1 files changed, 164 insertions, 0 deletions
diff --git a/src/toys/circle-fitting.cpp b/src/toys/circle-fitting.cpp
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+/*
+ * Circle and Elliptical Arc Fitting Example
+ *
+ * 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 <memory>
+#include <2geom/circle.h>
+#include <2geom/elliptical-arc.h>
+#include <2geom/numeric/fitting-tool.h>
+#include <2geom/numeric/fitting-model.h>
+
+#include <toys/path-cairo.h>
+#include <toys/toy-framework-2.h>
+
+
+using namespace Geom;
+
+
+class CircleFitting : public Toy
+{
+  private:
+    void draw( cairo_t *cr, std::ostringstream *notify,
+               int width, int height, bool save, std::ostringstream *timer_stream) override
+    {
+        if (first_time)
+        {
+            first_time = false;
+            Point toggle_sp( 300, height - 50);
+            toggles[0].bounds = Rect( toggle_sp, toggle_sp + Point(120,25) );
+            sliders[0].geometry(Point(50, height - 50), 100);
+        }
+
+        size_t n = (size_t)(sliders[0].value()) + 3;
+        if (n < psh.pts.size())
+        {
+            psh.pts.resize(n);
+        }
+        else if (n > psh.pts.size())
+        {
+            psh.push_back(400*uniform()+50, 300*uniform()+50);
+        }
+
+        try
+        {
+            c.fit(psh.pts);
+        }
+        catch(RangeError exc)
+        {
+            std::cerr << exc.what() << std::endl;
+            Toy::draw(cr, notify, width, height, save,timer_stream);
+            return;
+        }
+
+        if (toggles[0].on)
+        {
+            try
+            {
+                std::unique_ptr<EllipticalArc> eap( c.arc(psh.pts[0], psh.pts[1], psh.pts[2]) );
+                ea = *eap;
+            }
+            catch(RangeError exc)
+            {
+                std::cerr << exc.what() << std::endl;
+                Toy::draw(cr, notify, width, height, save,timer_stream);
+                return;
+            }
+        }
+
+        std::cerr << "center = " << c.center() << "  ray = " << c.radius() << std::endl;
+
+        cairo_set_source_rgba(cr, 0.3, 0.3, 0.3, 1.0);
+        cairo_set_line_width (cr, 0.3);
+        if (!toggles[0].on)
+        {
+            cairo_arc(cr, c.center(X), c.center(Y), c.radius(), 0, 2*M_PI);
+        }
+        else
+        {
+            draw_text(cr, psh.pts[0], "initial");
+            draw_text(cr, psh.pts[1], "inner");
+            draw_text(cr, psh.pts[2], "final");
+
+            D2<SBasis> easb = ea.toSBasis();
+            cairo_d2_sb(cr, easb);
+        }
+        cairo_stroke(cr);
+
+        Toy::draw(cr, notify, width, height, save,timer_stream);
+    }
+
+  public:
+    CircleFitting()
+    {
+        first_time = true;
+
+        psh.pts.resize(3);
+        psh.pts[0] = Point(450, 250);
+        psh.pts[1] = Point(250, 100);
+        psh.pts[2] = Point(250, 400);
+
+
+        toggles.emplace_back(" arc / circle ", false);
+        sliders.emplace_back(0, 5, 1, 0, "more handles");
+
+        handles.push_back(&psh);
+        handles.push_back(&(toggles[0]));
+        handles.push_back(&(sliders[0]));
+    }
+
+  private:
+    Circle c;
+    EllipticalArc ea;
+    bool first_time;
+    PointSetHandle psh;
+    std::vector<Toggle> toggles;
+    std::vector<Slider> sliders;
+};
+
+
+
+int main(int argc, char **argv)
+{
+    init( argc, argv, new CircleFitting(), 600, 600 );
+    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 :