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<!--
//-----------------------------------------------------------------------------
// Copyright (C) 2002-2017 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: Nov 21, 2017
//-----------------------------------------------------------------------------
-->
<html>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8" />
<title>Moving the Cursor</title>
<body style="font-family: Arial, Helvetica, sans-serif, Geneva">
<h2>Moving the Cursor</h2>
<p>Once the plot
is loaded, two thin lines become visible (see screenshot below).
In the following they are referred to as <i>cross-hairs.</i> Both lines
are exactly one pixel wide. The intersection between the vertical
and the horizontal line defines the <i>cursor</i> position. The current <i>x,y</i> coordinates
of the cursor are displayed in the <i>Coordinate Display</i> tab in the Tool Box.
Move the cursor (cross-hair) using the <tt>arrow-up</tt>, <tt>arrow-down</tt>,
<tt>arrow-left </tt>and <tt>arrow-down</tt> keys.
The step size is 1 pixel. If you want to move the cursor faster
(in larger increments) press the <tt>Shift</tt> key together with the respective <tt>arrow</tt> key.
Alternatively you can also use the mouse. Press the left mouse
close to the cursor, <em>i.e.</em>,
the intersection of the cross-hair lines, and drag it while keeping
the mouse button pressed. Even quicker is double-clicking the
left mouse button to make the cross-hair step to the current mouse/pointer
position. On
some platform/screen combinations and depending on your screen settings, step sizes smaller
than one pixel are possible using the <tt>Alt</tt> (<tt>Option</tt>) key
together with the referring arrow key. This is useful for increasing the precision for
good quality plots. The cursor moving options are summarized in the table below.
<div align="center">
<table width="440" border="1" align="center" cellpadding="3" cellspacing="0">
<tr>
<th width="153" scope="col" bgcolor="#1006b8"><font color="white">Keys</font></th>
<th width="268" scope="col" bgcolor="#1006b8"><font color="white">Steps</font></th>
</tr>
<tr>
<td>arrow</td>
<td>normal, 1 pixel</td>
</tr>
<tr>
<td>shift+arrow</td>
<td>fast, 10 pixel</td>
</tr>
<tr>
<td>alt(option)+arrow</td>
<td>fine, 0.1 pixel (where available)</td>
</tr>
<tr>
<td>left mouse button drag</td>
<td>arbitrary</td>
</tr>
<tr>
<td>double mouse click</td>
<td>to position</td>
</tr>
</table>
</div>
<p>Depending on the color
scheme of your plot, the red default color of the cross-hair might be not
the best choice. The color can be changed via the <code>Edit->Cross-hairs Color...</code> menu item. Pick a color that contrasts well with the color of the data points and the background.</p>
<div align="center">
<p><img src="crosshair.png" width="478" border="0" /></p>
</div>
<p align="left"><strong>Hint:</strong> For
moving the cursor quickly over the plot the mouse & double-click
is certainly faster but use the arrow keys when placing the
markers and especially when placing the cursor for the actual
scan.</p>
</body>
</html>
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