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index 0268cec33c6192c01c16b117791ee5d5915d02f9..e72f1aac15026d7b57f63ca547c997f329b7849a 100644 (file)
#define INKSCAPE_LPE_CURVESTITCH_CPP
/** \file
- * SVG <skeleton> implementation, used as an example for a base starting class
+ * LPE Curve Stitching implementation, used as an example for a base starting class
* when implementing new LivePathEffects.
*
*/
#include "sp-item.h"
#include "sp-path.h"
#include "live_effects/n-art-bpath-2geom.h"
+#include "xml/repr.h"
#include <2geom/path.h>
#include <2geom/piecewise.h>
LPECurveStitch::LPECurveStitch(LivePathEffectObject *lpeobject) :
Effect(lpeobject),
strokepath(_("Stroke path"), _("The path that will be used as stitch."), "strokepath", &wr, this, "M0,0 L1,0"),
- 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),
+ nrofpaths(_("Number of paths"), _("The number of paths that will be generated."), "count", &wr, this, 5),
+ startpoint_edge_variation(_("Start edge variance"), _("The amount of random jitter to move the start points of the stitches inside & outside the guide path"), "startpoint_edge_variation", &wr, this, 0),
+ startpoint_spacing_variation(_("Start spacing variance"), _("The amount of random shifting to move the start points of the stitches back & forth along the guide path"), "startpoint_spacing_variation", &wr, this, 0),
+ endpoint_edge_variation(_("End edge variance"), _("The amount of randomness that moves the end points of the stitches inside & outside the guide path"), "endpoint_edge_variation", &wr, this, 0),
+ endpoint_spacing_variation(_("End spacing variance"), _("The amount of random shifting to move the end points of the stitches back & forth along the guide path"), "endpoint_spacing_variation", &wr, this, 0),
prop_scale(_("Scale width"), _("Scaling of the width of the stroke path"), "prop_scale", &wr, this, 1),
scale_y_rel(_("Scale width relative"), _("Scale the width of the stroke path relative to its length"), "scale_y_rel", &wr, this, false)
{
registerParameter( dynamic_cast<Parameter *>(&nrofpaths) );
- registerParameter( dynamic_cast<Parameter *>(&startpoint_variation) );
- registerParameter( dynamic_cast<Parameter *>(&endpoint_variation) );
+ registerParameter( dynamic_cast<Parameter *>(&startpoint_edge_variation) );
+ registerParameter( dynamic_cast<Parameter *>(&startpoint_spacing_variation) );
+ registerParameter( dynamic_cast<Parameter *>(&endpoint_edge_variation) );
+ registerParameter( dynamic_cast<Parameter *>(&endpoint_spacing_variation) );
registerParameter( dynamic_cast<Parameter *>(&strokepath) );
registerParameter( dynamic_cast<Parameter *>(&prop_scale) );
registerParameter( dynamic_cast<Parameter *>(&scale_y_rel) );
}
std::vector<Geom::Path>
-LPECurveStitch::doEffect (std::vector<Geom::Path> & path_in)
+LPECurveStitch::doEffect_path (std::vector<Geom::Path> & path_in)
{
if (path_in.size() >= 2) {
- startpoint_variation.resetRandomizer();
- endpoint_variation.resetRandomizer();
+ startpoint_edge_variation.resetRandomizer();
+ endpoint_edge_variation.resetRandomizer();
+ startpoint_spacing_variation.resetRandomizer();
+ endpoint_spacing_variation.resetRandomizer();
D2<Piecewise<SBasis> > stroke = make_cuts_independant(strokepath);
Interval bndsStroke = bounds_exact(stroke[0]);
Interval bndsStrokeY = bounds_exact(stroke[1]);
Point stroke_origin(bndsStroke.min(), (bndsStrokeY.max()+bndsStrokeY.min())/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.get_value() != 0)
- start = start + startpoint_variation * (end - start);
- if (endpoint_variation.get_value() != 0)
- end = end + endpoint_variation * (end - start);
-
- gdouble scaling_y = 1.0;
- if (scale_y_rel.get_value()) {
- scaling_y = (L2(end-start)/scaling)*prop_scale;
- } else {
- scaling_y = prop_scale;
+ std::vector<Geom::Path> path_out;
+
+ // do this for all permutations (ii,jj) if there are more than 2 paths? realllly cool!
