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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 .
*/
#ifndef INCLUDED_BASEGFX_POLYGON_B2DTRAPEZOID_HXX
#define INCLUDED_BASEGFX_POLYGON_B2DTRAPEZOID_HXX
#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 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
{
namespace 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 utils
} // end of namespace basegfx
#endif // INCLUDED_BASEGFX_POLYGON_B2DTRAPEZOID_HXX
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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