From 00b0f245b05292b755cd7520933f424e12f0ee38 Mon Sep 17 00:00:00 2001
From: Thomas Holder <speleo3@users.sourceforge.net>
Date: Sat, 20 Dec 2008 10:12:04 +0000
Subject: object-snapper.cpp  * fix snapping to clip/mask with parent transform
  * replace matrix_to_desktop call

sp-item.h
sp-item.cpp
 * improve snapping to clip/mask with parent transform
 * remove matrix_to_desktop/matrix_from_desktop
 * use desktop->doc2dt() with sp_item_i2d_affine(...)

desktop.h
desktop.cpp
 * new method: dt2doc()

selection-chemistry.cpp
 * remove awkward matrix_to_desktop(matrix_from_desktop(...)) calls

(bzr r7016)
---
 src/desktop.cpp | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

(limited to 'src/desktop.cpp')

diff --git a/src/desktop.cpp b/src/desktop.cpp
index cd39e77ae..85c53be6f 100644
--- a/src/desktop.cpp
+++ b/src/desktop.cpp
@@ -1806,6 +1806,12 @@ Geom::Matrix SPDesktop::doc2dt() const
     return _doc2dt;
 }
 
+Geom::Matrix SPDesktop::dt2doc() const
+{
+    // doc2dt is its own inverse
+    return _doc2dt;
+}
+
 Geom::Point SPDesktop::doc2dt(Geom::Point const &p) const
 {
     return p * _doc2dt;
@@ -1813,7 +1819,7 @@ Geom::Point SPDesktop::doc2dt(Geom::Point const &p) const
 
 Geom::Point SPDesktop::dt2doc(Geom::Point const &p) const
 {
-    return p * _doc2dt.inverse();
+    return p * dt2doc();
 }
 
 
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