objective c - Box2D dynamic body falling off screen -


i have rectangular object (like spear) , have ground body. problem is, when spear hits ground, doesn't bounce back, falls though , off screen. here physics setup: (ignore ball reference, suppose called spear (rectangular))

-(id) init {      if( (self=[super init])) {          cgsize winsize = [ccdirector shareddirector].winsize;          self.isaccelerometerenabled = yes;         self.istouchenabled = yes;          // create sprite , add layer         _ball = [ccsprite spritewithfile:@"spear.png" rect:cgrectmake(0, 0, 100, 10)];         _ball.position = ccp(100, 100);         [self addchild:_ball];          // create world         b2vec2 gravity = b2vec2(0.0f, -20.0f);         bool dosleep = true;         _world = new b2world(gravity, dosleep);          // create edges around entire screen         b2bodydef groundbodydef;         groundbodydef.position.set(0,0);         b2body *groundbody = _world->createbody(&groundbodydef);         b2polygonshape groundbox;         b2fixturedef boxshapedef;         boxshapedef.shape = &groundbox;         groundbox.setasedge(b2vec2(0,0), b2vec2(winsize.width/ptm_ratio, 0));         groundbody->createfixture(&boxshapedef);         groundbox.setasedge(b2vec2(0,0), b2vec2(0, winsize.height/ptm_ratio));         groundbody->createfixture(&boxshapedef);         groundbox.setasedge(b2vec2(0, winsize.height/ptm_ratio), b2vec2(winsize.width/ptm_ratio, winsize.height/ptm_ratio));         groundbody->createfixture(&boxshapedef);         groundbox.setasedge(b2vec2(winsize.width/ptm_ratio, winsize.height/ptm_ratio), b2vec2(winsize.width/ptm_ratio, 0));         groundbody->createfixture(&boxshapedef);          // create ball body , shape         b2bodydef ballbodydef;         ballbodydef.type = b2_dynamicbody;         ballbodydef.position.set(100/ptm_ratio, 100/ptm_ratio);         ballbodydef.userdata = _ball;         b2body *_body = _world->createbody(&ballbodydef);           b2polygonshape spearshape;         spearshape.setasbox(100/ptm_ratio, 10/ptm_ratio);         b2fixturedef ballshapedef;         ballshapedef.shape = &spearshape;           ballshapedef.density = 1.0f;         ballshapedef.friction = 0.9f;         ballshapedef.restitution = 0.89f;          b2vec2 force;         force.set(_body->getlinearvelocity().x+5.0f, _body->getlinearvelocity().y+10.0f);         _body->setlinearvelocity(force);          [self schedule:@selector(tick:)];     }     return self; }  - (void)tick:(cctime) dt {      _world->step(dt, 10, 10);     for(b2body *b = _world->getbodylist(); b; b=b->getnext()) {             if (b->getuserdata() != null) {             ccsprite *balldata = (ccsprite *)b->getuserdata();             balldata.position = ccp(b->getposition().x * ptm_ratio,                                     b->getposition().y * ptm_ratio);             balldata.rotation = -1 * cc_radians_to_degrees(b->getangle());         }             } }

i don't see anywhere in code attaching shapes ball , spear. if body not have shape - not collide.


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