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
|
<!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/qpointarray.cpp:47 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>TQPointArray 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 Classes</font></a>
| <a href="mainclasses.html">
<font color="#004faf">Main Classes</font></a>
| <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
| <a href="groups.html">
<font color="#004faf">Grouped 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>TQPointArray Class Reference</h1>
<p>The TQPointArray class provides an array of points.
<a href="#details">More...</a>
<p><tt>#include <<a href="qpointarray-h.html">ntqpointarray.h</a>></tt>
<p>Inherits <a href="tqmemarray.html">TQMemArray</a><TQPoint>.
<p><a href="qpointarray-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#TQPointArray"><b>TQPointArray</b></a> ()</li>
<li class=fn><a href="#~TQPointArray"><b>~TQPointArray</b></a> ()</li>
<li class=fn><a href="#TQPointArray-2"><b>TQPointArray</b></a> ( int size )</li>
<li class=fn><a href="#TQPointArray-3"><b>TQPointArray</b></a> ( const TQPointArray & a )</li>
<li class=fn><a href="#TQPointArray-4"><b>TQPointArray</b></a> ( const TQRect & r, bool closed = FALSE )</li>
<li class=fn>TQPointArray & <a href="#operator-eq"><b>operator=</b></a> ( const TQPointArray & a )</li>
<li class=fn>TQPointArray <a href="#copy"><b>copy</b></a> () const</li>
<li class=fn>void <a href="#translate"><b>translate</b></a> ( int dx, int dy )</li>
<li class=fn>TQRect <a href="#boundingRect"><b>boundingRect</b></a> () const</li>
<li class=fn>void <a href="#point"><b>point</b></a> ( uint index, int * x, int * y ) const</li>
<li class=fn>TQPoint <a href="#point-2"><b>point</b></a> ( uint index ) const</li>
<li class=fn>void <a href="#setPoint"><b>setPoint</b></a> ( uint index, int x, int y )</li>
<li class=fn>void <a href="#setPoint-2"><b>setPoint</b></a> ( uint i, const TQPoint & p )</li>
<li class=fn>bool <a href="#putPoints"><b>putPoints</b></a> ( int index, int nPoints, int firstx, int firsty, ... )</li>
<li class=fn>bool <a href="#putPoints-3"><b>putPoints</b></a> ( int index, int nPoints, const TQPointArray & from, int fromIndex = 0 )</li>
<li class=fn>void <a href="#makeArc"><b>makeArc</b></a> ( int x, int y, int w, int h, int a1, int a2 )</li>
<li class=fn>void <a href="#makeEllipse"><b>makeEllipse</b></a> ( int x, int y, int w, int h )</li>
<li class=fn>void <a href="#makeArc-2"><b>makeArc</b></a> ( int x, int y, int w, int h, int a1, int a2, const TQWMatrix & xf )</li>
<li class=fn>TQPointArray <a href="#cubicBezier"><b>cubicBezier</b></a> () const</li>
</ul>
<h2>Related Functions</h2>
<ul>
<li class=fn>TQDataStream & <a href="#operator-lt-lt"><b>operator<<</b></a> ( TQDataStream & s, const TQPointArray & a )</li>
<li class=fn>TQDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( TQDataStream & s, TQPointArray & a )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The TQPointArray class provides an array of points.
<p>
<p> A TQPointArray is an array of <a href="ntqpoint.html">TQPoint</a> objects. In addition to the
functions provided by <a href="tqmemarray.html">TQMemArray</a>, TQPointArray provides some
point-specific functions.
<p> For convenient reading and writing of the point data use
setPoints(), <a href="#putPoints">putPoints</a>(), <a href="#point">point</a>(), and <a href="#setPoint">setPoint</a>().
<p> For geometry operations use <a href="#boundingRect">boundingRect</a>() and <a href="#translate">translate</a>(). There
is also the <a href="ntqwmatrix.html#map">TQWMatrix::map</a>() function for more general
transformations of TQPointArrays. You can also create arcs and
ellipses with <a href="#makeArc">makeArc</a>() and <a href="#makeEllipse">makeEllipse</a>().
<p> Among others, TQPointArray is used by <a href="ntqpainter.html#drawLineSegments">TQPainter::drawLineSegments</a>(),
<a href="ntqpainter.html#drawPolyline">TQPainter::drawPolyline</a>(), <a href="ntqpainter.html#drawPolygon">TQPainter::drawPolygon</a>() and
<a href="ntqpainter.html#drawCubicBezier">TQPainter::drawCubicBezier</a>().
<p> Note that because this class is a TQMemArray, copying an array and
modifying the copy modifies the original as well, i.e. a <a href="shclass.html#shallow-copy">shallow copy</a>. If you need a <a href="shclass.html#deep-copy">deep copy</a> use <a href="#copy">copy</a>() or <a href="tqmemarray.html#detach">detach</a>(), for example:
<p> <pre>
void drawGiraffe( const TQPointArray & r, TQPainter * p )
{
TQPointArray tmp = r;
tmp.<a href="tqmemarray.html#detach">detach</a>();
// some code that modifies tmp
p->drawPoints( tmp );
}
</pre>
<p> If you forget the tmp.detach(), the const array will be modified.
