CODEWITHSUNDEEP
iphoneobjective-cxcode4core-plot
Ranga
Ranga

Reputation: 821

How to write date time values in core plot graph in iphone

I have implemented core plot graph using link http://www.johnwordsworth.com/2011/10/adding-charts-to-your-iphone-ipad-app-using-core-plot/

In this example author used both float values for x,y points

but now i need to use time values for y axis points how should i wrote code to assign x,y points

AppDelegate *app =  (AppDelegate*)[[UIApplication sharedApplication] delegate];
NSMutableArray * times = app.timesArray;
NSMutableArray * painlevels = app.PainlevelsArray;
[super viewWillAppear:animated];
//Xand y Points to draw a graph
 NSMutableArray *data = [NSMutableArray array];
for(int i=0 ; i< [painlevels count]; i++)
{
    [data addObject:[NSValue valueWithCGPoint:CGPointMake([[painlevels objectAtIndex:i]floatValue] , [[times objectAtIndex:i]floatValue])]];
}

//X,y points for previous values float values in author example

/* [data addObject:[NSValue valueWithCGPoint:CGPointMake(@"fd", 0)]]; [data addObject:[NSValue valueWithCGPoint:CGPointMake(-8, 10)]]; [data addObject:[NSValue valueWithCGPoint:CGPointMake(-6, 40)]]; [data addObject:[NSValue valueWithCGPoint:CGPointMake(-5, 20)]]; [data addObject:[NSValue valueWithCGPoint:CGPointMake(0, 50)]]; [data addObject:[NSValue valueWithCGPoint:CGPointMake(3, 3)]]; [data addObject:[NSValue valueWithCGPoint:CGPointMake(4, 18)]]; [data addObject:[NSValue valueWithCGPoint:CGPointMake(6, 36)]]; [data addObject:[NSValue valueWithCGPoint:CGPointMake(9, 66)]];*/

self.scatterPlot = [[ScatterPlot alloc] initWithHostingView:_graphHostingView andData:data];
[self.scatterPlot initialisePlot];

Upvotes: 1

Views: 1121

Answers (1)

Eric Skroch
Eric Skroch

Reputation: 27381

Core Plot includes two different ways to format date values. CPTTimeFormatter formats dates based on a time interval given in seconds relative to a reference date. CPTCalendarFormatter lets you specify the interval (days, months, hours, etc.).

The DatePlot and Plot Gallery example apps demonstrate how to use CPTTimeFormatter. See this discussion thread for an example of how to use CPTCalendarFormatter.

CPTCalendarFormatter is really great but it is not available in version 1.0. You can add it to your project from the link referenced above.

Upvotes: 2

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