Drawing in UIView stops working if view width becomes greater than about 16600

I am using following code to plot graph in a view (in the drawRect method):

CGContextBeginPath(context);
CGContextMoveToPoint(context, devicePoint.x, devicePoint.y);

for (index = 1; index < dataCount; index++) {
    devicePoint = [[deviceDataArray objectAtIndex:index] CGPointValue];
    CGContextAddLineToPoint(context, devicePoint.x, devicePoint.y);
}

CGContextSetLineJoin(context, kCGLineJoinRound);
CGContextStrokePath(context);

It works if the view.bounds.size.width is less than about 16600. Bu开发者_开发知识库t above that size the plot stops appearing.

I resize the view depending on the range of the data to be plotted.

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This is very bad idea to make such huge width for view, you must draw only what user can see in one time (or a little more) and use view of normal (screen) size for this. For controlling where user currently is use UIScrollView.

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You are probably better off using CAShapeLayers to do the drawing, as they have no actual pixels, just a path that the hardware draws. Then you could have a UIScrollView which just exposed parts of the CAShapeLayers for drawing, otherwise you are making a huge image with the view as large as you have it currently.