<p> <p>See also <a href="ntqpainter.html">TQPainter</a>, <a href="ntqwmatrix.html">TQWMatrix</a>, <a href="tqmemarray.html">TQMemArray</a>, <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a>, and <a href="shared.html">Implicitly and Explicitly Shared Classes</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="TQPointArray"></a>TQPointArray::TQPointArray ()
</h3>
<p> Constructs a null point array.
<p> <p>See also <a href="tqmemarray.html#isNull">isNull</a>().
<h3 class=fn><a name="TQPointArray-2"></a>TQPointArray::TQPointArray ( int size )
</h3>
<p> Constructs a point array with room for <em>size</em> points. Makes a
null array if <em>size</em> == 0.
<p> <p>See also <a href="tqmemarray.html#resize">resize</a>() and <a href="tqmemarray.html#isNull">isNull</a>().
<h3 class=fn><a name="TQPointArray-3"></a>TQPointArray::TQPointArray ( const <a href="ntqpointarray.html">TQPointArray</a> & a )
</h3>
<p> Constructs a <a href="shclass.html#shallow-copy">shallow copy</a> of the point array <em>a</em>.
<p> <p>See also <a href="#copy">copy</a>() and <a href="tqmemarray.html#detach">detach</a>().
<h3 class=fn><a name="TQPointArray-4"></a>TQPointArray::TQPointArray ( const <a href="ntqrect.html">TQRect</a> & r, bool closed = FALSE )
</h3>
Constructs a point array from the rectangle <em>r</em>.
<p> If <em>closed</em> is FALSE, then the point array just contains the
following four points in the listed order: r.topLeft(),
r.topRight(), r.bottomRight() and r.bottomLeft().
<p> If <em>closed</em> is TRUE, then a fifth point is set to r.topLeft().
<h3 class=fn><a name="~TQPointArray"></a>TQPointArray::~TQPointArray ()
</h3>
<p> Destroys the point array.
<h3 class=fn><a href="ntqrect.html">TQRect</a> <a name="boundingRect"></a>TQPointArray::boundingRect () const
</h3>
Returns the bounding rectangle of the points in the array, or
<a href="ntqrect.html">TQRect</a>(0,0,0,0) if the array is empty.
<h3 class=fn><a href="ntqpointarray.html">TQPointArray</a> <a name="copy"></a>TQPointArray::copy () const
</h3>
<p> Creates a <a href="shclass.html#deep-copy">deep copy</a> of the array.
<p> <p>See also <a href="tqmemarray.html#detach">detach</a>().
<h3 class=fn><a href="ntqpointarray.html">TQPointArray</a> <a name="cubicBezier"></a>TQPointArray::cubicBezier () const
</h3>
Returns the Bezier points for the four control points in this
array.
<h3 class=fn>void <a name="makeArc"></a>TQPointArray::makeArc ( int x, int y, int w, int h, int a1, int a2 )
</h3>
Sets the points of the array to those describing an arc of an
ellipse with size, width <em>w</em> by height <em>h</em>, and position (<em>x</em>,
<em>y</em>), starting from angle <em>a1</em> and spanning by angle <em>a2</em>. The
resulting array has sufficient resolution for pixel accuracy (see
the overloaded function which takes an additional <a href="ntqwmatrix.html">TQWMatrix</a>
parameter).
<p> Angles are specified in 16ths of a degree, i.e. a full circle
equals 5760 (16*360). Positive values mean counter-clockwise,
whereas negative values mean the clockwise direction. Zero degrees
is at the 3 o'clock position.
<p> See the <a href="tqcanvasellipse.html#anglediagram">angle diagram</a>.
<h3 class=fn>void <a name="makeArc-2"></a>TQPointArray::makeArc ( int x, int y, int w, int h, int a1, int a2, const <a href="ntqwmatrix.html">TQWMatrix</a> & xf )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Sets the points of the array to those describing an arc of an
ellipse with width <em>w</em> and height <em>h</em> and position (<em>x</em>, <em>y</em>),
starting from angle <em>a1</em>, and spanning angle by <em>a2</em>, and
transformed by the matrix <em>xf</em>. The resulting array has
sufficient resolution for pixel accuracy.
<p> Angles are specified in 16ths of a degree, i.e. a full circle
equals 5760 (16*360). Positive values mean counter-clockwise,
whereas negative values mean the clockwise direction. Zero degrees
is at the 3 o'clock position.
<p> See the <a href="tqcanvasellipse.html#anglediagram">angle diagram</a>.
