Android :: How To Calculate Angle Between Line Defined By Two Points
Apr 20, 2010
I'm currently developing a simple 2D game for Android. I have a stationary object that's situated in the center of the screen and I'm trying to get that object to rotate and point to the area on the screen that the user touches. I have the constant coordinates that represent the center of the screen and I can get the coordinates of the point that the user taps on. I'm using the formula outlined in this forum: How to get angle between two points?
-It says as follows "If you want the the angle between the line defined by these two points and the horizontal axis:
double angle = atan2(y2 - y1, x2 - x1) * 180 / PI;".
-I implemented this, but I think the fact the I'm working in screen coordinates is causing a miscalculation, since the Y-coordinate is reversed. I'm not sure if this is the right way to go about it, any other thoughts or suggestions are appreciated.
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Apr 2, 2009
While doing debugging with Eclipse I noted that the debugger highlights the wrong line as "next line to execute" for methods with multiple return points. It fools the developer that the last line of the method is executed, where in fact it is not.Does anyone know if this is some kind of known issue? My colleagues have also experienced this but we have never seen it when doing on- device-debugging on e.g. the Sony Ericsson SDK.I couldn't find anything at http://code.google.com/p/android/issues/list There was a similar post in android-beginners 2007-11-25. No replies, though. http://groups.google.com/group/android-beginners/browse_thread/thread.
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Sep 8, 2010
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In app B, i tried to call the activity in A using below code.
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Jul 10, 2010
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Feb 4, 2010
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Oct 9, 2009
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Sep 10, 2010
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Oct 14, 2010
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I've tried keyword "angle" on
http://developer.android.com/reference/packages.html
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May 21, 2010
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Nov 11, 2010
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Jun 12, 2010
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Jun 14, 2010
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Aug 23, 2010
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Aug 20, 2010
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Jun 19, 2010
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Calculate with 4 easy steps the daily calories you need. The application is in English, Spanish, French and Italian.
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