[android-developers] Re: Programming a target in an Android Application
Thought I would post back and say thanks for helping me program the target. It was very straightforward in the end. And if someone else 'Googles' it in the future this is bound to come up! Identify the centre point, then use the X and Y coordinates of it as a correction factor Use Pythagoras theorem to calculate the hypotenuse of the triangle i.e. the longest side of an imaginary triangle that exists based on the coordinates recorded when somebody touches the screen. Award different points or do different things based on this length. Cheers guys On Aug 3, 9:47 pm, kingh32 horaceb1...@gmail.com wrote: Thanks, both of you for your help. I imagine I'll be back with more questions soon! On Aug 3, 8:08 pm, Bob Kerns r...@acm.org wrote: Everything -- both the positions and the image widget size -- will be in pixel coordinates. Actually, you don't need to know that -- just that they're the same. Hell, I could even be wrong; I'm not going to take out a microscope and check. If you have different coordinates for your image data (or even if you don't or don't know or might want to scale in the future or are paranoid), simply scale by the ratio of the image data : image widget. A scale factor of 1:1 won't cause you any trouble. There are times to be absolute, and times to be relative. This is one of the latter. On Aug 3, 9:25 am, kingh32 horaceb1...@gmail.com wrote: Hello - Thanks for your reply! What you have just mentioned is pretty much where I'm stuck! I don't know how to identify programatically where the target actually is. Would this be done using pixel coordinates? Is there a way to determine the resolution of the phone (screen) that the app is being run on and adjust these calculations accordingly? Thanks On Aug 3, 4:52 pm, TreKing treking...@gmail.com wrote: On Tue, Aug 3, 2010 at 4:05 AM, Horace Bell-Gam horaceb1...@gmail.comwrote: No, so far all I've been able to do is overlay an image of the target and make the entire object respond to a click. You know: - The center of the image - The length of each band - Where the user clicks on the image (via onTouchEvents, me thinks) - Simple algebra to calculate the distance of a point from the center of the image (I hope) That's all you should need to figure out which band the user has touched. What have you tried thus far? Where are you stuck? --- -- TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Programming a target in an Android Application
Hello - Thanks for your reply! What you have just mentioned is pretty much where I'm stuck! I don't know how to identify programatically where the target actually is. Would this be done using pixel coordinates? Is there a way to determine the resolution of the phone (screen) that the app is being run on and adjust these calculations accordingly? Thanks On Aug 3, 4:52 pm, TreKing treking...@gmail.com wrote: On Tue, Aug 3, 2010 at 4:05 AM, Horace Bell-Gam horaceb1...@gmail.comwrote: No, so far all I've been able to do is overlay an image of the target and make the entire object respond to a click. You know: - The center of the image - The length of each band - Where the user clicks on the image (via onTouchEvents, me thinks) - Simple algebra to calculate the distance of a point from the center of the image (I hope) That's all you should need to figure out which band the user has touched. What have you tried thus far? Where are you stuck? --- -- TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: Programming a target in an Android Application
On Tue, Aug 3, 2010 at 11:25 AM, kingh32 horaceb1...@gmail.com wrote: Would this be done using pixel coordinates? I guess. Is there a way to determine the resolution of the phone (screen) that the app is being run on and adjust these calculations accordingly? http://developer.android.com/reference/android/util/DisplayMetrics.html - TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
Re: [android-developers] Re: Programming a target in an Android Application
On Tue, Aug 3, 2010 at 11:25 AM, kingh32 horaceb1...@gmail.com wrote: Is there a way to determine the resolution of the phone (screen) that the app is being run on and adjust these calculations accordingly? Also, if I were you, I'd start by simply hard-coding a known size (like that of whatever device you have) and getting it to work first. Then, once that's done, do the second part of figuring out the actual width / height based on device properties. - TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Programming a target in an Android Application
Everything -- both the positions and the image widget size -- will be in pixel coordinates. Actually, you don't need to know that -- just that they're the same. Hell, I could even be wrong; I'm not going to take out a microscope and check. If you have different coordinates for your image data (or even if you don't or don't know or might want to scale in the future or are paranoid), simply scale by the ratio of the image data : image widget. A scale factor of 1:1 won't cause you any trouble. There are times to be absolute, and times to be relative. This is one of the latter. On Aug 3, 9:25 am, kingh32 horaceb1...@gmail.com wrote: Hello - Thanks for your reply! What you have just mentioned is pretty much where I'm stuck! I don't know how to identify programatically where the target actually is. Would this be done using pixel coordinates? Is there a way to determine the resolution of the phone (screen) that the app is being run on and adjust these calculations accordingly? Thanks On Aug 3, 4:52 pm, TreKing treking...@gmail.com wrote: On Tue, Aug 3, 2010 at 4:05 AM, Horace Bell-Gam horaceb1...@gmail.comwrote: No, so far all I've been able to do is overlay an image of the target and make the entire object respond to a click. You know: - The center of the image - The length of each band - Where the user clicks on the image (via onTouchEvents, me thinks) - Simple algebra to calculate the distance of a point from the center of the image (I hope) That's all you should need to figure out which band the user has touched. What have you tried thus far? Where are you stuck? --- -- TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
[android-developers] Re: Programming a target in an Android Application
Thanks, both of you for your help. I imagine I'll be back with more questions soon! On Aug 3, 8:08 pm, Bob Kerns r...@acm.org wrote: Everything -- both the positions and the image widget size -- will be in pixel coordinates. Actually, you don't need to know that -- just that they're the same. Hell, I could even be wrong; I'm not going to take out a microscope and check. If you have different coordinates for your image data (or even if you don't or don't know or might want to scale in the future or are paranoid), simply scale by the ratio of the image data : image widget. A scale factor of 1:1 won't cause you any trouble. There are times to be absolute, and times to be relative. This is one of the latter. On Aug 3, 9:25 am, kingh32 horaceb1...@gmail.com wrote: Hello - Thanks for your reply! What you have just mentioned is pretty much where I'm stuck! I don't know how to identify programatically where the target actually is. Would this be done using pixel coordinates? Is there a way to determine the resolution of the phone (screen) that the app is being run on and adjust these calculations accordingly? Thanks On Aug 3, 4:52 pm, TreKing treking...@gmail.com wrote: On Tue, Aug 3, 2010 at 4:05 AM, Horace Bell-Gam horaceb1...@gmail.comwrote: No, so far all I've been able to do is overlay an image of the target and make the entire object respond to a click. You know: - The center of the image - The length of each band - Where the user clicks on the image (via onTouchEvents, me thinks) - Simple algebra to calculate the distance of a point from the center of the image (I hope) That's all you should need to figure out which band the user has touched. What have you tried thus far? Where are you stuck? --- -- TreKing http://sites.google.com/site/rezmobileapps/treking - Chicago transit tracking app for Android-powered devices -- You received this message because you are subscribed to the Google Groups Android Developers group. To post to this group, send email to android-developers@googlegroups.com To unsubscribe from this group, send email to android-developers+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
