From 0b4b6cf7cdf14a64844186ea1e22ef6a0dba42bb Mon Sep 17 00:00:00 2001
From: "Johan B. C. Engelen" <jbc.engelen@swissonline.ch>
Date: Wed, 29 Aug 2007 22:36:46 +0000
Subject: LPE: - rename RealParam to ScalarParam, add range checking for
 ScalarParam, add integer only flag for it aswell. - fix up todo.txt and
 create new one for parameters - add Curve Stitch LPE

(bzr r3614)
---
 src/live_effects/lpe-curvestitch.cpp | 106 +++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/live_effects/lpe-curvestitch.cpp

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

diff --git a/src/live_effects/lpe-curvestitch.cpp b/src/live_effects/lpe-curvestitch.cpp
new file mode 100644
index 000000000..1769a40a1
--- /dev/null
+++ b/src/live_effects/lpe-curvestitch.cpp
@@ -0,0 +1,106 @@
+#define INKSCAPE_LPE_EXPRESSION_CPP
+/** \file
+ * SVG <skeleton> implementation, used as an example for a base starting class
+ * when implementing new LivePathEffects.
+ *
+ */
+/*
+ * Authors:
+ *   Johan Engelen
+*
+* Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "live_effects/lpe-curvestitch.h"
+#include "display/curve.h"
+#include <libnr/n-art-bpath.h>
+
+#include <2geom/path.h>
+#include <2geom/piecewise.h>
+#include <2geom/sbasis.h>
+#include <2geom/sbasis-geometric.h>
+#include <2geom/bezier-to-sbasis.h>
+#include <2geom/sbasis-to-bezier.h>
+#include <2geom/d2.h>
+
+#include "ui/widget/scalar.h"
+#include "libnr/nr-values.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+using namespace Geom;
+
+LPECurveStitch::LPECurveStitch(LivePathEffectObject *lpeobject) :
+    Effect(lpeobject),
+    strokepath(_("Stroke path"), _("The path that will be stroked, whatever, think of good text here."), "strokepath", &wr, this, "M0,0 L1,1"),
+    nrofpaths(_("Nr of paths"), _("The number of paths that will be generated."), "count", &wr, this, 5),
+    startpoint_variation(_("Startpoint variation"), _("..."), "startpoint_variation", &wr, this, 0),
+    endpoint_variation(_("Endpoint variation"), _("..."), "endpoint_variation", &wr, this, 0)
+{
+    registerParameter( dynamic_cast<Parameter *>(&nrofpaths) );
+//    registerParameter( dynamic_cast<Parameter *>(&startpoint_variation) );
+//    registerParameter( dynamic_cast<Parameter *>(&endpoint_variation) );
+
+    nrofpaths.param_make_integer();
+    nrofpaths.param_set_range(2, NR_HUGE);
+
+//    startpoint_variation.param_set_range(-NR_HUGE, 1);
+//    endpoint_variation.param_set_range(-1, NR_HUGE);
+}
+
+LPECurveStitch::~LPECurveStitch()
+{
+
+}
+
+std::vector<Geom::Path>
+LPECurveStitch::doEffect (std::vector<Geom::Path> & path_in)
+{
+    if (path_in.size() >= 2) {
+        std::vector<Geom::Path> path_out (nrofpaths);
+
+        // do this for all permutations if there are more than 2 paths? realllly cool!
+        Piecewise<D2<SBasis> > A = arc_length_parametrization(Piecewise<D2<SBasis> >(path_in[0].toPwSb()),2,.1);
+        Piecewise<D2<SBasis> > B = arc_length_parametrization(Piecewise<D2<SBasis> >(path_in[1].toPwSb()),2,.1);
+        Interval bndsA = A.domain();
+        Interval bndsB = B.domain();
+        gdouble incrementA = (bndsA.max()-bndsA.min()) / (nrofpaths-1);
+        gdouble incrementB = (bndsB.max()-bndsB.min()) / (nrofpaths-1);
+        gdouble tA = bndsA.min();
+        gdouble tB = bndsB.min();
+        for (int i = 0; i < nrofpaths; i++) {
+            Point start = A(tA);
+            Point end = B(tB);
+            if (startpoint_variation != 0)
+                start = start + g_random_double_range(0, startpoint_variation) * (end - start);
+            if (endpoint_variation != 0)
+                end = end + g_random_double_range(0, endpoint_variation) * (end - start);
+
+            path_out[i].start( start );
+            path_out[i].appendNew<LineSegment>( end );
+            tA += incrementA;
+            tB += incrementB;
+        }
+
+        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 :
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