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Diffstat (limited to 'src/toys/parametrics.cpp')
| -rw-r--r-- | src/toys/parametrics.cpp | 229 |
1 files changed, 229 insertions, 0 deletions
diff --git a/src/toys/parametrics.cpp b/src/toys/parametrics.cpp new file mode 100644 index 0000000..2d2538c --- /dev/null +++ b/src/toys/parametrics.cpp @@ -0,0 +1,229 @@ +#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 <2geom/path.h> +#include <2geom/svg-path-parser.h> +#include <2geom/sbasis-math.h> + +#include <toys/path-cairo.h> +#include <toys/toy-framework-2.h> +#include <2geom/affine.h> + +#include <glib.h> +#include <vector> +#include <iostream> +using std::vector; +using namespace Geom; + +int mode; + +static void dot_plot(cairo_t *cr, Piecewise<D2<SBasis> > const &M, double max, double space=10){ + Piecewise<D2<SBasis> > Mperp = rot90(derivative(M)) * 3; + for( double t = M.cuts.front(); t < max; t += space) { + Point pos = M(t), perp = Mperp(t); + draw_line_seg(cr, pos + perp, pos - perp); + } + cairo_stroke(cr); +} + +static void draw_axis(cairo_t *cr, Piecewise<D2<SBasis> > const &pw, unsigned d, Affine m) { + double mult; + if(abs(mode)==1) mult = 20; + if(abs(mode)==2) mult = 1; + if(abs(mode)==3) mult = 100; + if(abs(mode)==4) mult = 20; + if(abs(mode)==5) mult = 20; + if(abs(mode)==6) mult = 100; + for(unsigned i = 0; i < pw.size(); i++) { + cairo_d2_sb(cr, D2<SBasis>(SBasis(pw.cuts[i]-pw.cuts[0], pw.cuts[i+1]-pw.cuts[0])*mult, SBasis(pw[i][d]))*m); + } +} +/* +void dump_latex(PathVector ps) { + for(unsigned d = 0; d < 2; d++) { + std::cout << "$$\n" << (d?"y":"x") << "(t) = \\left\\{\n\\begin{array}{ll}\n"; + int seg = 0; + for(unsigned i = 0; i < ps.size(); i++) + for(unsigned j = 0; j < ps[i].size(); j++) { + Bezier<3> &b = dynamic_cast<Bezier<3>& >(const_cast<Curve&>(ps[i][j])); + std::cout << b[0][d] << "(" << seg+1 << "-t)^3 + " + << 3*b[1][d] << "t(" << seg+1 << "-t)^2 + " + << 3*b[2][d] << "t^2(" << seg+1 << "-t) + " + << b[3][d] << "t^3,& " << seg << "\\leq t < " << seg+1 << "\\\\\n"; + seg++; + } + std::cout << "\\end{array}\n$$\n"; + } +} +*/ +class Parametrics: public Toy { + Piecewise<D2<SBasis> > cat, alcat, box, arc, monk, traj; +#ifdef USE_TIME + GTimer* time; + bool st; +#endif + double waitt; + double t; + int count; + void draw(cairo_t *cr, + std::ostringstream *notify, + int width, int height, bool save, std::ostringstream *timer_stream) override { + //double t = handles[0][0] / 20.; + +#ifdef USE_TIME + gulong* foo = 0; + t = g_timer_elapsed(time, foo) * 100; +#else + double inc; + if(mode==1) inc = .1; + if(mode==2) inc = 5; + if(mode==3) inc = .01; + if(mode==4) inc = .04; + if(mode==5) inc = .1; + if(mode==6) inc = .01; + if(mode<0) inc = .01*M_PI; + if(!save && !waitt) { + t += inc; + } + if(waitt) waitt += 1; + if(waitt>20) waitt = 0; +#endif + Piecewise<D2<SBasis> > obj; + if(abs(mode)==1) obj = cat; + if(abs(mode)==2) obj = alcat; + if(abs(mode)==3) obj = arc; + if(abs(mode)==4) obj = box; + if(abs(mode)==5) obj = monk; + if(abs(mode)==6) obj = traj; + if(t==obj.cuts.back()) t += inc/2; + cairo_set_source_rgb(cr, 1,1,1); + if(save) { + cairo_rectangle(cr, 0, 0, width, height); + cairo_fill(cr); + } + Piecewise<D2<SBasis> > port, rport; + if(mode>0) { + port = portion(obj, 0, t); + rport = mode>0? portion(obj, t, obj.cuts[obj.size()]) : obj; + cairo_set_source_rgba (cr, 0., 0., 0., 1); + Point curpt = rport[0].at0(); + if(t<obj.cuts.back()) { + draw_line_seg(cr, curpt, Point(curpt[0], 350)); + draw_line_seg(cr, curpt, Point(350, curpt[1])); + cairo_stroke(cr); + } + + char tlab[64]; + sprintf(tlab, "t=%.02f", t); + draw_text(cr, curpt, tlab , true); + + cairo_set_line_width (cr, 2); + cairo_set_source_rgba (cr, 0., 0.5, 0., 1); + cairo_pw_d2_sb(cr, port); + cairo_stroke(cr); + } + if(mode>=0 && t>=obj.cuts.back()+inc) t = 0; + cairo_set_source_rgba (cr, 0.9, 0., 0., 1); + if(mode<0) { + draw_axis(cr, obj, 0, from_basis(Point(cos(t),sin(t)),Point(sin(t),-cos(t)),Point(0, 350))); + if(cos(t) <= 0) { + mode = -mode; + t = 0; + waitt = 1; + } + } else + draw_axis(cr, rport, 0, from_basis(Point(0,1),Point(1,0),Point(0, 350))); + cairo_stroke(cr); + + cairo_set_source_rgba (cr, 0., 0., 0.9, 1); + if(mode<0) + draw_axis(cr, obj, 1, from_basis(Point(1,0),Point(0,1),Point(350*t/M_PI*2, 0))); + else + draw_axis(cr, rport, 1, from_basis(Point(1,0),Point(0,1),Point(350, 0))); + cairo_stroke(cr); + + if(mode==2 && t>0) { + cairo_set_line_width (cr, 1); + cairo_set_source_rgba (cr, 0., 0., 0.9, 1); + dot_plot(cr, port, t); + cairo_stroke(cr); + } + + if(!save) { + char file[100]; + sprintf(file, "output/%04d.png", count); + //take_screenshot(file); + count++; + } + // *notify << "pieces = " << alcat.size() << ";\n"; + + Toy::draw(cr, notify, width, height, save,timer_stream); + redraw(); + } + +#ifdef USE_TIME + virtual void mouse_moved(GdkEventMotion* e) { + if(st) { + g_timer_start(time); + st = false; + } + Toy::mouse_moved(e); + } +#endif + + public: + Parametrics(){ + mode = 2; + PathVector cp = read_svgd("cat.svgd"); + //dump_latex(cp); + cat = paths_to_pw(cp); + cat *= .3; + cat += Point(50, 50); + alcat = arc_length_parametrization(cat); + + monk = paths_to_pw(read_svgd("monkey.svgd")); + //monk *= .3; + monk += Point(50,50); + + arc = sectionize(D2<Piecewise<SBasis> >(cos(Linear(0,M_PI))*120, sin(Linear(0,M_PI))*-120)); + arc += Point(200, 200); + + box = Piecewise<D2<SBasis> >(); + box.push_cut(0); + box.push(D2<SBasis>(SBasis(100.,300.), SBasis(100.)), 1); + box.push(D2<SBasis>(SBasis(300.), SBasis(100.,300.)), 2); + box.push(D2<SBasis>(SBasis(300.,100.), SBasis(300.)), 3); + box.push(D2<SBasis>(SBasis(100.), SBasis(300.,100.)), 4); + //handles.push_back(Point(100, 100)); + traj = Piecewise<D2<SBasis> >(); + SBasis quad = Linear(0,1)*Linear(0,1)*256-Linear(0,256)+200; + traj.push_cut(0); + traj.push(D2<SBasis>(SBasis(100.,300.),SBasis(quad)), 1); +#ifdef USE_TIME + time = g_timer_new(); + g_timer_reset(time); + st = true; +#endif + waitt = 0; + count = 0; + t = 0; + } +}; + +int main(int argc, char **argv) { + init(argc, argv, new Parametrics, 720, 480); + 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: |