1 files changed, 165 insertions, 0 deletions
diff --git a/src/2geom/circle.h b/src/2geom/circle.h
new file mode 100644
index 0000000..a4d5f20
--- /dev/null
+++ b/src/2geom/circle.h
@@ -0,0 +1,165 @@
+/** @file
+ * @brief Circle shape
+ *//*
+ * Authors:
+ *   Marco Cecchetti <mrcekets at gmail.com>
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright 2008-2014 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.
+ */
+
+#ifndef LIB2GEOM_SEEN_CIRCLE_H
+#define LIB2GEOM_SEEN_CIRCLE_H
+
+#include <2geom/forward.h>
+#include <2geom/intersection.h>
+#include <2geom/point.h>
+#include <2geom/rect.h>
+#include <2geom/transforms.h>
+
+namespace Geom {
+
+class EllipticalArc;
+
+/** @brief Set of all points at a fixed distance from the center
+ * @ingroup Shapes */
+class Circle
+    : boost::equality_comparable1< Circle
+    , MultipliableNoncommutative< Circle, Translate
+    , MultipliableNoncommutative< Circle, Rotate
+    , MultipliableNoncommutative< Circle, Zoom
+      > > > >
+{
+    Point _center;
+    Coord _radius;
+
+public:
+    Circle() {}
+    Circle(Coord cx, Coord cy, Coord r)
+        : _center(cx, cy), _radius(r)
+    {}
+    Circle(Point const &center, Coord r)
+        : _center(center), _radius(r)
+    {}
+
+    Circle(Coord A, Coord B, Coord C, Coord D) {
+        setCoefficients(A, B, C, D);
+    }
+
+    // Construct the unique circle passing through three points.
+    //Circle(Point const &a, Point const &b, Point const &c);
+
+    Point center() const { return _center; }
+    Coord center(Dim2 d) const { return _center[d]; }
+    Coord radius() const { return _radius; }
+    Coord area() const { return M_PI * _radius * _radius; }
+    bool isDegenerate() const { return _radius == 0; }
+
+    void setCenter(Point const &p) { _center = p; }
+    void setRadius(Coord c) { _radius = c; }
+
+    Rect boundsFast() const;
+    Rect boundsExact() const { return boundsFast(); }
+
+    Point initialPoint() const;
+    Point finalPoint() const { return initialPoint(); }
+    Point pointAt(Coord t) const;
+    Coord valueAt(Coord t, Dim2 d) const;
+    Coord timeAt(Point const &p) const;
+    Coord nearestTime(Point const &p) const;
+
+    bool contains(Point const &p) const { return distance(p, _center) <= _radius; }
+    bool contains(Rect const &other) const;
+    bool contains(Circle const &other) const;
+
+    bool intersects(Line const &l) const;
+    bool intersects(LineSegment const &l) const;
+    bool intersects(Circle const &other) const;
+
+    std::vector<ShapeIntersection> intersect(Line const &other) const;
+    std::vector<ShapeIntersection> intersect(LineSegment const &other) const;
+    std::vector<ShapeIntersection> intersect(Circle const &other) const;
+
+    // build a circle by its implicit equation:
+    // Ax^2 + Ay^2 + Bx + Cy + D = 0
+    void setCoefficients(Coord A, Coord B, Coord C, Coord D);
+    void coefficients(Coord &A, Coord &B, Coord &C, Coord &D) const;
+    std::vector<Coord> coefficients() const;
+
+    Zoom unitCircleTransform() const;
+    Zoom inverseUnitCircleTransform() const;
+
+    EllipticalArc *
+    arc(Point const& initial, Point const& inner, Point const& final) const;
+
+    D2<SBasis> toSBasis() const;
+
+    Circle &operator*=(Translate const &t) {
+        _center *= t;
+        return *this;
+    }
+    Circle &operator*=(Rotate const &) {
+        return *this;
+    }
+    Circle &operator*=(Zoom const &z) {
+        _center *= z;
+        _radius *= z.scale();
+        return *this;
+    }
+
+    bool operator==(Circle const &other) const;
+
+    /** @brief Fit the circle to the passed points using the least squares method.
+     * @param points Samples at the perimeter of the circle */
+    void fit(std::vector<Point> const &points);
+};
+
+bool are_near(Circle const &a, Circle const &b, Coord eps=EPSILON);
+
+std::ostream &operator<<(std::ostream &out, Circle const &c);
+
+template <>
+struct ShapeTraits<Circle> {
+    typedef Coord TimeType;
+    typedef Interval IntervalType;
+    typedef Ellipse AffineClosureType;
+    typedef Intersection<> IntersectionType;
+};
+
+} // end namespace Geom
+
+#endif // LIB2GEOM_SEEN_CIRCLE_H
+
+/*
+  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 :