Hi,

I tried to add an indicator to the chart. This works for the native method ... getIndicator("COG").
But this doesn't work for setting an Object[] with defined values (timePeriod, smoothPeriod).

Please provide an code-sample to set paramater of an indicator in strategy code.

Where is the best place to add the indicator? Currently I add it in onStart() -method.

Thx
DT

In every case of adding I'm getting a ClassCastException:

java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to [D
   at com.dukascopy.indicators.CenterOfGravityIndicator.setInputParameter(CenterOfGravityIndicator.java:134)
   at de.STRG.onStart(HB_CenterOfGravity.java:155)
   at com.dukascopy.api.impl.execution.s.call(Unknown Source)
   at com.dukascopy.api.impl.connect.ai.a(Unknown Source)
   at com.dukascopy.api.impl.connect.v.call(Unknown Source)
   at com.dukascopy.api.impl.connect.v.call(Unknown Source)
   at com.dukascopy.api.impl.execution.i.call(Unknown Source)
   at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
   at java.util.concurrent.FutureTask.run(Unknown Source)
   at com.dukascopy.api.impl.execution.e$a.f(Unknown Source)
   at com.dukascopy.api.impl.execution.e$a.run(Unknown Source)
   at java.lang.Thread.run(Unknown Source)

I tried the following:

chart.addIndicator(this.context.getIndicators().getIndicator("COG"), new Object[] {AppliedPrice.CLOSE, timePeriod, smoothPeriod, maType});

and as alternative this piece of code, with same exception:

IIndicator indCOG = this.context.getIndicators().getIndicator("COG");
IIndicatorInfo indCOGInfo = indCOG.getIndicatorInfo();
       
log("Indicator.getTitle(): " +indCOGInfo.getTitle());
log("Indicator.getNumberOfInputs(): " +indCOGInfo.getNumberOfInputs());
log("Indicator.getNumberOfOptionalInputs(): " +indCOGInfo.getNumberOfOptionalInputs());
log("Indicator.getNumberOfOutputs(): " +indCOGInfo.getNumberOfOutputs());
log("Indicator.toString(): " +indCOGInfo.toString());
       
for (int i=0; i<indCOGInfo.getNumberOfInputs(); i++) {
  log("Indicator.getInputParameterInfo(" +i+ ").getName(): " +indCOG.getInputParameterInfo(i).getName());
}
       
for (int i=0; i<indCOGInfo.getNumberOfOptionalInputs(); i++) {
  log("Indicator.getOptInputParameterInfo(" +i+ ").getName(): " +indCOG.getOptInputParameterInfo(i).getName());
}
       
for (int i=0; i<indCOGInfo.getNumberOfOutputs(); i++) {
  log("Indicator.getOutputParameterInfo(" +i+ ").getName(): " +indCOG.getOutputParameterInfo(i).getName());
}
    
// after log-output this should run the code and add the indicator   
indCOG.setInputParameter(0, new Object[]{AppliedPrice.CLOSE});
indCOG.setOptInputParameter(0, new Object[]{timePeriod});
indCOG.setOptInputParameter(1, new Object[]{smoothPeriod});
indCOG.setOptInputParameter(2, new Object[]{maType});

chart.addIndicator(indCOG); 

Without any parameter the indicator was added successful.
Why?

Hi,
java.lang.ClassCastException: can occurs if you pass incorrect parameter type to the indicator, for example your parameter is double, but indicator expect int.

Thank you for your very little input ....

What parameter is double? I tried several variants, all my own parameters (timePeriod, smoothPeriod)
are ints.

//indCOG.setInputParameter(0, AppliedPrice.CLOSE);
indCOG.setOptInputParameter(0, timePeriod);
indCOG.setOptInputParameter(1, smoothPeriod);
indCOG.setOptInputParameter(2, maType);

chart.addIndicator(indCOG); 

So, AppliedPrice.CLOSE should be a Double? But this is a standard param?
If I commented this out, the exception occurs at last lin and says that maType is
not a Double but it is initialized as:

@Configurable("MAType")
public IIndicators.MaType maType = IIndicators.MaType.SMMA;

f I delete this last line and only apply "timePeriod" and "smoothPeriod" which are
definitely INTs and annotated with @Configurable the values are not applied to chart.
The default values for COG are applied to chart ....

Please provide a little bit more help on this topic ... it should be a core function
and doesn't seem to work.

My other question was, which method/place in strategy is the right one for adding a chart?

Thx
DT

Hi,
Please try the following:

IIndicator ind = this.context.getIndicators().getIndicator("COG");
chart.addIndicator(ind, new Object[]{6, 11, MaType.EMA.ordinal()});

Ok, thanks. But I think there are still some bugs in the adding of indicators:

Your recommandation is working, but I'm not able to set the AppliedPrice with this way.

chart.addIndicator(indCOG, new Object[]{timePeriod, smoothPeriod, maType.ordinal()});

This works, but the colors of the lines are black. I have to edit the parameter of the indicator, then the colors
will be applied.

chart.addIndicator(indCOG, new Object[]{timePeriod, smoothPeriod, maType.ordinal(), AppliedPrice.CLOSE});

This compiles and run the code, but in the left upper corner of the indicator window no values are shown.

indCOG.setInputParameter(0, AppliedPrice.CLOSE);
indCOG.setOptInputParameter(0, timePeriod);
indCOG.setOptInputParameter(1, smoothPeriod);
indCOG.setOptInputParameter(2, maType.ordinal());
chart.addIndicator(indCOG);

This does compile only. Default values for indicator are taken for chart drawing.
Is this method supported for setting the indicator values?

My conclusion so far: Setting indicators out of onStart-Method of an strategy doesn't work.
So we have to put indicators manually on the chart.

Are there any other experiences?

Thx
DT

Hi,
Use the following code to specify the applied price, drawing style, colors, etc for the indicator:

for (int i = 0; i < indCOG.getIndicatorInfo().getNumberOfInputs(); i++) {
  InputParameterInfo inputParameterInfo = indCOG.getInputParameterInfo(i);
  inputParameterInfo.setAppliedPrice(AppliedPrice.LOW);
}                                                   
            
  chart.addIndicator(indCOG, new Object[]{5, 6, MaType.SMA.ordinal()}, new Color[]{Color.RED, Color.GREEN}, 
    new DrawingStyle[]{DrawingStyle.DASHDOT_LINE, DrawingStyle.LINE}, new int[]{1, 2});