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#include <2geom/d2.h>
#include <2geom/sbasis.h>
#include <2geom/sbasis-geometric.h>
#include <2geom/sbasis-2d.h>
#include <2geom/bezier-to-sbasis.h>
#include <2geom/transforms.h>
#include <2geom/sbasis-math.h>
#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>
#include <2geom/path.h>
#include <2geom/svg-path-parser.h>
#include <gsl/gsl_matrix.h>
#include <vector>
using std::vector;
using namespace Geom;
using namespace std;
unsigned total_pieces_sub;
unsigned total_pieces_inc;
void cairo_pw(cairo_t *cr, Piecewise<SBasis> p) {
for(unsigned i = 0; i < p.size(); i++) {
D2<SBasis> B;
B[0] = Linear(p.cuts[i], p.cuts[i+1]);
B[1] = p[i];
cairo_d2_sb(cr, B);
}
}
void draw_line(cairo_t* cr, Geom::Point n, double d) {
cairo_move_to(cr, d*n + rot90(n)*1000);
cairo_line_to(cr, d*n - rot90(n)*1000);
cairo_move_to(cr, d*n);
cairo_line_to(cr, (d+10)*n);
}
class InnerProductClip: public Toy {
Path path_a;
Piecewise<D2<SBasis> > path_a_pw;
std::vector<Toggle> togs;
PointHandle start_handle, end_handle;
void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
cairo_set_source_rgba (cr, 0., 0.125, 0, 1);
D2<Piecewise<SBasis> > B = make_cuts_independent(path_a_pw);
Point n;
double d;
{
double x = width - 60, y = height - 60;
Point p(x, y), dpoint(25,25), xo(25,0), yo(0,25);
togs[0].bounds = Rect(p, p + dpoint);
togs[1].bounds = Rect(p + xo, p + xo + dpoint);
draw_toggles(cr, togs);
}
if(togs[0].on) {
d = L2(end_handle.pos - start_handle.pos);
cairo_save(cr);
cairo_set_line_width(cr, 0.3);
cairo_new_sub_path(cr);
cairo_arc(cr, start_handle.pos[0], start_handle.pos[1], d, 0, M_PI*2);
cairo_stroke(cr);
cairo_restore(cr);
} else {
n = unit_vector(rot90(end_handle.pos - start_handle.pos));
d = dot(n, start_handle.pos);
draw_line(cr, n, d);
}
//printf("%g\n", d);
vector<double> all_roots;
for(unsigned i = 0; i <= path_a.size(); i++) {
//deriv = p[i].derivative();
D2<SBasis> curpw = path_a[i].toSBasis();
SBasis inner;
if(togs[0].on) {
D2<SBasis> test = curpw - start_handle.pos;
inner = test[0]*test[0] + test[0]*test[1] + 2*test[1]*test[1] - d*d;
} else {
inner = n[0]*curpw[0] + n[1]*curpw[1] - d;
}
vector<double> lr = roots(inner);
all_roots.insert(all_roots.end(), lr.begin(), lr.end());
for(double i : lr)
draw_handle(cr, curpw(i));
sort(lr.begin(), lr.end());
lr.insert(lr.begin(), 0);
lr.insert(lr.end(), 1);
Path out;
for(unsigned j = 0; j < lr.size()-1; j++) {
//Point s = curpw(lr[j]);
Point m = curpw((lr[j] + lr[j+1])/2);
if(togs[0].on)
m -= start_handle.pos;
//Point e = curpw(lr[j+1]);
double dd;
if(togs[0].on)
//dd = dot(m, m) - d*d;
dd = m[0]*m[0] + m[0]*m[1] + 2*m[1]*m[1] - d*d;
else
dd = dot(n, m) - d;
if(togs[1].on)
dd = -dd;
//printf("%d [%g, %g] %g (%g, %g) (%g, %g)\n",
// i, lr[j], lr[j+1], dd, s[0], s[1], e[0], e[1]);
if(0 > dd) {
//Curve * cv = path_a[i].portion(lr[j], lr[j+1]);
cairo_d2_sb(cr, portion(curpw, lr[j], lr[j+1]));
cairo_set_source_rgba (cr, 0., 0.125, 0, 1);
cairo_stroke(cr);
/*cairo_curve(cr, path_a[i]);
cairo_set_source_rgba (cr, 0., 0.125, 0, 1);
cairo_stroke(cr);*/
}
}
}
//cairo_pw_d2_sb(cr, path_a_pw);
cairo_set_source_rgba (cr, 0., 0.125, 0, 1);
cairo_stroke(cr);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
void key_hit(GdkEventKey *e) override {
if(e->keyval == 's') togs[1].toggle(); else
if(e->keyval == 'c') togs[0].toggle();
redraw();
}
void mouse_pressed(GdkEventButton* e) override {
toggle_events(togs, e);
Toy::mouse_pressed(e);
}
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.size() > 0);
path_a = paths_a[0];
path_a.close(true);
path_a_pw = path_a.toPwSb();
// Finite images of the three vanishing points and the origin
handles.push_back(&start_handle);
handles.push_back(&end_handle);
togs.emplace_back("C", true);
togs.emplace_back("S", true);
}
public:
InnerProductClip() : start_handle(150,300),
end_handle(380,40) {}
};
int main(int argc, char **argv) {
init(argc, argv, new InnerProductClip);
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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