hack*ahum*infrastructure to implement axonometric grid snapping. horizontal snapping already implemented.

(bzr r1806)

1 files changed, 66 insertions, 2 deletions

diff --git a/src/grid-snapper.cpp b/src/grid-snapper.cpp
index 5c94b9a97..03f6c9d3a 100644
--- a/src/grid-snapper.cpp
+++ b/src/grid-snapper.cpp
@@ -7,6 +7,7 @@
  *   Frank Felfe <innerspace@iname.com>
  *   Carl Hetherington <inkscape@carlh.net>
  *
+ * Copyright (C) 2006      Johan Engelen <johan@shouraizou.nl>
  * Copyright (C) 1999-2002 Authors
  *
  * Released under GNU GPL, read the file 'COPYING' for more information
@@ -16,6 +17,7 @@
 #include "inkscape.h"
 #include "desktop.h"
 #include "display/canvas-grid.h"
+#include "display/canvas-axonomgrid.h"
 
 /**
  * \return x rounded to the nearest multiple of c1 plus c0.
@@ -37,7 +39,8 @@ Inkscape::GridSnapper::GridSnapper(SPNamedView const *nv, NR::Coord const d) : L
 
 }
 
-Inkscape::LineSnapper::LineList Inkscape::GridSnapper::_getSnapLines(NR::Point const &p) const
+Inkscape::LineSnapper::LineList 
+Inkscape::GridSnapper::_getSnapLines(NR::Point const &p) const
 {
     LineList s;
 
@@ -52,7 +55,9 @@ Inkscape::LineSnapper::LineList Inkscape::GridSnapper::_getSnapLines(NR::Point c
         //                 must be rethought and maybe only the current view
         //                 should give back it's SHOWN lines to snap to
         //                 For now, the last SPCGrid in _named_view->gridviews will be used.
-        griditem = SP_CGRID(l->data);
+        if ( SP_IS_CGRID(GTK_OBJECT(l->data)) ) {
+            griditem = SP_CGRID(l->data);
+        }
     }
 
     g_assert(griditem != NULL);
@@ -78,6 +83,65 @@ Inkscape::LineSnapper::LineList Inkscape::GridSnapper::_getSnapLines(NR::Point c
     return s;
 }
 
+
+
+Inkscape::AxonomGridSnapper::AxonomGridSnapper(SPNamedView const *nv, NR::Coord const d) : LineSnapper(nv, d)
+{
+
+}
+
+
+Inkscape::LineSnapper::LineList 
+Inkscape::AxonomGridSnapper::_getSnapLines(NR::Point const &p) const
+{
+    LineList s;
+
+    if ( NULL == _named_view ) {
+        return s;
+    }
+
+    SPCAxonomGrid *griditem = NULL;
+    for (GSList *l = _named_view->gridviews; l != NULL; l = l->next) {
+        // FIXME : this is a hack since there is only one view for now
+        //                 but when we'll handle multiple views, snapping should
+        //                 must be rethought and maybe only the current view
+        //                 should give back it's SHOWN lines to snap to
+        //                 For now, the last SPCAxonomGrid in _named_view->gridviews will be used.
+        if ( SP_IS_CAXONOMGRID(GTK_OBJECT(l->data)) ) {
+            griditem = SP_CAXONOMGRID(l->data);
+        }
+    }
+
+    g_assert(griditem != NULL);
+
+    // add vertical line.       
+    
+
+    // This is to make sure we snap to only visible grid lines
+    double scaled_spacing = griditem->spacing_ylines; // this is spacing of visible lines if screen pixels
+    // convert screen pixels to px
+    // FIXME: after we switch to snapping dist in screen pixels, this will be unnecessary
+    if (SP_ACTIVE_DESKTOP) {
+        scaled_spacing /= SP_ACTIVE_DESKTOP->current_zoom();
+    }
+
+    NR::Coord const rounded = round_to_nearest_multiple_plus(p[0], scaled_spacing, griditem->origin[0]);
+    
+    int a = round(scaled_spacing);
+    int b = round(p[0]);
+    int c = round(rounded);
+    
+    g_message("hier %d; %d; %d",a,b,c);
+
+
+    s.push_back(std::make_pair(NR::Dim2(0), rounded));
+    
+
+    return s;
+}
+
+
+
 /*
   Local Variables:
   mode:c++