iter.nextIdx_ = i;
iter.next();
nextCanvasY = iter.hasNext ? iter.peek.canvasy : null;
var isNextCanvasYNullOrNaN = nextCanvasY === null ||
nextCanvasY != nextCanvasY;
iter.nextIdx_ = i;
iter.next();
nextCanvasY = iter.hasNext ? iter.peek.canvasy : null;
var isNextCanvasYNullOrNaN = nextCanvasY === null ||
nextCanvasY != nextCanvasY;