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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <config_options.h>
+#include <basegfx/polygon/b2dpolygon.hxx>
+#include <vector>
+#include <basegfx/basegfxdllapi.h>
+
+
+namespace basegfx { class B2DPolyPolygon; }
+namespace basegfx { class B2DPoint; }
+
+namespace basegfx
+{
+ // class to hold a single trapezoid
+ class UNLESS_MERGELIBS(BASEGFX_DLLPUBLIC) B2DTrapezoid
+ {
+ private:
+ // Geometry data. YValues are down-oriented, this means bottom should
+ // be bigger than top to be below it. The constructor implementation
+ // guarantees:
+
+ // - mfBottomY >= mfTopY
+ // - mfTopXRight >= mfTopXLeft
+ // - mfBottomXRight >= mfBottomXLeft
+ double mfTopXLeft;
+ double mfTopXRight;
+ double mfTopY;
+ double mfBottomXLeft;
+ double mfBottomXRight;
+ double mfBottomY;
+
+ public:
+ // constructor
+ B2DTrapezoid(
+ const double& rfTopXLeft,
+ const double& rfTopXRight,
+ const double& rfTopY,
+ const double& rfBottomXLeft,
+ const double& rfBottomXRight,
+ const double& rfBottomY);
+
+ // data read access
+ const double& getTopXLeft() const { return mfTopXLeft; }
+ const double& getTopXRight() const { return mfTopXRight; }
+ const double& getTopY() const { return mfTopY; }
+ const double& getBottomXLeft() const { return mfBottomXLeft; }
+ const double& getBottomXRight() const { return mfBottomXRight; }
+ const double& getBottomY() const { return mfBottomY; }
+
+ // convenience method to get content as Polygon
+ B2DPolygon getB2DPolygon() const;
+ };
+
+ typedef ::std::vector< B2DTrapezoid > B2DTrapezoidVector;
+
+} // end of namespace basegfx
+
+
+namespace basegfx::utils
+{
+ // convert SourcePolyPolygon to trapezoids. The trapezoids will be appended to
+ // ro_Result. ro_Result will not be cleared. If SourcePolyPolygon contains curves,
+ // it's default AdaptiveSubdivision will be used.
+ // CAUTION: Trapezoids are orientation-dependent in the sense that the upper and lower
+ // lines have to be parallel to the X-Axis, thus this subdivision is NOT simply usable
+ // for primitive decompositions. To use it, the shear and rotate parts of the
+ // involved transformations HAVE to be taken into account.
+ BASEGFX_DLLPUBLIC void trapezoidSubdivide(
+ B2DTrapezoidVector& ro_Result,
+ const B2DPolyPolygon& rSourcePolyPolygon);
+
+ // directly create trapezoids from given edge. Depending on the given geometry,
+ // none up to three trapezoids will be created
+ BASEGFX_DLLPUBLIC void createLineTrapezoidFromEdge(
+ B2DTrapezoidVector& ro_Result,
+ const B2DPoint& rPointA,
+ const B2DPoint& rPointB,
+ double fLineWidth);
+
+ // create trapezoids for all edges of the given polygon. The closed state of
+ // the polygon is taken into account. If curves are contained, the default
+ // AdaptiveSubdivision will be used.
+ BASEGFX_DLLPUBLIC void createLineTrapezoidFromB2DPolygon(
+ B2DTrapezoidVector& ro_Result,
+ const B2DPolygon& rPolygon,
+ double fLineWidth);
+} // end of namespace basegfx::utils
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */