Commit LivePathEffect branch to trunk!

(disabled extension/internal/bitmap/*.* in build.xml to fix compilation)

(bzr r3472)

1 files changed, 161 insertions, 0 deletions

diff --git a/src/live_effects/lpe-skeletalstrokes.cpp b/src/live_effects/lpe-skeletalstrokes.cpp
new file mode 100644
index 000000000..47c73a56b
--- /dev/null
+++ b/src/live_effects/lpe-skeletalstrokes.cpp
@@ -0,0 +1,161 @@
+#define INKSCAPE_LPE_SKELETAL_STROKES_CPP

+

+/*

+ * 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-skeletalstrokes.h"

+#include "sp-shape.h"

+#include "display/curve.h"

+#include <libnr/n-art-bpath.h>

+#include "live_effects/n-art-bpath-2geom.h"

+#include "svg/svg.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 <2geom/piecewise.h>

+

+#include <algorithm>

+using std::vector;

+

+

+/* Theory in e-mail from J.F. Barraud

+Let B be the skeleton path, and P the pattern (the path to be deformed).

+

+P is a map t --> P(t) = ( x(t), y(t) ).

+B is a map t --> B(t) = ( a(t), b(t) ).

+

+The first step is to re-parametrize B by its arc length: this is the parametrization in which a point p on B is located by its distance s from start. One obtains a new map s --> U(s) = (a'(s),b'(s)), that still describes the same path B, but where the distance along B from start to

+U(s) is s itself.

+

+We also need a unit normal to the path. This can be obtained by computing a unit tangent vector, and rotate it by 90°. Call this normal vector N(s).

+

+The basic deformation associated to B is then given by:

+

+   (x,y) --> U(x)+y*N(x)

+

+(i.e. we go for distance x along the path, and then for distance y along the normal)

+

+Of course this formula needs some minor adaptations (as is it depends on the absolute position of P for instance, so a little translation is needed

+first) but I think we can first forget about them.

+*/

+

+namespace Inkscape {

+namespace LivePathEffect {

+

+static const Util::EnumData<SkelCopyType> SkelCopyTypeData[SSCT_END] = {

+    {SSCT_SINGLE,               N_("Single"),               "single"},

+    {SSCT_SINGLE_STRETCHED,     N_("Single, stretched"),    "single_stretched"},

+    {SSCT_REPEATED,             N_("Repeated"),             "repeated"},

+    {SSCT_REPEATED_STRETCHED,   N_("Repeated, stretched"),  "repeated_stretched"}

+};

+static const Util::EnumDataConverter<SkelCopyType> SkelCopyTypeConverter(SkelCopyTypeData, SSCT_END);

+

+LPESkeletalStrokes::LPESkeletalStrokes(LivePathEffectObject *lpeobject) :

+    Effect(lpeobject),

+    pattern(_("Pattern"), _("Pattern to put along path"), "pattern", &wr, this),

+    origin(_("Origin"), _("Origin of ?"), "origin", &wr, this),

+    copytype(_("Copytype"), _("tooltip"), "copytype", SkelCopyTypeConverter, &wr, this)

+{

+    registerParameter( dynamic_cast<Parameter *>(&origin) );

+    registerParameter( dynamic_cast<Parameter *>(&pattern) );

+    registerParameter( dynamic_cast<Parameter *>(&copytype) );

+

+    pattern.signal_path_pasted.connect(sigc::mem_fun(*this, &LPESkeletalStrokes::on_pattern_pasted));

+}

+

+LPESkeletalStrokes::~LPESkeletalStrokes()

+{

+

+}

+

+

+Geom::Piecewise<Geom::D2<Geom::SBasis> >

+LPESkeletalStrokes::doEffect (Geom::Piecewise<Geom::D2<Geom::SBasis> > & pwd2_in)

+{

+    using namespace Geom;

+

+/* LOTS OF CODE COPIED FROM 2geom/src/toys/path-along-path.cpp

+ * All credits should go to jfb and mgsloan of lib2geom development! */

+

+    const Util::EnumData<SkelCopyType> * data = copytype.get_selected_data();

+    if (!data)

+        return pwd2_in;

+    SkelCopyType type = data->id;

+

+    Piecewise<D2<SBasis> > uskeleton = arc_length_parametrization(Piecewise<D2<SBasis> >(pwd2_in),2,.1);

+    uskeleton = remove_short_cuts(uskeleton,.01);

+    Piecewise<D2<SBasis> > n = rot90(derivative(uskeleton));

+    n = force_continuity(remove_short_cuts(n,.1));

+

+    D2<Piecewise<SBasis> > patternd2 = make_cuts_independant(pattern);

+    Piecewise<SBasis> x=Piecewise<SBasis>(patternd2[0]-origin[0]);

+    Piecewise<SBasis> y=Piecewise<SBasis>(patternd2[1]-origin[1]);

+    Interval pattBnds = bounds_exact(x);

+

+    int nbCopies = int(uskeleton.cuts.back()/pattBnds.extent());

+    double scaling = 1;

+

+    switch(type) {

+        case SSCT_REPEATED:

+            break;

+

+        case SSCT_SINGLE:

+            nbCopies = (nbCopies > 0) ? 1 : 0;

+            break;

+

+        case SSCT_SINGLE_STRETCHED:

+            nbCopies = 1;

+            scaling = uskeleton.cuts.back()/pattBnds.extent();

+            break;

+

+        case SSCT_REPEATED_STRETCHED:

+             scaling = uskeleton.cuts.back()/(((double)nbCopies)*pattBnds.extent());

+            break;

+

+        default:

+            return pwd2_in;

+    };

+

+    double pattWidth = pattBnds.extent() * scaling;

+

+    x-=pattBnds.min();

+    if (scaling != 1)

+        x*=scaling;

+

+    double offs = 0;

+    Piecewise<D2<SBasis> >output;

+    for (int i=0; i<nbCopies; i++){

+        output.concat(compose(uskeleton,x+offs)+y*compose(n,x+offs));

+        offs+=pattWidth;

+    }

+    return output;

+}

+

+void

+LPESkeletalStrokes::on_pattern_pasted()

+{

+    // a new pattern was pasted through the dialog.  overwrite the origin thingie to the first point of the path

+    origin.param_setValue(pattern.valueAt(0));

+}

+

+

+

+}; // 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 :