GWT + ScatterChart: How to show a regression line

[Mario Rossi]

I am sorry I post here, but I cannot post into the GWT group

The question is: Using GWT is there an example of showing the regression line into a ScatterChart ?

P.S. Yes, I know I have to calculate the line points, the question is just how to actually show the line

Thanks, Damiano

[Sergey Grabkovsky]

Hello,

GViz currently has no capabilities to calculate and display regression lines. However, if you have already calculated the points and put them in a DataTable, you may either use the lineWidth option to connect all the points in all your series or use the options.series[seriesIndex].lineWidth option to control the line width of each individual series (you can even set the options.series[seriesIndex].pointSize option to get rid of the points themselves). Hope this answers your question!

- Sergey

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[Mario Rossi]

Thanks Sergey

The question is really how you do what you say using GWT.

I will try to actually find out by digging up in the code, if needed, but if there is an answer somewhere then I would prefer that :)

Thanks for you help !

Damiano

[Sergey Grabkovsky]

It seems that this option is not currently exposed via GWT as a Java option, but you can still use this options via the JavaScript Native Interface. We're currently working to expose more options via GWT so that you don't have to do this, but meanwhile you may use the following method to set the option:

public final native void setSeriesLineWidth(Options options, int seriesIndex, double lineWidth) /*-{

  options.series[seriesIndex] = {

    lineWidth: lineWidth

  };

}-*/;

I haven't tested this code myself, so I hope it works for you!

- Sergey

Damiano

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[Mario Rossi]

Dear Sergey

I did some digging up and found this

 public final native void setSeries(int index, Series seriesAtIndex) /*-{
      if (!this.series) {
        this.series = {};
      }
      this.series[index] = seriesAtIndex;
    }-*/;

It is from 

http://code.google.com/p/gwt-google-apis/source/search?q=com.google.gwt.visualization.client.visualizations.corechart.ComboChart.Options&origq=com.google.gwt.visualization.client.visualizations.corechart.ComboChart.Options&btnG=Search+Trunk

I also found an implementation of Series

I will be experimenting with it