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<H1><A NAME="SECTION0001100000000000000000">
11 Pie plots</A>
</H1>
<A NAME="module-pie-plot"></A>
<P>
<dl><dt><b><span class="typelabel">class</span> <tt id='l2h-195' xml:id='l2h-195' class="class">pie_plot.T</tt></b>
<dd>
Pie plots.
<IMG
WIDTH="404" HEIGHT="318" ALIGN="BOTTOM" BORDER="0"
SRC="./pietest.png"
ALT="Image pietest">
<P>
<b> Sample pie chart </b>
<P>
Below is the source code that produces the above chart.
../demos/pietest.py
<P>
<div class="verbatim"><pre>
from pychart import *
import sys
data = [("foo", 10),("bar", 20), ("baz", 30), ("ao", 40)]
ar = <a href="module-area.html">area.T</a>(size=(150,150), legend=<a href="module-legend.html">legend.</a>T(),
x_grid_style = None, y_grid_style = None)
plot = <a href="module-pie-plot.html">pie_plot.T</a>(data=data, arc_offsets=[0,10,0,10],
shadow = (2, -2, <a href="module-fill-style.html">fill_style.</a>gray50),
label_offset = 25,
arrow_style = arrow.a3)
ar.add_plot(plot)
ar.draw()
</pre></div>
</dl>
<P>
This class supports the following attributes:
<P>
<dl><dt><b><tt id='l2h-196' xml:id='l2h-196' class="member">arc_offsets</tt></b></dt>
<dd>
<b>Type:</b> list
<b>Default:</b> None.
<P>
You can draw each pie "slice" shifted off-center.
This attribute, if non-None,
must be a number sequence whose length is equal to
the number of pie slices. The Nth value in arc_offsets
specify the amount of offset
(from the center of the circle)
for the Nth slice.
The value of None will draw all the slices
anchored at the center.
<P>
</dl>
<dl><dt><b><tt id='l2h-197' xml:id='l2h-197' class="member">arrow_style</tt></b></dt>
<dd>
<b>Type:</b> arrow.T
( see Section <A href="module-arrow.html#module-arrow">19</A>)
<b>Default:</b> None.
<P>
The style of arrow that connects a label
to the corresponding "pie".
</dl>
<dl><dt><b><tt id='l2h-198' xml:id='l2h-198' class="member">center</tt></b></dt>
<dd>
<b>Type:</b> (x,y) or None
<b>Default:</b> None.
<P>
The location of the center of the pie.
</dl>
<dl><dt><b><tt id='l2h-199' xml:id='l2h-199' class="member">data</tt></b></dt>
<dd>
<b>Type:</b> any
<b>Default:</b> None.
<P>
Specifies the data points. See Section <A href="module-chart-data.html#module-chart-data">5</A>
</dl>
<dl><dt><b><tt id='l2h-200' xml:id='l2h-200' class="member">data_col</tt></b></dt>
<dd>
<b>Type:</b> int
<b>Default:</b> 1.
<P>
The column, within "data", from which the data values are retrieved.
</dl>
<dl><dt><b><tt id='l2h-201' xml:id='l2h-201' class="member">fill_styles</tt></b></dt>
<dd>
<b>Type:</b> list
<b>Default:</b> ['fill_style.black', 'fill_style.gray70', 'fill_style.diag', 'fill_style.gray50', 'fill_style.white', 'fill_style.rdiag', 'fill_style.vert', 'fill_style.gray30', 'fill_style.gray20', 'fill_style.gray10', 'fill_style.diag2', 'fill_style.rdiag2', 'fill_style.diag3', 'fill_style.horiz', 'fill_style.gray90', 'fill_style.rdiag3', 'fill_style.wave', 'fill_style.vwave', 'fill_style.stitch', 'fill_style.lines', 'fill_style.diag_fine', 'fill_style.diag2_fine', 'fill_style.diag3_fine', 'fill_style.rdiag_fine', 'fill_style.rdiag2_fine', 'fill_style.rdiag3_fine', 'fill_style.horiz_fine', 'fill_style.vert_fine'].
<P>
The fill style of each item. The length of the
list should be equal to the length of the data.
<P>
</dl>
<dl><dt><b><tt id='l2h-202' xml:id='l2h-202' class="member">label_col</tt></b></dt>
<dd>
<b>Type:</b> int
<b>Default:</b> 0.
<P>
The column, within "data", from which the labels of items are retrieved.
</dl>
<dl><dt><b><tt id='l2h-203' xml:id='l2h-203' class="member">label_fill_style</tt></b></dt>
<dd>
<b>Type:</b> fill_style.T
( see Section <A href="module-fill-style.html#module-fill-style">16</A>)
<b>Default:</b> fill_style.default.
<P>
The fill style of the frame surrounding each label.
</dl>
<dl><dt><b><tt id='l2h-204' xml:id='l2h-204' class="member">label_format</tt></b></dt>
<dd>
<b>Type:</b> printf format string
<b>Default:</b> "%s".
<P>
Format string of the label
</dl>
<dl><dt><b><tt id='l2h-205' xml:id='l2h-205' class="member">label_line_style</tt></b></dt>
<dd>
<b>Type:</b> line_style.T
( see Section <A href="module-line-style.html#module-line-style">14</A>)
<b>Default:</b> None.
<P>
The style of the frame surrounding each label.
</dl>
<dl><dt><b><tt id='l2h-206' xml:id='l2h-206' class="member">label_offset</tt></b></dt>
<dd>
<b>Type:</b> length in points ( See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> None.
<P>
The distance from the center of each label.
</dl>
<dl><dt><b><tt id='l2h-207' xml:id='l2h-207' class="member">line_style</tt></b></dt>
<dd>
<b>Type:</b> line_style.T
( see Section <A href="module-line-style.html#module-line-style">14</A>)
<b>Default:</b> line_style.black.
<P>
The style of the outer edge of each pie slice.
</dl>
<dl><dt><b><tt id='l2h-208' xml:id='l2h-208' class="member">radius</tt></b></dt>
<dd>
<b>Type:</b> length in points ( See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> None.
<P>
The radius of the pie.
</dl>
<dl><dt><b><tt id='l2h-209' xml:id='l2h-209' class="member">shadow</tt></b></dt>
<dd>
<b>Type:</b> (xoff,yoff,fill)
<b>Default:</b> None.
<P>
The value is either None or a tuple. When non-None,
a drop-shadow is drawn beneath the object. X-off, and y-off specifies the
offset of the shadow relative to the object, and fill specifies the
style of the shadow ( see Section <A href="module-fill-style.html#module-fill-style">16</A>).
</dl>
<dl><dt><b><tt id='l2h-210' xml:id='l2h-210' class="member">start_angle</tt></b></dt>
<dd>
<b>Type:</b> number
<b>Default:</b> 90.
<P>
The angle at which the first item is drawn.
</dl>
<P>
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<span class="release-info">Documentation released on July 2, 2005.</span>
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