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Added a real-time plot sample to the Plot Gallery app.
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,17 @@ | ||
| // | ||
| // RealTimePlot.h | ||
| // CorePlotGallery | ||
| // | ||
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| #import "PlotItem.h" | ||
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| @interface RealTimePlot : PlotItem < CPTPlotDataSource > | ||
| { | ||
| NSMutableArray* plotData; | ||
| NSUInteger currentIndex; | ||
| NSTimer *dataTimer; | ||
| } | ||
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| -(void)newData:(NSTimer *)theTimer; | ||
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| @end |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,193 @@ | ||
| // | ||
| // RealTimePlot.m | ||
| // CorePlotGallery | ||
| // | ||
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| #import "RealTimePlot.h" | ||
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| const double kFrameRate = 5.0; // frames per second | ||
| const double kAlpha = 0.25; // smoothing constant | ||
| const NSUInteger kMaxDataPoints = 51; | ||
| NSString * kPlotIdentifier = @"Data Source Plot"; | ||
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| @implementation RealTimePlot | ||
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| + (void)load | ||
| { | ||
| [super registerPlotItem:self]; | ||
| } | ||
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| - (id)init | ||
| { | ||
| if ((self = [super init])) { | ||
| title = @"Real Time Plot"; | ||
| plotData = [[NSMutableArray alloc] initWithCapacity:kMaxDataPoints]; | ||
| dataTimer = nil; | ||
| } | ||
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| return self; | ||
| } | ||
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| - (void)killGraph | ||
| { | ||
| [dataTimer invalidate]; | ||
| [dataTimer release]; | ||
| dataTimer = nil; | ||
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| [super killGraph]; | ||
| } | ||
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| - (void)generateData | ||
| { | ||
| [plotData removeAllObjects]; | ||
| currentIndex = 0; | ||
| [dataTimer release]; | ||
| dataTimer = [[NSTimer timerWithTimeInterval:1.0 / kFrameRate | ||
| target:self | ||
| selector:@selector(newData:) | ||
| userInfo:nil | ||
| repeats:YES] retain]; | ||
| [[NSRunLoop mainRunLoop] addTimer:dataTimer forMode:NSDefaultRunLoopMode]; | ||
| } | ||
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| - (void)renderInLayer:(CPTGraphHostingView *)layerHostingView withTheme:(CPTTheme *)theme | ||
| { | ||
| #if TARGET_IPHONE_SIMULATOR || TARGET_OS_IPHONE | ||
| CGRect bounds = layerHostingView.bounds; | ||
| #else | ||
| CGRect bounds = NSRectToCGRect(layerHostingView.bounds); | ||
| #endif | ||
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| CPTGraph *graph = [[[CPTXYGraph alloc] initWithFrame:[layerHostingView bounds]] autorelease]; | ||
| [self addGraph:graph toHostingView:layerHostingView]; | ||
| [self applyTheme:theme toGraph:graph withDefault:[CPTTheme themeNamed:kCPTDarkGradientTheme]]; | ||
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| [self setTitleDefaultsForGraph:graph withBounds:bounds]; | ||
| [self setPaddingDefaultsForGraph:graph withBounds:bounds]; | ||
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| graph.plotAreaFrame.paddingTop = 15.0; | ||
| graph.plotAreaFrame.paddingRight = 15.0; | ||
| graph.plotAreaFrame.paddingBottom = 55.0; | ||
| graph.plotAreaFrame.paddingLeft = 55.0; | ||
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| // Grid line styles | ||
| CPTMutableLineStyle *majorGridLineStyle = [CPTMutableLineStyle lineStyle]; | ||
| majorGridLineStyle.lineWidth = 0.75; | ||
| majorGridLineStyle.lineColor = [[CPTColor colorWithGenericGray:0.2] colorWithAlphaComponent:0.75]; | ||
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| CPTMutableLineStyle *minorGridLineStyle = [CPTMutableLineStyle lineStyle]; | ||
| minorGridLineStyle.lineWidth = 0.25; | ||
| minorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.1]; | ||
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| // 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; | ||
| x.title = @"X Axis"; | ||
| x.titleOffset = 35.0; | ||
| NSNumberFormatter *labelFormatter = [[NSNumberFormatter alloc] init]; | ||
| labelFormatter.numberStyle = NSNumberFormatterNoStyle; | ||
| x.labelFormatter = labelFormatter; | ||
| [labelFormatter release]; | ||
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| // 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.title = @"Y Axis"; | ||
| y.titleOffset = 30.0; | ||
| y.isFloatingAxis = YES; | ||
| y.constraints = CPTMakeConstraints(CPTConstraintFixed, CPTConstraintNone); | ||
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| // Rotate the labels by 45 degrees, just to show it can be done. | ||
| x.labelRotation = M_PI * 0.25; | ||
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| // Create the plot | ||
| CPTScatterPlot *dataSourceLinePlot = [[[CPTScatterPlot alloc] init] autorelease]; | ||
| dataSourceLinePlot.identifier = kPlotIdentifier; | ||
| dataSourceLinePlot.cachePrecision = CPTPlotCachePrecisionDouble; | ||
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| CPTMutableLineStyle *lineStyle = [[dataSourceLinePlot.dataLineStyle mutableCopy] autorelease]; | ||
| lineStyle.lineWidth = 3.0; | ||
| lineStyle.lineColor = [CPTColor greenColor]; | ||
| dataSourceLinePlot.dataLineStyle = lineStyle; | ||
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| dataSourceLinePlot.dataSource = self; | ||
| [graph addPlot:dataSourceLinePlot]; | ||
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| // Plot space | ||
| CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace; | ||
| plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(0) length:CPTDecimalFromUnsignedInteger(kMaxDataPoints - 1)]; | ||
| plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(0) length:CPTDecimalFromUnsignedInteger(1)]; | ||
| } | ||
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| - (void)dealloc | ||
| { | ||
| [plotData release]; | ||
| [dataTimer invalidate]; | ||
| [dataTimer release]; | ||
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| [super dealloc]; | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Timer callback | ||
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| -(void)newData:(NSTimer *)theTimer | ||
| { | ||
| CPTGraph *theGraph = [graphs objectAtIndex:0]; | ||
| CPTPlot *thePlot = [theGraph plotWithIdentifier:kPlotIdentifier]; | ||
| if ( thePlot ) { | ||
| if ( plotData.count >= kMaxDataPoints ) { | ||
| [plotData removeObjectAtIndex:0]; | ||
| [thePlot deleteDataInIndexRange:NSMakeRange(0, 1)]; | ||
| } | ||
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| CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)theGraph.defaultPlotSpace; | ||
| plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromUnsignedInteger(currentIndex >= kMaxDataPoints ? currentIndex - kMaxDataPoints + 1: 0) | ||
| length:CPTDecimalFromUnsignedInteger(kMaxDataPoints - 1)]; | ||
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| currentIndex++; | ||
| [plotData addObject:[NSNumber numberWithDouble:(1.0 - kAlpha) * [[plotData lastObject] doubleValue] + kAlpha * rand() / (double)RAND_MAX]]; | ||
| [thePlot insertDataAtIndex:plotData.count - 1 numberOfRecords:1]; | ||
| } | ||
| } | ||
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| #pragma mark - | ||
| #pragma mark Plot Data Source Methods | ||
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| -(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot | ||
| { | ||
| return [plotData count]; | ||
| } | ||
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| -(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index | ||
| { | ||
| NSNumber *num = nil; | ||
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| switch ( fieldEnum ) { | ||
| case CPTScatterPlotFieldX: | ||
| num = [NSNumber numberWithUnsignedInteger:index + currentIndex - plotData.count]; | ||
| break; | ||
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| case CPTScatterPlotFieldY: | ||
| num = [plotData objectAtIndex:index]; | ||
| break; | ||
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| default: | ||
| break; | ||
| } | ||
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| return num; | ||
| } | ||
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| @end |