Jim Graham wrote:
> > how about using translate on top of the scale transform
> > is there any difference on using scale on top of the translate
> > transform?
>
> All transforms are last-invoked-first-applied. For example:
>
> setToTranslate(tx, ty)
> scale(sx, sy)
>
> Tx(x, y) == [sx * x + tx, sy * y + ty]
>
> In this case, the translation is unaffected by the scale. Coordinates
> in user space are first scaled by sx,sy and then translated by tx,ty.
>
> setToScale(sx, sy)
> translate(tx, ty)
>
> Tx(x, y) == [(x + tx) * sx, (y + ty) * sy]
>
> In this case, the translation is scaled by the scale since it is applied
> before the scale. Coordinates in user space are first translated and
> then the translated coordinates are scaled.
>
> Finally, going back to the previous point:
>
> setToScale(sx, sy)
> setToTranslate(tx, ty)
>
> Tx(x, y) == [x + tx, y + ty]
>
> The scale here was erased by the translate since the "setTo" form
> of the method was used...
>
> Does that answer your questions?
>
> ...jim
YES! and once again thank you very much. :-)
--
Charlemagne L. Rey
Software Design Engineering
NEC Technologies Philippines, Inc.
--do unto others as you would have them do unto you--
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