New LPE: Perpendicular bisector

(bzr r5695)

5 files changed, 151 insertions, 1 deletions

diff --git a/src/live_effects/Makefile_insert b/src/live_effects/Makefile_insert
index c476948b6..7e8a9e3a3 100644
--- a/src/live_effects/Makefile_insert
+++ b/src/live_effects/Makefile_insert
@@ -44,5 +44,7 @@ live_effects_liblive_effects_a_SOURCES = \
 	live_effects/lpe-perspective_path.cpp	\
 	live_effects/lpe-perspective_path.h		\
 	live_effects/lpe-envelope.cpp	\
-	live_effects/lpe-envelope.h
+	live_effects/lpe-envelope.h	\
+	live_effects/lpe-perp_bisector.cpp	\
+	live_effects/lpe-perp_bisector.h
 
diff --git a/src/live_effects/effect.cpp b/src/live_effects/effect.cpp
index 125d22c3f..6ae30fe4c 100644
--- a/src/live_effects/effect.cpp
+++ b/src/live_effects/effect.cpp
@@ -45,6 +45,7 @@
 #include "live_effects/lpe-spiro.h"
 #include "live_effects/lpe-constructgrid.h"
 #include "live_effects/lpe-envelope.h"
+#include "live_effects/lpe-perp_bisector.h"
 // end of includes
 
 #include "nodepath.h"
@@ -70,6 +71,7 @@ const Util::EnumData<EffectType> LPETypeData[INVALID_LPE] = {
     {SPIRO,      N_("Spiro spline"),      "spiro"},
     {CONSTRUCT_GRID,        N_("Construct grid"),        "construct_grid"},
     {ENVELOPE,              N_("Envelope Deformation"),  "envelope"},
+    {PERP_BISECTOR, N_("Perpendicular bisector"), "perp_bisector"},
 };
 const Util::EnumDataConverter<EffectType> LPETypeConverter(LPETypeData, INVALID_LPE);
 
@@ -119,6 +121,9 @@ Effect::New(EffectType lpenr, LivePathEffectObject *lpeobj)
         case ENVELOPE:
             neweffect = static_cast<Effect*> ( new LPEEnvelope(lpeobj) );
             break;
+        case PERP_BISECTOR:
+            neweffect = static_cast<Effect*> ( new LPEPerpBisector(lpeobj) );
+            break;
         default:
             g_warning("LivePathEffect::Effect::New   called with invalid patheffect type (%d)", lpenr);
             neweffect = NULL;
diff --git a/src/live_effects/effect.h b/src/live_effects/effect.h
index 328181adc..086b973af 100644
--- a/src/live_effects/effect.h
+++ b/src/live_effects/effect.h
@@ -66,6 +66,7 @@ enum EffectType {
     SPIRO,
     CONSTRUCT_GRID,
     ENVELOPE,
+    PERP_BISECTOR,
     INVALID_LPE // This must be last
 };
 
diff --git a/src/live_effects/lpe-perp_bisector.cpp b/src/live_effects/lpe-perp_bisector.cpp
new file mode 100644
index 000000000..c744f1268
--- /dev/null
+++ b/src/live_effects/lpe-perp_bisector.cpp
@@ -0,0 +1,94 @@
+#define INKSCAPE_LPE_PERP_BISECTOR_CPP
+/** \file
+ * LPE <perp_bisector> implementation.
+ */
+/*
+ * Authors:
+ *   Maximilian Albert
+ *   Johan Engelen
+ *
+ * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ * Copyright (C) Maximilin Albert 2008 <maximilian.albert@gmail.com>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "live_effects/lpe-perp_bisector.h"
+#include "display/curve.h"
+#include <libnr/n-art-bpath.h>
+
+#include <2geom/path.h>
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+LPEPerpBisector::LPEPerpBisector(LivePathEffectObject *lpeobject) :
+    Effect(lpeobject),
+    length_left(_("Length left"), _(""), "length-left", &wr, this, 200),
+    length_right(_("Length right"), _(""), "length-right", &wr, this, 200)
+{
+    registerParameter( dynamic_cast<Parameter *>(&length_left) );
+    registerParameter( dynamic_cast<Parameter *>(&length_right) );
+}
+
+LPEPerpBisector::~LPEPerpBisector()
+{
+
+}
+
+Geom::Point LPEPerpBisector::left_end(Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in) {
+    Geom::Point A(pwd2_in.firstValue());
+    Geom::Point B(pwd2_in.lastValue());
+    Geom::Point M((A + B)/2);
+
+    Geom::Point dir1((B - M).ccw());
+
+    if (dir1.length() > Geom::EPSILON)
+        dir1 = Geom::unit_vector(dir1) * length_left;
+
+    return M + dir1;
+}
+
+Geom::Piecewise<Geom::D2<Geom::SBasis> >
+LPEPerpBisector::doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in)
+{
+    using namespace Geom;
+
+    Piecewise<D2<SBasis> > output;
+
+    Point A(pwd2_in.firstValue());
+    Point B(pwd2_in.lastValue());
+    Point M((A + B)/2);
+
+    Point dir1((B - M).ccw());
+    Point dir2((A - M).ccw());
+
+    if (dir1.length() > EPSILON)
+        dir1 = unit_vector(dir1) * length_left;
+
+    if (dir2.length() > EPSILON)
+        dir2 = unit_vector(dir2) * length_right;
+
+    Point C(M + dir1);
+    Point D(M + dir2);
+
+    output = Piecewise<D2<SBasis> >(D2<SBasis>(Linear(C[X], D[X]), Linear(C[Y], D[Y])));
+
+    return output;
+}
+
+/* ######################## */
+
+} //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 :
diff --git a/src/live_effects/lpe-perp_bisector.h b/src/live_effects/lpe-perp_bisector.h
new file mode 100644
index 000000000..c25ba35f5
--- /dev/null
+++ b/src/live_effects/lpe-perp_bisector.h
@@ -0,0 +1,48 @@
+#ifndef INKSCAPE_LPE_PERP_BISECTOR_H
+#define INKSCAPE_LPE_PERP_BISECTOR_H
+
+/** \file
+ * LPE <perp_bisector> implementation, see lpe-perp_bisector.cpp.
+ */
+/*
+ * Authors:
+ *   Maximilian Albert
+ *   Johan Engelen
+ *
+ * Copyright (C) Johan Engelen 2007 <j.b.c.engelen@utwente.nl>
+ * Copyright (C) Maximilin Albert 2008 <maximilian.albert@gmail.com>
+ *
+ * Released under GNU GPL, read the file 'COPYING' for more information
+ */
+
+#include "live_effects/effect.h"
+#include "live_effects/parameter/parameter.h"
+#include "live_effects/parameter/point.h"
+
+namespace Inkscape {
+namespace LivePathEffect {
+
+class LPEPerpBisector : public Effect {
+public:
+    LPEPerpBisector(LivePathEffectObject *lpeobject);
+    virtual ~LPEPerpBisector();
+
+    virtual EffectType effectType () { return PERP_BISECTOR; }
+
+    virtual Geom::Piecewise<Geom::D2<Geom::SBasis> >
+      doEffect_pwd2 (Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);
+
+    Geom::Point left_end(Geom::Piecewise<Geom::D2<Geom::SBasis> > const & pwd2_in);
+
+private:
+    ScalarParam length_left;
+    ScalarParam length_right;
+
+    LPEPerpBisector(const LPEPerpBisector&);
+    LPEPerpBisector& operator=(const LPEPerpBisector&);
+};
+
+} //namespace LivePathEffect
+} //namespace Inkscape
+
+#endif