Curves in UIScrollView and zoom : how to keep the width ?

Dear all,
I have a very simple issue. I successfully implemented a UIScrollView with a Bezier Curve, and the zoom is also working fine. (I'm also using a CATiledLayer to improve the final render. But it's optional for this issue...)
The point is the following : if I zoom in, the width of the curve will be increased (original width * Zoom). So, to keep a good width at the screen, I reduce dynamically the width (CGContextSetLineWidth(context, 1.0/scale)).
This methods works but... I have the deep feeling that it's not the best solution. Because if I zoom in a lot (like 10x), the curbe became darker (because the width becomes 1/10...)
So, is it possible to keep the width of the Curve of 1px without modifying the width manually ? (like in the bloomberg application, for instance...)
Thanks a lot for your tips !

Since I see that nobody really seems understanding... my question can be summarized by this :
Is it possible to define a curve width zoom independent ?

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Curves in UIScrollView and zoom : how to keep the width ?

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