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
|
<!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/qpicture.cpp:53 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>TQPicture 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>TQPicture Class Reference</h1>
<p>The TQPicture class is a paint device that records and
replays TQPainter commands.
<a href="#details">More...</a>
<p><tt>#include <<a href="qpicture-h.html">qpicture.h</a>></tt>
<p>Inherits <a href="qpaintdevice.html">TQPaintDevice</a>.
<p><a href="qpicture-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li class=fn><a href="#TQPicture"><b>TQPicture</b></a> ( int formatVersion = -1 )</li>
<li class=fn><a href="#TQPicture-2"><b>TQPicture</b></a> ( const TQPicture & pic )</li>
<li class=fn><a href="#~TQPicture"><b>~TQPicture</b></a> ()</li>
<li class=fn>bool <a href="#isNull"><b>isNull</b></a> () const</li>
<li class=fn>uint <a href="#size"><b>size</b></a> () const</li>
<li class=fn>const char * <a href="#data"><b>data</b></a> () const</li>
<li class=fn>virtual void <a href="#setData"><b>setData</b></a> ( const char * data, uint size )</li>
<li class=fn>bool <a href="#play"><b>play</b></a> ( TQPainter * painter )</li>
<li class=fn>bool <a href="#load-2"><b>load</b></a> ( TQIODevice * dev, const char * format = 0 )</li>
<li class=fn>bool <a href="#load"><b>load</b></a> ( const TQString & fileName, const char * format = 0 )</li>
<li class=fn>bool <a href="#save-2"><b>save</b></a> ( TQIODevice * dev, const char * format = 0 )</li>
<li class=fn>bool <a href="#save"><b>save</b></a> ( const TQString & fileName, const char * format = 0 )</li>
<li class=fn>TQRect <a href="#boundingRect"><b>boundingRect</b></a> () const</li>
<li class=fn>void <a href="#setBoundingRect"><b>setBoundingRect</b></a> ( const TQRect & r )</li>
<li class=fn>TQPicture & <a href="#operator-eq"><b>operator=</b></a> ( const TQPicture & p )</li>
</ul>
<h2>Protected Members</h2>
<ul>
<li class=fn>virtual int <a href="#metric"><b>metric</b></a> ( int m ) const</li>
<li class=fn>void <a href="#detach"><b>detach</b></a> ()</li>
<li class=fn>TQPicture <a href="#copy"><b>copy</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 TQPicture & r )</li>
<li class=fn>TQDataStream & <a href="#operator-gt-gt"><b>operator>></b></a> ( TQDataStream & s, TQPicture & r )</li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The TQPicture class is a paint device that records and
replays <a href="qpainter.html">TQPainter</a> commands.
<p>
<p> A picture serializes painter commands to an IO device in a
platform-independent format. For example, a picture created under
Windows can be read on a Sun SPARC.
<p> Pictures are called meta-files on some platforms.
<p> TQt pictures use a proprietary binary format. Unlike native picture
(meta-file) formats on many window systems, TQt pictures have no
limitations regarding their contents. Everything that can be
painted can also be stored in a picture, e.g. fonts, pixmaps,
regions, transformed graphics, etc.
<p> TQPicture is an <a href="shclass.html">implicitly shared</a> class.
<p> Example of how to record a picture:
<pre>
TQPicture pic;
<a href="qpainter.html">TQPainter</a> p;
p.<a href="qpainter.html#begin">begin</a>( &pic ); // paint in picture
p.<a href="qpainter.html#drawEllipse">drawEllipse</a>( 10,20, 80,70 ); // draw an ellipse
p.<a href="qpainter.html#end">end</a>(); // painting done
pic.<a href="#save">save</a>( "drawing.pic" ); // save picture
</pre>
<p> Example of how to replay a picture:
<pre>
TQPicture pic;
pic.<a href="#load">load</a>( "drawing.pic" ); // load picture
<a href="qpainter.html">TQPainter</a> p;
p.<a href="qpainter.html#begin">begin</a>( &myWidget ); // paint in myWidget
p.<a href="qpainter.html#drawPicture">drawPicture</a>( pic ); // draw the picture
p.<a href="qpainter.html#end">end</a>(); // painting done
</pre>
<p> Pictures can also be drawn using <a href="#play">play</a>(). Some basic data about a
picture is available, for example, <a href="#size">size</a>(), <a href="#isNull">isNull</a>() and
<a href="#boundingRect">boundingRect</a>().
