1 files changed, 127 insertions, 0 deletions
diff --git a/src/3rdparty/2geom/src/toys/curve-intersection-by-bezier-clipping.cpp b/src/3rdparty/2geom/src/toys/curve-intersection-by-bezier-clipping.cpp
new file mode 100644
index 0000000..dfd0a56
--- /dev/null
+++ b/src/3rdparty/2geom/src/toys/curve-intersection-by-bezier-clipping.cpp
@@ -0,0 +1,127 @@
+/*
+ * Show off crossings 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 <toys/path-cairo.h>
+#include <toys/toy-framework-2.h>
+
+#include <2geom/d2.h>
+#include <2geom/basic-intersection.h>
+#include <2geom/sbasis-to-bezier.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
+    {
+        cairo_set_line_width (cr, 0.3);
+        cairo_set_source_rgba (cr, 0.8, 0., 0, 1);
+        //pshA.pts.back() = pshB.pts[0];
+        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);
+
+        find_intersections_bezier_clipping(xs, pshA.pts, pshB.pts, m_precision);
+        cairo_set_line_width (cr, 0.3);
+        cairo_set_source_rgba (cr, 0.0, 0.0, 0.7, 1);
+        for (auto & x : xs)
+        {
+            draw_handle(cr, A(x.first));
+            draw_handle(cr, B(x.second));
+        }
+        cairo_stroke(cr);
+
+        Toy::draw(cr, notify, width, height, save,timer_stream);
+    }
+
+
+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;
+};
+
+
+int main(int argc, char **argv)
+{
+    unsigned int A_bez_ord = 6;
+    unsigned int B_bez_ord = 8;
+    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 :
+
+