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| author | Johan B. C. Engelen <jbc.engelen@swissonline.ch> | 2006-10-23 19:02:59 +0000 |
|---|---|---|
| committer | johanengelen <johanengelen@users.sourceforge.net> | 2006-10-23 19:02:59 +0000 |
| commit | 4e3f8406d29a35f1c2c4a43542c4714a31e84c12 (patch) | |
| tree | 64a744a2663956274f0d4fb8cd610b9995a25899 /src/axonomgrid-snapper.cpp | |
| parent | Added new name to the AUTHORS file (diff) | |
| download | inkscape-4e3f8406d29a35f1c2c4a43542c4714a31e84c12.tar.gz inkscape-4e3f8406d29a35f1c2c4a43542c4714a31e84c12.zip | |
Axonometric grid: snapping to vertical gridlines
(bzr r1846)
Diffstat (limited to 'src/axonomgrid-snapper.cpp')
| -rw-r--r-- | src/axonomgrid-snapper.cpp | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/src/axonomgrid-snapper.cpp b/src/axonomgrid-snapper.cpp new file mode 100644 index 000000000..674357d44 --- /dev/null +++ b/src/axonomgrid-snapper.cpp @@ -0,0 +1,84 @@ +#ifdef AXONOM
+
+/**
+ * \file axonomgrid-snapper.cpp
+ * \brief Snapping things to axonometric grids.
+ *
+ * Author:
+ * Johan Engelen <johan@shouraizou.nl>
+ *
+ * Copyright (C) 2006 Authors
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "sp-namedview.h"
+#include "inkscape.h"
+#include "desktop.h"
+#include "display/canvas-grid.h"
+
+/**
+ * \return x rounded to the nearest multiple of c1 plus c0.
+ *
+ * \note
+ * If c1==0 (and c0 is finite), then returns +/-inf. This makes grid spacing of zero
+ * mean "ignore the grid in this dimention". We're currently discussing "good" semantics
+ * for guide/grid snapping.
+ */
+
+/* FIXME: move this somewhere else, perhaps */
+static double round_to_nearest_multiple_plus(double x, double const c1, double const c0)
+{
+ return floor((x - c0) / c1 + .5) * c1 + c0;
+}
+
+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;
+ }
+
+ SPCGrid *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 SPCGrid in _named_view->gridviews will be used.
+ griditem = SP_CGRID(l->data);
+ }
+
+ g_assert(griditem != NULL);
+
+ for (unsigned int i = 0; i < 2; ++i) {
+
+ /* This is to make sure we snap to only visible grid lines */
+ double scaled_spacing = griditem->sw[i]; // 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[i],
+ scaled_spacing,
+ _named_view->gridorigin[i]);
+
+ s.push_back(std::make_pair(NR::Dim2(i), rounded));
+ }
+
+ return s;
+}
+
+
+
+#endif
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