Dukascopy Support Board • View topic

mrmiyagi

Hello,

Can you tell me, how can I get the current price of a ShortLine f.e. in the onTick function?
I catched the ShortLine (IChartObject), but I don't find any function about the price (just start and end price)

Thank your for your answer

API Support

Could you please provide your example strategy?

mrmiyagi

Here is an example:

java.util.List<IChartObject> objects = chart.getAll();
Iterator it = objects.iterator();
while (it.hasNext()) {
IChartObject obj = (IChartObject) it.next();
if (obj.getType().equals(IChart.Type.SHORT_LINE)) {
...
}
}

It works and finds the shortline objects.

API Support

To get the price property, you need to cast the object to the corresponding interface:

((IShortLineChartObject)obj).getPrice(0);

Another option is just to call the toString method, which will print both coordinates, i.e.:

console.getOut().println(obj.toString());

or simply:

console.getOut().println(obj);

mrmiyagi

The getPrice(0) gives the price at the start of the short_line, the getPrice(1) gives the price at the end of the short_line.
I would like to get the price between. (Calculating the ascend/descend ratio of the line doesn't work, because on backtest, the BT draw sometimes flat bars during the weekend). Is there any function to get the price properly? Or how I could get the bars drawn into the chart to decide if there's any flat bar in it?

The main problem is when the BT get to the weekend, the end of the line's time is a weekend time, but as the first tick comes sunday night, the end of the line's time changes.

What I exactly want to do is to check whether the current price crosses the short_line.

API Support

Consider modifying the following example such that instead of passing the shift, you pass the price and find the shift instead of the price:
https://www.dukascopy.com/wiki/#Ray_line_prices_by_shift

mrmiyagi

Thank you, but this is not that, what I asked.

In the chart I can't see the weekends in the past, but I can see those intervals in the future.

The getBar() returns with the weekend's flat bars too so your barInterval result is bad.

Finally as I wrote "Calculating the ascend/descend ratio of the line doesn't work, because on backtest, the BT draw sometimes flat bars during the weekend".
Please tell me a more precise method, to calculate the shortline's price.

Thank you

API Support

mrmiyagi wrote:
In the chart I can't see the weekends in the past, but I can see those intervals in the future.
This depends on platform settings. The filters on chart can be changed in JForex client settings: Tools > Preferences > Chart > Flats Filtration.
mrmiyagi wrote:
The getBar() returns with the weekend's flat bars too so your barInterval result is bad.
That is why there is follow-up example which shows how to deal with filters.
mrmiyagi wrote:
Finally as I wrote "Calculating the ascend/descend ratio of the line doesn't work, because on backtest, the BT draw sometimes flat bars during the weekend".
See 1.
mrmiyagi wrote:
Please tell me a more precise method, to calculate the shortline's price.
See 2.