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<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">QCanvasView</a> which displays the
<a href="qcanvas.html">QCanvas</a> on which we draw the pie chart or bar graph. We subclass
QCanvasView to obtain some specialised behaviour. Similarly we
subclass the <a href="qcanvastext.html">QCanvasText</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">« Introduction</a> |
<a href="tutorial2.html">Contents</a> |
<a href="tutorial2-03.html">Data Elements »</a>
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