<h3 class=fn>void <a name="makeEllipse"></a>TQPointArray::makeEllipse ( int x, int y, int w, int h )
</h3>
Sets the points of the array to those describing an ellipse with
size, width <em>w</em> by height <em>h</em>, and position (<em>x</em>, <em>y</em>).
<p> The returned array has sufficient resolution for use as pixels.
<h3 class=fn><a href="ntqpointarray.html">TQPointArray</a> & <a name="operator-eq"></a>TQPointArray::operator= ( const <a href="ntqpointarray.html">TQPointArray</a> & a )
</h3>
<p> Assigns a <a href="shclass.html#shallow-copy">shallow copy</a> of <em>a</em> to this point array and returns a
reference to this point array.
<p> Equivalent to <a href="tqmemarray.html#assign">assign</a>(a).
<p> <p>See also <a href="#copy">copy</a>() and <a href="tqmemarray.html#detach">detach</a>().
<h3 class=fn>void <a name="point"></a>TQPointArray::point ( uint index, int * x, int * y ) const
</h3>
Reads the coordinates of the point at position <em>index</em> within the
array and writes them into <em>*x</em> and <em>*y</em>.
<h3 class=fn><a href="ntqpoint.html">TQPoint</a> <a name="point-2"></a>TQPointArray::point ( uint index ) const
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Returns the point at position <em>index</em> within the array.
<h3 class=fn>bool <a name="putPoints"></a>TQPointArray::putPoints ( int index, int nPoints, int firstx, int firsty, ... )
</h3>
Copies <em>nPoints</em> points from the variable argument list into this
point array from position <em>index</em>, and resizes the point array if
<tt>index+nPoints</tt> exceeds the size of the array.
<p> Returns TRUE if successful, or FALSE if the array could not be
resized (typically due to lack of memory).
<p> The example code creates an array with three points (4,5), (6,7)
and (8,9), by expanding the array from 1 to 3 points:
<p> <pre>
TQPointArray a( 1 );
a[0] = TQPoint( 4, 5 );
a.<a href="#putPoints">putPoints</a>( 1, 2, 6,7, 8,9 ); // index == 1, points == 2
</pre>
<p> This has the same result, but here putPoints overwrites rather
than extends:
<pre>
TQPointArray a( 3 );
a.<a href="#putPoints">putPoints</a>( 0, 3, 4,5, 0,0, 8,9 );
a.<a href="#putPoints">putPoints</a>( 1, 1, 6,7 );
</pre>
<p> The points are given as a sequence of integers, starting with <em>firstx</em> then <em>firsty</em>, and so on.
<p> <p>See also <a href="tqmemarray.html#resize">resize</a>().
<h3 class=fn>bool <a name="putPoints-3"></a>TQPointArray::putPoints ( int index, int nPoints, const <a href="ntqpointarray.html">TQPointArray</a> & from, int fromIndex = 0 )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> This version of the function copies <em>nPoints</em> from <em>from</em> into
this array, starting at <em>index</em> in this array and <em>fromIndex</em> in
<em>from</em>. <em>fromIndex</em> is 0 by default.
<p> <pre>
TQPointArray a;
a.<a href="#putPoints">putPoints</a>( 0, 3, 1,2, 0,0, 5,6 );
// a is now the three-point array ( 1,2, 0,0, 5,6 );
TQPointArray b;
b.<a href="#putPoints">putPoints</a>( 0, 3, 4,4, 5,5, 6,6 );
// b is now ( 4,4, 5,5, 6,6 );
a.<a href="#putPoints">putPoints</a>( 2, 3, b );
// a is now ( 1,2, 0,0, 4,4, 5,5, 6,6 );
</pre>
<h3 class=fn>void <a name="setPoint"></a>TQPointArray::setPoint ( uint index, int x, int y )
</h3>
Sets the point at position <em>index</em> in the array to <em>(x, y)</em>.
<p>Example: <a href="themes-example.html#x231">themes/wood.cpp</a>.
<h3 class=fn>void <a name="setPoint-2"></a>TQPointArray::setPoint ( uint i, const <a href="ntqpoint.html">TQPoint</a> & p )
</h3>
<p> This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> Sets the point at array index <em>i</em> to <em>p</em>.
<h3 class=fn>void <a name="translate"></a>TQPointArray::translate ( int dx, int dy )
</h3>
Translates all points in the array by <em>(dx, dy)</em>.
<hr><h2>Related Functions</h2>
<h3 class=fn><a href="tqdatastream.html">TQDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="tqdatastream.html">TQDataStream</a> & s, const <a href="ntqpointarray.html">TQPointArray</a> & a )
</h3>
<p> Writes the point array, <em>a</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="tqdatastream.html">TQDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="tqdatastream.html">TQDataStream</a> & s, <a href="ntqpointarray.html">TQPointArray</a> & a )
</h3>
<p> Reads a point array, <em>a</em> from 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>.
<!-- eof -->
<hr><p>
This file is part of the <a href="index.html">TQt toolkit</a>.
Copyright © 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 © 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>
|
