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Simple Divition/Multiplication help needed

Jimmy Nilsson

Joined: Sep 25, 2004
Posts: 26

I have Two JTextPanes that may contain diffrent amopunt of text. To this JTextPane i have JScroolPanes.

I Want the ScroolPanes to be syncroniced and when scroll1 is on location 75% then Scroll2 shold also be on the 75%.

I have problem with doing the math of this, the variabels dont simes to be abled to save fractions?


double tmpMScrool = scrollbar1.getVerticalScrollBar().getValue();
double tmpMScroolMax = scrollbar1.getVerticalScrollBar().getMaximum();

double ScrollCount = (double)tmpMScrool/(double)tmpMScroolMax;

ScrollCount = (double)scrollbar2.getVerticalScrollBar().getValue() * (double)ScrollCount;

//After this the ScrollCount is 0???


What is the problem here?

Best Regards
Peter Chase
Ranch Hand

Joined: Oct 30, 2001
Posts: 1970
I'm not totally sure, but I think that your problem may be that you are using getValue() on scrollbar2, rather than getMaximum().

You certainly don't need most of those casts to "double". They aren't doing anything.

Betty Rubble? Well, I would go with Betty... but I'd be thinking of Wilma.
Jimmy Nilsson

Joined: Sep 25, 2004
Posts: 26
Thanks, dident notice that with the maximum, ofcourse i shold use that one.

It is sorta covered in the JavaRanch Style Guide.
subject: Simple Divition/Multiplication help needed