Fighting with charts..... - Trading Software

Fighting with charts.....

Juliettpapa
2011-07-11 14:18:52

I can not center this chart. Not even with my smoothest mouse moves... :-)

http://screencast.com/t/lXWXQh2vR

Maybe you can add "center chart" buttons like these:

http://screencast.com/t/FqFDcfqnIbp

One for "short term", one for "long term" (customizable of course- maybe 20 bars and 100 bars......)

Regards
jp

QuantShare
2011-07-12 15:12:17

Best Answer

This is because the lower bollinger band in your chart returns negative values. The log scale converts the min-scale value to 0.00001 by default.
Centering for log scales will be improved.

You can also update the min scale using the following function:
SetMinScale(0.5);

Or you can ignore scaling for bollinger bands:
plot1(up, down, "bb up", "bb down", colordarkred|22|colordarkred|32|298, colorgreen, colorred, chartline, stylesymbolnone|StyleNoScale);

Regarding the "long term" and "short term" buttons, you can add two shortcuts in the bookmark panel.

For example, the first shortcut will execute a script that updates the number of bars displayed in the current chart. (Tools -> Script Editor)

Chart chart = Charts.GetSelectedChart();
if(chart != null)
{
chart.ScrollBarNbQuotes = 2000;
}

Juliettpapa
2011-07-12 17:36:32

Good tips above. But when using the 200bars and 2000bars buttons the result is not the best:

200 bars: chart must show LAST 200 bars
2000 bars: chart not centered (price, time) look: http://screencast.com/t/r6D4pQUWkqwW

Generally: When changing the value of bars displayed, the chart should center AND stretch itself to fit the time-price window best

Regards
jp

QuantShare
2011-07-13 07:51:24

Add the following line to your script: (Just after "chart.ScrollBarNbQuotes")

chart.ScrollBarIndex = chart.NbQuotes;

Juliettpapa
2011-07-13 09:03:51

Works! Thanks.

A "automatic center chart" would be helpful anyway.

Regards
jp

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