Enable x-Axis (Horizontal) scroll in coreplot - ios

Question

I am using code from this link . And currently If I have 50 bar columns or 150 bar columns then the labels below is compressed and I would like to have horizontal scroll on x-Axis instead of having compressed x-Axis.
I have tried this:
plotSpace.xRange = CPTPlotRangeplotRangeWithLocation:CPTDecimalFromInt(-1)length:CPTDecimalFromInt(50)];
Attaching code from the file :
#import "GraphView.h"
#implementation GraphView
- (void)generateData
{
NSMutableDictionary *dataTemp = [[NSMutableDictionary alloc] init];
//Array containing all the dates that will be displayed on the X axis
dates = [NSArray arrayWithObjects:#"2012-05-01", #"2012-05-02", #"2012-05-03",
#"2012-05-04", #"2012-05-05", #"2012-05-06", #"2012-05-07", nil];
//Dictionary containing the name of the two sets and their associated color
//used for the demo
sets = [NSDictionary dictionaryWithObjectsAndKeys:[UIColor blueColor], #"Plot 1",
[UIColor redColor], #"Plot 2",
[UIColor greenColor], #"Plot 3", nil];
//Generate random data for each set of data that will be displayed for each day
//Numbers between 1 and 10
for (NSString *date in dates) {
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
for (NSString *set in sets) {
NSNumber *num = [NSNumber numberWithInt:arc4random_uniform(10)+1];
[dict setObject:num forKey:set];
}
[dataTemp setObject:dict forKey:date];
}
data = [dataTemp copy];
[dataTemp release];
NSLog(#"%#", data);
}
- (void)generateLayout
{
//Create graph from theme
graph = [[CPTXYGraph alloc] initWithFrame:CGRectZero];
[graph applyTheme:[CPTTheme themeNamed:kCPTStocksTheme]];
self.hostedGraph = graph;
graph.plotAreaFrame.masksToBorder = NO;
graph.paddingLeft = 0.0f;
graph.paddingTop = 0.0f;
graph.paddingRight = 0.0f;
graph.paddingBottom = 0.0f;
CPTMutableLineStyle *borderLineStyle = [CPTMutableLineStyle lineStyle];
borderLineStyle.lineColor = [CPTColor whiteColor];
borderLineStyle.lineWidth = 2.0f;
graph.plotAreaFrame.borderLineStyle = borderLineStyle;
graph.plotAreaFrame.paddingTop = 10.0;
graph.plotAreaFrame.paddingRight = 10.0;
graph.plotAreaFrame.paddingBottom = 80.0;
graph.plotAreaFrame.paddingLeft = 70.0;
//Add plot space
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)graph.defaultPlotSpace;
plotSpace.delegate = self;
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(0)
length:CPTDecimalFromInt(10 * sets.count)];
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromInt(-1)
length:CPTDecimalFromInt(8)];
//Grid line styles
CPTMutableLineStyle *majorGridLineStyle = [CPTMutableLineStyle lineStyle];
majorGridLineStyle.lineWidth = 0.75;
majorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.1];
CPTMutableLineStyle *minorGridLineStyle = [CPTMutableLineStyle lineStyle];
minorGridLineStyle.lineWidth = 0.25;
minorGridLineStyle.lineColor = [[CPTColor whiteColor] colorWithAlphaComponent:0.1];
//Axes
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)graph.axisSet;
//X axis
CPTXYAxis *x = axisSet.xAxis;
x.orthogonalCoordinateDecimal = CPTDecimalFromInt(0);
x.majorIntervalLength = CPTDecimalFromInt(1);
x.minorTicksPerInterval = 0;
x.labelingPolicy = CPTAxisLabelingPolicyNone;
x.majorGridLineStyle = majorGridLineStyle;
x.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];
//X labels
int labelLocations = 0;
NSMutableArray *customXLabels = [NSMutableArray array];
for (NSString *day in dates) {
CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText:day textStyle:x.labelTextStyle];
newLabel.tickLocation = [[NSNumber numberWithInt:labelLocations] decimalValue];
