summaryrefslogtreecommitdiffstats
path: root/doc/html/ntqregion.html
blob: dcba288bafd71df6f455ee187ab0ba10cff133fd (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/src/kernel/qregion.cpp:44 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>TQRegion Class</title>
<style type="text/css"><!--
fn { margin-left: 1cm; text-indent: -1cm; }
a:link { color: #004faf; text-decoration: none }
a:visited { color: #672967; text-decoration: none }
body { background: #ffffff; color: black; }
--></style>
</head>
<body>

<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
 <a href="index.html">
<font color="#004faf">Home</font></a>
 | <a href="classes.html">
<font color="#004faf">All&nbsp;Classes</font></a>
 | <a href="mainclasses.html">
<font color="#004faf">Main&nbsp;Classes</font></a>
 | <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
 | <a href="groups.html">
<font color="#004faf">Grouped&nbsp;Classes</font></a>
 | <a href="functions.html">
<font color="#004faf">Functions</font></a>
</td>
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>TQRegion Class Reference</h1>

<p>The TQRegion class specifies a clip region for a painter.
<a href="#details">More...</a>
<p><tt>#include &lt;<a href="qregion-h.html">ntqregion.h</a>&gt;</tt>
<p><a href="qregion-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn>enum <a href="#RegionType-enum"><b>RegionType</b></a> { Rectangle, Ellipse }</li>
<li class=fn><a href="#TQRegion"><b>TQRegion</b></a> ()</li>
<li class=fn><a href="#TQRegion-2"><b>TQRegion</b></a> ( int&nbsp;x, int&nbsp;y, int&nbsp;w, int&nbsp;h, RegionType&nbsp;t = Rectangle )</li>
<li class=fn><a href="#TQRegion-3"><b>TQRegion</b></a> ( const&nbsp;TQRect&nbsp;&amp;&nbsp;r, RegionType&nbsp;t = Rectangle )</li>
<li class=fn><a href="#TQRegion-4"><b>TQRegion</b></a> ( const&nbsp;TQPointArray&nbsp;&amp;&nbsp;a, bool&nbsp;winding = FALSE )</li>
<li class=fn><a href="#TQRegion-5"><b>TQRegion</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r )</li>
<li class=fn><a href="#TQRegion-6"><b>TQRegion</b></a> ( const&nbsp;TQBitmap&nbsp;&amp;&nbsp;bm )</li>
<li class=fn><a href="#~TQRegion"><b>~TQRegion</b></a> ()</li>
<li class=fn>TQRegion &amp; <a href="#operator-eq"><b>operator=</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r )</li>
<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li>
<li class=fn>bool <a href="#isEmpty"><b>isEmpty</b></a> () const</li>
<li class=fn>bool <a href="#contains"><b>contains</b></a> ( const&nbsp;TQPoint&nbsp;&amp;&nbsp;p ) const</li>
<li class=fn>bool <a href="#contains-2"><b>contains</b></a> ( const&nbsp;TQRect&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>void <a href="#translate"><b>translate</b></a> ( int&nbsp;dx, int&nbsp;dy )</li>
<li class=fn>TQRegion <a href="#unite"><b>unite</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>TQRegion <a href="#intersect"><b>intersect</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>TQRegion <a href="#subtract"><b>subtract</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>TQRegion <a href="#eor"><b>eor</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>TQRect <a href="#boundingRect"><b>boundingRect</b></a> () const</li>
<li class=fn>TQMemArray&lt;TQRect&gt; <a href="#rects"><b>rects</b></a> () const</li>
<li class=fn>const TQRegion <a href="#operator|"><b>operator|</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>const TQRegion <a href="#operator+"><b>operator+</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>const TQRegion <a href="#operator-and"><b>operator&amp;</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>const TQRegion <a href="#operator-"><b>operator-</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>const TQRegion <a href="#operator^"><b>operator^</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>TQRegion &amp; <a href="#operator|-eq"><b>operator|=</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r )</li>
<li class=fn>TQRegion &amp; <a href="#operator+-eq"><b>operator+=</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r )</li>
<li class=fn>TQRegion &amp; <a href="#operator-and-eq"><b>operator&amp;=</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r )</li>
<li class=fn>TQRegion &amp; <a href="#operator--eq"><b>operator-=</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r )</li>
<li class=fn>TQRegion &amp; <a href="#operator^-eq"><b>operator^=</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r )</li>
<li class=fn>bool <a href="#operator-eq-eq"><b>operator==</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>bool <a href="#operator!-eq"><b>operator!=</b></a> ( const&nbsp;TQRegion&nbsp;&amp;&nbsp;r ) const</li>
<li class=fn>HRGN <a href="#handle"><b>handle</b></a> () const</li>
</ul>
<h2>Related Functions</h2>
<ul>
<li class=fn>TQDataStream &amp; <a href="#operator-lt-lt"><b>operator&lt;&lt;</b></a> ( TQDataStream&nbsp;&amp;&nbsp;s, const&nbsp;TQRegion&nbsp;&amp;&nbsp;r )</li>
<li class=fn>TQDataStream &amp; <a href="#operator-gt-gt"><b>operator&gt;&gt;</b></a> ( TQDataStream&nbsp;&amp;&nbsp;s, TQRegion&nbsp;&amp;&nbsp;r )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>


