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<H1><A NAME="SECTION0001900000000000000000">
19 Arrows</A>
</H1>
<A NAME="module-arrow"></A>
<P>
<dl><dt><b><span class="typelabel">class</span> <tt id='l2h-332' xml:id='l2h-332' class="class">arrow.T</tt></b>
<dd>
Arrow is an optional component of a chart that draws line segments with
an arrowhead. To draw an arrow, one creates an arrow.T object, and calls
its "draw" method usually after area.draw() is called (otherwise, area.draw()
may overwrite the arrow). For example, the below code draws an arrow
from (10,10) to (20,30).
<P>
<div class="verbatim"><pre>
ar = <a href="module-area.html">area.T</a>(...)
a = <a href="module-arrow.html">arrow.T</a>(head_style = 1)
ar.draw()
a.draw([(10,10), (20,30)])
</pre></div>
</dl>
<P>
This class supports the following attributes:
<P>
<dl><dt><b><tt id='l2h-333' xml:id='l2h-333' class="member">head_color</tt></b></dt>
<dd>
<b>Type:</b> color.T
( see Section <A href="module-color.html#module-color">15</A>)
<b>Default:</b> color.black.
<P>
The color of the arrow head.
</dl>
<dl><dt><b><tt id='l2h-334' xml:id='l2h-334' class="member">head_len</tt></b></dt>
<dd>
<b>Type:</b> length in points ( See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> 8.
<P>
The length of the arrow head.
</dl>
<dl><dt><b><tt id='l2h-335' xml:id='l2h-335' class="member">head_style</tt></b></dt>
<dd>
<b>Type:</b> int
<b>Default:</b> 1.
<P>
The value of 0 draws a triangular arrow head. The value of 1 draws a swallow-tail arrow head. The value of 2 draws a circular head. The value of 3 draws a diamond-shaped head.
</dl>
<dl><dt><b><tt id='l2h-336' xml:id='l2h-336' 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>
Line style.
</dl>
<dl><dt><b><tt id='l2h-337' xml:id='l2h-337' class="member">thickness</tt></b></dt>
<dd>
<b>Type:</b> length in points ( See Section <A href="unit.html#unit">4</A>)
<b>Default:</b> 4.
<P>
The width of the arrow head.
</dl>
<P>
An arrow object exports a single public method, <code>draw</code>.
<P>
<dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline">
<td><nobr><b><tt id='l2h-338' xml:id='l2h-338' class="method">draw</tt></b>(</nobr></td>
<td><var>points</var>)</td></tr></table></dt>
<dd>
Parameter <var>points</var> specifies the
list of points the arrow traverses through.
It should contain at least two points, i.e.,
the tail and tip. Parameter
<var>can</var> is an optional parameter that specifies the output.
See Section <A href="module-canvas.html#module-canvas">21</A>
<P>
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<span class="release-info">Documentation released on July 2, 2005.</span>
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