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<H1><A NAME="SECTION0002100000000000000000">
21 <tt class="module">canvas</tt> - Controlling output and format</A>
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<A NAME="module-canvas"></A><a id='l2h-344' xml:id='l2h-344'></a>
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<dl><dt><b><span class="typelabel">class</span> <tt id='l2h-343' xml:id='l2h-343' class="class">canvas.T</tt></b>
<dd>
Canvas is an object that corresponds to a single output file. It
provides a set of methods for drawing lines, polygons, texts, and other
things in a manner independent of the file's format. Canvas is usually
hidden from the user, as PyChart creates a <em>default canvas</em> when it
starts up and implicitly writes all charts on the default canvas (unless
the user specifies otherwise; more on that later). There are some
occasions, however, in which you might want to manipulate a canvas
explicitly, e.g., when you want to create multiple plots from a single
file, or you just want to add lines and texts directly.
<P>
Class <code>canvas.T</code> is an abstract base class. PyChart provides several
subclasses that correspond to specific file formats. For example,
<code>pscanvas.T</code> implements methods for PostScript output. Class
<code>pdfcanvas.T</code> implements methods for PDF output.
<a id='l2h-345' xml:id='l2h-345'></a>format
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<LI><A href="drawing-graph-canvas.html">21.2 Drawing plots on canvas</a>
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<span class="release-info">Documentation released on July 2, 2005.</span>
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