The TQRegion class specifies a clip region for a painter.
<p> 

<p> TQRegion is used with <a href="ntqpainter.html#setClipRegion">TQPainter::setClipRegion</a>() to limit the paint
area to what needs to be painted. There is also a
<a href="tqwidget.html#repaint">TQWidget::repaint</a>() that takes a TQRegion parameter. TQRegion is the
best tool for reducing flicker.
<p> A region can be created from a rectangle, an ellipse, a polygon or
a bitmap. Complex regions may be created by combining simple
regions using <a href="#unite">unite</a>(), <a href="#intersect">intersect</a>(), <a href="#subtract">subtract</a>() or <a href="#eor">eor</a>() (exclusive
or). You can move a region using <a href="#translate">translate</a>().
<p> You can test whether a region <a href="#isNull">isNull</a>(), <a href="#isEmpty">isEmpty</a>() or if it
<a href="#contains">contains</a>() a <a href="ntqpoint.html">TQPoint</a> or <a href="ntqrect.html">TQRect</a>. The bounding rectangle is given by
<a href="#boundingRect">boundingRect</a>().
<p> The function <a href="#rects">rects</a>() gives a decomposition of the region into
rectangles.
<p> Example of using complex regions:
<pre>
        void MyWidget::paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * )
        {
            <a href="ntqpainter.html">TQPainter</a> p;                         // our painter
            TQRegion r1( TQRect(100,100,200,80),  // r1 = elliptic region
                        TQRegion::<a href="#RegionType-enum">Ellipse</a> );
            TQRegion r2( TQRect(100,120,90,30) ); // r2 = rectangular region
            TQRegion r3 = r1.<a href="#intersect">intersect</a>( r2 );    // r3 = intersection
            p.<a href="ntqpainter.html#begin">begin</a>( this );                    // start painting widget
            p.<a href="ntqpainter.html#setClipRegion">setClipRegion</a>( r3 );              // set clip region
            ...                                 // paint clipped graphics
            p.<a href="ntqpainter.html#end">end</a>();                            // painting done
        }
    </pre>
 
<p> TQRegion is an <a href="shclass.html">implicitly shared</a> class.
<p> <b>Warning:</b> Due to window system limitations, the whole coordinate
space for a region is limited to the points between -32767 and
32767 on Mac OS X and Windows 95/98/ME.
<p> <p>See also <a href="ntqpainter.html#setClipRegion">TQPainter::setClipRegion</a>(), <a href="ntqpainter.html#setClipRect">TQPainter::setClipRect</a>(), <a href="graphics.html">Graphics Classes</a>, and <a href="images.html">Image Processing Classes</a>.

<hr><h2>Member Type Documentation</h2>
<h3 class=fn><a name="RegionType-enum"></a>TQRegion::RegionType</h3>

<p> Specifies the shape of the region to be created.
<ul>
<li><tt>TQRegion::Rectangle</tt> - the region covers the entire rectangle.
<li><tt>TQRegion::Ellipse</tt> - the region is an ellipse inside the rectangle.
</ul>
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="TQRegion"></a>TQRegion::TQRegion ()
</h3>
Constructs a null region.
<p> <p>See also <a href="#isNull">isNull</a>().

