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Hi,

I'd like a bubble chart. I've started tinkering but it's taking me a while to get my head around the structure of charts, and what I need to extend etc to get something working. I'd appreciate some pointers...

At the moment I've extended CartesianSeries to make a Cartesian3DSeries (prob a bad name, but anyway). This adds some 'z' attributes - zDisplayName, zcoords, zKey, zData, zAxis, and my intention is that it'll overwrite or add methods that refer to xAxis and yAxis to also do stuff with zAxis.

Then there's a BubbleSeries which extends Cartesian3DSeries. My thought is that there are various ways to represent the third dimension - bubbles are one; but you might also want colours, shapes, changing widths of bars (ie an area chart). So you could extend Cartesian3DSeries for these different cases (perhaps).

There's also a zAxis that extends NumericAxis, although I realise this is probably not correct in general - you might have categorical data for the z axis. At the moment zAxis just has a _drawAxis function that does nothing, and a 'styleFunction' attribute.

My thought was that in the setAreaData method of Cartesian3DSeries, it sets the x and y co-ords as in CartesianSeries, and then calls styleFunction, passing it the graphic and the z value of the current point. styleFunction would then change the style of the graphic based on the value.

It's not working; I've not got far enough, but I've got sufficiently far to have significant doubts about whether this is a sensible way to proceed - whether it's got any chance of working, basically!

What would be really helpful, and what I might even do if I get time and round to it, is an overview of the charts class structure - there's quite a lot, and I've found it moderately difficult working out what does what, and so what I need to add/change/extend etc.

Thanks,

Matt

Hi Tripp,

That's fantastic, thank you very much. I'll have a play and come back with any comments.

I think I'd missed position: none as a possible value, so the only reason to create a new axis was to stop it rendering!

My feeling is that Charts has a lot more power than it lets on... I'll keep playing, and I watched Luke's video about contributing documentation, so I might have a go at writing some docs or examples...

thanks again

Matt