[Lazarus] TAChart CandleStick Chart

[Kamen Ketev]

Thank you for adding CandleStick Chart!
 
I have 2 questions: 
In OHLC tails are in the same color like body but in CandleStick is not. When I change background to black tails hides. How can I make color of the tails like body? Maybe in
CandlestickLinePen add option to copy color from body? 
When I add big portion of data for example 2 years all period are in screen and
 CandleStick are too small. How can I add HorzScrollBar or something like this and keep the scale of 
CandleStick? I can zoom it but I want to scroll back to earlier time period. 
Kamen
 




-------- Оригинално писмо --------
От:  Werner Pamler  
Относно: [Lazarus] TAChart CandleStick Chart
До: lazarus at lists.lazarus.freepascal.org
Изпратено на: Вторник, 2014, Септември 16 22:09:11 EEST


In r46244 the TOpenHighLowCloseSeries has a new property "Mode": 

selection "mOHLC" does the standard painting as before while 

"mChandleStick" paints the candlesticks that you requested. Since your 

code was mostly a copy of existing code I decided to stick to the old 

series type, but just add the painting modes. There are also properties 

"CandleStickUpBrush", "CandleStickDownBrush" and "CandleStickLinePen" to 

control painting of the up and down bars and the border and shadow line. 

I also added a little demo "financial" to the "demo" folder of the 

TAChart installation which demonstrates both modes. It would be nice if 

you could have a look if everything is fine - I'm not an expert in 

financial charts.



I also fixed the bug which ignored the true minimum of the data - 

therefore, it is no longer necessary to calculate the minimum by 

yourself, just have a look at the code in the demo project. And, 

finally, I modified the AddXOHLC method such that it automatically 

initializes the size of the YCount of the chart source if the current 

size would not be enough.



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