<h3 class=fn><a name="TQRegion-2"></a>TQRegion::TQRegion ( int&nbsp;x, int&nbsp;y, int&nbsp;w, int&nbsp;h, <a href="ntqregion.html#RegionType-enum">RegionType</a>&nbsp;t = Rectangle )
</h3>
Constructs a rectangular or elliptic region.
<p> If <em>t</em> is <a href="#RegionType-enum">Rectangle</a>, the region is the filled rectangle (<em>x</em>,
<em>y</em>, <em>w</em>, <em>h</em>). If <em>t</em> is <a href="#RegionType-enum">Ellipse</a>, the region is the filled
ellipse with center at (<em>x</em> + <em>w</em> / 2, <em>y</em> + <em>h</em> / 2) and size
(<em>w</em> ,<em>h</em> ).

<h3 class=fn><a name="TQRegion-3"></a>TQRegion::TQRegion ( const&nbsp;<a href="ntqrect.html">TQRect</a>&nbsp;&amp;&nbsp;r, <a href="ntqregion.html#RegionType-enum">RegionType</a>&nbsp;t = Rectangle )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Create a region based on the rectange <em>r</em> with region type <em>t</em>.
<p> If the rectangle is invalid a null region will be created.
<p> <p>See also <a href="#RegionType-enum">TQRegion::RegionType</a>.

<h3 class=fn><a name="TQRegion-4"></a>TQRegion::TQRegion ( const&nbsp;<a href="ntqpointarray.html">TQPointArray</a>&nbsp;&amp;&nbsp;a, bool&nbsp;winding = FALSE )
</h3>
Constructs a polygon region from the point array <em>a</em>.
<p> If <em>winding</em> is TRUE, the polygon region is filled using the
winding algorithm, otherwise the default even-odd fill algorithm
is used.
<p> This constructor may create complex regions that will slow down
painting when used.

<h3 class=fn><a name="TQRegion-5"></a>TQRegion::TQRegion ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>
Constructs a new region which is equal to region <em>r</em>.

<h3 class=fn><a name="TQRegion-6"></a>TQRegion::TQRegion ( const&nbsp;<a href="ntqbitmap.html">TQBitmap</a>&nbsp;&amp;&nbsp;bm )
</h3>
Constructs a region from the bitmap <em>bm</em>.
<p> The resulting region consists of the pixels in bitmap <em>bm</em> that
are <tt>color1</tt>, as if each pixel was a 1 by 1 rectangle.
<p> This constructor may create complex regions that will slow down
painting when used. Note that drawing masked pixmaps can be done
much faster using <a href="ntqpixmap.html#setMask">TQPixmap::setMask</a>().

<h3 class=fn><a name="~TQRegion"></a>TQRegion::~TQRegion ()
</h3>
Destroys the region.

<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="boundingRect"></a>TQRegion::boundingRect () const
</h3>
Returns the bounding rectangle of this region. An empty region
gives a rectangle that is <a href="ntqrect.html#isNull">TQRect::isNull</a>().

<h3 class=fn>bool <a name="contains"></a>TQRegion::contains ( const&nbsp;<a href="ntqpoint.html">TQPoint</a>&nbsp;&amp;&nbsp;p ) const
</h3>
Returns TRUE if the region contains the point <em>p</em>; otherwise
returns FALSE.

<h3 class=fn>bool <a name="contains-2"></a>TQRegion::contains ( const&nbsp;<a href="ntqrect.html">TQRect</a>&nbsp;&amp;&nbsp;r ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns TRUE if the region overlaps the rectangle <em>r</em>; otherwise
returns FALSE.

<h3 class=fn><a href="ntqregion.html">TQRegion</a> <a name="eor"></a>TQRegion::eor ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Returns a region which is the exclusive or (XOR) of this region
and <em>r</em>.
<p> <center><img src="rxor.png" alt="Region XORed"></center> 
<p> The figure shows the exclusive or of two elliptical regions.

<h3 class=fn>HRGN <a name="handle"></a>TQRegion::handle () const
</h3>

<p> Returns the region's handle.

<h3 class=fn><a href="ntqregion.html">TQRegion</a> <a name="intersect"></a>TQRegion::intersect ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Returns a region which is the intersection of this region and <em>r</em>.
<p> <center><img src="rintersect.png" alt="Region Intersection"></center> 
<p> The figure shows the intersection of two elliptical regions.

