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<title>Ipe Manual -- 8 Page views</title>
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<table width="100%" cellpadding=0 cellspacing=2><tr><td bgcolor="#99ccff"><a href="manual_30.html"><img border="0" alt="9 Writing ipelets" src="next.png"></a></td><td bgcolor="#99ccff"><a href="manual.html"><img border="0" alt="Top" src="up.png"></a></td><td bgcolor="#99ccff"><a href="manual_28.html"><img border="0" alt="7 Style sheets" src="previous.png"></a></td><td align="center" bgcolor="#99ccff" width="100%"><b>8 Page views</b></td></tr></table>
<h1>8 Page views</h1>
<p>When making a PDF presentation with Acrobat Reader, one would often
like to present a page incrementally. For instance, I would first like
to show a polygon, then add its triangulation, and finally color the
vertices. <em>Page views</em> (or simply <em>views</em> in the following)
make it possible to do this nicely.
<p>An Ipe document consists of several pages, each of which can consist
of an arbitrary number of views. When saving as PDF or Postscript,
each view generates a separate PDF/Postscript page (if you only look
at the result in, say, Acrobat reader, you cannot tell whether two
pages are actually two views of the same Ipe page or two different Ipe
pages).
<p>An Ipe page consists of a number of objects, a number of layers, and a
number of views. Each object belongs to exactly one layer. A layer
can be shown by any number of views--a view is really just a list of
layers to be presented. In addition, a view keeps a record of the
current active layer--this makes it easy to move around your views
and edit them. Finally, views can specify a <em>transition style</em>,
a graphic effect to be used by the PDF viewer when proceeding to the
following PDF page.
<p>To return to our polygon triangulation example, let's create an empty
page. We draw a polygon into the default layer "alpha." Now use
the <em>New layer, new view</em> function (in the <em>Views</em> menu),
and draw the triangulation into the new layer "beta." Note that the
function not only created a new layer, but also a second view showing
both "alpha" and "beta". Try moving back and forth between the
two views (using the PageUp and PageDown keys, or the little buttons
on the <em>View</em> counter). You'll see changes in the layer list on
the left: in view 1, layer "alpha" is selected and active, in
view 2, both layers are selected and "beta" is active. Create a
third layer and view, and mark the vertices. In the <em>Document
properties</em> (in the <em>Edit</em> menu), turn <em>cropbox</em> off and
<em>fullscreen</em> on, and save in PDF format. Voila, you have a
lovely little presentation.
The result is available <a href="polygon.pdf">here</a>.
<p>In presentations, one often has slides with mostly text. The
<a href="manual_17.html">textbox</a> object is convenient for this, as one
doesn't need to use the mouse to create it. To create a slide where
several text items appear one by one, one only needs to press F10 to
create a textbox, then Shift+Ctrl+I to make a new view, F10 again for
the next textbox, and so on. Finally, one moves the textboxes
vertically for the most pleasing effect (<em>Shift+Ctrl+Middle
Mouse</em> does a constrained vertical move, or <em>Shift+Left Mouse</em>
in <em>Move</em> mode).
<hr />
<table width="100%" cellpadding=0 cellspacing=2><tr><td bgcolor="#99ccff"><a href="manual_30.html"><img border="0" alt="9 Writing ipelets" src="next.png"></a></td><td bgcolor="#99ccff"><a href="manual.html"><img border="0" alt="Top" src="up.png"></a></td><td bgcolor="#99ccff"><a href="manual_28.html"><img border="0" alt="7 Style sheets" src="previous.png"></a></td><td align="center" bgcolor="#99ccff" width="100%"><b>8 Page views</b></td></tr></table></body></html>
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