Question

What functions are there to customise the graph, for example the width of the bars and the spaces between the bars.
I would like to reduce the gaps between the bars, and between the month labels.

What are there any functions that can perform these alterations?

Answer 1

The solution is simply to adjust the width of the columns (and possibly the graph itself).

You can use the function BarPlot::SetWidth($aWidth) to set the column width (see also this example). This function is described in the class documentation here:

Specify width as fractions of the major step size when the scale used is a text scale (which is the normal scale to use for bars). If the X-axis scale is a linear scale (i.e. lin, int or date) then the width must be specified in absolute pixels.

Therefore you can either set the width of the columns as a percentage or as an absolute pixel width.

• To set the width as a percentage, use a value <= 1.
  e.g. 25% $barplot->SetWidth(0.25);

• To set the width in pixels, use a value > 1.
  e.g. 56 pixels $barplot->SetWidth(56);

Have a fiddle around until you get something you’re happy with.