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POWhy won't my x-axis show with core-plot on the iPhone?
 

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  1. POWhy won't my x-axis show with core-plot on the iPhone?
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    <p><strong>EDIT: I think my question is better phrased as: How can I have a Y-axis that doesn't start at zero? It seems like the x-axis always gets placed at the y=0, but I would like the x-axis to be at some positive number on the y-axis.</strong></p> <p><strong>Here's a graph with more regular data... I just wish the x-axis was placed at the minimum y-value for the plot (about 77), instead of at 0.</strong></p> <p><img src="https://farm5.static.flickr.com/4015/4271186240_8e2f8f73c9.jpg" alt="alt text"></p> <p>Here is the function I use to create the graph.</p> <p>It's a whole bunch of code, and I'm not quite sure which piece might be off to not display the x-axis. </p> <p>Could the x-axis not showing have something to do with my data?</p> <pre><code>- (void) showGraph:(SavedDetailScreen*)dataSource { // create the graph and add it to the view CPXYGraph *graph = [[CPXYGraph alloc] initWithFrame: CGRectZero]; graph.plotArea.masksToBorder = NO; CPLayerHostingView *graphView = [[CPLayerHostingView alloc] initWithFrame:CGRectMake(0,0, 280, 240)]; [self addSubview:graphView]; graphView.hostedLayer = graph; graph.paddingLeft = 50.0; graph.paddingTop = 20.0; graph.paddingRight = 10.0; graph.paddingBottom = 40.0; // set up the ranges for the graph axis float minElevation = dataSource.track.tbStats.minAlt; float maxElevation = dataSource.track.tbStats.maxAlt-dataSource.track.tbStats.minAlt; float minDistance = 0.0f; float maxDistance = dataSource.track.tbStats.totalDistance; CPXYPlotSpace *plotSpace = (CPXYPlotSpace *)graph.defaultPlotSpace; plotSpace.xRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(minDistance) length:CPDecimalFromFloat(maxDistance)]; plotSpace.yRange = [CPPlotRange plotRangeWithLocation:CPDecimalFromFloat(minElevation) length:CPDecimalFromFloat(maxElevation)]; // style the graph with white text and lines CPTextStyle *whiteText = [CPTextStyle textStyle]; whiteText.color = [CPColor whiteColor]; CPLineStyle *whiteStyle = [CPLineStyle lineStyle]; whiteStyle.lineColor = [CPColor whiteColor]; whiteStyle.lineWidth = 2.0f; // set up the axis CPXYAxisSet *axisSet = (CPXYAxisSet *)graph.axisSet; CPXYAxis *x = axisSet.xAxis; CPXYAxis *y = axisSet.yAxis; x.majorIntervalLength = CPDecimalFromFloat(maxDistance/10.0f); x.minorTicksPerInterval = 0; x.majorTickLineStyle = whiteStyle; x.minorTickLineStyle = whiteStyle; x.axisLineStyle = whiteStyle; x.minorTickLength = 5.0f; x.majorTickLength = 10.0f; x.labelOffset = 3.0f; x.labelTextStyle = whiteText; y.majorIntervalLength = CPDecimalFromFloat(maxElevation/5.0f); y.minorTicksPerInterval = 0; y.majorTickLineStyle = whiteStyle; y.minorTickLineStyle = whiteStyle; y.axisLineStyle = whiteStyle; y.minorTickLength = 5.0f; y.majorTickLength = 10.0f; y.labelOffset = 3.0f; y.labelTextStyle = whiteText; CPScatterPlot *plot = [[[CPScatterPlot alloc] initWithFrame:graph.bounds] autorelease]; plot.dataLineStyle.lineWidth = 2.0f; plot.dataLineStyle.lineColor = [CPColor blueColor]; plot.dataSource = dataSource; [graph addPlot:plot]; CPPlotSymbol *greenCirclePlotSymbol = [CPPlotSymbol ellipsePlotSymbol]; greenCirclePlotSymbol.fill = [CPFill fillWithColor:[CPColor greenColor]]; greenCirclePlotSymbol.size = CGSizeMake(2.0, 2.0); plot.plotSymbol = greenCirclePlotSymbol; } </code></pre> <p><img src="https://farm5.static.flickr.com/4042/4270334347_d291f65f3a.jpg" alt="alt text"></p>
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