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-rw-r--r--src/3rdparty/2geom/src/toys/curvature-test.cpp110
1 files changed, 110 insertions, 0 deletions
diff --git a/src/3rdparty/2geom/src/toys/curvature-test.cpp b/src/3rdparty/2geom/src/toys/curvature-test.cpp
new file mode 100644
index 0000000..c209fe3
--- /dev/null
+++ b/src/3rdparty/2geom/src/toys/curvature-test.cpp
@@ -0,0 +1,110 @@
+#include <2geom/d2.h>
+#include <2geom/sbasis.h>
+#include <2geom/sbasis-2d.h>
+#include <2geom/bezier-to-sbasis.h>
+#include <2geom/sbasis-geometric.h>
+
+#include <toys/path-cairo.h>
+#include <toys/toy-framework-2.h>
+
+#include <time.h>
+using std::vector;
+using namespace Geom;
+using namespace std;
+
+// TODO:
+// use path2
+// replace Ray stuff with path2 line segments.
+
+//-----------------------------------------------
+
+class CurvatureTester: public Toy {
+ PointSetHandle curve_handle;
+ PointHandle sample_point;
+ void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
+
+ D2<SBasis> B = curve_handle.asBezier();
+
+ cairo_set_line_width (cr, 1);
+ cairo_set_source_rgba (cr, 0., 0.5, 0., 1);
+ cairo_d2_sb(cr, B);
+ cairo_stroke(cr);
+
+ sample_point.pos[1]=400;
+ sample_point.pos[0]=std::max(150.,sample_point.pos[0]);
+ sample_point.pos[0]=std::min(450.,sample_point.pos[0]);
+ cairo_move_to(cr, Geom::Point(150,400));
+ cairo_line_to(cr, Geom::Point(450,400));
+ cairo_set_source_rgba (cr, 0., 0., 0.5, 0.8);
+ cairo_stroke(cr);
+
+ double t=std::max(0.,std::min(1.,(sample_point.pos[0]-150)/300.));
+ Timer tm;
+ tm.ask_for_timeslice();
+ tm.start();
+
+ Piecewise<SBasis> K = curvature(B);
+ Timer::Time als_time = tm.lap();
+ *timer_stream << "curvature " << als_time << std::endl;
+
+ for(unsigned ix = 0; ix < K.segs.size(); ix++) {
+ D2<SBasis> Kxy;
+ Kxy[1] = Linear(400) - K.segs[ix]*300;
+ Kxy[0] = Linear(300*K.cuts[ix] + 150, 300*K.cuts[ix+1] + 150);
+ cairo_d2_sb(cr, Kxy);
+ cairo_stroke(cr);
+ }
+
+ double radius = K(t);
+ *notify<<"K="<<radius<<std::endl;
+ if (fabs(radius)>1e-4){
+ radius=1./radius;
+ Geom::Point normal=unit_vector(derivative(B)(t));
+ normal=rot90(normal);
+ Geom::Point center=B(t)-radius*normal;
+
+ cairo_arc(cr, center[0], center[1],fabs(radius), 0, M_PI*2);
+ draw_handle(cr, center);
+ draw_handle(cr, B(t));
+ }else{
+ Geom::Point p=B(t);
+ Geom::Point v=derivative(B)(t);
+ draw_handle(cr, p);
+ cairo_move_to(cr, p-100*v);
+ cairo_line_to(cr, p+100*v);
+ }
+ cairo_set_source_rgba (cr, 0.5, 0.2, 0., 0.8);
+ cairo_stroke(cr);
+ Toy::draw(cr, notify, width, height, save,timer_stream);
+ }
+
+public:
+ CurvatureTester(){
+ if(handles.empty()) {
+ handles.push_back(&curve_handle);
+ handles.push_back(&sample_point);
+ for(unsigned i = 0; i < 4; i++)
+ curve_handle.push_back(150+uniform()*300,150+uniform()*300);
+ sample_point.pos = Geom::Point(250,300);
+ }
+ }
+};
+
+int main(int argc, char **argv) {
+ std::cout << "testing unit_normal(multidim_sbasis) based offset." << std::endl;
+ init(argc, argv, new CurvatureTester);
+ 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:expandtab:shiftwidth = 4:tabstop = 8:softtabstop = 4:encoding = utf-8:textwidth = 99 :
+
+