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| 31 | </td>
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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QPoint Class Reference</h1>
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| 33 |
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| 34 | <p>The QPoint class defines a point in the plane.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qpoint-h.html">qpoint.h</a>></tt>
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| 37 | <p><a href="qpoint-members.html">List of all member functions.</a>
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| 38 | <h2>Public Members</h2>
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| 39 | <ul>
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| 40 | <li class=fn><a href="#QPoint"><b>QPoint</b></a> ()</li>
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| 41 | <li class=fn><a href="#QPoint-2"><b>QPoint</b></a> ( int xpos, int ypos )</li>
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| 42 | <li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li>
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| 43 | <li class=fn>int <a href="#x"><b>x</b></a> () const</li>
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| 44 | <li class=fn>int <a href="#y"><b>y</b></a> () const</li>
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| 45 | <li class=fn>void <a href="#setX"><b>setX</b></a> ( int x )</li>
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| 46 | <li class=fn>void <a href="#setY"><b>setY</b></a> ( int y )</li>
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| 47 | <li class=fn>int <a href="#manhattanLength"><b>manhattanLength</b></a> () const</li>
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| 48 | <li class=fn>QCOORD & <a href="#rx"><b>rx</b></a> ()</li>
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| 49 | <li class=fn>QCOORD & <a href="#ry"><b>ry</b></a> ()</li>
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| 50 | <li class=fn>QPoint & <a href="#operator+-eq"><b>operator+=</b></a> ( const QPoint & p )</li>
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| 51 | <li class=fn>QPoint & <a href="#operator--eq"><b>operator-=</b></a> ( const QPoint & p )</li>
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| 52 | <li class=fn>QPoint & <a href="#operator*-eq"><b>operator*=</b></a> ( int c )</li>
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| 53 | <li class=fn>QPoint & <a href="#operator*-eq-2"><b>operator*=</b></a> ( double c )</li>
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| 54 | <li class=fn>QPoint & <a href="#operator/-eq"><b>operator/=</b></a> ( int c )</li>
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| 55 | <li class=fn>QPoint & <a href="#operator/-eq-2"><b>operator/=</b></a> ( double c )</li>
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| 56 | </ul>
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| 57 | <h2>Related Functions</h2>
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| 58 | <ul>
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| 59 | <li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const QPoint & p1, const QPoint & p2 )</li>
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| 60 | <li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const QPoint & p1, const QPoint & p2 )</li>
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| 61 | <li class=fn>const QPoint <a href="#operator+"><b>operator+</b></a> ( const QPoint & p1, const QPoint & p2 )</li>
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| 62 | <li class=fn>const QPoint <a href="#operator-"><b>operator-</b></a> ( const QPoint & p1, const QPoint & p2 )</li>
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| 63 | <li class=fn>const QPoint <a href="#operator*"><b>operator*</b></a> ( const QPoint & p, int c )</li>
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| 64 | <li class=fn>const QPoint <a href="#operator*-2"><b>operator*</b></a> ( int c, const QPoint & p )</li>
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| 65 | <li class=fn>const QPoint <a href="#operator*-3"><b>operator*</b></a> ( const QPoint & p, double c )</li>
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| 66 | <li class=fn>const QPoint <a href="#operator*-4"><b>operator*</b></a> ( double c, const QPoint & p )</li>
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| 67 | <li class=fn>const QPoint <a href="#operator--2"><b>operator-</b></a> ( const QPoint & p )</li>
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| 68 | <li class=fn>const QPoint <a href="#operator/"><b>operator/</b></a> ( const QPoint & p, int c )</li>
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| 69 | <li class=fn>const QPoint <a href="#operator/-2"><b>operator/</b></a> ( const QPoint & p, double c )</li>
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| 70 | <li class=fn>QDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( QDataStream & s, const QPoint & p )</li>
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| 71 | <li class=fn>QDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( QDataStream & s, QPoint & p )</li>
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| 72 | </ul>
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| 73 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 74 |
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| 75 |
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| 76 | The QPoint class defines a point in the plane.
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| 77 | <p>
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| 78 |
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| 79 |
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| 80 | <p> A point is specified by an x coordinate and a y coordinate.
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| 81 | <p> The coordinate type is <tt>QCOORD</tt> (a 32-bit integer). The minimum
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| 82 | value of <tt>QCOORD</tt> is <tt>QCOORD_MIN</tt> (-2147483648) and the maximum
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| 83 | value is <tt>QCOORD_MAX</tt> (2147483647).
