Basically, I have this class which I am using to display data in a CorePlot bar chart:
#import "BarChartViewController.h"
#import "AppDelegate.h"
#import "Project.h"
#import "Currency.h"
#import "TotalValueCalculator.h"
#define BAR_POSITION @"POSITION"
#define BAR_HEIGHT @"HEIGHT"
#define COLOR @"COLOR"
#define CATEGORY @"CATEGORY"
#define AXIS_START 0
@interface BarChartViewController ()
@end
@implementation BarChartViewController
{
int count;
}
@synthesize data;
@synthesize graph;
@synthesize hostingView;
@synthesize graphType;
//Finds the maximum value from an array of ints
int findMax (int numbers[], int N){
int max = numbers[0];
for (int i = 0; i < N; i++)
if(max<numbers[i]) max = numbers[i];
return max;
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
}
return self;
}
- (void) generateBarPlot
{
//Create host view
self.hostingView = [[CPTGraphHostingView alloc]
initWithFrame:[[UIScreen mainScreen]bounds]];
[self.view addSubview:self.hostingView];
//Create graph and set it as host view's graph
self.graph = [[CPTXYGraph alloc] initWithFrame:self.hostingView.bounds];
[self.hostingView setHostedGraph:self.graph];
//set graph padding and theme
self.graph.plotAreaFrame.paddingTop = 20.0f;
self.graph.plotAreaFrame.paddingRight = 20.0f;
self.graph.plotAreaFrame.paddingBottom = 170.0f;
self.graph.plotAreaFrame.paddingLeft = 70.0f;
[self.graph applyTheme:[CPTTheme themeNamed:kCPTDarkGradientTheme]];
//set axes ranges
CPTXYPlotSpace *plotSpace = (CPTXYPlotSpace *)self.graph.defaultPlotSpace;
plotSpace.xRange = [CPTPlotRange plotRangeWithLocation:CPTDecimalFromFloat(AXIS_START) length:CPTDecimalFromFloat(50)];
plotSpace.yRange = [CPTPlotRange plotRangeWithLocation:
CPTDecimalFromFloat(AXIS_START)
length:CPTDecimalFromFloat((axisEnd - AXIS_START)+5)];
CPTXYAxisSet *axisSet = (CPTXYAxisSet *)self.graph.axisSet;
//set axes' title, labels and their text styles
CPTMutableTextStyle *textStyle = [CPTMutableTextStyle textStyle];
textStyle.fontName = @"Helvetica";
textStyle.fontSize = 14;
textStyle.color = [CPTColor whiteColor];
if (graphType == @"TotalProject"){
axisSet.xAxis.title = @"Project Name";
}
else if (graphType == @"TotalCategory"){
axisSet.xAxis.title = @"Category Name";
}
else if (graphType == @"TotalCurrency"){
axisSet.xAxis.title = @"Currency Name";
}
else if (graphType == @"DistanceTravelled"){
axisSet.xAxis.title = @"Project";
}
else if (graphType == @"FuelCostProject"){
axisSet.xAxis.title = @"Project";
}
else if (graphType == @"FuelCostCurrency"){
axisSet.xAxis.title = @"Currency";
}
axisSet.yAxis.title = @"Total Value";
axisSet.xAxis.titleTextStyle = textStyle;
axisSet.yAxis.titleTextStyle = textStyle;
axisSet.xAxis.titleOffset = 50.0f;
axisSet.yAxis.titleOffset = 50.0f;
axisSet.xAxis.labelTextStyle = textStyle;
axisSet.xAxis.labelOffset = 3.0f;
axisSet.yAxis.labelTextStyle = textStyle;
axisSet.yAxis.labelOffset = 3.0f;
//set axes' line styles and interval ticks
CPTMutableLineStyle *lineStyle = [CPTMutableLineStyle lineStyle];
lineStyle.lineColor = [CPTColor whiteColor];
lineStyle.lineWidth = 3.0f;
axisSet.xAxis.axisLineStyle = lineStyle;
axisSet.yAxis.axisLineStyle = lineStyle;
axisSet.xAxis.majorTickLineStyle = lineStyle;
axisSet.yAxis.majorTickLineStyle = lineStyle;
//Set x axis tick length to 0 as there is no data on the x axis
axisSet.xAxis.majorIntervalLength = CPTDecimalFromFloat(0.0f);
if (axisEnd <= 400){
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(25.0f);
}
else if (axisEnd <= 900){
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(50.0f);
}
else if (axisEnd <= 1300){
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(75.0f);
}
else if (axisEnd <= 1800){
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(100.0f);
}
else if (axisEnd <= 2300){
