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// Copyright (C) 2002-2017 Thomas S. Ullrich
//
// This file is part of "xyscan".
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// Author: Thomas S. Ullrich
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>Coordinate Systems</title>
<body style="font-family: Arial, Helvetica, sans-serif, Geneva">
<h2>Coordinate Systems</h2>
<p><em>xyscan</em> uses 2 coordinate systems:</p>
<dl>
<dt><u>Local Coordinates</u>
</dt><dd>These are essentially the screen
coordinates of the window in which the plot is displayed. The units are screen pixel. The upper left corner of the plot is defined as the origin (0,0) of the plot. <em>x</em> increases to the
right, <em>y</em> increases downwards. They are displayed on the top of the <em>Coordinate Display</em> window once a plot is loaded.
</dd><dt><u>Plot Coordinates</u>
</dt>
<dd>These are the coordinate of the plot/data points you want to scan. In order to transform local coordinates into plot coordinates, <em>xyscan</em> needs <a href="markers.html">markers</a> to
be set along the axis and needs to know if the axis have a linear or logarithmic scale. The user has to provide the position
of the markers in plot coordinates.</dd></dl>
</body>
</html>
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