From a26ea800c61fdc4f8d4d8a8b5e882a29e0e2e5c4 Mon Sep 17 00:00:00 2001
From: "Johan B. C. Engelen" <jbc.engelen@swissonline.ch>
Date: Thu, 8 May 2008 18:52:45 +0000
Subject: add LPEConstructGrid

(bzr r5633)
---
 src/live_effects/lpe-constructgrid.cpp | 103 +++++++++++++++++++++++++++++++++
 1 file changed, 103 insertions(+)
 create mode 100644 src/live_effects/lpe-constructgrid.cpp

(limited to 'src/live_effects/lpe-constructgrid.cpp')

diff --git a/src/live_effects/lpe-constructgrid.cpp b/src/live_effects/lpe-constructgrid.cpp
new file mode 100644
index 000000000..1273e8b7c
--- /dev/null
+++ b/src/live_effects/lpe-constructgrid.cpp
@@ -0,0 +1,103 @@
+#define INKSCAPE_LPE_CONSTRUCTGRID_CPP
+/** \file
+ * LPE Construct Grid implementation
+ */
+/*
+ * Authors:
+ *   Johan Engelen
+*
+* Copyright (C) Johan Engelen 2008 <j.b.c.engelen@utwente.nl>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "live_effects/lpe-constructgrid.h"
+
+#include <2geom/path.h>
+#include <2geom/transforms.h>
+
+#include "nodepath.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( dynamic_cast<Parameter *>(&nr_x) );
+    registerParameter( dynamic_cast<Parameter *>(&nr_y) );
+
+    nr_x.param_make_integer();
+    nr_y.param_make_integer();
+    nr_x.param_set_range(1, NR_HUGE);
+    nr_y.param_set_range(1, NR_HUGE);
+}
+
+LPEConstructGrid::~LPEConstructGrid()
+{
+
+}
+
+std::vector<Geom::Path>
+LPEConstructGrid::doEffect_path (std::vector<Geom::Path> 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
+        std::vector<Geom::Path> 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;
+    }
+}
+
+void
+LPEConstructGrid::setup_nodepath(Inkscape::NodePath::Path *np)
+{
+    Effect::setup_nodepath(np);
+    sp_nodepath_make_straight_path(np);
+}
+
+} //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 :
-- 
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