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#include <2geom/basic-intersection.h>
#include <2geom/d2.h>
#include <2geom/sbasis.h>
#include <2geom/bezier-to-sbasis.h>
#include <2geom/path-intersection.h>
#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>
using std::vector;
using namespace Geom;
class PairIntersect: public Toy {
PointSetHandle A_handles;
PointSetHandle B_handles;
std::vector<Toggle> toggles;
void mouse_pressed(GdkEventButton* e) override {
toggle_events(toggles, e);
Toy::mouse_pressed(e);
}
void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
draw_toggles(cr, toggles);
cairo_save(cr);
cairo_set_source_rgba(cr, 0, 0, 0, 1.0);
cairo_set_line_width (cr, 0.5);
D2<SBasis> A = A_handles.asBezier();
cairo_d2_sb(cr, A);
cairo_stroke(cr);
cairo_set_source_rgba(cr, 0.0, 0, 0.8, 1.0);
cairo_set_line_width (cr, 0.5);
D2<SBasis> B = B_handles.asBezier();
cairo_d2_sb(cr, B);
cairo_stroke(cr);
cairo_save(cr);
cairo_set_source_rgba(cr, 0, 0, 0, 1.0);
cairo_set_line_width (cr, 0.5);
SBasis crs (cross(A - A(0), derivative(A)));
crs = shift(crs*Linear(-1, 0)*Linear(-1, 0), -2);
crs = crs * (300/(*bounds_exact(crs)).extent());
vector<double> rts = roots(crs);
for(double t : rts) {
cairo_move_to(cr, A(0));
cairo_line_to(cr, A(t));
cairo_stroke(cr);
}
cairo_restore(cr);
cairo_move_to(cr, 0, 300);
cairo_line_to(cr, width, 300);
crs += 300;
D2<SBasis > are_graph(SBasis(Linear(0, width)), crs );
cairo_save(cr);
cairo_d2_sb(cr, are_graph);
cairo_set_line_width (cr, .5);
cairo_set_source_rgba (cr, 0., 0., 0., 1);
cairo_stroke(cr);
cairo_restore(cr);
Path PB;
PB.append(B);
Path PA;
PA.append(A);
if (toggles[0].on) {
PathVector ps;
ps.push_back(PA);
ps.push_back(PB);
CrossingSet cs = crossings_among(ps);
*notify << "total intersections: " << cs.size() << '\n';
cairo_stroke(cr);
cairo_set_source_rgba (cr, 1., 0., 0, 0.8);
for(unsigned i = 0; i < cs.size(); i++) {
Crossings section = cs[i];
*notify << "section " << i << ": " << section.size() << '\n';
for(auto & j : section) {
draw_handle(cr, A(j.ta));
*notify << Geom::distance(A(j.ta), B(j.tb))
<< std::endl;
}
}
cairo_stroke(cr);
} else {
vector<Geom::Point> Ab = A_handles.pts, Bb = B_handles.pts;
std::vector<std::pair<double, double> > section;
find_intersections( section, A, B);
std::vector<std::pair<double, double> > polished_section = section;
*notify << "total intersections: " << section.size();
polish_intersections( polished_section, A, B);
cairo_stroke(cr);
cairo_set_source_rgba (cr, 1., 0., 0, 0.8);
for(unsigned i = 0; i < section.size(); i++) {
draw_handle(cr, A(section[i].first));
*notify << Geom::distance(A(section[i].first), B(section[i].second))
<< " polished "
<< Geom::distance(A(polished_section[i].first), B(polished_section[i].second))
<< std::endl;
}
cairo_stroke(cr);
}
cairo_restore(cr);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
public:
PairIntersect (unsigned A_bez_ord, unsigned B_bez_ord) {
toggles.emplace_back("Path", true);
toggles[0].bounds = Rect(Point(10,100), Point(100, 130));
//toggles.push_back(Toggle("Curve", true));
//toggles[1].bounds = Rect(Point(10,130), Point(100, 160));
handles.push_back(&A_handles);
handles.push_back(&B_handles);
A_handles.name = "A";
B_handles.name = "B";
for(unsigned i = 0; i < A_bez_ord; i++)
A_handles.push_back(uniform()*400, uniform()*400);
for(unsigned i = 0; i < B_bez_ord; i++)
B_handles.push_back(uniform()*400, uniform()*400);
}
};
int main(int argc, char **argv) {
unsigned A_bez_ord=10;
unsigned B_bez_ord=3;
if(argc > 2)
sscanf(argv[2], "%d", &B_bez_ord);
if(argc > 1)
sscanf(argv[1], "%d", &A_bez_ord);
init(argc, argv, new PairIntersect(A_bez_ord, B_bez_ord));
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 :
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