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| 84 | <p> The coordinates are accessed by the functions <a href="#x">x</a>() and <a href="#y">y</a>(); they
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| 85 | can be set by <a href="#setX">setX</a>() and <a href="#setY">setY</a>() or by the reference functions <a href="#rx">rx</a>()
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| 86 | and <a href="#ry">ry</a>().
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| 87 | <p> Given a point <em>p</em>, the following statements are all equivalent:
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| 88 | <pre>
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| 89 | p.setX( p.x() + 1 );
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| 90 | p += <a href="#QPoint">QPoint</a>( 1, 0 );
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| 91 | p.rx()++;
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| 92 | </pre>
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| 93 |
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| 94 | <p> A QPoint can also be used as a vector. Addition and subtraction
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| 95 | of QPoints are defined as for vectors (each component is added
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| 96 | separately). You can divide or multiply a QPoint by an <tt>int</tt> or a
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| 97 | <tt>double</tt>. The function <a href="#manhattanLength">manhattanLength</a>() gives an inexpensive
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| 98 | approximation of the length of the QPoint interpreted as a vector.
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| 99 | <p> Example:
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| 100 | <pre>
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| 101 | //QPoint oldPos is defined somewhere else
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| 102 | MyWidget::mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> *e )
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| 103 | {
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| 104 | QPoint vector = e-><a href="qmouseevent.html#pos">pos</a>() - oldPos;
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| 105 | if ( vector.<a href="#manhattanLength">manhattanLength</a>() > 3 )
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| 106 | ... //mouse has moved more than 3 pixels since oldPos
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| 107 | }
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| 108 | </pre>
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| 109 |
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| 110 | <p> QPoints can be compared for equality or inequality, and they can
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| 111 | be written to and read from a QStream.
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| 112 | <p> <p>See also <a href="qpointarray.html">QPointArray</a>, <a href="qsize.html">QSize</a>, <a href="qrect.html">QRect</a>, <a href="graphics.html">Graphics Classes</a>, and <a href="images.html">Image Processing Classes</a>.
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| 113 |
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| 114 | <hr><h2>Member Function Documentation</h2>
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| 115 | <h3 class=fn><a name="QPoint"></a>QPoint::QPoint ()
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| 116 | </h3>
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| 117 |
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| 118 | <p> Constructs a point with coordinates (0, 0) (<a href="#isNull">isNull</a>() returns TRUE).
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| 119 |
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| 120 | <h3 class=fn><a name="QPoint-2"></a>QPoint::QPoint ( int xpos, int ypos )
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| 121 | </h3>
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| 122 |
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| 123 | <p> Constructs a point with x value <em>xpos</em> and y value <em>ypos</em>.
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| 124 |
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| 125 | <h3 class=fn>bool <a name="isNull"></a>QPoint::isNull () const
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| 126 | </h3>
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| 127 |
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| 128 | <p> Returns TRUE if both the x value and the y value are 0; otherwise
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| 129 | returns FALSE.
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| 130 |
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| 131 | <h3 class=fn>int <a name="manhattanLength"></a>QPoint::manhattanLength () const
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| 132 | </h3>
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| 133 | Returns the sum of the absolute values of <a href="#x">x</a>() and <a href="#y">y</a>(),
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| 134 | traditionally known as the "Manhattan length" of the vector from
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| 135 | the origin to the point. The tradition arises because such
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| 136 | distances apply to travelers who can only travel on a rectangular
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| 137 | grid, like the streets of Manhattan.
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| 138 | <p> This is a useful, and quick to calculate, approximation to the
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| 139 | true length: sqrt(pow(x(),2)+pow(y(),2)).
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| 140 |
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| 141 | <h3 class=fn><a href="qpoint.html">QPoint</a> & <a name="operator*-eq"></a>QPoint::operator*= ( int c )
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| 142 | </h3>
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| 143 |
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| 144 | <p> Multiplies this point's x and y by <em>c</em>, and returns a reference
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| 145 | to this point.
