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Re: Implementing Ken-burns Effect
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Re: Implementing Ken-burns Effect

  • Subject: Re: Implementing Ken-burns Effect
  • From: Jens Alfke <email@hidden>
  • Date: Thu, 18 Feb 2010 20:31:25 -0800
On Feb 16, 2010, at 11:18 PM, Kalyanraju M wrote:

> I am trying to implement Ken-burns effect for iPhone. Implemented Zoom-In And Zoom-Out. Got struck while implementing "Panning".
>
> Any ideas to implement "Panning".

Panning's just changing the x/y offset, while zooming changes the x/y scale. So figure out a position to start and end, and interpolate between them based on the time elapsed.

fract = (now - startTime) / totalTime
x = x0 + fract*(x1-x0)
y = y0 + fract*(y1-y0)
scale = scale0 + fract*(scale1-scale0)

then construct a transform based on x,y and scale, and set that.

—Jens_______________________________________________

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 >Implementing Ken-burns Effect (From: Kalyanraju M <email@hidden>)

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