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addons/zylann.hterrain/tools/minimap/ratio_container.gd

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+# Simple container keeping its children under the same aspect ratio
+
+@tool
+extends Container
+
+
+@export var ratio := 1.0
+
+
+func _notification(what: int):
+	if what == NOTIFICATION_SORT_CHILDREN:
+		_sort_children2()
+
+
+# TODO Function with ugly name to workaround a Godot 3.1 issue
+# See https://github.com/godotengine/godot/pull/38396
+func _sort_children2():
+	for i in get_child_count():
+		var child = get_child(i)
+		if not (child is Control):
+			continue
+		var w := size.x
+		var h := size.x / ratio
+		
+		if h > size.y:
+			h = size.y
+			w = h * ratio
+
+		var rect := Rect2(0, 0, w, h)
+		
+		fit_child_in_rect(child, rect)
+