I don't think it's worth attempting. I *think* that gradients are
cached in some way so trying to recalculate the gradient to span the
update rect correctly is: a) going to need a fair bit of work to
calculate and b) not allow caching to work efficiently. In any case,
pixels that are clipped out shouldn't be being drawn anyway, so the
performance gain is likely to be miniscule.
G.
On 11 Jun 2008, at 7:22 am, Michael Watson wrote:
This is normally what I have to do as well, but is there a more
optimized way to achieve the goal of drawing only the rect that
needs redrawing?
--
m-s
On 10 Jun, 2008, at 12:05, Ken Ferry wrote:
You're probably filling your gradient into the rect passed in
drawRect.
That rectangle just represents the dirty part of your view. If you
had a solid color to draw, you could just fill the rect, but with a
gradient you will get your gradient, top to bottom, within this
possibly small rect within your view.
Try drawing the gradient into [self bounds] instead. This
describes the location of the entire view in its own coordinate
system.
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