[cocos2d]子龍山人的塔防例子有問

Cocos2d-x
#1

子龍山人的塔防例子有問

原網頁:http://www.cnblogs.com/zilongshanren/archive/2011/07/10/2102401.html

問一下:
DataModel类的作用是甚麼?
另外:
我跟他的教學做有些問題:
-(void)addWaypoint {
DataModel *m = ;
CCTMXObjectGroup *objects = ;
WayPoint *wp = nil;

int wayPointCounter =0;
NSMutableDictionary *wayPoint;
while ((wayPoint = ])) {
int x = intValue];
int y = intValue];

wp = ;
wp.position = ccp(x, y);
;
wayPointCounter++;
}
NSAssert( >0, @"Waypoint objects missing");
wp = nil;
}

wp是甚麼?