Question

In numberOfRecordsForPlot:... I have this code:

int count = [[optsDict objectForKey:@"Values"] count];
NSLog(@"pie count: %i", count);
return count;

It outputs pie count: 4 thus (unless I’m misinterpreting) there should be 4 segments to the pie chart.

Then in numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index I have this:

double percentage = ((float)counter/(float)total)*100;
num = (NSDecimalNumber *)[NSDecimalNumber numberWithInt:(int)percentage];

NSLog(@"index: %i, percentage: %f", index, percentage);
NSLog(@"%@", num);

return num;

This outputs:

index: 0, percentage: 9.090909
9
index: 1, percentage: 9.090909
9
index: 2, percentage: 63.636364
63
index: 3, percentage: 18.181818
18

So I am assuming (reasonably) that the function is getting run once for each segment and its returning a figure for all of them!

However the chart looks like this:

Theres not really much else I can tell you. Thats all I know, I don’t know much about core plot!

If there is ANY help you can give me I’d be very appreciative!

Thank you

Answer 1

I play with your values and I think I found the problem in your code.

Try to return in -(NSNumber *)numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index object of class NSNumber

num = (NSNumber *)[NSNumber numberWithInt:(int)percentage];
return num;

I was testing this in sample that is included in CorePlot framework. Firstly I tried to init contentArray array with NSNumbers:

NSMutableArray *contentArray = [NSMutableArray arrayWithObjects:[NSNumber numberWithInt:9.0909099], [NSNumber numberWithInt:9.0909099], [NSNumber numberWithInt:63.63636463], [NSNumber numberWithInt:18.181818], nil];

And everything works perfect. Then I’ve tried to init array as in your code with NSDecimalNumbers:

NSMutableArray *contentArray = [NSMutableArray arrayWithObjects:[NSDecimalNumber numberWithInt:9.0909099], [NSDecimalNumber numberWithInt:9.0909099], [NSDecimalNumber numberWithInt:63.63636463], [NSDecimalNumber numberWithInt:18.181818], nil];

And I’ve received exactly your double colored chart.

Hope this will help you =)