<h3 class=fn>bool <a name="isEmpty"></a>TQRegion::isEmpty () const
</h3>
Returns TRUE if the region is empty; otherwise returns FALSE. An
empty region is a region that contains no points.
<p> Example:
<pre>
        TQRegion r1( 10, 10, 20, 20 );
        TQRegion r2( 40, 40, 20, 20 );
        TQRegion r3;
        r1.<a href="#isNull">isNull</a>();             // FALSE
        r1.<a href="#isEmpty">isEmpty</a>();            // FALSE
        r3.<a href="#isNull">isNull</a>();             // TRUE
        r3.<a href="#isEmpty">isEmpty</a>();            // TRUE
        r3 = r1.<a href="#intersect">intersect</a>( r2 ); // r3 = intersection of r1 and r2
        r3.<a href="#isNull">isNull</a>();             // FALSE
        r3.<a href="#isEmpty">isEmpty</a>();            // TRUE
        r3 = r1.<a href="#unite">unite</a>( r2 );     // r3 = union of r1 and r2
        r3.<a href="#isNull">isNull</a>();             // FALSE
        r3.<a href="#isEmpty">isEmpty</a>();            // FALSE
    </pre>
 
<p> <p>See also <a href="#isNull">isNull</a>().

<h3 class=fn>bool <a name="isNull"></a>TQRegion::isNull () const
</h3>
Returns TRUE if the region is a null region; otherwise returns
FALSE.
<p> A null region is a region that has not been initialized. A null
region is always empty.
<p> <p>See also <a href="#isEmpty">isEmpty</a>().

<h3 class=fn>bool <a name="operator!-eq"></a>TQRegion::operator!= ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>

<p> Returns TRUE if the region is different from <em>r</em>; otherwise
returns FALSE.

<h3 class=fn>const&nbsp;<a href="ntqregion.html">TQRegion</a> <a name="operator-and"></a>TQRegion::operator&amp; ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Applies the <a href="#intersect">intersect</a>() function to this region and <em>r</em>. <tt>r1&amp;r2</tt>
is equivalent to <tt>r1.intersect(r2)</tt>
<p> <p>See also <a href="#intersect">intersect</a>().

<h3 class=fn><a href="ntqregion.html">TQRegion</a>&nbsp;&amp; <a name="operator-and-eq"></a>TQRegion::operator&amp;= ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>
Applies the <a href="#intersect">intersect</a>() function to this region and <em>r</em> and
assigns the result to this region. <tt>r1&amp;=r2</tt> is equivalent to <tt>r1=r1.intersect(r2)</tt>
<p> <p>See also <a href="#intersect">intersect</a>().

<h3 class=fn>const&nbsp;<a href="ntqregion.html">TQRegion</a> <a name="operator+"></a>TQRegion::operator+ ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Applies the <a href="#unite">unite</a>() function to this region and <em>r</em>. <tt>r1+r2</tt> is
equivalent to <tt>r1.unite(r2)</tt>
<p> <p>See also <a href="#unite">unite</a>() and <a href="#operator|">operator|</a>().

<h3 class=fn><a href="ntqregion.html">TQRegion</a>&nbsp;&amp; <a name="operator+-eq"></a>TQRegion::operator+= ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>
Applies the <a href="#unite">unite</a>() function to this region and <em>r</em> and assigns
the result to this region. <tt>r1+=r2</tt> is equivalent to <tt>r1=r1.unite(r2)</tt>
<p> <p>See also <a href="#intersect">intersect</a>().

<h3 class=fn>const&nbsp;<a href="ntqregion.html">TQRegion</a> <a name="operator-"></a>TQRegion::operator- ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Applies the <a href="#subtract">subtract</a>() function to this region and <em>r</em>. <tt>r1-r2</tt>
is equivalent to <tt>r1.subtract(r2)</tt>
<p> <p>See also <a href="#subtract">subtract</a>().

<h3 class=fn><a href="ntqregion.html">TQRegion</a>&nbsp;&amp; <a name="operator--eq"></a>TQRegion::operator-= ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>
Applies the <a href="#subtract">subtract</a>() function to this region and <em>r</em> and
assigns the result to this region. <tt>r1-=r2</tt> is equivalent to <tt>r1=r1.subtract(r2)</tt>
<p> <p>See also <a href="#subtract">subtract</a>().

<h3 class=fn><a href="ntqregion.html">TQRegion</a>&nbsp;&amp; <a name="operator-eq"></a>TQRegion::operator= ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>
Assigns <em>r</em> to this region and returns a reference to the region.

