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POCore-Plot: Personalizing Plot
 

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    <p><br> I'm experimenting the Core Plot library for iOS. I've managed to show a graph with my information, however i'm unable to personalize the visualization as I want.<br> I'm trying to use a simple scatter plot to show the distance a user has traveled by day, between two dates. I've managed to create the data for plotting, but i'm having a hard time personalizing the plot, maybe somebody that has used this lib can help me ;)<br> My question is:<br> - If I only show the positive side of both x and y axis, I'm not able to see the labels.<br> - For example, if there are 31 days between the two dates, the x axis goes from 0 to 30. How do i change the labels to show the date, for instance startDate + x. This is what I've done so far:</p> <pre><code>@interface DistanceChart : CPGraphHostingView &lt;CPPlotDataSource&gt; { CPXYGraph *graph; NSMutableArray *dataForPlot; RouteManager *routeManager; NSDate *startDate; NSDate *endDate; } @property (nonatomic, retain) NSMutableArray *dataForPlot; @property (nonatomic, retain) RouteManager *routeManager; @property (nonatomic, retain) NSDate *startDate; @property (nonatomic, retain) NSDate *endDate; - (void)initPlot; @end @implementation DistanceChart @synthesize dataForPlot; @synthesize routeManager; @synthesize startDate; @synthesize endDate; - (void)initPlot { NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"dd-MM-yyyy"]; self.startDate = [dateFormatter dateFromString:@"01-05-2011"]; self.endDate = [dateFormatter dateFromString:@"31-05-2011"]; //get the data self.dataForPlot = [routeManager getTotalDistanceByDay:routeManager.routes from:startDate to:endDate]; NSLog(@"Data: %@", dataForPlot); graph = [[CPXYGraph alloc] initWithFrame:CGRectZero]; self.hostedGraph = graph; graph.paddingLeft = 5; graph.paddingTop = 5; graph.paddingRight = 5; graph.paddingBottom = 5; // Setup plot space int days = [endDate timeIntervalSinceDate:startDate] / 60 / 60 / 24 + 1; CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace; plotSpace.allowsUserInteraction = YES; plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0) length:CPDecimalFromFloat(days)]; plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(0) length:CPDecimalFromFloat(15)]; //TODO: set maximum Y according to max distance // Axes CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet; CPXYAxis *x = axisSet.xAxis; x.majorIntervalLength = CPDecimalFromString(@"1"); x.orthogonalCoordinateDecimal = CPDecimalFromString(@"0"); x.minorTicksPerInterval = 1; CPXYAxis *y = axisSet.yAxis; y.majorIntervalLength = CPDecimalFromString(@"1"); y.minorTicksPerInterval = 1; y.orthogonalCoordinateDecimal = CPDecimalFromString(@"0"); x.labelRotation = M_PI/8; // Create a green plot area CPScatterPlot *dataSourceLinePlot = [[[CPScatterPlot alloc] init] autorelease]; dataSourceLinePlot.identifier = @"Green Plot"; CPMutableLineStyle *lineStyle = [[dataSourceLinePlot.dataLineStyle mutableCopy] autorelease]; lineStyle.lineWidth = 2.f; lineStyle.lineColor = [CPColor greenColor]; dataSourceLinePlot.dataLineStyle = lineStyle; dataSourceLinePlot.dataSource = self; // Put an area gradient under the plot above CPColor *areaColor = [CPColor colorWithComponentRed:0.3 green:1.0 blue:0.3 alpha:0.8]; CPGradient *areaGradient = [CPGradient gradientWithBeginningColor:areaColor endingColor:[CPColor clearColor]]; areaGradient.angle = -90.0f; CPFill *areaGradientFill = [CPFill fillWithGradient:areaGradient]; dataSourceLinePlot.areaFill = areaGradientFill; dataSourceLinePlot.areaBaseValue = CPDecimalFromString(@"1.75"); // Animate in the new plot, as an example dataSourceLinePlot.opacity = 0.0f; dataSourceLinePlot.cachePrecision = CPPlotCachePrecisionDecimal; [graph addPlot:dataSourceLinePlot]; CABasicAnimation *fadeInAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"]; fadeInAnimation.duration = 1.0f; fadeInAnimation.removedOnCompletion = NO; fadeInAnimation.fillMode = kCAFillModeForwards; fadeInAnimation.toValue = [NSNumber numberWithFloat:1.0]; [dataSourceLinePlot addAnimation:fadeInAnimation forKey:@"animateOpacity"]; } #pragma mark - #pragma mark Plot Data Source Methods - (NSUInteger)numberOfRecordsForPlot:(CPPlot *)plot { return [dataForPlot count]; } - (NSNumber *)numberForPlot:(CPPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index { NSDecimalNumber *num = [[dataForPlot objectAtIndex:index] valueForKey:(fieldEnum == CPScatterPlotFieldX ? @"x" : @"y")]; return num; } - (CPLayer *)dataLabelForPlot:(CPPlot *)plot recordIndex:(NSUInteger)index { return nil; } - (void)dealloc { [dataForPlot release]; [routeManager release]; [startDate release]; [endDate release]; [super dealloc]; } @end </code></pre>
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