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Draw a pie / ring chart
A pie chart, or pie graph, is a circular statistical graphic that's divided into slices to illustrate numerical proportion. In a pie chart, the arc length of each slice (and consequently its central angle and area) is proportional to the quantity it represents. A ring chart, also known as a donut chart, is essentially a pie chart with a hole in the center. This hole makes the chart look like a donut, hence the name.
Parameters
Elements / attributes of the <piechat> element:
Coordinate parameters (required) that define the print area of the pie chart
<x1> Starting X coordinate (upper/left corner)
<y1> Starting Y coordinate (upper/left corner)
<x2> Ending X coordinate (bottom/right corner)
<y2> Ending Y coordinate (bottom/right corner)
Parameters that define the appearance of the graph:
<border> Show or hide border. Possibile values:
0 Disable (hide) border
1 Enabled (show) border
1111 Enabled (shows) the border for each side of the frame area (left, top, right, bottom). You can show/hide each side of the border individually.
<radius> Graph radius (0 : auto, the radius will be calculated so that the graphic fills the print area while maintaining the proportions of a circle)
<style> Graph stype. Possible values:
CLASSIC or DEFAULT : Pie chart style
RING or DONUTS : Ring chart style
<legend> Optional chart legend (if defined)
Optional parameters:
<printif>: A simple expression prints this graphic element only if it evaluates to true. If it is not defined, the element is always printed.
The expression must be written using placeholders or constants and one of these comparison operators:
= (identical)
> (greater than)
< (less than)
>= (greater than or equal to)
<= (less than or equal to)
!= (not equal to)
Examples of expressions using placeholders/constants:
{data_set.doc_type}=1
{data_set.level}>={MIN_LEVEL}