java - Collision detection between circles -


i got working class creates darkhole object in screen. filled circle random color, position , radius. when screen touched, supposed draw ball avoiding other ones have been drawn.

i used method: colision radius

public class darkhole extends view {      public static final int maxdiameter = 250;      public static final int mindiameter = 240;      /**     * class log tag.     */     private static final string log_tag = darkhole.class.getsimplename();      private static list<shapedrawable> mholes;      private int mwindowwidth;      private int mwindowheight;      private random random;      /**     * constructor;     *     * @param context application context.     */     public darkhole(context context) {         super(context);         mholes = new arraylist<shapedrawable>();         random = new random();          //get screen size         point point = new point();         windowmanager windowmanager = (windowmanager) context.getsystemservice(context.window_service);         display display = windowmanager.getdefaultdisplay();         display.getsize(point);          // screen max x , y.         mwindowwidth = point.x;         mwindowheight = point.y;     }      /**     * draw random hole.     */     private void generaterandomhole() {         while(true) {             shapedrawable hole = new shapedrawable(new ovalshape());              // generate random color.              int r = random.nextint(255);             int g = random.nextint(255);             int b = random.nextint(255);             int randomcolor = color.rgb(r, g, b);              // generate random position.             int diameter = random.nextint(maxdiameter - mindiameter + 1) + mindiameter;             int x = random.nextint((mwindowwidth - diameter) + 1);             int y = random.nextint((mwindowheight - diameter) + 1);              hole.getpaint().setcolor(randomcolor);             hole.setbounds(x, y, x + diameter, y + diameter);              if (checkdrawcontains(hole)) {                 log.d(log_tag, "[generaterandomhole] contains!");                 hole = null;                 random = null;             } else {                 log.d(log_tag, "[generaterandomhole] not contains!");                 mholes.add(hole);                 break;             }         }     }      /**     * draw informative text.     *     * @param canvas canvas object.     */     private void generatetext(canvas canvas) {         paint color = new paint();         color.setcolor(color.black);         color.settextsize(70);         color.setantialias(true);         color.setdither(true);         canvas.drawtext("bolas: " + mholes.size(), 10, 50, color);     }       private boolean checkdrawcontains(shapedrawable newhole) {         long newcenterx = newhole.getbounds().left + (newhole.getbounds().width()/2);         long newcentery = newhole.getbounds().top + (newhole.getbounds().height()/2);          log.d(log_tag, "[checkdrawcontains] newcenterx: " + newcenterx);         for(shapedrawable hole: mholes) {             long centerx = hole.getbounds().left + (hole.getbounds().width()/2);             long centery = hole.getbounds().top + (hole.getbounds().height()/2);             long x = centerx - newcenterx;             long y = centery - newcentery;             long aux = (long) ((math.pow(math.abs(x),2)) + (math.pow(math.abs(y),2)));             long distance = (long) math.sqrt(aux);             log.d(log_tag, "[checkdrawcontains] x: " + x);             log.d(log_tag, "[checkdrawcontains] y: " + y);             log.d(log_tag, "[checkdrawcontains] distance: " + distance);             log.d(log_tag, "[checkdrawcontains] sum radius: " + (newcenterx + centerx));             long srads = (newhole.getbounds().width()/2) + (hole.getbounds().width()/2);              if(distance <=  srads ) {                 return true;             }         }         return false;     }      /** {@inheritdoc} */     protected void ondraw(canvas canvas) {         super.ondraw(canvas);          generatetext(canvas);         (shapedrawable hole : mholes) {             hole.draw(canvas);         }          invalidate();     }      /** {@inheritdoc} */     @override     public boolean ontouchevent(motionevent event) {         switch (event.getaction()) {         case motionevent.action_down:             generaterandomhole();             return true;         }         return super.ontouchevent(event);     } }

it should work, crashes when recursion starts recalculate random parameters. stack overflow? why happening? how should solved?


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