willChangePlotRangeTo: makes no difference to graphs in Core Plot

i have the below code running in my app to stop the y-axis from being zoomed and scaled during touch or pinch gestures. I have axisConstraints assigned already, as are the globalXRange and Y.

-(CGPoint)plotSpace:(CPTPlotSpace *)space willChangePlotRangeTo:(CGPoint)displacement{ return CGPointMake(displacement.x,0); } -(CPTPlotRange *)plotSpace:(CPTPlotSpace *)space willChangePlotRangeTo:(CPTPlotRange *)newRange forCoordinate:(CPTCoordinate)coordinate{ if (coordinate == CPTCoordinateY) { newRange = ((CPTXYPlotSpace*)space).yRange; } NSLog(@"Plot changes %@", newRange); return newRange; }

My issue is that from the logs, 4-5 plot changes are recorded in the log while the page is first displaying when first running the app?? The code seems to work correctly, just i get no plots, plus no label + ticks on the Y.

2013-11-10 17:30:52.259 MyApp[8953:a0b] Pinch changes <<CPTPlotRange: 0x8d96680> {0, 30158.4}> 2013-11-10 17:30:52.260 MyApp[8953:a0b] Pinch changes <<CPTPlotRange: 0x8d94e70> {0, 40}> 2013-11-10 17:30:52.260 MyApp[8953:a0b] Pinch changes <<CPTPlotRange: 0x8d94330> {0, 34.44}> 2013-11-10 17:30:52.268 MyApp[8953:a0b] Pinch changes <<CPTPlotRange: 0x8da6da0> {0, 30158}> 2013-11-10 17:30:52.268 MyApp[8953:a0b] Pinch changes <<CPTPlotRange: 0x8da80e0> {0, 9}>


I did some mucking around with inserting NSLOG and the below code is what is creating the a gesture:

CPTXYPlotSpace *plotSpace2 = (CPTXYPlotSpace *) graph2.defaultPlotSpace; plotSpace2.allowsUserInteraction = YES; plotSpace2.delegate = self; plotSpace2.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0) length:CPTDecimalFromInteger([difference integerValue]*1.03)]; plotSpace2.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0) length:CPTDecimalFromFloat(9)]; plotSpace2.globalXRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0) length:CPTDecimalFromInteger([difference integerValue]*1.03)]; plotSpace2.globalYRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0) length:CPTDecimalFromFloat(9)];

so having plotspace.delegate=self was the cause, changed to x.delegate=self and that fixes the gesture issue i was seeing.

Unfortunately the code i have for zooming only the x makes no difference. :-/


Your delegate is preventing any changes to the yRange. Set the plot space delegate after you set up the initial yRange.

plotSpace2.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(0) length:CPTDecimalFromFloat(9)]; plotSpace2.delegate = self;

This behavior changed in release 1.4. In prior releases, -plotSpace:willChangePlotRangeTo:forCoordinate: was only called when pinch-scaling. Now, it is called any time the plot range changes.


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