core plot x axis labels vertical - xcode

Question

I have a very crowded xy graph and I'm trying to display the x-axis labels vertically instead of the default horizontal. I can't find documentation on how to do this. Can anyone explain how to do this or point me to the right documentation? I have adjusted the x.labelrotation but it does rotate the x axis label
thanks.
#pragma mark - Chart behavior
-(void)initPlotThree {
[self configureHostThree];
[self configureGraphThree];
[self configurePlotsThree];
[self configureAxesThree];
}
-(void)configureHostThree {
self.hostView = [(CPTGraphHostingView *) [CPTGraphHostingView alloc] initWithFrame:self.view.bounds];
self.hostView.allowPinchScaling = YES;
[self.myViewThree addSubview:self.hostView];
CPTGraphHostingView *BarGraphView = [[CPTGraphHostingView alloc] init];
self.hostView.frame = CGRectMake(self.myViewThree.bounds.origin.x, self.myViewThree.bounds.origin.y, self.myViewThree.bounds.size.width, self.myViewThree.bounds.size.height);
[self.hostView addSubview:BarGraphView];
}
-(void)configureGraphThree {
// 1 - Create the graph
CPTGraph *graph = [[CPTXYGraph alloc] initWithFrame:self.hostView.bounds];
// [graph applyTheme:[CPTTheme themeNamed:kCPTSlateTheme]];
[graph applyTheme:[CPTTheme themeNamed:kCPTPlainWhiteTheme]];
self.hostView.hostedGraph = graph;
// 2 - Set graph title
NSString *title = #"Tremor";
graph.title = title;
// 3 - Create and set text style
CPTMutableTextStyle *titleStyle = [CPTMutableTextStyle textStyle];
titleStyle.color = [CPTColor blackColor];
titleStyle.fontName = #"Helvetica-Bold";
titleStyle.fontSize = 12.0f;
graph.titleTextStyle = titleStyle;
graph.titlePlotAreaFrameAnchor = CPTRectAnchorTop;
graph.titleDisplacement = CGPointMake(0.0f, 17.0f);
// 4 - Set padding for plot area
[graph.plotAreaFrame setPaddingLeft:1.0f];
[graph.plotAreaFrame setPaddingBottom:1.0f];
// 5 - Enable user interactions for plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
plotSpace.allowsUserInteraction = YES;
}
-(void)configurePlotsThree {
// 1 - Get graph and plot space
CPTGraph *graph = self.hostView.hostedGraph;
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *) graph.defaultPlotSpace;
// 2 - Create the plots
CPTScatterPlot *tremorPlot = [[CPTScatterPlot alloc] init];
tremorPlot.dataSource = self;
tremorPlot.identifier = tremorSCORE;
CPTColor *tremorColor = [CPTColor blueColor];
[graph addPlot:tremorPlot toPlotSpace:plotSpace];
// 3 - Set up plot space
[plotSpace scaleToFitPlots:[NSArray arrayWithObjects:tremorPlot, nil]];
CPTMutablePlotRange *xRange = [plotSpace.xRange mutableCopy];
[xRange expandRangeByFactor:CPTDecimalFromCGFloat(1.1f)];
plotSpace.xRange = xRange;
CPTMutablePlotRange *yRange = [plotSpace.yRange mutableCopy];
[yRange expandRangeByFactor:CPTDecimalFromCGFloat(1.2f)];
plotSpace.yRange = yRange;
// 4 - Create styles and symbols
CPTMutableLineStyle *tremorLineStyle = [tremorPlot.dataLineStyle mutableCopy];
tremorLineStyle.lineWidth = 2.0;
tremorLineStyle.lineColor = tremorColor;
tremorPlot.dataLineStyle = tremorLineStyle;
CPTMutableLineStyle *tremorSymbolLineStyle = [CPTMutableLineStyle lineStyle];
tremorSymbolLineStyle.lineColor = tremorColor;}
-(void)configureAxesThree {
// 1 - Create styles
CPTMutableTextStyle *axisTitleStyle = [CPTMutableTextStyle textStyle];
axisTitleStyle.color = [CPTColor blackColor];
axisTitleStyle.fontName = #"Helvetica-Bold";
axisTitleStyle.fontSize = 10.0f;
CPTMutableLineStyle *axisLineStyle = [CPTMutableLineStyle lineStyle];
