Cocos2d - only one scheduler called - opengl-es

Question

I'm trying to trace 2 paths on screen through a series of vertices (connect the dots style). Each should be a different color, and each has its own list of vertices.
I started out by creating a class which can trace a path, then creating 2 instances of this class, one for each path. I overrode the draw method. It worked just fine except for some reason only the first instance of the class called the draw method. I figured it was a problem with OpenGL so I did it again using CCDrawNode and it still had the same bug.
Only one instance (blackPath) draws any objects on screen. In fact the scheduled updateEndpoint: method is not even called for the whitePath object, although it is successfully created.
My Drawer.m Class:
const float size = 10;
const float speed = 5;
ccColor4F pathColor;
int numPoints;
NSArray * path;
CGPoint endPoint;
#implementation Drawer
-(id)initWithPath:(NSArray*)p andColorIsBlack:(BOOL)isBlack{
self = [super init];
// Record input
path = p.copy;
pathColor = ccc4f(1.0f, 1.0f, 1.0f, 1.0f);
if(isBlack){
pathColor = ccc4f(0.0f, 0.0f, 0.0f, 1.0f);
}
// Set variables
numPoints = 1;
endPoint = [[path firstObject] position];
NSLog(#"Drawer initialized with path of length %u and color %hhd (isblack)", p.count, isBlack);
[self schedule:#selector(updateEndpoint:)];
return self;
}
-(void)updateEndpoint:(ccTime)dt{
NSLog(#"(%f, %f, %f, %f) Path", pathColor.r, pathColor.g, pathColor.b, pathColor.a);
[self drawDot:endPoint radius:size color:pathColor];
CGPoint dest = [[path objectAtIndex:numPoints] position];
float dx = dest.x - endPoint.x;
float dy = dest.y - endPoint.y;
// new coords are current + distance * sign of distance
float newX = endPoint.x + MIN(speed, fabsf(dx)) * ((dx>0) - (dx<0));
float newY = endPoint.y + MIN(speed, fabsf(dy)) * ((dy>0) - (dy<0));
endPoint = ccp(newX, newY);
if(endPoint.x == dest.x && endPoint.y == dest.y){
if(numPoints < path.count-1){
numPoints+=1;
}
else{
[self unschedule:#selector(updateEndpoint:)];
}
}
}
And here is where I instantiate the objects:
-(id) init{
self = [super init];
[self addAllCards];
[self addScore];
xShrinkRate = [[Grid getInstance] sqWidth] / shrinkTime;
yShrinkRate = [[Grid getInstance] sqHeight] / shrinkTime;
dropList = [NSMutableArray new];
notDropList = [NSMutableArray new];
[self schedule:#selector(dropCard:) interval:0.075];
[self schedule:#selector(shrinkCards:)];
Drawer * whitePath = [[Drawer alloc] initWithPath:[[Score getInstance] whitePath] andColorIsBlack:false];
[self addChild:whitePath];
Drawer * blackPath = [[Drawer alloc] initWithPath:[[Score getInstance] blackPath] andColorIsBlack:true];
[self addChild:blackPath];
return self;
}

Answer 1

Change the (non-const) global variables to instance variables of the class like so:
#implementation Drawer
{
ccColor4F pathColor;
int numPoints;
NSArray * path;
CGPoint endPoint;
}