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<messages>
<message id="error-missing-data">
<div>The data file "{1}" could not be found. Check your deployment.</div>
</message>
<message id="charts-introduction">
<h2><span>Introduction</span></h2>
<p class="p">
This example demonstrates some of the capabilities of
the <a href="/wt/doc/reference/html/namespaceWt_1_1Chart.html"
target="_new">Wt charting widgets</a>. These widgets are implemented
using
the <a href="/wt/doc/reference/html/classWt_1_1WPaintedWidget.html"
target="_new">Wt painting API</a>, which provides cross-browser
native painting, using VML, SVG, or the Html 5 canvas tag.
</p>
<p class="p">
The two main chart widgets are <a
href="/wt/doc/reference/html/classWt_1_1Chart_1_1WCartesianChart.html"
target="_new"><tt>WCartesianChart</tt></a>, which provides category
charts and scatter plots, and <a
href="/wt/doc/reference/html/classWt_1_1Chart_1_1WPieChart.html"
target="_new"><tt>WPieChart</tt></a> which provides pie
charts. These widgets are based on the MVC mechanism, and retrieve
their data from a <a
href="/wt/doc/reference/html/classWt_1_1WAbstractItemModel.html"
target="_new"><tt>WAbstractItemModel</tt></a>.
</p>
<p class="p">
Many aspects of the charts may be customized. By default, style
information for rendering data series are taken from a
<a href="/wt/doc/reference/html/classWt_1_1Chart_1_1WChartPalette.html" target="_new"><tt>WChartPalette</tt></a>. It
is straight forward to specialize this class to provide different
styles from the standard styles provided by <a href="/wt/doc/reference/html/classWt_1_1Chart_1_1WStandardPalette.html" target="_new"><tt>WStandardPalette</tt></a>.
</p>
<p class="p">
Btw, would you expect this example to work when Ajax/JavaScript are
not available or disabled?
</p>
</message>
<message id="category chart">
<h2><span>Category Chart</span></h2>
<p class="p">
A category chart uses categories on the X axis, and displays one or
more data series on the Y axes. The values corresponding to each
category are plotted consecutively (this is the main difference with
a scatterp lot). Each data series corresponds to a column from the
model.
</p>
<p class="p">
A cartesian chart provides automatic configuration of the axes, and
support for a second Y axis. In addition, you may use a simple
built-in legend, or extend the class to provide a specialized
legend. In the example below, we use a manual Y axis configuration,
with a break as would be commonly used when your data has a few
outliers.
</p>
<p class="p">
The table view allows editing of the model, which is automatically
reflected in the chart.
</p>
</message>
<message id="scatter plot">
<h2><span>Scatter Plot (time series)</span></h2>
<p class="p">
A scatter plot is very much like a category chart, but uses
numerical data on the X axis. By default, these numerical data are
mapped linearly on the X axis, but may also be log transformed (as
can be configured for the Y axes). In addition, there is special
support for displaying date series, by means of smart heuristics for
chosing the labels on the X axis.
</p>
<p class="p">
Below is an extract from historical financial market data.
</p>
</message>
<message id="scatter plot 2">
<h2><span>Scatter Plot (sine function)</span></h2>
<p class="p">
Below we plot a single sine curves. We use 'curve' data series,
which creates a smooth spline curve that interpolates the data
points. As is typical when showing mathematical functions, we let
the axes cross each other at the origin (0, 0).
</p>
</message>
<message id="pie chart">
<h2><span>Pie chart</span></h2>
<p class="p">
The pie chart is provided by the <tt>WPieChart</tt> widget. A pie
chart can only display data from one data series. The class supports
both plain 2D pies, as well as a 3D effect (as used below). As shown
below for the first segment, these may be separated from the pie to
show emphasis.
</p>
</message>
</messages>
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