From 1e5709265c9052660da31076f6f43d103b4c4bf9 Mon Sep 17 00:00:00 2001
From: Matheus Lima Cunha <matheus.limacunha@hotmail.com>
Date: Mon, 15 Apr 2019 15:01:29 -0300
Subject: [PATCH] Move vertex along a single axis while editing and holding
 shift

(cherry picked from commit 0110a88547b87bcd066f1ae74f46b2ba8b7ab2a5)
---
 editor/plugins/abstract_polygon_2d_editor.cpp | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/editor/plugins/abstract_polygon_2d_editor.cpp b/editor/plugins/abstract_polygon_2d_editor.cpp
index 4a4e7f25b8a..1afd7df0497 100644
--- a/editor/plugins/abstract_polygon_2d_editor.cpp
+++ b/editor/plugins/abstract_polygon_2d_editor.cpp
@@ -481,6 +481,17 @@ bool AbstractPolygon2DEditor::forward_gui_input(const Ref<InputEvent> &p_event)
 		if (edited_point.valid() && (wip_active || (mm->get_button_mask() & BUTTON_MASK_LEFT))) {
 
 			Vector2 cpoint = _get_node()->get_global_transform().affine_inverse().xform(canvas_item_editor->snap_point(canvas_item_editor->get_canvas_transform().affine_inverse().xform(gpoint)));
+
+			//Move the point in a single axis. Should only work when editing a polygon and while holding shift.
+			if (mode == MODE_EDIT && mm->get_shift()) {
+				Vector2 old_point = pre_move_edit.get(selected_point.vertex);
+				if (ABS(cpoint.x - old_point.x) > ABS(cpoint.y - old_point.y)) {
+					cpoint.y = old_point.y;
+				} else {
+					cpoint.x = old_point.x;
+				}
+			}
+
 			edited_point = PosVertex(edited_point, cpoint);
 
 			if (!wip_active) {