Core-plot real-time-data for redraw plot

StackOverflow https://stackoverflow.com/questions/16758992

  •  30-05-2022
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Question

I have 4 hosting view on 1 self.view

self.hostView.frame = CGRectMake(0.0, 0.0, 512.0, 352.0);
self.hostView2.frame = CGRectMake(512.0, 0.0, 512.0, 352.0);
self.hostView3.frame = CGRectMake(0.0, 352.0, 512.0, 352.0);
self.hostView4.frame = CGRectMake(512.0, 352.0, 512.0, 352.0);

On hostingView i make plot. i have 4 arrays with some data.

self.arr1 = [NSMutableArray arrayWithObjects:
                [NSDecimalNumber numberWithFloat:36.23],
                [NSDecimalNumber numberWithFloat:38.44],
                nil];
self.arr2 = [NSMutableArray arrayWithObjects:
                [NSDecimalNumber numberWithFloat:36.23],
                [NSDecimalNumber numberWithFloat:38.44],
                nil];
self.arr3 = [NSMutableArray arrayWithObjects:
                [NSDecimalNumber numberWithFloat:36.23],
                [NSDecimalNumber numberWithFloat:38.44],
                nil];
self.arr4 = [NSMutableArray arrayWithObjects:
                [NSDecimalNumber numberWithFloat:36.23],
                [NSDecimalNumber numberWithFloat:38.44],
                nil];

I use timer that call method generator

[NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(generator) userInfo:nil repeats:YES];

-(void)generator
{
    [self.bd1 removeObjectAtIndex:0];
    NSInteger count=arc4random()%30;
    [self.bd1 addObject:[NSNumber numberWithInteger:(20+count)]];
    [graph reloadData];

    [self.bd2 removeObjectAtIndex:0];

    [self.bd2 addObject:[NSNumber numberWithInteger:(20+count)]];
    [graph2 reloadData];

    [self.bd3 removeObjectAtIndex:0];

    [self.bd3 addObject:[NSNumber numberWithInteger:(20+count)]];
    [graph3 reloadData];

    [self.bd4 removeObjectAtIndex:0];

    [self.bd4 addObject:[NSNumber numberWithInteger:(20+count)]];
    [graph4 reloadData];
}

It's work 38 seconds and than freezes. What i can do for make it working fine. I need to reload data for making real-time

Any ideas?

Was it helpful?

Solution

See the "Real Time Plot" demo in the Plot Gallery example app for one approach. Instead of loading all of the plot data and labels on every update, tell the plots to update only the points that change. Use -insertDataAtIndex:numberOfRecords: to insert the new data points and -deleteDataInIndexRange: to remove any old data that you no longer need.

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