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POCorePlot: Automatic labeling policy for Date
 

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    <p>I am using CorePlot for an iPhone app. My x-axis consists of dates. I set my refDate like this:</p> <pre><code>NSDateComponents *dateComponents = [[NSDateComponents alloc]init]; [dateComponents setHour:12]; [dateComponents setMinute:0]; [dateComponents setSecond:0]; NSCalendar *gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSGregorianCalendar]; NSDate *refDate = [gregorian dateFromComponents:dateComponents]; NSDateFormatter *dateFormater = [[NSDateFormatter alloc]init]; [dateFormater setDateFormat:@"HH:mm"]; CPTTimeFormatter *timeFormater = [[CPTTimeFormatter alloc]initWithDateFormatter:dateFormater]; timeFormater.referenceDate = refDate; </code></pre> <p>and I set the x-axis like this:</p> <pre><code>CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet; CPTXYAxis *x = axisSet.xAxis; x.majorGridLineStyle = majorXGridLineStyle; x.majorIntervalLength = CPTDecimalFromFloat(oneHour * 4); x.minorTicksPerInterval = 3; x.labelFormatter = timeFormater; </code></pre> <p>When I don't use the automatic labeling policy the graph looks like this: <img src="https://i.stack.imgur.com/FWzDx.png" alt="enter image description here"></p> <p>Which is fine, but when I zoom in I'd love to have the automatic labeling feature. So when I enable it:</p> <pre><code>x.labelingPolicy = CPTAxisLabelingPolicyAutomatic; </code></pre> <p>I get these results:</p> <p><img src="https://i.stack.imgur.com/9txmS.png" alt="enter image description here"></p> <p>Is there a way to combine my values with the ones form the automatic labeling policy?</p>
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    1. USalecnash
    1. USalecnash
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      1. VTUpMod
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      1. VTUpMod
    1. COtake a look at the CPTAxisDelegate methods, you can get notifications when the graph has been resized and reapply your custom labels at the new scale.
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      1. USandrew lattis
    2. COThanks, I'll check
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      1. USalecnash
 

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