1 files changed, 91 insertions, 0 deletions
diff --git a/src/live_effects/lpe-constructgrid.cpp b/src/live_effects/lpe-constructgrid.cpp
new file mode 100644
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--- /dev/null
+++ b/src/live_effects/lpe-constructgrid.cpp
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/** \file
+ * LPE Construct Grid implementation
+ */
+/*
+ * Authors:
+ *   Johan Engelen
+ *
+ * Copyright (C) Johan Engelen 2008 <j.b.c.engelen@utwente.nl>
+ *
+ * Released under GNU GPL v2+, read the file 'COPYING' for more information.
+ */
+
+#include "live_effects/lpe-constructgrid.h"
+// TODO due to internal breakage in glibmm headers, this must be last:
+#include <glibmm/i18n.h>
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+using namespace Geom;
+
+LPEConstructGrid::LPEConstructGrid(LivePathEffectObject *lpeobject) :
+    Effect(lpeobject),
+    nr_x(_("Size _X:"), _("The size of the grid in X direction."), "nr_x", &wr, this, 5),
+    nr_y(_("Size _Y:"), _("The size of the grid in Y direction."), "nr_y", &wr, this, 5)
+{
+    registerParameter(&nr_x);
+    registerParameter(&nr_y);
+
+    nr_x.param_make_integer();
+    nr_y.param_make_integer();
+    nr_x.param_set_range(1, 1e10);
+    nr_y.param_set_range(1, 1e10);
+}
+
+LPEConstructGrid::~LPEConstructGrid()
+= default;
+
+Geom::PathVector
+LPEConstructGrid::doEffect_path (Geom::PathVector const & path_in)
+{
+  // Check that the path has at least 3 nodes (i.e. 2 segments), more nodes are ignored
+    if (path_in[0].size() >= 2) {
+        // read the first 3 nodes:
+        Geom::Path::const_iterator it ( path_in[0].begin() );
+        Geom::Point first_p  = (*it++).initialPoint();
+        Geom::Point origin   = (*it++).initialPoint();
+        Geom::Point second_p = (*it++).initialPoint();
+        // make first_p and second_p be the construction *vectors* of the grid:
+        first_p  -= origin;
+        second_p -= origin;
+        Geom::Translate first_translation( first_p );
+        Geom::Translate second_translation( second_p );
+
+        // create the gridpaths of the two directions
+        Geom::Path first_path( origin );
+        first_path.appendNew<LineSegment>( origin + first_p*nr_y );
+        Geom::Path second_path( origin );
+        second_path.appendNew<LineSegment>( origin + second_p*nr_x );
+
+        // use the gridpaths and set them in the correct grid
+        Geom::PathVector path_out;
+        path_out.push_back(first_path);
+        for (int ix = 0; ix < nr_x; ix++) {
+            path_out.push_back(path_out.back() * second_translation );
+        }
+        path_out.push_back(second_path);
+        for (int iy = 0; iy < nr_y; iy++) {
+            path_out.push_back(path_out.back() * first_translation );
+        }
+
+        return path_out;
+    } else {
+        return path_in;
+    }
+}
+
+} //namespace LivePathEffect
+} /* namespace Inkscape */
+
+/*
+  Local Variables:
+  mode:c++
+  c-file-style:"stroustrup"
+  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
+  indent-tabs-mode:nil
+  fill-column:99
+  End:
+*/
+// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :