📄 measuring.htm
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<title>Measuring lengths and areas</title>
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<a href="./index.htm">CONTENTS</a>
<h3>Measuring lengths and areas.</h3>
<p>If you draw a curve, line, polygon, or another shape J-Painter can show
their length or dimension, and area (which is applicable). The values are displayed
in the browser's status line. To activate this function set the DrawCanvas
parameter <code>measure_show</code>
<pre>
<param name="measure_show" value="true">
</pre>
By default, the values are displayed in pixles. If you want to see them
in other units, such as: inch, foot, or mile, you have to define unit/pixel ratio
using the parameter <code>measure_scale</code>.
<br />Example:
<pre>
<param name="measure_scale" value="0.2" >
</pre>
If you want to see specific number of digits and the unit name
use the parameter <code>measure_scale</code>.
<br />Example:
<pre>
<param name="measure_format" value="#.# ft">
</pre>
You can specify different formats for linear and areal values separating them by semicolon.
The first format is used for linear values, the second one for areal values.
<br />Example:
<pre>
<param name="measure_format" value="#.# ft; #.# sq'.'ft ">
</pre>
If only one format is specified it's used for both linear and areal values.
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