99999))
+	Global.canvas.add_child(guide)
+	Global.has_focus = false
+	update()