How to set bounds on a plotspace in CorePlot? - ios

Question

I am trying to draw multiple scatter plots on the same graph using Core-Plot. They have the same x-axis (time), but I want them to be drawn independently of each other. For eg, for two plots, I want the screen to be divided into two parts, the upper part showing one plot and the lower part showing the other (I intend to ultimately plot a real-time multi-channel input). Something like this:
I tried modifying the tutorial given in the following link to use two plotspaces instead of one:
http://www.raywenderlich.com/13271/how-to-draw-graphs-with-core-plot-part-2
However, there is no function to set the bounds of a plotspace. The functions xRange and yRange change the range of the axes, but both the plotspaces still occupy the whole screen.
Following is a code snippet that shows two ways in which I tried to accomplish setting bounds:
-(void)configurePlots {
//Get graph and plot space
CPTGraph *graph = self.hostView.hostedGraph;
CPTXYPlotSpace *aaplPlotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
//**Setting xRange and yRange doesn't work**
aaplPlotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromCGFloat(0.0)
length:CPTDecimalFromCGFloat(graph.bounds.size.width)];
aaplPlotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromCGFloat(0.0)
length:CPTDecimalFromCGFloat((graph.bounds.size.height)/3)];
CPTXYPlotSpace *googPlotSpace = [[CPTXYPlotSpace alloc] init];
googPlotSpace.xRange = aaplPlotSpace.xRange;
googPlotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromCGFloat((graph.bounds.size.height)/3)
length:CPTDecimalFromCGFloat((graph.bounds.size.height)/3)];
[graph addPlotSpace:googPlotSpace];
//Create Plots
//**Trying to set bounds using initWithFrame doesn't work either**
CGRect rect = CGRectMake(0.0, 0.0, graph.bounds.size.width, graph.bounds.size.height/2);
CPTScatterPlot *aaplPlot = [[CPTScatterPlot alloc] initWithFrame:rect];
aaplPlot.dataSource = self;
aaplPlot.identifier = CPDTickerSymbolAAPL;
CPTColor *aaplColor = [CPTColor redColor];
[graph addPlot:aaplPlot toPlotSpace:aaplPlotSpace];
rect = CGRectMake(0.0, graph.bounds.size.height/2, graph.bounds.size.width, graph.bounds.size.height/2);
CPTScatterPlot *googPlot = [[CPTScatterPlot alloc] initWithFrame:rect];
googPlot.dataSource = self;
googPlot.identifier = CPDTickerSymbolGOOG;
CPTColor *googColor = [CPTColor greenColor];
[graph addPlot:googPlot toPlotSpace:googPlotSpace];
//[graph addPlot:googPlot];
//Set up Plot space
[aaplPlotSpace scaleToFitPlots:[NSArray arrayWithObject:aaplPlot]];
CPTMutablePlotRange *xaRange = [aaplPlotSpace.xRange mutableCopy];
[xaRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
aaplPlotSpace.xRange = xaRange;
CPTMutablePlotRange *yaRange = [aaplPlotSpace.yRange mutableCopy];
[yaRange expandRangeByFactor:CPTDecimalFromCGFloat(1.2f)];
aaplPlotSpace.yRange = yaRange;
//Create styles and symbols
CPTMutableLineStyle *aaplLineStyle = [aaplPlot.dataLineStyle mutableCopy];
aaplLineStyle.lineWidth = 2.5;
aaplLineStyle.lineColor = aaplColor;
aaplPlot.dataLineStyle = aaplLineStyle;
CPTMutableLineStyle *aaplSymbolLineStyle = [CPTMutableLineStyle lineStyle];
aaplSymbolLineStyle.lineColor = aaplColor;
CPTPlotSymbol *aaplSymbol = [CPTPlotSymbol ellipsePlotSymbol];
aaplSymbol.fill = [CPTFill fillWithColor:aaplColor];
aaplSymbol.lineStyle = aaplSymbolLineStyle;
aaplSymbol.size = CGSizeMake(6.0f, 6.0f);
aaplPlot.plotSymbol = aaplSymbol;
CPTMutableLineStyle *googLineStyle = [googPlot.dataLineStyle mutableCopy];
googLineStyle.lineWidth = 1.0;
googLineStyle.lineColor = googColor;
googPlot.dataLineStyle = googLineStyle;
CPTMutableLineStyle *googSymbolLineStyle = [CPTMutableLineStyle lineStyle];
googSymbolLineStyle.lineColor = googColor;
CPTPlotSymbol *googSymbol = [CPTPlotSymbol starPlotSymbol];
googSymbol.fill = [CPTFill fillWithColor:googColor];
googSymbol.lineStyle = googSymbolLineStyle;
googSymbol.size = CGSizeMake(6.0f, 6.0f);
googPlot.plotSymbol = googSymbol;
}
My question is, is my current approach correct in trying to set bounds on plotspaces or do I need to draw different graphs on the same screen and set the bounds on the graphs? And how do I set bounds on plotspaces or graphs (whichever is the right way!)?
Thanks!