Japanese Candlesticks with Roassal

> On May 23, 2015, at 9:57 PM, Stefan Krecher <[hidden email]> wrote:
>
> Milton,
> thank you so much - I wasn't aware of that RTBoxPlotDataSet but managed to load it after a quick google research.
> It looks almost perfect - adding color shouldn't be that complicated. And I would need to ged rid of these horizontal lines on top of the wicks.
> Thank you for sending me to the right direction!
> Regards
> Stefan
>
> 2015-05-23 18:19 GMT+02:00 milton mamani <[hidden email]>:
> Hi Stefan in Roassal2 there is Boxplot, similar as you want.
>
> | b createList r d today |
> r := Random new.
> createList := [ :size :d1 :d2 | (1 to: size) collect: [ :i | d1 + (r next * (d2-d1))] ].
>
> b := RTGrapher new.
> today := d := Date today.
> (1 to: 10) do: [ :i | | ds |
> ds := RTBoxPlotDataSet new.
> ds points: (createList value: 20 value: 0 value: 20).
> ds model: d.
> ds x: [ :date| date julianDayNumber - today julianDayNumber + 1 ].
> b add: ds.
> d := d next.].
> b build.
> ^ b view.
>  
> Try to create a subclass of RTAbstractDataSet, such as RTCandlestickDataset
>
> Cheers,
> Milton
>
>
> 2015-05-23 6:54 GMT-04:00 Stefan Krecher <[hidden email]>:
> Hi,
> I just started to get into Roassal (with Pharo 4.0) with the goal to visualize financial data like forex charts.
> The common visualization is by using japanese candlesticks [1]
> Because there is not predefined TRShape/ RTShape, I would need to create those shapes on my own.
> I suspect that this task can't be too complicated but because I'm that very new to Roassal, I'm asking for some hints and maybe code examples.
> The data needed to visualize one candlestick consists of a few numbers, e.g.
> 20150501 001300;1.120890;1.120910;1.120890;1.120900;0 (-> downloaded from [2])
> First two numbers are Date and Time, the next four Numbers are: open, high, low, close, that last one is the volume and can be omitted.
> There is a bar to describe the price movement (open/ close) and wicks that describe the highest course and the lowest course during that time frame.
> The above data describes a One-Minute-Candle.
> So I'd really appreciate if anyone could give me hints or send me to the right direciction.
> regards
> Stefan
>
> [1] http://en.wikipedia.org/wiki/Candlestick_chart
> [2] http://www.histdata.com/
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