<p> <p>See also <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="TQPicture"></a>TQPicture::TQPicture ( int formatVersion = -1 )
</h3>
Constructs an empty picture.
<p> The <em>formatVersion</em> parameter may be used to <em>create</em> a TQPicture
that can be read by applications that are compiled with earlier
versions of TQt.
<ul>
<li> <em>formatVersion</em> == 1 is binary compatible with TQt 1.x and later.
<li> <em>formatVersion</em> == 2 is binary compatible with TQt 2.0.x and later.
<li> <em>formatVersion</em> == 3 is binary compatible with TQt 2.1.x and later.
<li> <em>formatVersion</em> == 4 is binary compatible with TQt 3.0.x and later.
<li> <em>formatVersion</em> == 5 is binary compatible with TQt 3.1.
</ul>
<p> Note that the default formatVersion is -1 which signifies the
current release, i.e. for TQt 3.1 a formatVersion of 5 is the same
as the default formatVersion of -1.
<p> Reading pictures generated by earlier versions of TQt is supported
and needs no special coding; the format is automatically detected.
<h3 class=fn><a name="TQPicture-2"></a>TQPicture::TQPicture ( const <a href="qpicture.html">TQPicture</a> & pic )
</h3>
Constructs a <a href="shclass.html">shallow copy</a> of <em>pic</em>.
<h3 class=fn><a name="~TQPicture"></a>TQPicture::~TQPicture ()
</h3>
Destroys the picture.
<h3 class=fn><a href="qrect.html">TQRect</a> <a name="boundingRect"></a>TQPicture::boundingRect () const
</h3>
Returns the picture's bounding rectangle or an invalid rectangle
if the picture contains no data.
<h3 class=fn><a href="qpicture.html">TQPicture</a> <a name="copy"></a>TQPicture::copy () const<tt> [protected]</tt>
</h3>
Returns a <a href="shclass.html">deep copy</a> of the picture.
<h3 class=fn>const char * <a name="data"></a>TQPicture::data () const
</h3>
<p> Returns a pointer to the picture data. The pointer is only valid
until the next non-const function is called on this picture. The
returned pointer is 0 if the picture contains no data.
<p> <p>See also <a href="#size">size</a>() and <a href="#isNull">isNull</a>().
<h3 class=fn>void <a name="detach"></a>TQPicture::detach ()<tt> [protected]</tt>
</h3>
Detaches from shared picture data and makes sure that this picture
is the only one referring to the data.
<p> If multiple pictures share common data, this picture makes a copy
of the data and detaches itself from the sharing mechanism.
Nothing is done if there is just a single reference.
<h3 class=fn>bool <a name="isNull"></a>TQPicture::isNull () const
</h3>
<p> Returns TRUE if the picture contains no data; otherwise returns
FALSE.
<h3 class=fn>bool <a name="load"></a>TQPicture::load ( const <a href="qstring.html">TQString</a> & fileName, const char * format = 0 )
</h3>
Loads a picture from the file specified by <em>fileName</em> and returns
TRUE if successful; otherwise returns FALSE.
<p> By default, the file will be interpreted as being in the native
TQPicture format. Specifying the <em>format</em> string is optional and
is only needed for importing picture data stored in a different
format.
<p> Currently, the only external format supported is the <a href="http://www.w3.org/Graphics/SVG/">W3C SVG</a> format which
retquires the <a href="xml.html">TQt XML module</a>. The
corresponding <em>format</em> string is "svg".
<p> <p>See also <a href="#save">save</a>().
<p>Examples: <a href="picture-example.html#x122">picture/picture.cpp</a> and <a href="xform-example.html#x1244">xform/xform.cpp</a>.
