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 measure_show
<param name="measure_show" value="true">
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 measure_scale.
<param name="measure_scale" value="0.2" >
If you want to see specific number of digits and the unit name
use the parameter measure_scale.
<param name="measure_format" value="#.# ft">
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.
<param name="measure_format" value="#.# ft; #.# sq'.'ft ">
If only one format is specified it's used for both linear and areal values.