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<p> The <tt>chart</tt> application shows how straight-forward it is to create
applications and their dialogs with Qt. Creating menus and toolbars is
easy and Qt's <a href="signalsandslots.html">signals and slots</a>
mechanism considerably simplifies GUI event handling.
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<li> Use a <a href="qvalidator.html">QValidator</a> subclass to ensure that only valid doubles are
entered as values.
<li> Adding more chart types, e.g. line graph, area graph and hi-lo
graph.
<li> Allowing the user to set top, bottom left and right margins.
<li> Allowing the user to specify a title which they can drag into
position like the labels.
<li> Providing an axis drawing and labelling option.
<li> Providing an option to provide a key (or legend) instead of labels.
<li> Adding a 3D look option to all chart types.
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