From 6dd19af43993f96e76664734874f2b504f188218 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Gilles=20Roudi=C3=A8re?= <gilles.roudiere@gmail.com>
Date: Thu, 1 Oct 2020 12:19:45 +0200
Subject: [PATCH] Fix scale cursor rotation and handle diagonal ones

---
 editor/plugins/canvas_item_editor_plugin.cpp | 56 +++++++++++---------
 1 file changed, 31 insertions(+), 25 deletions(-)

diff --git a/editor/plugins/canvas_item_editor_plugin.cpp b/editor/plugins/canvas_item_editor_plugin.cpp
index 402ec5d80dc..470d19e65a8 100644
--- a/editor/plugins/canvas_item_editor_plugin.cpp
+++ b/editor/plugins/canvas_item_editor_plugin.cpp
@@ -2599,12 +2599,28 @@ void CanvasItemEditor::_gui_input_viewport(const Ref<InputEvent> &p_event) {
 }
 
 void CanvasItemEditor::_update_cursor() {
-	CursorShape c = CURSOR_ARROW;
-	bool should_switch = false;
-	if (drag_selection.size() != 0) {
-		float angle = drag_selection[0]->_edit_get_rotation();
-		should_switch = abs(Math::cos(angle)) < Math_SQRT12;
+	// Compute an eventual rotation of the cursor
+	CursorShape rotation_array[4] = { CURSOR_HSIZE, CURSOR_BDIAGSIZE, CURSOR_VSIZE, CURSOR_FDIAGSIZE };
+	int rotation_array_index = 0;
+
+	List<CanvasItem *> selection = _get_edited_canvas_items();
+	if (selection.size() == 1) {
+		float angle = Math::fposmod((double)selection[0]->get_global_transform_with_canvas().get_rotation(), Math_PI);
+		if (angle > Math_PI * 7.0 / 8.0) {
+			rotation_array_index = 0;
+		} else if (angle > Math_PI * 5.0 / 8.0) {
+			rotation_array_index = 1;
+		} else if (angle > Math_PI * 3.0 / 8.0) {
+			rotation_array_index = 2;
+		} else if (angle > Math_PI * 1.0 / 8.0) {
+			rotation_array_index = 3;
+		} else {
+			rotation_array_index = 0;
+		}
 	}
+
+	// Choose the correct cursor
+	CursorShape c = CURSOR_ARROW;
 	switch (drag_type) {
 		case DRAG_NONE:
 			switch (tool) {
@@ -2626,38 +2642,28 @@ void CanvasItemEditor::_update_cursor() {
 			break;
 		case DRAG_LEFT:
 		case DRAG_RIGHT:
+			c = rotation_array[rotation_array_index];
+			break;
 		case DRAG_V_GUIDE:
-			if (should_switch) {
-				c = CURSOR_VSIZE;
-			} else {
-				c = CURSOR_HSIZE;
-			}
+			c = CURSOR_HSIZE;
 			break;
 		case DRAG_TOP:
 		case DRAG_BOTTOM:
+			c = rotation_array[(rotation_array_index + 2) % 4];
+			break;
 		case DRAG_H_GUIDE:
-			if (should_switch) {
-				c = CURSOR_HSIZE;
-			} else {
-				c = CURSOR_VSIZE;
-			}
+			c = CURSOR_VSIZE;
 			break;
 		case DRAG_TOP_LEFT:
 		case DRAG_BOTTOM_RIGHT:
+			c = rotation_array[(rotation_array_index + 3) % 4];
+			break;
 		case DRAG_DOUBLE_GUIDE:
-			if (should_switch) {
-				c = CURSOR_BDIAGSIZE;
-			} else {
-				c = CURSOR_FDIAGSIZE;
-			}
+			c = CURSOR_FDIAGSIZE;
 			break;
 		case DRAG_TOP_RIGHT:
 		case DRAG_BOTTOM_LEFT:
-			if (should_switch) {
-				c = CURSOR_FDIAGSIZE;
-			} else {
-				c = CURSOR_BDIAGSIZE;
-			}
+			c = rotation_array[(rotation_array_index + 1) % 4];
 			break;
 		case DRAG_MOVE:
 			c = CURSOR_MOVE;