Draw perspective lines for infinite VPs, too (they are updated during scrolling or zooming); don't create knots for infinite VPs on the canvas

(bzr r3495)

1 files changed, 11 insertions, 0 deletions

diff --git a/src/display/sp-canvas.cpp b/src/display/sp-canvas.cpp
index fef2fcc0c..c53b1e61b 100644
--- a/src/display/sp-canvas.cpp
+++ b/src/display/sp-canvas.cpp
@@ -34,6 +34,8 @@
 #include <libnr/nr-matrix-ops.h>
 #include <libnr/nr-convex-hull.h>
 #include "prefs-utils.h"
+#include "box3d-context.h"
+#include "inkscape.h"
 
 // Tiles are a way to minimize the number of redraws, eliminating too small redraws. 
 // The canvas stores a 2D array of ints, each representing a TILE_SIZExTILE_SIZE pixels tile.
@@ -2193,6 +2195,15 @@ sp_canvas_scroll_to (SPCanvas *canvas, double cx, double cy, unsigned int clear,
     } else {
         // scrolling as part of zoom; do nothing here - the next do_update will perform full redraw
     }
+
+    /*  update perspective lines if we are in the 3D box tool (so that infinite ones are shown correctly) */
+    SPEventContext *ec = inkscape_active_event_context();
+    if (SP_IS_3DBOX_CONTEXT (ec)) {
+        // We could avoid redraw during panning by checking the status of is_scrolling, but this is
+        // neither faster nor does it get rid of artefacts, so we update PLs unconditionally
+        SP3DBoxContext *bc = SP_3DBOX_CONTEXT (ec);
+        bc->_vpdrag->updateLines();
+    }
 }
 
 /**