update sprite position with schedule function - c++

Question

In my game I have an animated sprite. I added box2d to my game to add gravity. now I want to update my sprite's position using the schedule function. I got it working with objective-C, but I want it to be a multiplatform game so now I'm trying it in c++.
In my init I have the following line:
this->schedule(cocos2d::SEL_SCHEDULE(View::tick(1.0f)));
and the method tick:
void View::tick(float dt) {
world->Step(dt, 10, 10);
for(b2Body *b = world->GetBodyList(); b; b=b->GetNext()) {
if(b->GetUserData() != NULL) {
}
}
}
I get the following error on the line in my init: "cannot cast from type ' void' to member pointer type 'coco2d::sel_schedule' (aka void coco2d::CCobject::*)(float)
I have no idea what to do now. I tried to google, but everyone either uses objective - c or schedule_selector (which apparently doesn't work anymore)
Thanks in advance

Answer 1

You should probably not be using the schedule function to update a single sprite.
In your scene class, override the virtual method for update(...):
virtual void update(float dt)
{
CCLOG("This was called.");
// Do updates for everything in the scene you need to call on a tick.
}
Also, override onEnter() and onExitTransitionDidStart(). In the first, call scheduleUpdate to set up your scene for automatically being called on a tick. In the second, call unscheduledUpdate (as the scene is exiting) to stop the updates.
void IntroScene::onEnter()
{
CCScene::onEnter();
scheduleUpdate();
}
void IntroScene::onExitTransitionDidStart()
{
CCScene::onExitTransitionDidStart();
unscheduleUpdate();
}
Doing it this way gives you explicit control over what gets updated when...you only have a single function called during an update cycle.
HOWEVER, if you really want to do it:
Declare your custom updater like this:
void IntroScene::myUpdate(float dt)
{
CCLOG("Also called");
}
Schedule it like this:
schedule(schedule_selector(IntroScene::myUpdate), 1.0f);
Unschedule it like this:
unschedule(schedule_selector(IntroScene::myUpdate));
** NOTE ** As far as I know, you can only "schedule" objects derived from CCNode.
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