piching and zoom

Discussion in 'iOS Programming' started by bkphat, Oct 2, 2008.

  1. bkphat macrumors newbie

    Joined:
    Jun 8, 2008
    #1
    Sorry in advance to bother you all with this question, but I have exhausted by resources.

    Let's say I wanted to pinch an image in a view and scale it dynamically as the fingers are moving. Eg like the google maps app or the photo app.

    Before I proceed, is there any sample code on such a thing out there?

    Anyway, this is what I have so far that doesn't work:

    I have a method converts the distance between two fingers into a euclidean distance.

    As the fingers move, I take a ratio of the new distance between fingers and old distance between fingers. I then transform the picture with this ratio using one of the MakeScale functions.

    Somehow this looks really bad when executed.

    I realized that the maps/photo app must do something differently. Maybe it tracks each finger separately?

    Any help would be appreciated.

    thanks much
     
  2. Taum macrumors member

    Joined:
    Jul 28, 2008

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