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自動的にスクロールするプロットをプログラムしたいので、実際の時間は右側にあります。（赤でマーク）

ここに画像の説明を入力してください

データは時間間隔で不規則に追加されます。どうすればこれを達成できますか？私はすでにスクロールグラフを持っています（coreplotによって提供されたサンプルコードに基づいています）。しかし、それは完全に正確ではなく、CPUをかなり消費します。また、ラベルは14:52:0014:52:20などの「ラウンド」時間である必要があります。

これはこれまでの私のコードです：

TestWindowController.h

@interface TestWindowController : NSWindowController<CPTPlotDataSource> {
    NSMutableArray *plotData;
    double currentIndex;
    NSDate *referenceDate;
    NSTimer *scrollTimer;
    NSTimer *newDataTimer;
}
@property (weak) IBOutlet CPTGraphHostingView *graphView;

TestWindowController.m

NSString *kPlotIdentifier       = @"Data Source Plot";
const double kTimePeriod = 60.0; // 1 Minute
const double kFrameRate         = 10.0;  // frames per second
const double kAlpha             = 0.25; // smoothing constant

@interface DataObj : NSObject {
    NSTimeInterval timeInterval;
    double testValue;
}
@property(readwrite) NSTimeInterval timeInterval;
@property(readwrite) double testValue;
@end

@implementation DataObj
@synthesize timeInterval;
@synthesize testValue;
@end


@implementation TestWindowController
@synthesize graphView;

- (id)initWithWindow:(NSWindow *)window
{
    self = [super initWithWindow:window];
    if (self) {
        // Initialization code here.
    }

    return self;
}

- (void)windowDidLoad
{
    // Set a reference Date
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSDateComponents *dateComponents = [gregorian components:(NSHourCalendarUnit | NSMinuteCalendarUnit)
                                                    fromDate:[NSDate date]];
    [dateComponents setSecond:0];
    referenceDate = [gregorian dateFromComponents:dateComponents];
    currentIndex = 0.0;

    // Core Plot
    CPTGraph *graph = [[CPTXYGraph alloc] initWithFrame:CGRectZero];
    graphView.hostedGraph = graph;
    [graph applyTheme:[CPTTheme themeNamed:kCPTPlainBlackTheme]];

    //[self setTitleDefaultsForGraph:graph withBounds:bounds];
    //[self setPaddingDefaultsForGraph:graph withBounds:bounds];

    graph.plotAreaFrame.paddingTop    = 15.0;
    graph.plotAreaFrame.paddingRight  = 15.0;
    graph.plotAreaFrame.paddingBottom = 70.0;
    graph.plotAreaFrame.paddingLeft   = 55.0;

    // Grid line styles
    CPTMutableLineStyle *majorGridLineStyle = [CPTMutableLineStyle lineStyle];
    majorGridLineStyle.lineWidth = 0.75;
    majorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.5];

    CPTMutableLineStyle *minorGridLineStyle = [CPTMutableLineStyle lineStyle];
    minorGridLineStyle.lineWidth = 0.25;
    minorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.1];

    // Axes
    // X axis
    CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
    CPTXYAxis *x          = axisSet.xAxis;
    x.labelingPolicy              = CPTAxisLabelingPolicyAutomatic;
    x.orthogonalCoordinateDecimal = CPTDecimalFromUnsignedInteger(0);
    x.majorGridLineStyle          = majorGridLineStyle;
    x.minorGridLineStyle          = minorGridLineStyle;
    x.minorTicksPerInterval       = 9;
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    dateFormatter.dateStyle = kCFDateFormatterNoStyle;
    dateFormatter.timeStyle = kCFDateFormatterMediumStyle;
    CPTTimeFormatter *timeFormatter = [[CPTTimeFormatter alloc] initWithDateFormatter:dateFormatter];
    timeFormatter.referenceDate = referenceDate;
    x.labelFormatter            = timeFormatter;

    // Y axis
    CPTXYAxis *y = axisSet.yAxis;
    y.labelingPolicy              = CPTAxisLabelingPolicyAutomatic;
    y.orthogonalCoordinateDecimal = CPTDecimalFromUnsignedInteger(0);
    y.majorGridLineStyle          = majorGridLineStyle;
    y.minorGridLineStyle          = minorGridLineStyle;
    y.minorTicksPerInterval       = 3;
    y.labelOffset                 = 5.0;
    y.axisConstraints             = [CPTConstraints constraintWithLowerOffset:0.0];

