StackOverflow2013

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PO
primarykey
Id
20480870
data
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AnswerCount
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ClosedDate
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2013-12-09T21:11:12.313
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2013-12-11T00:23:04.657
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2017-05-23T12:21:43.363
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Body
This took me days to sort out, and I don't think I could have ever figured it out without SO. Thanks especially to @Awais Tariq for giving me the clue needed here: <a href="https://stackoverflow.com/questions/7524843/get-canvas-coordinates-after-scaling-up-down-or-dragging-in-android">Get Canvas coordinates after scaling up/down or dragging in android</a>. Basically everything (movements, translations, and most importantly, checking against pointer positions) must run through a calculation that can translate the new screen density. Here's what I changed in case anyone in future runs into this mess: <pre><code>liveRect.left = (startPos.x / scaleFactor + clipbounds.left) - width/2; liveRect.top = (startPos.y / scaleFactor + clipbounds.top )- height/2; liveRect.right = liveRect.left + width; liveRect.bottom = liveRect.top + height; </code></pre> This recalcs the postions of the rects after a zoom. But the pointer is also 'off' exponentially as you go further from 0,0. To correct, I used the following formula inside the if-check to see what was touched: <pre><code>if (r.contains(startPos.x / scaleFactor + clipbounds.left, startPos.y / scaleFactor + clipbounds.top)) </code></pre> Everything is successfully working with this solution. I may go back and try this with a layout instead to see if passing in a view to the if-check might be easier. But, for now, this works. Way too complex for my newbie coder brain to figure this out, I wonder if this isn't something that could be built in to Android in future.
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1. POAndroid - How to find a Rect after a zoom
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1. PTAnswer
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1. USCommunity
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1. USWatercayman
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1. POAndroid - How to find a Rect after a zoom
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