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| 146 | <p> Example:
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| 147 | <pre>
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| 148 | QPoint p( -1, 4 );
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| 149 | p *= 2; // p becomes (-2,8)
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| 150 | </pre>
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| 151 |
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| 152 |
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| 153 | <h3 class=fn><a href="qpoint.html">QPoint</a> & <a name="operator*-eq-2"></a>QPoint::operator*= ( double c )
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| 154 | </h3>
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| 155 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 156 | <p> Multiplies this point's x and y by <em>c</em>, and returns a reference
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| 157 | to this point.
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| 158 | <p> Example:
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| 159 | <pre>
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| 160 | QPoint p( -1, 4 );
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| 161 | p *= 2.5; // p becomes (-3,10)
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| 162 | </pre>
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| 163 |
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| 164 | <p> Note that the result is truncated because points are held as
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| 165 | integers.
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| 166 |
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| 167 | <h3 class=fn><a href="qpoint.html">QPoint</a> & <a name="operator+-eq"></a>QPoint::operator+= ( const <a href="qpoint.html">QPoint</a> & p )
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| 168 | </h3>
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| 169 |
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| 170 | <p> Adds point <em>p</em> to this point and returns a reference to this
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| 171 | point.
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| 172 | <p> Example:
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| 173 | <pre>
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| 174 | QPoint p( 3, 7 );
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| 175 | QPoint q( -1, 4 );
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| 176 | p += q; // p becomes (2,11)
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| 177 | </pre>
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| 178 |
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| 179 |
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| 180 | <h3 class=fn><a href="qpoint.html">QPoint</a> & <a name="operator--eq"></a>QPoint::operator-= ( const <a href="qpoint.html">QPoint</a> & p )
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| 181 | </h3>
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| 182 |
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| 183 | <p> Subtracts point <em>p</em> from this point and returns a reference to
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| 184 | this point.
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| 185 | <p> Example:
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| 186 | <pre>
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| 187 | QPoint p( 3, 7 );
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| 188 | QPoint q( -1, 4 );
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| 189 | p -= q; // p becomes (4,3)
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| 190 | </pre>
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| 191 |
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| 192 |
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| 193 | <h3 class=fn><a href="qpoint.html">QPoint</a> & <a name="operator/-eq"></a>QPoint::operator/= ( int c )
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| 194 | </h3>
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| 195 |
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| 196 | <p> Divides both x and y by <em>c</em>, and returns a reference to this
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| 197 | point.
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| 198 | <p> Example:
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| 199 | <pre>
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| 200 | QPoint p( -2, 8 );
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| 201 | p /= 2; // p becomes (-1,4)
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| 202 | </pre>
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| 203 |
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| 204 |
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| 205 | <h3 class=fn><a href="qpoint.html">QPoint</a> & <a name="operator/-eq-2"></a>QPoint::operator/= ( double c )
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| 206 | </h3>
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| 207 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 208 | <p> Divides both x and y by <em>c</em>, and returns a reference to this
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| 209 | point.
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| 210 | <p> Example:
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| 211 | <pre>
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| 212 | QPoint p( -3, 10 );
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| 213 | p /= 2.5; // p becomes (-1,4)
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| 214 | </pre>
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| 215 |
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| 216 | <p> Note that the result is truncated because points are held as
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| 217 | integers.
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| 218 |
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| 219 | <h3 class=fn>QCOORD & <a name="rx"></a>QPoint::rx ()
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| 220 | </h3>
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| 221 |
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| 222 | <p> Returns a reference to the x coordinate of the point.
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| 223 | <p> Using a reference makes it possible to directly manipulate x.
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| 224 | <p> Example:
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| 225 | <pre>
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| 226 | QPoint p( 1, 2 );
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| 227 | p.<a href="#rx">rx</a>()--; // p becomes (0, 2)
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| 228 | </pre>
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| 229 |
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| 230 | <p> <p>See also <a href="#ry">ry</a>().
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| 231 |
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| 232 | <h3 class=fn>QCOORD & <a name="ry"></a>QPoint::ry ()
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| 233 | </h3>
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| 234 |
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| 235 | <p> Returns a reference to the y coordinate of the point.
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| 236 | <p> Using a reference makes it possible to directly manipulate y.
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| 237 | <p> Example:
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| 238 | <pre>
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| 239 | QPoint p( 1, 2 );
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| 240 | p.<a href="#ry">ry</a>()++; // p becomes (1, 3)
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| 241 | </pre>
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| 242 |
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| 243 | <p> <p>See also <a href="#rx">rx</a>().
