Dear Judson, thanks a lot for the patch. It works nicely. it is exactly what I was looking for.
Regarding the buy and sell positioning. I would actually, given the overall limitations I would prefer it as it is over a "snapped" representation. This way, one can roughly estimate where the buy / sell was and if multiple fall into the gap, you see even the order.. Klaus On 9 Jun., 04:28, Judson Wilson <[email protected]> wrote: > Also notice that there is a built in volume charting capability.. maybe > something worth looking into? > > On Wed, Jun 8, 2011 at 7:23 PM, Judson Wilson <[email protected]>wrote: > > > > > > > > > On Wed, Jun 8, 2011 at 6:44 PM, nonlinear <[email protected]>wrote: > > >> Judson, if you find time and motivation, perhaps you could do something > >> about the other mildly annoying chart problem. Look at the attached chart. > >> Notice how the "buy" and the "sell" annotations are positioned? It looks > >> odd > >> because the annotations are not on the price line. The chart is in fact > >> totally correct, but because the price resolution is 5 minute OHLC bars and > >> the executions are plotted with a 1-second resolution, they seem to exist > >> as > >> independent entities. I think the right way to handle it is to "snap" the > >> "buy/sell" annotations to the corresponding price bar. > > >> What do you guys think? > > > In my opinion, the "correct" thing to do would be to make the width of the > > bars such that there is very little gap between them. Then the bubble would > > appear to occur somewhere in the middle of the bar. This might be terribly > > ugly, though. > > > Actually, here is a quick implementation for that effect. Note it is > > HORRIBLY SLOW because JFreeChart is a turd, performance wise, in general, > > but this auto-width calculation method for the candles re-computes the width > > for each individual bar, by sifting through the dataset and looking for the > > smallest bar spacing (again, it does this calculation for every bar). This > > could be implemented by hand because we already know the bar width, which > > would be much much faster. > > > Anyways, here is the replacement chunk of code, which can easily be tweaked > > to look a little bit better. You must zoom in substantially to see the > > effect: > > > private void createChart() { > > CandlestickRenderer candleRenderer = new CandlestickRenderer(-1); > > candleRenderer.setDrawVolume(false); > > > candleRenderer.setAutoWidthMethod(CandlestickRenderer.WIDTHMETHOD_SMALLEST) > > ; > > candleRenderer.setAutoWidthGap(0.0); > > candleRenderer.setAutoWidthFactor(1.0); > > candleRenderer.setUpPaint(Color.GREEN); > > candleRenderer.setDownPaint(Color.RED); > > candleRenderer.setSeriesPaint(0, new Color(250, 240, 150)); > > candleRenderer.setBaseStroke(new BasicStroke(1)); -- You received this message because you are subscribed to the Google Groups "JBookTrader" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jbooktrader?hl=en.
