On Feb 6, 2010, at 11:28 AM, Paul Sanders wrote:
> Perhaps you could use separate images and convert them to
> monochrome, saving them as 1 bpp bitmaps (aka masks). Memory
> should not then be an issue.
>
> Paul Sanders.
>
> ----- Original Message -----
> From: "Andrew Farmer" <andf...@gmail.com>
> To: "Jens Alfke" <j...@mooseyard.com>
> Cc: <cocoa-dev@lists.apple.com>
> Sent: Saturday, February 06, 2010 7:19 PM
> Subject: Re: Touch: Non-rectangular Touch areas
>
>
> Another simple approach is to use an image to do hit testing.
> You can either create a bitmap image for each touchable area, or
> a single image with a different color for each target, then test
> the color at the target point to determine membership. My only
> concern with using this approach on iPhone might be the memory
> usage of that image.
You could consider representing each of your trapezoids (or, for
that matter, any arbitrary shape) via a CGPath object, and then use
CGPathContainsPoint
for your hit testing . . .
Cheers,
. . . . . . . . Henry
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