SVGGraph 3.1 adds a few new things, the most significant being support for
subgraphs, something that should make the
EmptyGraph a bit more
Subgraphs are basically entire graphs drawn on top of a parent graph. They can inherit the parent graph's settings, or have their own settings. Likewise, they can inherit the colours or have their own colour set. They don't inherit data values or lists of links though, because each graph can deal with its data in very different ways.
For the example above, the main graph is a
PieGraph is a separate subgraph. I tried to come up with a
vaguely useful-looking example, so here the pie graphs show the proportions of
each of the bars underneath, something that is less obvious from looking at the
Using subgraphs is not too difficult, but I have created a new web page to explain how to do it: the subgraphs page.
The next new feature that you probably noticed if you moved your cursor over
the graph is magnification. There are two new options for this:
turns on magnification and sets the magnification factor (the example is magnified
× 1.5) and
magnify_pan specifies how sensitive the magnified
area is to mouse movement.
SVGGraph already had support for user-defined patterns, but it meant writing your own SVG code and pasting it in. Version 3.1 adds support for using SVGGraph figures as patterns, which should hopefully be easier than rolling your own SVG.
Tweaks and things
SVGGraph 3.1 has a new algorithm for choosing the Y-axis divisions, which should provide a more friendly-looking graph by default. Before, it could pick values like 1.9 for its divisions, and really had trouble with prime numbers and graphs that were more negative than positive, but now it should cope with these a lot more cleanly.
The new version of SVGGraph is available from the downloads page, or from GitHub / Packagist with Composer.