Adding upstream version 1.0.2.upstream/1.0.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 167 insertions, 0 deletions

diff --git a/src/2geom/linear.h b/src/2geom/linear.h
new file mode 100644
index 0000000..75c6e01
--- /dev/null
+++ b/src/2geom/linear.h
@@ -0,0 +1,167 @@
+/**
+ * \file
+ * \brief  Linear fragment function class
+ *//*
+ *  Authors:
+ *   Nathan Hurst <njh@mail.csse.monash.edu.au>
+ *   Michael Sloan <mgsloan@gmail.com>
+ *   Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2006-2015 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_LINEAR_H
+#define LIB2GEOM_SEEN_LINEAR_H
+
+#include <2geom/interval.h>
+#include <2geom/math-utils.h>
+
+namespace Geom {
+
+class SBasis;
+
+/**
+ * @brief Function that interpolates linearly between two values.
+ * @ingroup Fragments
+ */
+class Linear
+    : boost::additive< Linear
+    , boost::arithmetic< Linear, Coord
+    , boost::equality_comparable< Linear
+      > > >
+{
+public:
+    Coord a[2];
+    Linear() {a[0]=0; a[1]=0;}
+    Linear(Coord aa, Coord b) {a[0] = aa; a[1] = b;}
+    Linear(Coord aa) {a[0] = aa; a[1] = aa;}
+
+    Coord operator[](unsigned i) const {
+        assert(i < 2);
+        return a[i];
+    }
+    Coord &operator[](unsigned i) {
+        assert(i < 2);
+        return a[i];
+    }
+
+    //IMPL: FragmentConcept
+    typedef Coord output_type;
+    bool isZero(Coord eps=EPSILON) const { return are_near(a[0], 0., eps) && are_near(a[1], 0., eps); }
+    bool isConstant(Coord eps=EPSILON) const { return are_near(a[0], a[1], eps); }
+    bool isFinite() const { return std::isfinite(a[0]) && std::isfinite(a[1]); }
+
+    Coord at0() const { return a[0]; }
+    Coord &at0() { return a[0]; }
+    Coord at1() const { return a[1]; }
+    Coord &at1() { return a[1]; }
+
+    Coord valueAt(Coord t) const { return lerp(t, a[0], a[1]); }
+    Coord operator()(Coord t) const { return valueAt(t); }
+
+    // not very useful, but required for FragmentConcept
+    std::vector<Coord> valueAndDerivatives(Coord t, unsigned n) {
+        std::vector<Coord> result(n+1, 0.0);
+        result[0] = valueAt(t);
+        if (n >= 1) {
+            result[1] = a[1] - a[0];
+        }
+        return result;
+    }
+
+    //defined in sbasis.h
+    inline SBasis toSBasis() const;
+
+    OptInterval bounds_exact() const { return Interval(a[0], a[1]); }
+    OptInterval bounds_fast() const { return bounds_exact(); }
+    OptInterval bounds_local(double u, double v) const { return Interval(valueAt(u), valueAt(v)); }
+
+    double tri() const {
+        return a[1] - a[0];
+    }
+    double hat() const {
+        return (a[1] + a[0])/2;
+    }
+
+    // addition of other Linears
+    Linear &operator+=(Linear const &other) {
+        a[0] += other.a[0];
+        a[1] += other.a[1];
+        return *this;
+    }
+    Linear &operator-=(Linear const &other) {
+        a[0] -= other.a[0];
+        a[1] -= other.a[1];
+        return *this;
+    }
+
+    // 
+    Linear &operator+=(Coord x) {
+        a[0] += x; a[1] += x;
+        return *this;
+    }
+    Linear &operator-=(Coord x) {
+        a[0] -= x; a[1] -= x;
+        return *this;
+    }
+    Linear &operator*=(Coord x) {
+        a[0] *= x; a[1] *= x;
+        return *this;
+    }
+    Linear &operator/=(Coord x) {
+        a[0] /= x; a[1] /= x;
+        return *this;
+    }
+    Linear operator-() const {
+        Linear ret(-a[0], -a[1]);
+        return ret;
+    }
+
+    bool operator==(Linear const &other) const {
+        return a[0] == other.a[0] && a[1] == other.a[1];
+    }
+};
+
+inline Linear reverse(Linear const &a) { return Linear(a[1], a[0]); }
+inline Linear portion(Linear const &a, Coord from, Coord to) {
+    Linear result(a.valueAt(from), a.valueAt(to));
+    return result;
+}
+
+} // end namespace Geom
+
+#endif //LIB2GEOM_SEEN_LINEAR_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 :