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cocosboy
Member
Hi, I am removing my enemy body like this
cpSpaceRemoveBody(MySpace, EnemyBody);but I am getting this error
Aborting due to Chipmunk error: This addition/removal cannot be done safely during a call to cpSpaceStep(). Put these calls into a Post Step Callback.
Failed condition: !space->locked
Source:/gnc/Projects/Cocos2d/MyProject/libs/Chipmunk/src/cpSpace.c:415
any suggestions?
I am unable to debug and I could not find any thing thing about this error on forum.
thanks in advance
Steve Oldmeadow
Administrator
Chipmunk questions must be placed in the physics forum. I have moved the post.
Steve Oldmeadow
Administrator
The link is at the bottom of the front page, 3 down from the forum you posted in. "physics"
When do you call this function, my guess is during some collision; if so that error is telling you that you should be calling something like this instead:
cpSpacePostStepRemoveAndFreeShapeAndBody(space, shape);Notice I'm removing body AND shape because that's probably what you're intending.
Mark Sawicki
Member
Hi,
It's recommended to remove during a post step callback, as the error mentions. Have a look in /external/Chipmunk/Demo/Sensors.c, specifically the cpSpaceAddPostStepCallback call in the collision callback catcherBarBegin .
HTH,
-Mark
cocosboy
Member
I am doing some thing like this.
// these are my collision functions.
static void CollisionPowerUpRemove(cpSpace *space, cpShape *shape, void *MyBGPowerup)
{
CCSprite *MyBG = (CCSprite *)MyBGPowerup;
CCSprite *tempSprite = (CCSprite *) shape->data;
[MyBG removeChild:tempSprite cleanup:YES];
cpSpaceRemoveBody(space, shape->body);
cpBodyFree(shape->body);
cpSpaceRemoveShape(space, shape);
cpShapeFree(shape);
// here I remove a power from NSMutableArray
for(int u=0; u<[PowerUPs count]; u++)
{
PowerUp *tempPU = (PowerUp *)[PowerUPs objectAtIndex:u];
if(shape->body == tempPU.PowerUpBody)
{
[tempPU RemoveMe];
[PowerUPs removeObject:tempPU];
u = [PowerUPs count];
}
}
}
static int EnemyCollision(cpArbiter *arb, cpSpace *space, void *GamePlayClass)
{
gamePlay *ClassObj = (gamePlay *) GamePlayClass; //this is my game play class
cpShape *a, *b;
cpArbiterGetShapes(arb, &a, &b);
cpSpaceAddPostStepCallback(space, (cpPostStepFunc)CollisionPowerUpRemove, b, ClassObj.bg );
a->body->v = cpvzero; // it stops my player
[ClassObj DeleteARandomEnemy];
return 1;
}when I call this [ClassObj DeleteARandomEnemy]; using this i have to delete one of the enemy in it I do like this. Here the function "DeleteARandomEnemy" is in my game play class. Here I select a random enemy and call the delete function of enemy class.
-(void) DeleteARandomEnemy
{
int EnemyCount = [Enemies count];
EnemyCount -= 1;
int IndexToRemove = (arc4random() % EnemyCount)+0;
Enemy *ObjEnemyRemove = (Enemy *)[Enemies objectAtIndex:IndexToRemove];
[ObjEnemyRemove DeleteMe:bg MySpace:space]; // here bg is background of game play
[Enemies removeObject:ObjEnemyRemove];
}the Delete Me function in Enemy class is
-(void) DeleteMe:(CCSprite *)bg MySpace:(cpSpace *)MySpace
{
CCSprite *tempSprite = (CCSprite *) self.EnemyShape->data;
[bg removeChild:tempSprite cleanup:YES];
cpSpaceRemoveBody(MySpace, self.EnemyBody);
cpBodyFree(self.EnemyBody);
cpSpaceRemoveShape(MySpace, self.EnemyShape);
cpShapeFree(self.EnemyShape);
}@mobilebros I have tried to use
cpSpacePostStepRemoveAndFreeShapeAndBody(space, shape);but it gives error.
@Mark I am already using cpSpaceAddPostStepCallback. it removes the body of collision fine. the problem is only when I delete a random displayed Enemy from the game play.
if some is unable to understand yet. i can explain more.
thanks for reply guys
Mark Sawicki
Member
@cocosboy,
@mobilebros is way more qualified to answer your questions, but it seems to me that you should have another post step callback to remove the enemy, the same as you are doing with the powerup. As it looks right now, you are removing an enemy during the collision callback, which can cause problems.
-Mark
cocosboy
Member
sorry for late
after spending 2 days for this problem i just stopped it and started developing other application.
today I resolved this problem
@Mark thanks for your suggestion, it worked
I did all my logic of powerup (as i have a couple of powerups to implement) in collision function i.e CollisionPowerUpRemove
and called a function to remove my enemy like this
cpSpaceAddPostStepCallback(space, (cpPostStepFunc)RemoveEnemy, EnemyShape, ClassObj.bg );and my RemoveEnemy function is
static void EnemyRemove(cpSpace *space, cpShape *shape, void *bg)
{
CCSprite *MyBG = (CCSprite *)bg;
CCSprite *tempSprite = (CCSprite *) shape->data;
[MyBG removeChild:tempSprite cleanup:YES];
CGPoint AnimPoint;
AnimPoint.x = shape->body->p.x;
AnimPoint.y = shape->body->p.y;
cpSpaceRemoveBody(space, shape->body);
cpBodyFree(shape->body);
cpSpaceRemoveShape(space, shape);
cpShapeFree(shape);
// add explosion animation
ExpObj = [[Explosion alloc] initWithImage:@"explosion00"];
[ExpObj DisplayExplosion:AnimPoint BackGround:MyBG];
[ExpObj release];
}just wanted to share with all guys
thanks to all who helped me
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