SVGGraph 2.21
Published
This is a relatively small update to SVGGraph, mainly because I'm trying to release updates more often instead of saving up a bunch of changes to release all at once. So this version is centred around the best-fit or trend lines.
Until now these lines were only supported by the scatter graphs, but now the
line graphs support them too. The example graph above has four datasets and four
best-fit lines, though the green and blue datasets are using the new
best_fit_range and best_fit_project options. The
best_fit_range option lets you specify the range of values to be
used in calculating the angle of the best-fit line, and
best_fit_project tells SVGGraph which bits of the line outside the
range to draw.
By default the projected part of the line is drawn with a 4-pixel dash pattern,
but there are best_fit_project_dash, best_fit_project_colour,
best_fit_project_width and best_fit_project_opacity
options for changing its appearance. There is some more explanation on the
scatter graphs page.
Moving onto the other changes in this version, I've merged in some submitted
code that allows pie graphs with repeated keys. I've fixed an error when using
a strange dataset_axis setting and a single dataset, and made the
image markers support absolute URLs.
The new version is available from the downloads page, or from GitHub, or using Composer.