axisLineStyle.lineWidth = .01f;
axisLineStyle.lineColor = [CPTColor blackColor];
CPTMutableTextStyle *axisTextStyle = [[CPTMutableTextStyle alloc] init];
axisTextStyle.color = [CPTColor blackColor];
axisTextStyle.fontName = #"Helvetica-Bold";
axisTextStyle.fontSize = 9.0f;
CPTMutableLineStyle *tickLineStyle = [CPTMutableLineStyle lineStyle];
tickLineStyle.lineColor = [CPTColor blackColor];
tickLineStyle.lineWidth = 1.0f;
CPTMutableLineStyle *gridLineStyle = [CPTMutableLineStyle lineStyle];
tickLineStyle.lineColor = [CPTColor blackColor];
tickLineStyle.lineWidth = 1.0f;
// 2 - Get axis set
CPTXYAxisSet *axisSet = (CPTXYAxisSet *) self.hostView.hostedGraph.axisSet;
// 3 - Configure x-axis
CPTAxis *x = axisSet.xAxis;
x.title = #"";
x.titleTextStyle = axisTitleStyle;
x.titleOffset = 20.0f;
x.axisLineStyle = axisLineStyle;
x.labelingPolicy = CPTAxisLabelingPolicyNone;
x.labelTextStyle = axisTextStyle;
x.majorTickLineStyle = axisLineStyle;
x.majorTickLength = 4.0f;
x.tickDirection = CPTSignNegative;
x.labelRotation = .6;
x.labelOffset = 15;
CGFloat dateCount = [self.dates count];
NSMutableSet *xLabels = [NSMutableSet setWithCapacity:dateCount];
NSMutableSet *xLocations = [NSMutableSet setWithCapacity:dateCount];
NSInteger i = 0;
for (NSString *date in self.dates) {
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:date textStyle:x.labelTextStyle];
CGFloat location = i++;
label.tickLocation = CPTDecimalFromCGFloat(location);
label.offset = x.majorTickLength;
if (label) {
[xLabels addObject:label];
[xLocations addObject:[NSNumber numberWithFloat:location]];
}
}
x.axisLabels = xLabels;
x.majorTickLocations = xLocations;
// CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
axisSet.xAxis.axisConstraints = [CPTConstraints constraintWithLowerOffset:15.0]; // 8-22
// 4 - Configure y-axis
CPTAxis *y = axisSet.yAxis;
y.title = #"";
y.titleTextStyle = axisTitleStyle;
y.titleOffset = -40.0f;
y.axisLineStyle = axisLineStyle;
y.majorGridLineStyle = nil;
y.labelingPolicy = CPTAxisLabelingPolicyNone;
y.labelTextStyle = nil;
y.labelOffset = 16.0f;
y.majorTickLineStyle = nil;
y.majorTickLength = 4.0f;
y.minorTickLength = 1.0f;
y.tickDirection = CPTSignPositive;
NSInteger majorIncrement = 2;
NSInteger minorIncrement = 1;
CGFloat yMax = 700.0f; // should determine dynamically based on max price
NSMutableSet *yLabels = [NSMutableSet set];
NSMutableSet *yMajorLocations = [NSMutableSet set];
NSMutableSet *yMinorLocations = [NSMutableSet set];
for (NSInteger j = minorIncrement; j <= yMax; j += minorIncrement) {
NSUInteger mod = j % majorIncrement;
if (mod == 0) {
CPTAxisLabel *label = [[CPTAxisLabel alloc] initWithText:[NSString stringWithFormat:#"%li", (long)j] textStyle:y.labelTextStyle];
NSDecimal location = CPTDecimalFromInteger(j);
label.tickLocation = location;
label.offset = -y.majorTickLength - y.labelOffset;
if (label) {
[yLabels addObject:label];
}
[yMajorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:location]];
[yMajorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:location]];
} else {
[yMinorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromInteger(j)]];
[yMinorLocations addObject:[NSDecimalNumber decimalNumberWithDecimal:CPTDecimalFromInteger(j)]];
}
}
y.axisLabels = yLabels;
y.majorTickLocations = yMajorLocations;
y.minorTickLocations = yMinorLocations;
}

Answer 1

Set the labelRotation on the x-axis to rotate the labels when using one of the automatic labelling policies. When creating custom labels, you need to set the rotation on each label directly.