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Diffstat (limited to 'src/toys/collinear-normal.cpp')
| -rw-r--r-- | src/toys/collinear-normal.cpp | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/src/toys/collinear-normal.cpp b/src/toys/collinear-normal.cpp new file mode 100644 index 0000000..a5e1af5 --- /dev/null +++ b/src/toys/collinear-normal.cpp @@ -0,0 +1,204 @@ +/* + * Show off collinear normals between two Bezier curves. + * The intersection points are found by using Bezier clipping. + * + * Authors: + * Marco Cecchetti <mrcekets at gmail.com> + * + * Copyright 2008 authors + * + * This library is free software; you can redistribute it and/or + * modify it either under the terms of the GNU Lesser General Public + * License version 2.1 as published by the Free Software Foundation + * (the "LGPL") or, at your option, under the terms of the Mozilla + * Public License Version 1.1 (the "MPL"). If you do not alter this + * notice, a recipient may use your version of this file under either + * the MPL or the LGPL. + * + * You should have received a copy of the LGPL along with this library + * in the file COPYING-LGPL-2.1; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * You should have received a copy of the MPL along with this library + * in the file COPYING-MPL-1.1 + * + * The contents of this file are subject to the Mozilla Public License + * Version 1.1 (the "License"); you may not use this file except in + * compliance with the License. You may obtain a copy of the License at + * http://www.mozilla.org/MPL/ + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY + * OF ANY KIND, either express or implied. See the LGPL or the MPL for + * the specific language governing rights and limitations. + */ + +#include <2geom/d2.h> +#include <2geom/basic-intersection.h> +#include <2geom/sbasis-to-bezier.h> +#include <2geom/ray.h> + +#include <toys/path-cairo.h> +#include <toys/toy-framework-2.h> + +using namespace Geom; + + + +class CurveIntersect : public Toy +{ + + void draw( cairo_t *cr, std::ostringstream *notify, + int width, int height, bool save, std::ostringstream *timer_stream) override + { + m_width = width; + m_height = height; + m_length = (m_width > m_height) ? m_width : m_height; + m_length *= 2; + + cairo_set_line_width (cr, 0.3); + cairo_set_source_rgba (cr, 0.8, 0., 0, 1); + D2<SBasis> A = pshA.asBezier(); + cairo_d2_sb(cr, A); + cairo_stroke(cr); + cairo_set_source_rgba (cr, 0.0, 0., 0, 1); + D2<SBasis> B = pshB.asBezier(); + cairo_d2_sb(cr, B); + cairo_stroke(cr); + draw_text(cr, A.at0(), "A"); + draw_text(cr, B.at0(), "B"); + + Timer tm; + tm.ask_for_timeslice(); + tm.start(); + + find_collinear_normal(xs, pshA.pts, pshB.pts, m_precision); + Timer::Time als_time = tm.lap(); + *timer_stream << "find_collinear_normal " << als_time << std::endl; + cairo_set_line_width (cr, 0.3); + cairo_set_source_rgba (cr, 0.0, 0.0, 0.7, 1); + for (auto & x : xs) + { + Point At = A(x.first); + Point Bu = B(x.second); + draw_axis(cr, At, Bu); + draw_handle(cr, At); + draw_handle(cr, Bu); + + } + cairo_stroke(cr); + + double h_a_t = 0, h_b_t = 0; + + double h_dist = hausdorfl( A, B, m_precision, &h_a_t, &h_b_t); + { + Point At = A(h_a_t); + Point Bu = B(h_b_t); + cairo_move_to(cr, At); + cairo_line_to(cr, Bu); + draw_handle(cr, At); + draw_handle(cr, Bu); + cairo_save(cr); + cairo_set_line_width (cr, 1); + cairo_set_source_rgba (cr, 0.7, 0.0, 0.0, 1); + cairo_stroke(cr); + cairo_restore(cr); + } + /*h_dist = hausdorf( A, B, m_precision, &h_a_t, &h_b_t); + { + Point At = A(h_a_t); + Point Bu = B(h_b_t); + draw_axis(cr, At, Bu); + draw_handle(cr, At); + draw_handle(cr, Bu); + cairo_save(cr); + cairo_set_line_width (cr, 0.3); + cairo_set_source_rgba (cr, 0.0, 0.7, 0.0, 1); + cairo_stroke(cr); + cairo_restore(cr); + }*/ + *notify << "Hausdorf distance = " << h_dist + << " occurring at " << h_a_t + << " B=" << h_b_t << std::endl; + + Toy::draw(cr, notify, width, height, save,timer_stream); + } + + void draw_segment(cairo_t* cr, Point const& p1, Point const& p2) + { + cairo_move_to(cr, p1); + cairo_line_to(cr, p2); + } + + void draw_segment(cairo_t* cr, Point const& p1, double angle, double length) + { + Point p2; + p2[X] = length * std::cos(angle); + p2[Y] = length * std::sin(angle); + p2 += p1; + draw_segment(cr, p1, p2); + } + + void draw_ray(cairo_t* cr, Ray const& r) + { + double angle = r.angle(); + draw_segment(cr, r.origin(), angle, m_length); + } + + void draw_axis(cairo_t* cr, Point const& p1, Point const& p2) + { + double d = Geom::distance(p1, p2); + d = d + d/4; + Point q1 = Ray(p1, p2).pointAt(d); + Point q2 = Ray(p2, p1).pointAt(d); + draw_segment(cr, q1, q2); + } + +public: + CurveIntersect(unsigned int _A_bez_ord, unsigned int _B_bez_ord) + : A_bez_ord(_A_bez_ord), B_bez_ord(_B_bez_ord) + { + handles.push_back(&pshA); + for (unsigned int i = 0; i <= A_bez_ord; ++i) + pshA.push_back(Geom::Point(uniform()*400, uniform()*400)+Point(200,200)); + handles.push_back(&pshB); + for (unsigned int i = 0; i <= B_bez_ord; ++i) + pshB.push_back(Geom::Point(uniform()*400, uniform()*400)+Point(200,200)); + + m_precision = 1e-6; + } + +private: + unsigned int A_bez_ord, B_bez_ord; + PointSetHandle pshA, pshB, pshC; + std::vector< std::pair<double, double> > xs; + double m_precision; + double m_width, m_height, m_length; +}; + + +int main(int argc, char **argv) +{ + unsigned int A_bez_ord = 4; + unsigned int B_bez_ord = 6; + if(argc > 1) + sscanf(argv[1], "%d", &A_bez_ord); + if(argc > 2) + sscanf(argv[2], "%d", &B_bez_ord); + + + init( argc, argv, new CurveIntersect(A_bez_ord, B_bez_ord), 800, 800); + 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 : + + |