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Set the appearance of any chart notes.
ch.Set 'nstyle' 'boxed'
Options
opaque:transparent ... Blank area behind notes
boxed:nobox ... Draw box around note
shadowed:noshadow ... Shadow note box
rounded:square ... Corner style
left;centre;right ... Text alignment
relative;absolute ... Note placement
pitch=120% ... Set the line-spacing for multi-line notes
effect=id ... Apply a defined effect to the note text
Options in bold are the normal defaults. Normally, notes are positioned relative to the current (x,y) axes (style ‘Relative’) but you can choose to use absolute coordinates here, in which case you give the position of the note in Points from the chart origin (the position where the axes would normally cross). For multi-line notes, the position gives the start of the baseline of the first line of the text. The ‘pitch’ style determines where subsequent lines appear (default 120% of font size).
To include a defined effect (such as an SVG shadow filter or animation) to the text, give the effect id here:
ch.Set 'Nstyle' 'effect=98'
You can list multiple effects (chained with ‘+’) to apply several filters or animations to the note. This could be used to have a note slide in from the side, then change colour or fade out.