In the simplest usage
displays an arc representing 70% of a complete circle. The circle is always drawn centred on a 9-o'clock position; a 50% completion would fill from 6 through 9 to 12.
Additional optional arguments allow specification of a minimum value, a maximum value, and a target value.
All four inputs may be a literal number, an attribute's value or the result of a simple action code expression.
value is a number (between min and max). Progress, as shown by value, is plotted in $PlotColor.
min is the minimum value number (default: 0).
max is the maximum value number (default: 100).
target (no default) is a desired target value (for value) between min and max and which may be smaller or greater than value. If a target is desired, min and max must also be specified. Target is plotted as two narrow black lines, centred as per the progress bar. target is always drawn in $PlotBackgroundColor.
Example with all inputs
ring(70, 0, 100, 50)
where the progress is 70%, exceeding the 50% target. The same could be computed:
ring($MyValueNumber, $MyMinNumber, $MyMaxNumber, $MyTargetNumber)