How to scale the scrollpane's Vvalue

Hey

It is my first time using javaFX 2 and I am having problems with the scrollPane's Vvalue.
I am trying to keep track of the top left hand corner of the viewport because I want to render objects as I move around and I need to know the co-ordinates around the viewport.

The current compensation I am trying to use it:

Code :

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double tempX = ((scroll.hvalueProperty().get()) * CANVASSIZE) - ((scroll.hvalueProperty().get()) * scrollPaneWidth);
double tempY = ((scroll.vvalueProperty().get()) * CANVASSIZE) - ((scroll.vvalueProperty().get()) * (scrollPaneHeight));

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But this attempt is not 100% correct.
After this works I also scaling the scrollPane's content, so I also want to scale the x and y co-oordinates with the scale.

Does anyone have some insight in the problem?

Thanks.
Jacques

I found a solution:

Code :

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  tempY = (scroll.vvalueProperty().get())  * (CANVASSIZE- scrollPaneHeight/tempScale);

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I was just trying to make a pannable scrollPane and I had the scrollBars visible so that I could see where I was, but that messed up the calculations. When I set the scrollbar's visibility off, the code worked.