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<!--
//-----------------------------------------------------------------------------
// Copyright (C) 2002-2019 Thomas S. Ullrich
//
// This file is part of "xyscan".
//
// This file may be used under the terms of the GNU General Public License.
// This project is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License.
//
// Author: Thomas S. Ullrich
// Last update: September 26, 2019
//-----------------------------------------------------------------------------
-->
<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>Rotating and Scaling Plots</title>
<body style="font-family: Arial, Helvetica, sans-serif, Geneva">
<h2>Rotating and Scaling Plots</h2>
<p>At times, all that
is available are old distorted photo copies of plots. <em> xyscan</em>
assumes perfectly aligned plots (i.e., not tilted w.r.t. the vertical or horizontal).
Scanning tilted plots would require precisely aligned markers in x <b>and</b> y for each point
making the scanning of perfectly aligned plots (99% of all cases)
more cumbersome. Instead <em>xyscan</em> allows to rotate a plot
once it is loaded <em>before</em> setting the markers.
To do so, use the spin box (circled red below)
in the <em>Plot Info and
Adjustment</em> tab in the Tool Box. Units displayed are in
degrees. Use the cross-hair to check for horizontal and/or
vertical alignment. For increased precision launch the <em>Cursor Zoom</em> window. The plot rotates around its center. Rotating
a plot is disabled once a marker is set. </p>
<p align="center"><img src="adjustment.png" width="473" border="0" /></p>
<p>Note that <em>xyscan</em> cannot
handle distorted plots of any kind other than tilts. It is strongly
recommended to correct distortions <b>beforehand</b> using one of the
many graphics manipulation programs on the market.</p>
<p>For convenience
you can also scale (zoom in/out) the plot using the right spin
box (circled blue above). Note, that zooming in will typically <strong>not</strong> increase
the precision of the scan although it eases setting the markers precisely. Here the <a href="cursorzoom.html">Zoom Window</a> comes in handy.</p>
</body>
</html>
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