<h3 class=fn>bool <a name="operator-eq-eq"></a>TQRegion::operator== ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Returns TRUE if the region is equal to <em>r</em>; otherwise returns
FALSE.

<h3 class=fn>const&nbsp;<a href="ntqregion.html">TQRegion</a> <a name="operator^"></a>TQRegion::operator^ ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Applies the <a href="#eor">eor</a>() function to this region and <em>r</em>. <tt>r1^r2</tt> is
equivalent to <tt>r1.eor(r2)</tt>
<p> <p>See also <a href="#eor">eor</a>().

<h3 class=fn><a href="ntqregion.html">TQRegion</a>&nbsp;&amp; <a name="operator^-eq"></a>TQRegion::operator^= ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>
Applies the <a href="#eor">eor</a>() function to this region and <em>r</em> and
assigns the result to this region. <tt>r1^=r2</tt> is equivalent to <tt>r1=r1.eor(r2)</tt>
<p> <p>See also <a href="#eor">eor</a>().

<h3 class=fn>const&nbsp;<a href="ntqregion.html">TQRegion</a> <a name="operator|"></a>TQRegion::operator| ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Applies the <a href="#unite">unite</a>() function to this region and <em>r</em>. <tt>r1|r2</tt> is
equivalent to <tt>r1.unite(r2)</tt>
<p> <p>See also <a href="#unite">unite</a>() and <a href="#operator+">operator+</a>().

<h3 class=fn><a href="ntqregion.html">TQRegion</a>&nbsp;&amp; <a name="operator|-eq"></a>TQRegion::operator|= ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>
Applies the <a href="#unite">unite</a>() function to this region and <em>r</em> and assigns
the result to this region. <tt>r1|=r2</tt> is equivalent to <tt>r1=r1.unite(r2)</tt>
<p> <p>See also <a href="#unite">unite</a>().

<h3 class=fn><a href="ntqmemarray.html">TQMemArray</a>&lt;TQRect&gt; <a name="rects"></a>TQRegion::rects () const
</h3>
Returns an array of non-overlapping rectangles that make up the
region.
<p> The union of all the rectangles is equal to the original region.

<h3 class=fn><a href="ntqregion.html">TQRegion</a> <a name="subtract"></a>TQRegion::subtract ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Returns a region which is <em>r</em> subtracted from this region.
<p> <center><img src="rsubtract.png" alt="Region Subtraction"></center> 
<p> The figure shows the result when the ellipse on the right is
subtracted from the ellipse on the left. (<tt>left-right</tt> )

<h3 class=fn>void <a name="translate"></a>TQRegion::translate ( int&nbsp;dx, int&nbsp;dy )
</h3>
Translates (moves) the region <em>dx</em> along the X axis and <em>dy</em>
along the Y axis.

<h3 class=fn><a href="ntqregion.html">TQRegion</a> <a name="unite"></a>TQRegion::unite ( const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r ) const
</h3>
Returns a region which is the union of this region and <em>r</em>.
<p> <center><img src="runion.png" alt="Region Union"></center> 
<p> The figure shows the union of two elliptical regions.

<hr><h2>Related Functions</h2>
<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a>&nbsp;&amp; <a name="operator-lt-lt"></a>operator&lt;&lt; ( <a href="ntqdatastream.html">TQDataStream</a>&nbsp;&amp;&nbsp;s, const&nbsp;<a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>

<p> Writes the region <em>r</em> to the stream <em>s</em> and returns a reference
to the stream.
<p> <p>See also <a href="datastreamformat.html">Format of the TQDataStream operators</a>.

<h3 class=fn><a href="ntqdatastream.html">TQDataStream</a>&nbsp;&amp; <a name="operator-gt-gt"></a>operator&gt;&gt; ( <a href="ntqdatastream.html">TQDataStream</a>&nbsp;&amp;&nbsp;s, <a href="ntqregion.html">TQRegion</a>&nbsp;&amp;&nbsp;r )
</h3>

<p> Reads a region from the stream <em>s</em> into <em>r</em> and returns a
reference to the stream.
<p> <p>See also <a href="datastreamformat.html">Format of the TQDataStream operators</a>.

<!-- eof -->
<hr><p>
This file is part of the <a href="index.html">TQt toolkit</a>.
Copyright &copy; 1995-2007
<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright &copy; 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>TQt 3.3.8</div>
</table></div></address></body>
</html>