Stroke with a constant width (using AffineTransform)

Question

I need to have a java.awt.Stroke that has a line width (and preferably using BasicStroke, a dash array) which is independant of the current scale of the Graphics2D object i'm drawing to.
I.e. a scaling of 1000 in x and a stroke of width 2 drawn as 2 pixels on the screen. If i change the scale (using an AffineTransform) to 400 in x then i still want the line drawn to be 2 pixels wide on the screen.
I know i can give the stroke a width of 1 but i'd like to be able to change the width to other amounts.
One option would be to set the current transform on the Graphics2D object back to normal but when drawing the line i need (well, would prefer,) to still be able to specify the points in the correct scale.
I figured i need to subclass BasicStroke and overide the createStrokedShape() method but i don't really know what to overide it with.
I make the affineTransform object so i can easily pass it in as a parameter somewhere.
help apreciated.
Andy.

Answer 1

This may not help you, but I avoid changing the scale of the AffineTransform associated with the Graphics object passed to paint* methods. It screws up strokes, as you mentioned, and it also dooesn't interact well with fonts (use the Font methods named deriveFont to rescale fonts). And a recent poster was writing about hot it screwed up his texturePaint, too. How could you adjust scale?
1. For shapes, I use AffineTransform's createTransformedShape to scale the shape itself.
2. For images, you can use class AffineTransformOp, or rescaling versions of Graphics' drawImage methods, or Graphics2D's drawRenderedImage (it takes a xform).
3. For simple rescaling, I just do it programmatically -- on my fingers and toes, so to speak...
In conclusion, you may not have to rescale in the way you are currently doing it...