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<title>The 'Big Picture'</title>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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<font color="#004faf">Main Classes</font></a>
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<font color="#004faf">Annotated</font></a>
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<font color="#004faf">Functions</font></a>
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</td>
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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>
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<p>
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<p> <center><img src="chart-forms.png" alt="The chart application's dialogs"></center>
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<p> The <tt>chart</tt> program allows users to create, save, load and visualise
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simple data sets. Each data element that the user enters can be given
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a color and pattern for the pie segment or bar, some label text and
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the text's position and color. The <tt>Element</tt> class is used to
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represent data elements.
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<p> The program consists of a simple <tt>main.cpp</tt> that loads the chart
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form. The chart form has a menubar and toolbar which provide access to
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the program's functionality. The program provides two dialogs, one to
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set options, and the other to create and edit a data set. Both dialogs
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are launched from chart form menu options or toolbar buttons.
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<p> The chart form's main widget is a <a href="tqcanvasview.html">TQCanvasView</a> which displays the
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<a href="tqcanvas.html">TQCanvas</a> on which we draw the pie chart or bar graph. We subclass
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TQCanvasView to obtain some specialised behaviour. Similarly we
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subclass the <a href="tqcanvastext.html">TQCanvasText</a> class (used to place text items on a canvas)
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since we require slightly more than the standard class provides.
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<p> The project file, <tt>chart.pro</tt>, is used to create the Makefile that is
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used to build the application.
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<p> <p align="right">
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<a href="tutorial2-01.html">« Introduction</a> |
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<a href="tutorial2.html">Contents</a> |
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<a href="tutorial2-03.html">Data Elements »</a>
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</p>
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<p>
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>TQt 3.3.8</div>
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</table></div></address></body>
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</html>
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