1 files changed, 128 insertions, 0 deletions
diff --git a/src/toys/2dsb2d.cpp b/src/toys/2dsb2d.cpp
new file mode 100644
index 0000000..3effd1f
--- /dev/null
+++ b/src/toys/2dsb2d.cpp
@@ -0,0 +1,128 @@
+#include <2geom/d2.h>
+#include <2geom/sbasis.h>
+#include <2geom/sbasis-2d.h>
+#include <2geom/bezier-to-sbasis.h>
+#include <2geom/transforms.h>
+#include <2geom/pathvector.h>
+#include <2geom/svg-path-parser.h>
+
+#include <toys/path-cairo.h>
+#include <toys/toy-framework-2.h>
+
+#include <vector>
+using std::vector;
+using namespace Geom;
+
+unsigned total_pieces_sub;
+unsigned total_pieces_inc;
+
+class Sb2d2: public Toy {
+    Path path_a;
+    D2<SBasis2d> sb2;
+    Piecewise<D2<SBasis> >  path_a_pw;
+    PointSetHandle hand;
+    
+    void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
+        Geom::Point dir(1,-2);
+        for(unsigned dim = 0; dim < 2; dim++) {
+            Geom::Point dir(0,0);
+            dir[dim] = 1;
+            for(unsigned vi = 0; vi < sb2[dim].vs; vi++)
+                for(unsigned ui = 0; ui < sb2[dim].us; ui++)
+                    for(unsigned iv = 0; iv < 2; iv++)
+                        for(unsigned iu = 0; iu < 2; iu++) {
+                            unsigned corner = iu + 2*iv;
+                            unsigned i = ui + vi*sb2[dim].us;
+                            Geom::Point base((2*(iu+ui)/(2.*ui+1)+1)*width/4.,
+                                             (2*(iv+vi)/(2.*vi+1)+1)*width/4.);
+                            if(vi == 0 && ui == 0) {
+                                base = Geom::Point(width/4., width/4.);
+                            }
+                            double dl = dot((hand.pts[corner+4*i] - base), dir)/dot(dir,dir);
+                            sb2[dim][i][corner] = dl/(width/2)*pow(4.0,(double)ui+vi);
+                        }
+        }
+        cairo_d2_sb2d(cr, sb2, dir*0.1, width);
+        cairo_set_source_rgba (cr, 0., 0., 0, 0.5);
+        cairo_stroke(cr);
+        for(unsigned i = 0; i < path_a_pw.size(); i++) {
+            D2<SBasis> B = path_a_pw[i];
+            //const int depth = sb2[0].us*sb2[0].vs;
+            //const int surface_hand.pts = 4*depth;
+            //D2<SBasis> B = hand.pts_to_sbasis<3>(hand.pts.begin() + surface_hand.pts);
+            cairo_d2_sb(cr, B);
+            for(unsigned dim = 0; dim < 2; dim++) {
+                std::vector<double> r = roots(B[dim]);
+                for(double i : r)
+                    draw_cross(cr, B(i));
+                r = roots(Linear(width/4) - B[dim]);
+                for(double i : r)
+                    draw_cross(cr, B(i));
+            }
+            cairo_set_source_rgba (cr, 0., 0.125, 0, 1);
+            cairo_stroke(cr);
+            B *= (4./width);
+            D2<SBasis> tB = compose_each(sb2, B);
+            B = B*(width/2) + Geom::Point(width/4, width/4);
+            tB = tB*(width/2) + Geom::Point(width/4, width/4);
+            
+            cairo_d2_sb(cr, tB);
+        }
+        
+        //*notify << "bo = " << sb2.index(0,0);
+
+        Toy::draw(cr, notify, width, height, save,timer_stream);
+    }
+    void first_time(int argc, char** argv) override {
+        const char *path_a_name="star.svgd";
+        if(argc > 1)
+            path_a_name = argv[1];
+        PathVector paths_a = read_svgd(path_a_name);
+        assert(!paths_a.empty());
+        path_a = paths_a[0];
+        Rect bounds = path_a[0].boundsFast();
+        std::cout << bounds.min() <<std::endl;
+        path_a = path_a * Affine(Translate(-bounds.min()));
+        double extreme = std::max(bounds.width(), bounds.height());
+        path_a = path_a * Scale(40./extreme);
+        
+        path_a_pw = path_a.toPwSb();
+        for(unsigned dim = 0; dim < 2; dim++) {
+            sb2[dim].us = 2;
+            sb2[dim].vs = 2;
+            const int depth = sb2[dim].us*sb2[dim].vs;
+            sb2[dim].resize(depth, Linear2d(0));
+        }
+        
+        hand.pts.resize(sb2[0].vs*sb2[0].us*4);
+        handles.push_back(&hand);
+        
+    }
+    void resize_canvas(Geom::Rect const & s) override {
+        double width = s[0].extent();
+        unsigned ii = 0;
+        for(unsigned vi = 0; vi < sb2[0].vs; vi++)
+            for(unsigned ui = 0; ui < sb2[0].us; ui++)
+                for(unsigned iv = 0; iv < 2; iv++)
+                    for(unsigned iu = 0; iu < 2; iu++)
+                        hand.pts[ii++] = Geom::Point((2*(iu+ui)/(2.*ui+1)+1)*width/4.,
+                                                    (2*(iv+vi)/(2.*vi+1)+1)*width/4.);
+        
+    }
+};
+
+int main(int argc, char **argv) {
+    init(argc, argv, new Sb2d2);
+    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=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :