Zoomable graphs

Anonymous sourceforge request:

please make available the feature of zooming graphs like in cacti - If i press the mouse over an graph, select a period and release the button, the graph reload with the selected interval so it zooms in for the selected period.

Interestingly rrd 1.2 supports SVG graphics

Actually, one would gain a lot by just using SVG, as modern browsers would provide zooming capabilities. You wouldn't get an excerpt, but you could zoom. So, if you could just use the SVG output, that would be great.

Native SVG support is not available on all OSes, but I suspect most Munin users would have it, and it is relatively easy to provide a fallback.

The SVGs produced by both rrd 1.2 and 1.3 are unsuitable for zoomable graphs. To fix rrd 1.3 we first have to patch libcairo the graphics library to support id= attributes on graph features, and then fix rrd 1.3 to use this.

• The graph itself should have a independent translation matrix
• The x-axis should be zoomed only along the x-axis
• The y-axis should be zoomed only along the y-axis
• Each of them should be enclosed by clip boxes

Then we can zoom the graphs in a sensible manner. The next step is mouse over handling that shows the legend name of the point, the value at the graph point, and the time of collection. And if it's averaged maybe the max reading of the time period of averageing.

Nicolai

Is there any progress on this feature? We would really like to see this in next release. Thank you.

http://insom.me.uk/z/2009/06/zoomable-munin-graphs.html

I've gotten zoomable graphs working. It's rough around the edges, but I'd love to see someone pick it up. It certainly suits my purposes right now.

A patch for zoomin to make right-to-left-select in graphs

Modified zoom.js, zoom.php, patch for GraphOld?.pm(1.4.0) included

Since we have a patch (and Steve Schnepp is also working on this) I'm planning to take it into the 1.4 series.

Replying to snide: I'm planning it more for 1.5 than for 1.4, but maybe, who knows :-)

I uploaded a pure Perl patch here : http://munin.projects.linpro.no/attachment/wiki/Munin_other_native_transports

It's a rewrite of my old 1.2 zooming graph one since it was faster this way. I'll have a look at the attached one also to enhance mine and to have the best of both :-)

closed by r3376