1 files changed, 40 insertions, 0 deletions
diff --git a/src/desktop-affine.cpp b/src/desktop-affine.cpp
new file mode 100644
index 000000000..7ad2c7bfe
--- /dev/null
+++ b/src/desktop-affine.cpp
@@ -0,0 +1,40 @@
+#define __SP_DESKTOP_AFFINE_C__
+
+/*
+ * Editable view and widget implementation
+ *
+ * Author:
+ *   Lauris Kaplinski <lauris@kaplinski.com>
+ *
+ * Copyright (C) 1999-2002 Lauris Kaplinski
+ * Copyright (C) 2000-2001 Ximian, Inc.
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "desktop.h"
+#include "document.h"
+#include "sp-root.h"
+#include "libnr/nr-matrix-ops.h"
+
+NR::Matrix const sp_desktop_root2dt_affine (SPDesktop const *dt)
+{
+	SPRoot const *root = SP_ROOT(SP_DOCUMENT_ROOT(dt->doc()));
+	return root->c2p * dt->doc2dt();
+}
+
+NR::Matrix const sp_desktop_dt2root_affine (SPDesktop const *dt)
+{
+	return sp_desktop_root2dt_affine(dt).inverse();
+}
+
+NR::Point sp_desktop_root2dt_xy_point(SPDesktop const *dt, NR::Point const p)
+{
+	return p * sp_desktop_root2dt_affine(dt);
+}
+
+NR::Point sp_desktop_dt2root_xy_point(SPDesktop const *dt, NR::Point const p)
+{
+	return p * sp_desktop_dt2root_affine(dt);
+}
+