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| 244 |
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| 245 | <h3 class=fn>void <a name="setX"></a>QPoint::setX ( int x )
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| 246 | </h3>
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| 247 |
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| 248 | <p> Sets the x coordinate of the point to <em>x</em>.
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| 249 | <p> <p>See also <a href="#x">x</a>() and <a href="#setY">setY</a>().
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| 250 |
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| 251 | <p>Example: <a href="tutorial1-14.html#x2422">t14/cannon.cpp</a>.
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| 252 | <h3 class=fn>void <a name="setY"></a>QPoint::setY ( int y )
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| 253 | </h3>
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| 254 |
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| 255 | <p> Sets the y coordinate of the point to <em>y</em>.
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| 256 | <p> <p>See also <a href="#y">y</a>() and <a href="#setX">setX</a>().
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| 257 |
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| 258 | <p>Example: <a href="tutorial1-14.html#x2423">t14/cannon.cpp</a>.
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| 259 | <h3 class=fn>int <a name="x"></a>QPoint::x () const
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| 260 | </h3>
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| 261 |
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| 262 | <p> Returns the x coordinate of the point.
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| 263 | <p> <p>See also <a href="#setX">setX</a>() and <a href="#y">y</a>().
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| 264 |
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| 265 | <p>Examples: <a href="canvas-example.html#x2944">canvas/canvas.cpp</a>, <a href="tutorial2-06.html#x2581">chart/canvasview.cpp</a>, <a href="dirview-example.html#x1696">dirview/dirview.cpp</a>, <a href="fileiconview-example.html#x864">fileiconview/qfileiconview.cpp</a>, <a href="helpsystem-example.html#x2679">helpsystem/tooltip.cpp</a>, <a href="life-example.html#x1893">life/life.cpp</a>, and <a href="tutorial1-14.html#x2424">t14/cannon.cpp</a>.
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| 266 | <h3 class=fn>int <a name="y"></a>QPoint::y () const
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| 267 | </h3>
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| 268 |
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| 269 | <p> Returns the y coordinate of the point.
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| 270 | <p> <p>See also <a href="#setY">setY</a>() and <a href="#x">x</a>().
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| 271 |
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| 272 | <p>Examples: <a href="canvas-example.html#x2945">canvas/canvas.cpp</a>, <a href="tutorial2-06.html#x2582">chart/canvasview.cpp</a>, <a href="fileiconview-example.html#x865">fileiconview/qfileiconview.cpp</a>, <a href="helpsystem-example.html#x2680">helpsystem/tooltip.cpp</a>, <a href="life-example.html#x1894">life/life.cpp</a>, <a href="tutorial1-14.html#x2425">t14/cannon.cpp</a>, and <a href="themes-example.html#x230">themes/wood.cpp</a>.
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| 273 | <hr><h2>Related Functions</h2>
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| 274 | <h3 class=fn>bool <a name="operator!-eq"></a>operator!= ( const <a href="qpoint.html">QPoint</a> & p1, const <a href="qpoint.html">QPoint</a> & p2 )
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| 275 | </h3>
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| 276 |
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| 277 | <p>
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| 278 | <p> Returns TRUE if <em>p1</em> and <em>p2</em> are not equal; otherwise returns FALSE.
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| 279 |
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| 280 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator*"></a>operator* ( const <a href="qpoint.html">QPoint</a> & p, int c )
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| 281 | </h3>
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| 282 |
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| 283 | <p>
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| 284 | <p> Returns the QPoint formed by multiplying both components of <em>p</em>
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| 285 | by <em>c</em>.
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| 286 |
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| 287 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator*-2"></a>operator* ( int c, const <a href="qpoint.html">QPoint</a> & p )
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| 288 | </h3>
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| 289 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 290 | <p>
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| 291 | <p> Returns the QPoint formed by multiplying both components of <em>p</em>
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| 292 | by <em>c</em>.
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| 293 |
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| 294 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator*-3"></a>operator* ( const <a href="qpoint.html">QPoint</a> & p, double c )
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| 295 | </h3>
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| 296 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 297 | <p>
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| 298 | <p> Returns the QPoint formed by multiplying both components of <em>p</em>
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| 299 | by <em>c</em>.
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| 300 | <p> Note that the result is truncated because points are held as
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| 301 | integers.