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(125.0f);
}
else if (axisEnd <= 2800){
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(150.0f);
}
else if (axisEnd <= 3300){
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(175.0f);
}
else if (axisEnd <= 3500){
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(200.0f);
}
else {
axisSet.yAxis.majorIntervalLength = CPTDecimalFromFloat(300.0f);
}
axisSet.xAxis.majorTickLength = 7.0f;
axisSet.yAxis.majorTickLength = 7.0f;
axisSet.xAxis.minorTickLineStyle = lineStyle;
axisSet.yAxis.minorTickLineStyle = lineStyle;
axisSet.xAxis.minorTicksPerInterval = 1;
axisSet.yAxis.minorTicksPerInterval = 1;
axisSet.xAxis.minorTickLength = 5.0f;
axisSet.yAxis.minorTickLength = 5.0f;
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setNumberStyle:NSNumberFormatterDecimalStyle];
[numberFormatter setMaximumFractionDigits:2];
[numberFormatter setPositiveFormat:@"###0.00"];
axisSet.yAxis.labelFormatter = numberFormatter;
int initialTickLocation = 9;
AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
NSMutableArray *customTickLocations = [[NSMutableArray alloc] init];
NSMutableArray *xAxisLabels = [[NSMutableArray alloc] init];
if (graphType == @"TotalProject"){
for (int i = 0; i < [appDelegate.projects count]; i++){
//CHANGE THESE NUMBERS TO CHANGE POSITIONS OF THE LABELS
[customTickLocations addObject:[NSNumber numberWithInt:initialTickLocation]];
initialTickLocation = initialTickLocation + 7;
[xAxisLabels addObject:[[appDelegate.projects objectAtIndex:i] name]];
}
}
else if (graphType == @"TotalCategory"){
for (int i = 0; i < [appDelegate.categories count]; i++){
//CHANGE THESE NUMBERS TO CHANGE POSITIONS OF THE LABELS
[customTickLocations addObject:[NSNumber numberWithInt:initialTickLocation]];
initialTickLocation = initialTickLocation + 7;
[xAxisLabels addObject:[[appDelegate.categories objectAtIndex:i] name]];
}
}
else if (graphType == @"TotalCurrency"){
for (int i = 0; i < [appDelegate.currencies count]; i++){
//CHANGE THESE NUMBERS TO CHANGE POSITIONS OF THE LABELS
[customTickLocations addObject:[NSNumber numberWithInt:initialTickLocation]];
initialTickLocation = initialTickLocation + 7;
[xAxisLabels addObject:[[appDelegate.currencies objectAtIndex:i] shortName]];
}
}
else if (graphType == @"DistanceTravelled"){
for (int i = 0; i < [appDelegate.projects count]; i++){
//CHANGE THESE NUMBERS TO CHANGE POSITIONS OF THE LABELS
[customTickLocations addObject:[NSNumber numberWithInt:initialTickLocation]];
initialTickLocation = initialTickLocation + 7;
[xAxisLabels addObject:[[appDelegate.projects objectAtIndex:i] name]];
}
}
else if (graphType == @"FuelCostProject"){
for (int i = 0; i < [appDelegate.projects count]; i++){
//CHANGE THESE NUMBERS TO CHANGE POSITIONS OF THE LABELS
[customTickLocations addObject:[NSNumber numberWithInt:initialTickLocation]];
initialTickLocation = initialTickLocation + 7;
[xAxisLabels addObject:[[appDelegate.projects objectAtIndex:i] name]];
}
}
else if (graphType == @"FuelCostCurrency"){
for (int i = 0; i < [appDelegate.currencies count]; i++){
//CHANGE THESE NUMBERS TO CHANGE POSITIONS OF THE LABELS
[customTickLocations addObject:[NSNumber numberWithInt:initialTickLocation]];
initialTickLocation = initialTickLocation + 7;
[xAxisLabels addObject:[[appDelegate.currencies objectAtIndex:i] shortName]];
}
}
axisSet.xAxis.labelRotation = M_PI/4;
axisSet.xAxis.labelingPolicy = CPTAxisLabelingPolicyNone;
NSUInteger labelLocation = 0;
NSMutableArray *customLabels = [NSMutableArray arrayWithCapacity:[xAxisLabels count]];
for (NSNumber *tickLocation in customTickLocations){
CPTAxisLabel *newLabel = [[CPTAxisLabel alloc] initWithText:[xAxisLabels objectAtIndex:labelLocation++] textStyle:axisSet.xAxis.labelTextStyle];
