From 1fa0c72b664afa4803dffd463ed11ce01632ab76 Mon Sep 17 00:00:00 2001
From: Thomas Holder <thomas@thomas-holder.de>
Date: Wed, 12 Sep 2018 16:43:47 +0200
Subject: New option to invert y-axis

Replaces all hard coded or implicit desktop coordinate usage with
doc2dt multiplication.

New global preference: Interface > Origin at upper left

https://bugs.launchpad.net/inkscape/+bug/170049
---
 src/seltrans.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src/seltrans.cpp')

diff --git a/src/seltrans.cpp b/src/seltrans.cpp
index 837f0da0e..ce7c63b04 100644
--- a/src/seltrans.cpp
+++ b/src/seltrans.cpp
@@ -278,6 +278,10 @@ void Inkscape::SelTrans::grab(Geom::Point const &p, gdouble x, gdouble y, bool s
         _items_centers.push_back(it->getCenter()); // for content-dragging, we need to remember original centers
     }
 
+    if (y != -1 && _desktop->is_yaxisdown()) {
+        y = 1 - y;
+    }
+
     _handle_x = x;
     _handle_y = y;
 
@@ -631,12 +635,14 @@ void Inkscape::SelTrans::_showHandles(SPSelTransType type)
     // shouldn't have nullary bbox, but knots
     g_assert(_bbox);
 
+    auto const y_dir = _desktop->yaxisdir();
+
     for (int i = 0; i < NUMHANDS; i++) {
         if (hands[i].type != type)
             continue;
 
         // Position knots to scale the selection bbox
-        Geom::Point const bpos(hands[i].x, hands[i].y);
+        Geom::Point const bpos(hands[i].x, (hands[i].y - 0.5) * (-y_dir) + 0.5);
         Geom::Point p(_bbox->min() + (_bbox->dimensions() * Geom::Scale(bpos)));
         knots[i]->moveto(p);
         knots[i]->show();
-- 
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