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| 302 |
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| 303 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator*-4"></a>operator* ( double c, const <a href="qpoint.html">QPoint</a> & p )
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| 304 | </h3>
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| 305 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 306 | <p>
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| 307 | <p> Returns the QPoint formed by multiplying both components of <em>p</em>
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| 308 | by <em>c</em>.
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| 309 | <p> Note that the result is truncated because points are held as
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| 310 | integers.
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| 311 |
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| 312 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator+"></a>operator+ ( const <a href="qpoint.html">QPoint</a> & p1, const <a href="qpoint.html">QPoint</a> & p2 )
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| 313 | </h3>
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| 314 |
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| 315 | <p>
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| 316 | <p> Returns the sum of <em>p1</em> and <em>p2</em>; each component is added separately.
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| 317 |
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| 318 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator-"></a>operator- ( const <a href="qpoint.html">QPoint</a> & p1, const <a href="qpoint.html">QPoint</a> & p2 )
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| 319 | </h3>
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| 320 |
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| 321 | <p>
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| 322 | <p> Returns <em>p2</em> subtracted from <em>p1</em>; each component is subtracted
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| 323 | separately.
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| 324 |
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| 325 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator--2"></a>operator- ( const <a href="qpoint.html">QPoint</a> & p )
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| 326 | </h3>
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| 327 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
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| 328 | <p>
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| 329 | <p> Returns the QPoint formed by changing the sign of both components
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| 330 | of <em>p</em>, equivalent to <tt>QPoint(0,0) - p</tt>.
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| 331 |
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| 332 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator/"></a>operator/ ( const <a href="qpoint.html">QPoint</a> & p, int c )
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| 333 | </h3>
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| 334 |
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| 335 | <p>
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| 336 | <p> Returns the QPoint formed by dividing both components of <em>p</em> by
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| 337 | <em>c</em>.
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| 338 |
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| 339 | <h3 class=fn>const <a href="qpoint.html">QPoint</a> <a name="operator/-2"></a>operator/ ( const <a href="qpoint.html">QPoint</a> & p, double c )
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| 340 | </h3>
|
|---|
| 341 | This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
|
|---|
| 342 | <p>
|
|---|
| 343 | <p> Returns the QPoint formed by dividing both components of <em>p</em>
|
|---|
| 344 | by <em>c</em>.
|
|---|
| 345 | <p> Note that the result is truncated because points are held as
|
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| 346 | integers.
|
|---|
| 347 |
|
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| 348 | <h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="qdatastream.html">QDataStream</a> & s, const <a href="qpoint.html">QPoint</a> & p )
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| 349 | </h3>
|
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| 350 |
|
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| 351 | <p> Writes point <em>p</em> to the stream <em>s</em> and returns a reference to
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| 352 | the stream.
|
|---|
| 353 | <p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
|
|---|
| 354 |
|
|---|
| 355 | <h3 class=fn>bool <a name="operator-eq-eq"></a>operator== ( const <a href="qpoint.html">QPoint</a> & p1, const <a href="qpoint.html">QPoint</a> & p2 )
|
|---|
| 356 | </h3>
|
|---|
| 357 |
|
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| 358 | <p>
|
|---|
| 359 | <p> Returns TRUE if <em>p1</em> and <em>p2</em> are equal; otherwise returns FALSE.
|
|---|
| 360 |
|
|---|
| 361 | <h3 class=fn><a href="qdatastream.html">QDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="qdatastream.html">QDataStream</a> & s, <a href="qpoint.html">QPoint</a> & p )
|
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| 362 | </h3>
|
|---|
| 363 |
|
|---|
| 364 | <p> Reads a QPoint from the stream <em>s</em> into point <em>p</em> and returns a
|
|---|
| 365 | reference to the stream.
|
|---|
| 366 | <p> <p>See also <a href="datastreamformat.html">Format of the QDataStream operators</a>.
|
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| 367 |
|
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| 368 | <!-- eof -->
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| 369 | <hr><p>
|
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| 370 | This file is part of the <a href="index.html">Qt toolkit</a>.
|
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| 371 | Copyright © 1995-2007
|
|---|
| 372 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
|
|---|
| 373 | <table width=100% cellspacing=0 border=0><tr>
|
|---|
| 374 | <td>Copyright © 2007
|
|---|
| 375 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
|
|---|
| 376 | <td align=right><div align=right>Qt 3.3.8</div>
|
|---|
| 377 | </table></div></address></body>
|
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| 378 | </html>
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