newLabel.offset = x.labelOffset + x.majorTickLength;
newLabel.rotation = M_PI / 4;
[customXLabels addObject:newLabel];
labelLocations++;
[newLabel release];
}
x.axisLabels = [NSSet setWithArray:customXLabels];
//Y axis
CPTXYAxis *y = axisSet.yAxis;
y.title = #"Value";
y.titleOffset = 50.0f;
y.labelingPolicy = CPTAxisLabelingPolicyAutomatic;
y.majorGridLineStyle = majorGridLineStyle;
y.minorGridLineStyle = minorGridLineStyle;
y.axisConstraints = [CPTConstraints constraintWithLowerOffset:0.0];
//Create a bar line style
CPTMutableLineStyle *barLineStyle = [[[CPTMutableLineStyle alloc] init] autorelease];
barLineStyle.lineWidth = 1.0;
barLineStyle.lineColor = [CPTColor whiteColor];
CPTMutableTextStyle *whiteTextStyle = [CPTMutableTextStyle textStyle];
whiteTextStyle.color = [CPTColor whiteColor];
//Plot
BOOL firstPlot = YES;
for (NSString *set in [[sets allKeys] sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)]) {
CPTBarPlot *plot = [CPTBarPlot tubularBarPlotWithColor:[CPTColor blueColor] horizontalBars:NO];
plot.lineStyle = barLineStyle;
CGColorRef color = ((UIColor *)[sets objectForKey:set]).CGColor;
plot.fill = [CPTFill fillWithColor:[CPTColor colorWithCGColor:color]];
if (firstPlot) {
plot.barBasesVary = NO;
firstPlot = NO;
} else {
plot.barBasesVary = YES;
}
plot.barWidth = CPTDecimalFromFloat(0.8f);
plot.barsAreHorizontal = NO;
plot.dataSource = self;
plot.identifier = set;
[graph addPlot:plot toPlotSpace:plotSpace];
}
//Add legend
CPTLegend *theLegend = [CPTLegend legendWithGraph:graph];
theLegend.numberOfRows = sets.count;
theLegend.fill = [CPTFill fillWithColor:[CPTColor colorWithGenericGray:0.15]];
theLegend.borderLineStyle = barLineStyle;
theLegend.cornerRadius = 10.0;
theLegend.swatchSize = CGSizeMake(15.0, 15.0);
whiteTextStyle.fontSize = 13.0;
theLegend.textStyle = whiteTextStyle;
theLegend.rowMargin = 5.0;
theLegend.paddingLeft = 10.0;
theLegend.paddingTop = 10.0;
theLegend.paddingRight = 10.0;
theLegend.paddingBottom = 10.0;
graph.legend = theLegend;
graph.legendAnchor = CPTRectAnchorTopLeft;
graph.legendDisplacement = CGPointMake(80.0, -10.0);
}
- (void)createGraph
{
//Generate data
[self generateData];
//Generate layout
[self generateLayout];
}
- (void)dealloc
{
[data release];
[super dealloc];
}
#pragma mark - CPTPlotDataSource methods
- (NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
return dates.count;
}
- (double)doubleForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
double num = NAN;
//X Value
if (fieldEnum == 0) {
num = index;
}
else {
double offset = 0;
if (((CPTBarPlot *)plot).barBasesVary) {
for (NSString *set in [[sets allKeys] sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)]) {
if ([plot.identifier isEqual:set]) {
break;
}
offset += [[[data objectForKey:[dates objectAtIndex:index]] objectForKey:set] doubleValue];
}
}
//Y Value
if (fieldEnum == 1) {
num = [[[data objectForKey:[dates objectAtIndex:index]] objectForKey:plot.identifier] doubleValue] + offset;
}
//Offset for stacked bar
else {
num = offset;
}
}
//NSLog(#"%# - %d - %d - %f", plot.identifier, index, fieldEnum, num);
return num;
}
#pragma mark - CPTBarPlotDelegate methods
-(void)barPlot:(CPTBarPlot *)plot barWasSelectedAtRecordIndex:(NSUInteger)index {
NSLog(#"barWasSelectedAtRecordIndex %d", index);
}
#end

Answer 1

to get scrolling you need to set the globalXRange on the plotspace to be the entire range, and set the xRange will be the visible area.
for example a globalXRange of 0-150, and a xRange of 0-50. then you could scroll up to view the 51-150 range.