doc/html/tutorial2-02.html


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

<!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/doc/tutorial2.doc:73 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>The 'Big Picture'</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>The 'Big Picture'</h1>


<p> 
<p> <center><img src="chart-forms.png" alt="The chart application's dialogs"></center> 
<p> The <tt>chart</tt> program allows users to create, save, load and visualise
simple data sets. Each data element that the user enters can be given
a color and pattern for the pie segment or bar, some label text and
the text's position and color. The <tt>Element</tt> class is used to
represent data elements.
<p> The program consists of a simple <tt>main.cpp</tt> that loads the chart
form. The chart form has a menubar and toolbar which provide access to
the program's functionality. The program provides two dialogs, one to
set options, and the other to create and edit a data set. Both dialogs
are launched from chart form menu options or toolbar buttons.
<p> The chart form's main widget is a <a href="qcanvasview.html">TQCanvasView</a> which displays the
<a href="qcanvas.html">TQCanvas</a> on which we draw the pie chart or bar graph. We subclass
TQCanvasView to obtain some specialised behaviour. Similarly we
subclass the <a href="qcanvastext.html">TQCanvasText</a> class (used to place text items on a canvas)
since we require slightly more than the standard class provides.
<p> The project file, <tt>chart.pro</tt>, is used to create the Makefile that is
used to build the application.
<p> <p align="right">
<a href="tutorial2-01.html">&laquo; Introduction</a> |
<a href="tutorial2.html">Contents</a> |
<a href="tutorial2-03.html">Data Elements &raquo;</a>
</p>
<p> 
<!-- eof -->
<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>