1 files changed, 140 insertions, 0 deletions
diff --git a/src/toys/path-effects.cpp b/src/toys/path-effects.cpp
new file mode 100644
index 0000000..fdd7ef0
--- /dev/null
+++ b/src/toys/path-effects.cpp
@@ -0,0 +1,140 @@
+#include <2geom/d2.h>
+#include <2geom/sbasis.h>
+
+#include <2geom/path.h>
+#include <2geom/pathvector.h>
+#include <2geom/svg-path-parser.h>
+
+#include <toys/path-cairo.h>
+#include <toys/toy-framework-2.h>
+#include <2geom/transforms.h>
+#include <2geom/sbasis-geometric.h>
+#include <2geom/sbasis-to-bezier.h>
+#include <2geom/sbasis-math.h>
+
+#include <cstdlib>
+
+using namespace Geom;
+
+Piecewise<SBasis > sore_tooth(Interval intv) {
+    Piecewise<SBasis >  out;
+    double t = intv.min();
+    Point p(0,0);
+    out.push_cut(0);
+    double r = 20;
+    double dir = 0.5;
+    while(t < intv.max()) {
+        double nt = t + 10;
+        if(nt > intv.max())
+            nt = intv.max();
+        SBasis zag(r*Linear(dir,-dir));
+        out.push(zag, nt);
+        t = nt;
+        dir = -dir;
+    }
+    return out;
+}
+
+Piecewise< D2<SBasis> > zaggy(Interval intv, double dt, double radius) {
+    Piecewise<D2<SBasis> >  out;
+    double t = intv.min();
+    Point p(0,0);
+    out.push_cut(0);
+    while(t < intv.max()) {
+        double nt = t + uniform()*dt;
+        if(nt > intv.max())
+            nt = intv.max();
+        Point np = Point((uniform()-0.5)*2*radius, (uniform()-0.5)*2*radius);
+        D2<SBasis> zag(SBasis(p[0],np[0]), SBasis(p[1],np[1]));
+        p = np;
+        //std::cout << t <<","<< nt << p << np << std::endl;
+        out.push(zag, nt);
+        t = nt;
+    }
+    return out;
+}
+
+
+class BoolOps: public Toy {
+    PathVector pv;
+    PointHandle offset_handle;
+    void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
+        Geom::Translate t(offset_handle.pos);
+        
+        cairo_set_line_width(cr, 1);
+        cairo_set_source_rgb(cr, 0.75,0.75,1);
+        
+        //cairo_shape(cr, bst);
+        cairo_path(cr, pv*t);
+        cairo_stroke(cr);
+	
+        cairo_set_source_rgb(cr, 0,0,0);
+	for(const auto & i : pv) {
+	  Piecewise<D2<SBasis> > B = i.toPwSb();
+	  Piecewise<D2<SBasis> > n = rot90(unitVector(derivative(B)));
+	  Piecewise<SBasis > al = arcLengthSb(B);
+	  
+#if 0
+	  Piecewise<D2<SBasis> > offset_curve = Piecewise<D2<SBasis> >(B)+n*offset;
+	  PathVector offset_path = path_from_piecewise(offset_curve, 0.1);
+        
+	  cairo_path(cr, offset_path*t);
+	  cairo_stroke(cr);
+#endif
+	  //Piecewise<D2<SBasis> > zz_curve = B+zaggy(B.domain(), 0.1, 20);//al*n;
+	  //Piecewise<D2<SBasis> > zz_curve = Piecewise<D2<SBasis> >(B)+
+	  //    compose(sore_tooth(Interval(al.firstValue(),al.lastValue())), al)*n;
+	  Piecewise<D2<SBasis> > zz_curve = Piecewise<D2<SBasis> >(B)+
+	      sin(al*0.1)*10*n;
+	  PathVector zz_path = path_from_piecewise(zz_curve, 0.1);
+        
+	  cairo_path(cr, zz_path*t);
+	  cairo_stroke(cr);
+	}        
+        for(const auto & i : pv) {
+            if(i.size() == 0) {
+                *notify << "naked moveto;";
+            } else 
+            for(const auto & j : i) {
+                const Curve* c = &j;
+                *notify << typeid(*c).name() << ';' ;
+            }
+        }
+
+        Toy::draw(cr, notify, width, height, save,timer_stream);
+    }
+    public:
+    BoolOps () {}
+
+    void first_time(int argc, char** argv) override {
+        const char *path_b_name="star.svgd";
+        if(argc > 1)
+            path_b_name = argv[1];
+        pv = read_svgd(path_b_name);
+        std::cout << pv.size() << "\n";
+        std::cout << pv[0].size() << "\n";
+        pv *= Translate(-pv[0].initialPoint());
+
+        Rect bounds = *pv[0].boundsExact();
+        handles.push_back(&offset_handle);
+        offset_handle.pos = bounds.midpoint() - bounds.corner(0);
+
+        //bs = cleanup(pv);
+    }
+};
+
+int main(int argc, char **argv) {
+    init(argc, argv, new BoolOps());
+    return 0;
+}
+
+/*
+  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=4:softtabstop=4:fileencoding=utf-8:textwidth=99 :