Hi Oliver, If you are overriding the updateDisplayList function in your custom itemRenderer, you can change the height that is drawn there; if it is less than the minimum value that you want. I haven't tried this, so I'm not sure how the other chartItems in the stack will be effected. But, it's worth a try.
-TH --- In [email protected], "oliver langan" <[EMAIL PROTECTED]> wrote: > > I have a stacked column which displays the traffic to a web site from > various sources (referrals, advertising, etc). Each stack represents > a single week, and the different stacked series therein represents a > source. I created a custom renderer to have a label within the actual > chart element itself, to show the source name and percentage, and a > custom datatip renderer as well to show the underlying raw data as > well as inviting the user to click for more info (displayed in a > separate component). > > Some of the sources may only have a very small percentage of the > overall traffic. These are displayed as very thin hairlines, which > are difficult or impossible to click and sometimes not even visible. > I have tried setting the 'minHeight' attribute of the ColumnSeries, > but that seems to be geared towards floating columns and in any case > does not seem to be used for stacked and 100% type charts. > > What I want is for the stacked elements to have a minimum size which > is large enough for a label and for clicking. These would not be > representative of the actual data, though it should be for larger > chart elements. I don't think I can accomplish this with a > ChartItemRenderer, since the parameters which are passed to it are the > already-determined height and width. > > I can think of two ways to accomplish this, and would love to hear > feedback on them as well as more suggestions if you have any. The > first is to create a 'shadow series' which contains modified data > which will draw the chart elements at a large enough size. Since I > already have custom renderers for the chart item and datatip, these > could know how to correlate this with the real data, and show the > correct percentages/numbers/etc. > > The second idea I had was to create a custom non-chart component. > Since the labeled-state is actually a zoom-in on a single week (i.e., > only one column is shown at a time), the component could essentially > have the real data as its dataprovider, but could calculate the total > and dynamically make small items large enough to be seen. The > drawback to this is that I lose the datatip functionality, and it > might be difficult to access the chart styles to make it visually > match the four-column (zoomed out) display. > > (I suppose a third idea would be to display in a table, not a chart: > but the client is not going to go for that.) > > Any comments would be appreciated. > > oliver >