<h3 class=fn>bool <a name="load-2"></a>TQPicture::load ( <a href="qiodevice.html">TQIODevice</a> * dev, const char * format = 0 )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> <em>dev</em> is the device to use for loading.
<h3 class=fn>int <a name="metric"></a>TQPicture::metric ( int m ) const<tt> [virtual protected]</tt>
</h3>
Internal implementation of the virtual TQPaintDevice::metric()
function.
<p> Use the <a href="qpaintdevicemetrics.html">TQPaintDeviceMetrics</a> class instead.
<p> A picture has the following hard-coded values: dpi=72,
numcolors=16777216 and depth=24.
<p> <em>m</em> is the metric to get.
<h3 class=fn><a href="qpicture.html">TQPicture</a> & <a name="operator-eq"></a>TQPicture::operator= ( const <a href="qpicture.html">TQPicture</a> & p )
</h3>
Assigns a <a href="shclass.html">shallow copy</a> of <em>p</em> to this
picture and returns a reference to this picture.
<h3 class=fn>bool <a name="play"></a>TQPicture::play ( <a href="qpainter.html">TQPainter</a> * painter )
</h3>
Replays the picture using <em>painter</em>, and returns TRUE if
successful; otherwise returns FALSE.
<p> This function does exactly the same as <a href="qpainter.html#drawPicture">TQPainter::drawPicture</a>()
with (x, y) = (0, 0).
<h3 class=fn>bool <a name="save"></a>TQPicture::save ( const <a href="qstring.html">TQString</a> & fileName, const char * format = 0 )
</h3>
Saves a picture to the file specified by <em>fileName</em> and returns
TRUE if successful; otherwise returns FALSE.
<p> Specifying the file <em>format</em> string is optional. It's not
recommended unless you intend to export the picture data for
use by a third party reader. By default the data will be saved in
the native TQPicture file format.
<p> Currently, the only external format supported is the <a href="http://www.w3.org/Graphics/SVG/">W3C SVG</a> format which
retquires the <a href="xml.html">TQt XML module</a>. The
corresponding <em>format</em> string is "svg".
<p> <p>See also <a href="#load">load</a>().
<p>Example: <a href="picture-example.html#x123">picture/picture.cpp</a>.
<h3 class=fn>bool <a name="save-2"></a>TQPicture::save ( <a href="qiodevice.html">TQIODevice</a> * dev, const char * format = 0 )
</h3>
This is an overloaded member function, provided for convenience. It behaves essentially like the above function.
<p> <em>dev</em> is the device to use for saving.
<h3 class=fn>void <a name="setBoundingRect"></a>TQPicture::setBoundingRect ( const <a href="qrect.html">TQRect</a> & r )
</h3>
Sets the picture's bounding rectangle to <em>r</em>. The automatically
calculated value is overriden.
<h3 class=fn>void <a name="setData"></a>TQPicture::setData ( const char * data, uint size )<tt> [virtual]</tt>
</h3>
Sets the picture data directly from <em>data</em> and <em>size</em>. This
function copies the input data.
<p> <p>See also <a href="#data">data</a>() and <a href="#size">size</a>().
<h3 class=fn>uint <a name="size"></a>TQPicture::size () const
</h3>
<p> Returns the size of the picture data.
<p> <p>See also <a href="#data">data</a>().
<hr><h2>Related Functions</h2>
<h3 class=fn><a href="qdatastream.html">TQDataStream</a> & <a name="operator-lt-lt"></a>operator<< ( <a href="qdatastream.html">TQDataStream</a> & s, const <a href="qpicture.html">TQPicture</a> & r )
</h3>
<p> Writes picture <em>r</em> to the stream <em>s</em> and returns a reference to
the stream.
<h3 class=fn><a href="qdatastream.html">TQDataStream</a> & <a name="operator-gt-gt"></a>operator>> ( <a href="qdatastream.html">TQDataStream</a> & s, <a href="qpicture.html">TQPicture</a> & r )
</h3>
<p> Reads a picture from the stream <em>s</em> into picture <em>r</em> and returns
a reference to the stream.
<!-- 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>
|
