On Mar 16, 2006, at 8:43 AM, Joseph J. Strout wrote:
I've done this via method b), and it's really not that much of a
pain. One
session of sitting down with the rotate tool in Photoshop and
automating the
export process, and you're done.
I've done it with POV-Ray (a freeware ray tracer) -- the advantage
there is that you can have a shaded/shadowed control knob, and the
shadows don't rotate along with the knob. Makes for a very
convincing UI.
GarageBand has a knob similar to this... so I looked into the
resources to see how it was created. It turns out that there are
three (four if you count the indicator mask) separate images:
dial01-face.tiff
dial02-line.tiff
dial03-line-glow.tiff
dial04-body.tiff
The knob is assembled first with the "dial04-body.tiff" on the
bottom. Then the "dial03-line-glow.tiff" and "dial02-line.tiff" are
rotated and combined on top of the body -- Cocoa has very nice
picture rotate functions. Finally the "dial01-face.tiff" tops it all
off.
So basically you could do the same as GarageBand if you are able to
rotate the line; or you could draw the line with the Graphics object
and a thicker pen weight.
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