+ for (int ii = 0 ; ii < path_in.size() - 1; ii++)
+ for (int jj = ii+1; jj < path_in.size(); jj++)
+ {
+ Piecewise<D2<SBasis> > A = arc_length_parametrization(Piecewise<D2<SBasis> >(path_in[ii].toPwSb()),2,.1);
+ Piecewise<D2<SBasis> > B = arc_length_parametrization(Piecewise<D2<SBasis> >(path_in[jj].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();
+ gdouble tAclean = tA; // the tA without spacing_variation
+ gdouble tBclean = tB; // the tB without spacing_variation
+
+ for (int i = 0; i < nrofpaths; i++) {
+ Point start = A(tA);
+ Point end = B(tB);
+ if (startpoint_edge_variation.get_value() != 0)
+ start = start + (startpoint_edge_variation - startpoint_edge_variation.get_value()/2) * (end - start);
+ if (endpoint_edge_variation.get_value() != 0)
+ end = end + (endpoint_edge_variation - endpoint_edge_variation.get_value()/2)* (end - start);
+
+ if (!Geom::are_near(start,end)) {
+ gdouble scaling_y = 1.0;
+ if (scale_y_rel.get_value()) {
+ scaling_y = (L2(end-start)/scaling)*prop_scale;
+ } else {
+ scaling_y = prop_scale;
+ }
+
+ Matrix transform;
+ transform.setXAxis( (end-start) / scaling );
+ transform.setYAxis( rot90(unit_vector(end-start)) * scaling_y);
+ transform.setTranslation( start );
+ Piecewise<D2<SBasis> > pwd2_out = (strokepath-stroke_origin) * transform;
+
+ // add stuff to one big pw<d2<sbasis> > and then outside the loop convert to path?
+ // No: this way, the separate result paths are kept separate which might come in handy some time!
+ std::vector<Geom::Path> result = Geom::path_from_piecewise(pwd2_out, LPE_CONVERSION_TOLERANCE);
+ path_out.push_back(result[0]);
+ }
+ gdouble svA = startpoint_spacing_variation - startpoint_spacing_variation.get_value()/2;
+ gdouble svB = endpoint_spacing_variation - endpoint_spacing_variation.get_value()/2;
+ tAclean += incrementA;
+ tBclean += incrementB;
+ tA = tAclean + incrementA * svA;
+ tB = tBclean + incrementB * svB;
+ if (tA > bndsA.max())
+ tA = bndsA.max();
+ if (tB > bndsB.max())
+ tB = bndsB.max();
}
-
- Matrix transform;
- transform.setXAxis( (end-start) / scaling );
- transform.setYAxis( rot90(unit_vector(end-start)) * scaling_y);
- transform.setTranslation( start );
- Piecewise<D2<SBasis> > pwd2_out = (strokepath-stroke_origin) * transform;
- // add stuff to one big pw<d2<sbasis> > and then outside the loop convert to path?
- std::vector<Path> result = Geom::path_from_piecewise(pwd2_out, LPE_CONVERSION_TOLERANCE);
- path_out[i] = result[0];
- tA += incrementA;
- tB += incrementB;
}
return path_out;
// set the stroke path to run horizontally in the middle of the bounding box of the original path
Piecewise<D2<SBasis> > pwd2;
- std::vector<Path> temppath = SVGD_to_2GeomPath( SP_OBJECT_REPR(item)->attribute("inkscape:original-d"));
+ std::vector<Geom::Path> temppath = SVGD_to_2GeomPath( SP_OBJECT_REPR(item)->attribute("inkscape:original-d"));
for (unsigned int i=0; i < temppath.size(); i++) {
pwd2.concat( temppath[i].toPwSb() );
}
Point start(bndsX.min(), (bndsY.max()+bndsY.min())/2);
Point end(bndsX.max(), (bndsY.max()+bndsY.min())/2);
- Geom::Path path;
- path.start( start );
- path.appendNew<Geom::LineSegment>( end );
- strokepath.param_set_and_write_new_value( path.toPwSb() );
+ if ( !Geom::are_near(start,end) ) {
+ Geom::Path path;
+ path.start( start );
+ path.appendNew<Geom::LineSegment>( end );
+ strokepath.param_set_and_write_new_value( path.toPwSb() );
+ } else {
+ // bounding box is too small to make decent path. set to default default. :-)
+ strokepath.param_set_and_write_default();
+ }
+}
+
+void
+LPECurveStitch::transform_multiply(Geom::Matrix const& postmul, bool set)
+{
+ // only take translations into account
+ if (postmul.isTranslation()) {
+ strokepath.param_transform_multiply(postmul, set);
+ } else if (!scale_y_rel.get_value()) {
+ // this basically means that for this transformation, the result should be the same as normal scaling the result path
+ // don't know how to do this yet.
+// Geom::Matrix new_postmul;
+ //new_postmul.setIdentity();
+// new_postmul.setTranslation(postmul.translation());
+// Effect::transform_multiply(new_postmul, set);
+ }
}
} //namespace LivePathEffect