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/ui/tools/measure-tool.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'src/ui/tools/measure-tool.cpp')

diff --git a/src/ui/tools/measure-tool.cpp b/src/ui/tools/measure-tool.cpp
index a305fa350..75335ce1a 100644
--- a/src/ui/tools/measure-tool.cpp
+++ b/src/ui/tools/measure-tool.cpp
@@ -862,6 +862,13 @@ void MeasureTool::setGuide(Geom::Point origin,double angle, const char *label)
     if(!namedview) {
         return;
     }
+
+    // <sodipodi:guide> stores inverted y-axis coordinates
+    if (desktop->is_yaxisdown()) {
+        origin[Geom::Y] = doc->getHeight().value("px") - origin[Geom::Y];
+        angle *= -1.0;
+    }
+
     origin *= affine; 
     //measure angle
     Inkscape::XML::Node *guide;
-- 
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