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Intelligent Point Inserting / Deleting Options · View
thedigitalsean
#1 Posted : Wednesday, August 03, 2011 10:35:48 PM
Rank: Newbie

Groups: Registered

Joined: 11/2/2010
Posts: 5
I have an application that allows for the user to insert a point into a line. For this, I use
Code:
mSeries.getPoints().addXY(x,y)

on my series. This works fine, but later on my application needs to go through the data in order along the X-axis to process it. The only way I know to do this is with a for loop through the indexes I get with
Code:
mSeries.getPoints().get(index)


Unfortunately, it looks like addXY() adds new points at the last index instead of inserting it and then updating the indexes. Is there a way to do this automatically, or is this something I will need to manually in my code?

Also, my application will allow for deleting points, do the indexes get updated in this case?

Thanks,
Sean
Baydalka Volodymyr
#2 Posted : Thursday, August 04, 2011 12:39:13 PM
Rank: Developers Team


Groups: Registered, Administrators

Joined: 7/28/2009
Posts: 447
Hi,

X value is not the index of point. There may be several points with the same X value. If you need to find point by X value, there is best-performance way -

Code:
int index = Collections.binarySearch(series.getPointsCache(), new Double(xValue), new Comparator()
{
    public int compare(Object arg0, Object arg1)
    {
        double d1 = arg0 instanceof Double ? ((Double)arg0).doubleValue() : ((ChartPoint)arg0).getX();
        double d2 = arg1 instanceof Double ? ((Double)arg1).doubleValue() : ((ChartPoint)arg1).getX();

        return Double.compare(d1, d2);
    }            
});


Best regards,
Volodymyr Baydalka
Andriod development and support team
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