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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95 |
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96 | Constructs a line object that represents the line between (\a x1, \a y1) and
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97 | (\a x2, \a y2).
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98 | */
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99 |
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100 | /*!
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101 | \fn bool QLine::isNull() const
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102 |
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103 | Returns true if the line is not set up with valid start and end point;
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104 | otherwise returns false.
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105 | */
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106 |
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107 | /*!
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108 | \fn QPoint QLine::p1() const
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109 |
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110 | Returns the line's start point.
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111 |
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112 | \sa x1(), y1(), p2()
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113 | */
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114 |
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115 | /*!
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116 | \fn QPoint QLine::p2() const
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117 |
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118 | Returns the line's end point.
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119 |
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120 | \sa x2(), y2(), p1()
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121 | */
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122 |
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123 | /*!
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124 | \fn int QLine::x1() const
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125 |
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126 | Returns the x-coordinate of the line's start point.
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127 |
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128 | \sa p1()
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129 | */
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130 |
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131 | /*!
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132 | \fn int QLine::y1() const
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133 |
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134 | Returns the y-coordinate of the line's start point.
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135 |
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136 | \sa p1()
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137 | */
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138 |
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139 | /*!
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140 | \fn int QLine::x2() const
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141 |
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142 | Returns the x-coordinate of the line's end point.
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143 |
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144 | \sa p2()
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145 | */
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146 |
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147 | /*!
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148 | \fn int QLine::y2() const
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149 |
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150 | Returns the y-coordinate of the line's end point.
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151 |
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152 | \sa p2()
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153 | */
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154 |
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155 | /*!
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156 | \fn int QLine::dx() const
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157 |
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158 | Returns the horizontal component of the line's vector.
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159 |
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160 | \sa dy()
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161 | */
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162 |
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163 | /*!
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164 | \fn int QLine::dy() const
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165 |
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166 | Returns the vertical component of the line's vector.
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167 |
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168 | \sa dx()
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169 | */
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170 |
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171 | /*!
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172 | \fn bool QLine::operator!=(const QLine &line) const
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173 |
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174 | Returns true if the given \a line is not the same as \e this line.
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175 |
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176 | A line is different from another line if any of their start or
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177 | end points differ, or the internal order of the points is different.
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178 | */
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179 |
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180 | /*!
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181 | \fn bool QLine::operator==(const QLine &line) const
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182 |
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183 | Returns true if the given \a line is the same as \e this line.
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184 |
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185 | A line is identical to another line if the start and end points
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186 | are identical, and the internal order of the points is the same.
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187 | */
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188 |
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189 | /*!
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190 | \fn void QLine::translate(const QPoint &offset)
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191 |
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192 | Translates this line by the given \a offset.
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193 | */
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194 |
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195 | /*!
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196 | \fn void QLine::translate(int dx, int dy)
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197 | \overload
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198 |
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199 | Translates this line the distance specified by \a dx and \a dy.
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200 | */
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201 |
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202 | /*!
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203 | \fn QLine QLine::translated(const QPoint &offset) const
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204 |
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205 | \since 4.4
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206 |
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207 | Returns this line translated by the given \a offset.
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208 | */
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209 |
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210 | /*!
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211 | \fn QLine QLine::translated(int dx, int dy) const
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212 | \overload
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213 | \since 4.4
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214 |
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