1 | /****************************************************************************
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2 | **
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3 | ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
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4 | ** All rights reserved.
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5 | ** Contact: Nokia Corporation ([email protected])
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6 | **
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7 | ** This file is part of the QtCore module of the Qt Toolkit.
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8 | **
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9 | ** $QT_BEGIN_LICENSE:LGPL$
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10 | ** Commercial Usage
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11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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12 | ** accordance with the Qt Commercial License Agreement provided with the
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13 | ** Software or, alternatively, in accordance with the terms contained in
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14 | ** a written agreement between you and Nokia.
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15 | **
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16 | ** GNU Lesser General Public License Usage
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17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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18 | ** General Public License version 2.1 as published by the Free Software
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19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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20 | ** packaging of this file. Please review the following information to
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21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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23 | **
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24 | ** In addition, as a special exception, Nokia gives you certain additional
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25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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27 | **
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28 | ** GNU General Public License Usage
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29 | ** Alternatively, this file may be used under the terms of the GNU
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30 | ** General Public License version 3.0 as published by the Free Software
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31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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32 | ** packaging of this file. Please review the following information to
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33 | ** ensure the GNU General Public License version 3.0 requirements will be
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34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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35 | **
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36 | ** If you have questions regarding the use of this file, please contact
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37 | ** Nokia at [email protected].
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38 | ** $QT_END_LICENSE$
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39 | **
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40 | ****************************************************************************/
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41 |
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42 | #include "qline.h"
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43 | #include "qdebug.h"
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44 | #include "qdatastream.h"
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45 | #include "qmath.h"
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46 | #include <private/qnumeric_p.h>
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47 |
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48 | QT_BEGIN_NAMESPACE
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49 |
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50 | /*!
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51 | \class QLine
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52 | \ingroup painting
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53 |
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54 | \brief The QLine class provides a two-dimensional vector using
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55 | integer precision.
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56 |
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57 | A QLine describes a finite length line (or a line segment) on a
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58 | two-dimensional surface. The start and end points of the line are
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59 | specified using integer point accuracy for coordinates. Use the
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60 | QLineF constructor to retrieve a floating point copy.
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61 |
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62 | \table
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63 | \row
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64 | \o \inlineimage qline-point.png
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65 | \o \inlineimage qline-coordinates.png
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66 | \endtable
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67 |
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68 | The positions of the line's start and end points can be retrieved
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69 | using the p1(), x1(), y1(), p2(), x2(), and y2() functions. The
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70 | dx() and dy() functions return the horizontal and vertical
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71 | components of the line. Use isNull() to determine whether the
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72 | QLine represents a valid line or a null line.
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73 |
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74 | Finally, the line can be translated a given offset using the
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75 | translate() function.
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76 |
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77 | \sa QLineF, QPolygon, QRect
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78 | */
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79 |
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80 | /*!
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81 | \fn QLine::QLine()
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82 |
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83 | Constructs a null line.
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84 | */
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85 |
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86 | /*!
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87 | \fn QLine::QLine(const QPoint &p1, const QPoint &p2)
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88 |
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89 | Constructs a line object that represents the line between \a p1 and
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90 | \a p2.
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91 | */
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92 |
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93 | /*!
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94 | \fn QLine::QLine(int x1, int y1, int x2, int y2)
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