RailwayRouteOptimization/scripts/Widgets/CommandLine/doc/CommandLine_desc_en.html

<div>
<p>The command line of QCAD allows you to start commands, enter coordinates or
enter values such as distances or radii.</p>

<h3>Entering Coordinates</h3>

<p>
Absolute coordinates are entered in the format "x,y":
</p>

<p class="code">
40,5
</p>

<p>
Relative coordinates are entered in the format "@x,y":
</p>

<p class="code">
@10,6
</p>

<p>
Absolute polar coordinates are entered in the format "distance&lt;angle":
</p>

<p class="code">
10&lt;30
</p>

<p>
Relative polar coordinates are entered in the format "@distance&lt;angle":
</p>

<p class="code">
@10&lt;45
</p>

<p>
When entering coordinates or values, <a href="#expr">mathematical expressions</a> 
may be used to calculate a coordinate based on known values. For example the 
coordinate 10,5 may also be entered as:
</p>

<p class="code">
5+5,30/6
</p>

<h3>Calculator</h3>

<p>
The command line can also be used as a calculator. To do this, enter a 
<a href="#expr">mathematical expression</a> proceeded by an equal sign:
</p>

<p class="code">
=3+4<br/>
7
</p>

<p>
Variables may be used to store values:
</p>

<p class="code">
=a=5+6<br/>
11<br/>
=a/2<br/>
5.5<br/>
</p>

<a name="expr"></a>
<h3>Mathematical Expressions</h3>

<p>Mathematical constants available are:</p>

<p class="code">
PI, LN2, LN10, LOG2E, LOG10E, SQRT1_2, SQRT2
</p>

<p>Mathematical functions available are:</p>

<p class="code">
abs, ceil, floor, exp, log, max, min, pow, sqrt, random, round, rad2deg, deg2rad, 
sin, cos, tan, asin, acos, atan, atan2, log10, log1p, log2, sign, cosh, sinh, tanh,
acosh, asinh, atanh, expm1, hypot, cbrt, trunc
</p>

<p>Most of these constants and functions are standard ECMAScript (JavaScript) functions and 
documented online. In standard ECMAScript, these functions are part of the Math class so the 
function <i>abs</i> would have to written as <i>Math.abs</i>. In the QCAD command line, you can 
leave away the <i>Math.</i> part for convenience. Trigonometric functions (sin, cos, tan, asin, acos, atan, atan2) 
accept or return angles in degrees. If you prefer the radian versions of these functions, 
use the original <i>Math.</i> functions instead.</p>

<p>The functions <i>rad2deg</i> and <i>deg2rad</i> can be used to convert angles between 
radian and degrees.</p>

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