Sync 2Geom to revision 2413.

May introduce regressions.

(bzr r14226)

1 files changed, 133 insertions, 0 deletions

diff --git a/src/2geom/viewbox.cpp b/src/2geom/viewbox.cpp
new file mode 100644
index 000000000..69bd0c487
--- /dev/null
+++ b/src/2geom/viewbox.cpp
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+/**
+ * \file
+ * \brief Convenience class for SVG viewBox handling
+ *//*
+ *  Authors:
+ *    Krzysztof Kosiński <tweenk.pl@gmail.com>
+ *
+ * Copyright (C) 2013 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/transforms.h>
+#include <2geom/viewbox.h>
+
+namespace Geom {
+
+/** Convert an align specification to coordinate fractions. */
+Point align_factors(Align g) {
+    Point p;
+    switch (g) {
+    case ALIGN_XMIN_YMIN:
+        p[X] = 0.0;
+        p[Y] = 0.0;
+        break;
+    case ALIGN_XMID_YMIN:
+        p[X] = 0.5;
+        p[Y] = 0.0;
+        break;
+    case ALIGN_XMAX_YMIN:
+        p[X] = 1.0;
+        p[Y] = 0.0;
+        break;
+    case ALIGN_XMIN_YMID:
+        p[X] = 0.0;
+        p[Y] = 0.5;
+        break;
+    case ALIGN_XMID_YMID:
+        p[X] = 0.5;
+        p[Y] = 0.5;
+        break;
+    case ALIGN_XMAX_YMID:
+        p[X] = 1.0;
+        p[Y] = 0.5;
+        break;
+    case ALIGN_XMIN_YMAX:
+        p[X] = 0.0;
+        p[Y] = 1.0;
+        break;
+    case ALIGN_XMID_YMAX:
+        p[X] = 0.5;
+        p[Y] = 1.0;
+        break;
+    case ALIGN_XMAX_YMAX:
+        p[X] = 1.0;
+        p[Y] = 1.0;
+        break;
+    default:
+        break;
+    }
+    return p;
+}
+
+/** Obtain transformation from the viewbox to the specified viewport. */
+Affine ViewBox::transformTo(Geom::Rect const &viewport) const
+{
+    if (!_box) {
+        return Geom::Affine::identity();
+    }
+
+    // 1. translate viewbox to origin
+    Geom::Affine total = Translate(-_box->min());
+
+    // 2. compute scale
+    Geom::Point vdims = viewport.dimensions();
+    Geom::Point bdims = _box->dimensions();
+    Geom::Scale scale(vdims[X] / bdims[X], vdims[Y] / bdims[Y]);
+
+    if (_align == ALIGN_NONE) {
+        // apply non-uniform scale
+        // = Scale(_box->dimensions()).inverse() * Scale(viewport.dimensions())
+        total *= scale * Translate(viewport.min());
+    } else {
+        double uscale = 0;
+        if (_expansion == EXPANSION_MEET) {
+            uscale = std::min(scale[X], scale[Y]);
+        } else {
+            uscale = std::max(scale[X], scale[Y]);
+        }
+        scale = Scale(uscale);
+
+        // compute offset for align
+        Geom::Point offset = bdims * scale - vdims;
+        offset *= Scale(align_factors(_align));
+        total *= Translate(-offset);
+    }
+
+    return total;
+}
+
+} // namespace Geom
+
+/*
+  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 :