    // Rotate the labels by 45 degrees, just to show it can be done.
    x.labelRotation = M_PI * 0.25;

    // Create the plot
    CPTScatterPlot *dataSourceLinePlot = [[CPTScatterPlot alloc] init] ;
    dataSourceLinePlot.identifier     = kPlotIdentifier;
    dataSourceLinePlot.cachePrecision = CPTPlotCachePrecisionDouble;

    CPTMutableLineStyle *lineStyle = [dataSourceLinePlot.dataLineStyle mutableCopy];
    lineStyle.lineWidth              = 3.0;
    lineStyle.lineColor              = [CPTColor greenColor];
    dataSourceLinePlot.dataLineStyle = lineStyle;

    dataSourceLinePlot.dataSource = self;
    [graph addPlot:dataSourceLinePlot];

    // Plot space
    CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
    plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(0) length:CPTDecimalFromDouble(kTimePeriod)];
    plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(0) length:CPTDecimalFromUnsignedInteger(1)];

    plotData  = [[NSMutableArray alloc] init];
    scrollTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 / kFrameRate
                                         target:self
                                       selector:@selector(scrollPlot:)
                                       userInfo:nil
                                        repeats:YES];
    newDataTimer = [NSTimer scheduledTimerWithTimeInterval:3.0
                                                   target:self
                                                 selector:@selector(newData:)
                                                 userInfo:nil
                                                  repeats:YES];
}

#pragma mark Test Methods

-(void)scrollPlot:(NSTimer *)theTimer
{
    CPTGraph *theGraph = graphView.hostedGraph;
    CPTPlot *thePlot   = [theGraph plotWithIdentifier:kPlotIdentifier];

    if ( thePlot ) {
        currentIndex = (-[referenceDate timeIntervalSinceNow])-kTimePeriod;
        CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)theGraph.defaultPlotSpace;
        double location       = currentIndex;
        plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromDouble(location)
                                                        length:CPTDecimalFromDouble(kTimePeriod)];

        //[plotData addObject:[NSNumber numberWithDouble:(1.0 - kAlpha) * [[plotData lastObject] doubleValue] + kAlpha * rand() / (double)RAND_MAX]];
        //[thePlot insertDataAtIndex:plotData.count - 1 numberOfRecords:1];
    }
}

-(void)newData:(NSTimer *)theTimer
{
    CPTGraph *theGraph = graphView.hostedGraph;
    CPTPlot *thePlot   = [theGraph plotWithIdentifier:kPlotIdentifier];

    if ( thePlot ) {
        DataObj *test = [[DataObj alloc] init];
        test.timeInterval = -[referenceDate timeIntervalSinceNow];
        test.testValue = rand() / (double)RAND_MAX;

        [plotData addObject:test];
        [thePlot insertDataAtIndex:plotData.count - 1 numberOfRecords:1];
    }
}

#pragma mark Plot Data Source Methods

-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
    return [plotData count];
}

-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
    NSNumber *num = nil;
    DataObj *dataObj = [plotData objectAtIndex:index];
    switch ( fieldEnum ) {
        case CPTScatterPlotFieldX:
            num = [NSNumber numberWithDouble:dataObj.timeInterval];
            break;

        case CPTScatterPlotFieldY:
            num = [NSNumber numberWithDouble:dataObj.testValue];
            break;

        default:
            break;
    }

    return num;
}

プログラムを時間精度が高く、CPUの消費量を減らすにはどうすればよいですか？ありがとう。

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1 に答える 1

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自動軸ラベル付けポリシーは、日付ではうまく機能しません。たとえば、20 秒ごとにラベル付けする場合は、固定間隔のラベル付けポリシーを使用します。

CPU 使用率が高いのは、おそらく、プロット範囲が更新されるたびに軸とプロットを再描画することに関連しています。CPU 使用率とスムーズな更新の最適な組み合わせを見つけるには、さまざまなスクロール フレーム レートを試してみる必要があります。

于 2013-01-05T00:07:03.917 に答える