Graph OnMouseOver events...

mojiro · Post by **mojiro** » Wed Sep 02, 2009 6:34 am

I will suggest some new features for the graphs using javascript.

Let's say that we are viewing a graph, we are able to zoom-in it selecting an area.

Why not, be able to view the timestamp that the mouse is over and moreover the graph values.

Post by **TheWitness** » Wed Sep 02, 2009 7:52 am

FlashChart's do this pretty well. I don't know about here. There are some complexities to this.

TheWitness

Post by **gandalf** » Sat Sep 05, 2009 1:31 pm

mojiro wrote:I will suggest some new features for the graphs using javascript.

Let's say that we are viewing a graph, we are able to zoom-in it selecting an area.

Why not, be able to view the timestamp that the mouse is over and moreover the graph values.

The main reason to this is, that there is no builtin rrdtool support for this. And there's no interface to rrdtool to get the timestamp out of a png-relative position of a mouse pointer.
Reinhard

mojiro · Post by **mojiro** » Sun Sep 06, 2009 5:36 am

gandalf wrote:
mojiro wrote:I will suggest some new features for the graphs using javascript.

Let's say that we are viewing a graph, we are able to zoom-in it selecting an area.

Why not, be able to view the timestamp that the mouse is over and moreover the graph values.
The main reason to this is, that there is no builtin rrdtool support for this. And there's no interface to rrdtool to get the timestamp out of a png-relative position of a mouse pointer.
Reinhard

how the zoom-functionality works ?

Post by **rony** » Sun Sep 06, 2009 10:35 am

Some trickery to figure out where your mouse cursor is in relation to the image. Which changes depending on the version of RRDtool.

Post by **gandalf** » Sun Sep 06, 2009 1:26 pm

rony wrote:Some trickery to figure out where your mouse cursor is in relation to the image. Which changes depending on the version of RRDtool.

...and which is not as exact as you may want for your original request
Reinhard

Howie · Post by **Howie** » Sun Sep 06, 2009 3:20 pm

gandalf wrote:
rony wrote:Some trickery to figure out where your mouse cursor is in relation to the image. Which changes depending on the version of RRDtool.
...and which is not as exact as you may want for your original request
Reinhard

And still doesn't help with retrieving the actual value at that time in a fast-enough way to be interactive.

Post by **gandalf** » Mon Sep 07, 2009 2:23 pm

It may be worth discussing this with Tobi Oetiker ...
Reinhard

Howie · Post by **Howie** » Mon Sep 07, 2009 2:36 pm

It's also worth taking a look at nfsen, which appears to do pixel-accurate time extraction from it's rrd files. No y values, but accurate x. Nice tool, too!

Post by **TheWitness** » Mon Sep 07, 2009 7:13 pm

With newer version of RRDtool, where you can define the outer boundary of the graph, you can do this all in Javascript. The problem we had before Tobi provided that option was that we had to approximate the location of the start of the graph-able area by taking the font size and the presence of a legend and fudging it.

However, if we support the new graph area parameter as a mandatory one, we should be able to do the zooming of multiple graphs at once.

Larry

Cacti

Graph OnMouseOver events...

Graph OnMouseOver events...

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