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2013-11-11T12:29:24.170
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2013-11-11T15:13:30.067
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In case you are allowed to implement it dynamically here are some hints: <ol> <li>Create separate images(backgrounds) <ul> <li>1 image for the knob</li> <li>1 image for each small button</li> <li>1 image for the background</li> </ul></li> <li>Radius <ul> <li>measure the distance from the center of the background to the point where a small button should be placed (the radius of the background pattern) in pixels.</li> <li>you might need different sizes for different screens (different resolutions)</li> </ul></li> <li>Place the buttons: <ul> <li>place the background image and the knob <a href="http://developer.android.com/reference/android/widget/ImageButton.html" rel="nofollow">ImageButton</a> so that the center of the knob matches the center of the background - both images should be rectangular, so the central point should be at the crossing point of the diagonals</li> <li>use <a href="http://en.wikipedia.org/wiki/Spherical_coordinates" rel="nofollow">spherical coordinates</a> to <a href="http://en.wikipedia.org/wiki/Spherical_coordinates#Cartesian_coordinates" rel="nofollow">retrieve</a> the cartesian (x,y) coordinates of the small buttons - their centers should lie on those points</li> </ul></li> <li>Hit test <ul> <li>all your images should have transparent background</li> <li>you can implement the hit test to be successful only when the event is in the non-transparent part of the ImageButton background</li> </ul></li> <li>Rotation <ul> <li>To rotate the knob you can look for more info about rotating an ImageButton's background. I haven't tried something like this...</li> </ul></li> </ol>
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1. POLayout a knob and button view
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1. COI have a problem in placing buttons: their size is not same as their pixel size, they are much bigger!
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