+<a name="recognizer"></a>
+<h3 class="subsub"><img src="pixmaps/shapes.png"> The shape recognizer</h3>
+<p>
+ The shape recognizer is also a special
+ operating mode of the pen and highlighter tools. When it is enabled,
+ Xournal attempts to recognize geometric shapes as they are drawn, and
+ if successful will replace the drawn strokes accordingly. The shapes
+ that can be recognized are: line segments, circles, rectangles, arrows,
+ triangles and quadrilaterals. Polygonal shapes can be drawn in a single
+ stroke or in a sequence of consecutive strokes.
+</p>
+<p>
+ The recognizer is set to be as unobtrusive as possible, and should not
+ interfere too much with handwriting. (It differs in this and other ways
+ from another shape recognizer written for Xournal by Lukasz Kaiser).
+ As a result, it may only recognize shapes if you draw them carefully and
+ deliberately. Specific tips for better recognition: (1) for circles,
+ a closed curve that isn't quite round works better
+ than a rounder curve that doesn't close; (2) for arrows, it is better
+ to lift the pen before drawing the tip of the arrow, and make sure
+ the tip consists of two straight line segments;
+ (3) for very elongated rectangles,
+ recognition tends to be better if you lift the pen between consecutive
+ sides.
+</p>