android - Bitmap.getPixel crashes program -


i working on bitmap collisions in android studio (detecting when 2 images collide, not 2 rects) , wrote following method. first part of code-all of if statements- determine position of 2 intersecting rectangles , create rectangle made of overlap between intersecting rectangles. second part of code tries iterate through each pixel in newly created rectangle , determine whether transparent or not. however, in order this, use pic1.getpixel (pic1 , pic2 2 bitmaps valid images in them) program crashes every time try use getpixel. checked make sure first part of code works correctly , does. why happening?

 public boolean iscollision(rect r1, rect r2 ) {     if(r1.intersect(r2))     {         rect r3 = new rect(0,0,0,0);         if (r2.left < r1.right && r2.top < r1.bottom && r2.right > r1.right && r2.bottom > r1.bottom)         {             r3.set(r2.left, r2.top, r1.right, r1.bottom);         }         else if (r2.right > r1.left && r2.top < r1.bottom && r2.left < r1.left && r2.bottom > r1.bottom)         {             r3.set(r1.left, r2.top, r2.right, r1.bottom);         }         else if (r2.left < r1.right && r2.bottom > r1.top)         {             r3.set(r2.left, r1.top, r1.right, r2.bottom);         }         else if(r2.right > r1.left && r2.bottom > r1.top)         {             r3.set(r1.left, r1.top, r2.right, r2.bottom);         }         log.v("debugging", "made part overlapping rectangle creation");         (int = r3.left; i<r3.right; i++)         {             (int j = r3.top; j < r3.bottom; j++)             {                  /*log.v("debugging","pixel 1: " + integer.tostring(pic1.getpixel(i,j)));                 log.v("debugging","pixel 2: " + integer.tostring(pic2.getpixel(i,j)));                 log.v("debugging","transparent color: " + integer.tostring(color.transparent));*/                 if (pic1.getpixel(i,j) != color.transparent)                 {                     if (pic2.getpixel(i,j) != color.transparent)                     {                         return true;                     }                 }             }         }         log.v("debugging", "made past pixel search");     }     return false;  }

i figured out, turns out x , y values, using position of pixel based on coordinate system of screen. however, getpixel, 0,0 point in upper right hand corner of image trying pixels for. therefore,the problem solved when did getpixel(i-rect.left,j-rect.top)


Comments

Post a Comment

Popular posts from this blog

toolbar - How to add link to user registration inside toobar in admin joomla 3 custom component -

im trying write component admin side , need add user creation. dont want duplicate existing codes add link. know how add task not simple link toolbar. thx help. if wanting button opens new user screen can try in component: $bar = jtoolbar::getinstance('toolbar'); $bar->appendbutton('link', 'users', 'new user','index.php?option=com_users&task=user.add'); you need add view.html.php file wherever you're creating toolbar. is need?
Read more

linux - disk space limitation when creating war file -

i have 1 gb disk space limitation hosting app , have used 700mb of it. however want create war file directory big (around 600mb) using command : jar -cvf root.war folderpath that's why encounter quota limitation , can't following. i'm looking way delete folder content when it's applying archive conserve disk space take note can't install zip tool in ssh shell ~ the code works on test directories, test first anyway, deletes files. it's not efficient. assumptions: 300mb free space, in destructively compress 600mb folderpath directory. none of files big -- if file in folderpath 300mb or larger, fail. notes: if ' $out ' file exists, nothing. first find pipes file list while , if ' $out ' doesn't exist in loop, create it, don't update -- if does exist, update it. each pass adds 1 more file, deletes unless file directory. after loop finishes delete empty directories too. unset u ; in=folderpath ; out=roo...
Read more

How to provide Authorization & Authentication using Asp.net, C#? -

Image
i have asp.net application in c#. i have provide page authorization specific user/usergroup. i have created 2 tables in database: 1) pagename 2)permissions[insert, update, view, delete] but i'm unable match tables , permissions assigning... can 1 please me, how created tables in database , how coding. please me. you can below explanation. configure access specific file , folder, set forms-based authentication. request page in application redirected logon.aspx automatically. in web.config file, type or paste following code. this code grants users access default1.aspx page , subdir1 folder . <configuration> <system.web> <authentication mode="forms" > <forms loginurl="login.aspx" name=".aspnetauth" protection="none" path="/" timeout="20" > </forms> </authentication> <!-- section denies access files in...
Read more