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/object/sp-guide.cpp | 31 ++++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

(limited to 'src/object/sp-guide.cpp')

diff --git a/src/object/sp-guide.cpp b/src/object/sp-guide.cpp
index 0b8558230..acb0707d0 100644
--- a/src/object/sp-guide.cpp
+++ b/src/object/sp-guide.cpp
@@ -131,6 +131,12 @@ void SPGuide::set(unsigned int key, const gchar *value) {
             g_strfreev (strarray);
             if (success == 2 && (fabs(newx) > 1e-6 || fabs(newy) > 1e-6)) {
                 Geom::Point direction(newx, newy);
+
+                // <sodipodi:guide> stores inverted y-axis coordinates
+                if (SP_ACTIVE_DESKTOP && SP_ACTIVE_DESKTOP->is_yaxisdown()) {
+                    direction[Geom::Y] *= -1.0;
+                }
+
                 direction.normalize();
                 this->normal_to_line = direction;
             } else {
@@ -176,6 +182,11 @@ void SPGuide::set(unsigned int key, const gchar *value) {
                     this->point_on_line = Geom::Point(newx, 0);
                 }
             }
+
+            // <sodipodi:guide> stores inverted y-axis coordinates
+            if (SP_ACTIVE_DESKTOP && SP_ACTIVE_DESKTOP->is_yaxisdown()) {
+                this->point_on_line[Geom::Y] = document->getHeight().value("px") - this->point_on_line[Geom::Y];
+            }
         } else {
             // default to (0,0) for bad arguments
             this->point_on_line = Geom::Point(0,0);
@@ -217,6 +228,12 @@ SPGuide *SPGuide::createSPGuide(SPDocument *doc, Geom::Point const &pt1, Geom::P
         }
     }
 
+    // <sodipodi:guide> stores inverted y-axis coordinates
+    if (SP_ACTIVE_DESKTOP && SP_ACTIVE_DESKTOP->is_yaxisdown()) {
+        newy = doc->getHeight().value("px") - newy;
+        n[Geom::Y] *= -1.0;
+    }
+
     sp_repr_set_point(repr, "position", Geom::Point( newx, newy ));
     sp_repr_set_point(repr, "orientation", n);
 
@@ -368,6 +385,11 @@ void SPGuide::moveto(Geom::Point const point_on_line, bool const commit)
         double newx = point_on_line.x();
         double newy = point_on_line.y();
 
+        // <sodipodi:guide> stores inverted y-axis coordinates
+        if (SP_ACTIVE_DESKTOP && SP_ACTIVE_DESKTOP->is_yaxisdown()) {
+            newy = document->getHeight().value("px") - newy;
+        }
+
         SPRoot *root = document->getRoot();
         if( root->viewBox_set ) {
             // check to see if scaling is uniform
@@ -414,7 +436,14 @@ void SPGuide::set_normal(Geom::Point const normal_to_line, bool const commit)
        case, so that the guide's new position is available for sp_item_rm_unsatisfied_cns. */
     if (commit) {
         //XML Tree being used directly while it shouldn't be
-        sp_repr_set_point(getRepr(), "orientation", normal_to_line);
+        auto normal = normal_to_line;
+
+        // <sodipodi:guide> stores inverted y-axis coordinates
+        if (SP_ACTIVE_DESKTOP && SP_ACTIVE_DESKTOP->is_yaxisdown()) {
+            normal[Geom::Y] *= -1.0;
+        }
+
+        sp_repr_set_point(getRepr(), "orientation", normal);
     }
 
 /*  DISABLED CODE BECAUSE  SPGuideAttachment  IS NOT USE AT THE MOMENT (johan)
-- 
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