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  • Committer: Bazaar Package Importer
  • Author(s): Stuart Prescott
  • Date: 2011-05-20 00:13:52 UTC
  • mto: (9.1.1 experimental)
  • mto: This revision was merged to the branch mainline in revision 8.
  • Revision ID: james.westby@ubuntu.com-20110520001352-odcuqpdezuusbbw1
Tags: upstream-0.11.1
Import upstream version 0.11.1

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examples/drawing2/insert.txt
 
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Inserting transformed canvases into canvases
 
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Similar to the drawing of paths onto canvases, it is also possible to insert
 
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one canvas into another. You may specify additional transformations which are
 
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applied to the canvas which is inserted. ...
 
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The example code shows how a canvas `cc` containing a square can be inserted
 
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several times into another canvas `c`. The applied transformation first rotates
 
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the square around the origin and then performs a scaling. Note that not only
 
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the size of the square gets scaled, but everything that is drawn on the canvas,
 
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also the linewidth of the square.
 
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In geometrical operations, it is often necessary to perform calculations. This
 
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is conveniently done by importing the mathematics capability of Python. In the
 
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example, we calculate the scaling factor from the rotation angle such that the
 
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corners of the rotated smaller square reside on the sides of the larger square.