newLabel.tickLocation = [tickLocation decimalValue];
newLabel.offset = axisSet.xAxis.labelOffset + axisSet.xAxis.majorTickLength;
newLabel.rotation = M_PI / 4;
[customLabels addObject:newLabel];
}
axisSet.xAxis.axisLabels = [NSSet setWithArray:customLabels];
// Create bar plot and add it to the graph
CPTBarPlot *plot = [[CPTBarPlot alloc] init] ;
plot.dataSource = self;
plot.delegate = self;
plot.barWidth = [[NSDecimalNumber decimalNumberWithString:@"5.0"]
decimalValue];
plot.barOffset = [[NSDecimalNumber decimalNumberWithString:@"10.0"]
decimalValue];
plot.barCornerRadius = 5.0;
// Remove bar outlines
CPTMutableLineStyle *borderLineStyle = [CPTMutableLineStyle lineStyle];
borderLineStyle.lineColor = [CPTColor clearColor];
plot.lineStyle = borderLineStyle;
// Identifiers are handy if you want multiple plots in one graph
plot.identifier = @"projectTotals";
[self.graph addPlot:plot];
}
-(NSUInteger)numberOfRecordsForPlot:(CPTPlot *)plot
{
return [self.data count];
}
-(NSNumber *)numberForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndex:(NSUInteger)index
{
NSDictionary *bar = [self.data objectAtIndex:index];
if(fieldEnum == CPTBarPlotFieldBarLocation){
NSLog(@"Position: %@", [bar valueForKey:BAR_POSITION]);
return [bar valueForKey:BAR_POSITION];
}
else{
NSLog(@"Height: %@", [bar valueForKey:BAR_HEIGHT]);
return [bar valueForKey:BAR_HEIGHT];
}
}
-(CPTLayer *)dataLabelForPlot:(CPTPlot *)plot recordIndex:(NSUInteger)index
{
CPTMutableTextStyle *textStyle = [CPTMutableTextStyle textStyle];
textStyle.fontName = @"Helvetica";
textStyle.fontSize = 12;
textStyle.color = [CPTColor whiteColor];
NSDictionary *bar = [self.data objectAtIndex:index];
//Here we want to display the value for that day, not the name of the day
CPTTextLayer *label = [[CPTTextLayer alloc] initWithText:[NSString stringWithFormat:@"%0.2f", [[bar valueForKey:BAR_HEIGHT] floatValue]]];
label.textStyle =textStyle;
return label;
}
-(CPTFill *)barFillForBarPlot:(CPTBarPlot *)barPlot
recordIndex:(NSUInteger)index
{
NSDictionary *bar = [self.data objectAtIndex:index];
CPTGradient *gradient = [CPTGradient gradientWithBeginningColor:[CPTColor whiteColor]
endingColor:[bar valueForKey:@"COLOR"]
beginningPosition:0.0 endingPosition:0.3 ];
[gradient setGradientType:CPTGradientTypeAxial];
[gradient setAngle:320.0];
CPTFill *fill = [CPTFill fillWithGradient:gradient];
return fill;
}
- (void)dealloc
{
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
- (void)viewDidLoad
{
[super viewDidLoad];
self.data = [NSMutableArray array];
AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
count = [appDelegate.projects count];
int catCount = [appDelegate.categories count];
int currencyCount = [appDelegate.currencies count];
int bar_heights[count];
NSString *categories[count];
int catBar_heights[catCount];
NSString *catCategories[catCount];
int currencyBar_heights[currencyCount];
NSString *currencyCategories[currencyCount];
if ([graphType isEqualToString:@"TotalProject"])
{
for (int i = 0; i < count; i++)
{
TotalValueCalculator *calc = [[TotalValueCalculator alloc] initWithString:[[appDelegate.projects objectAtIndex:i] name]];
NSString *totalValueString = [calc compareProject];
float totalValue = [totalValueString floatValue];
bar_heights[i] = totalValue;
NSLog(@"---%0.2f", totalValue);
categories[i] = [[appDelegate.projects objectAtIndex:i] name];
}
axisEnd = findMax(bar_heights, count) + ((findMax(bar_heights, count)) / 10);
UIColor *colors[] = {
[UIColor colorWithRed:139/255.0 green:198/255.0 blue:63/255.0 alpha:1],
nil};
for (int i = 0; i < [appDelegate.projects count] ; i++){
int position = i*7; //Bars will be 7 pts away from each other
float height = bar_heights[i];
NSDictionary *bar = [NSDictionary dictionaryWithObjectsAndKeys:
[NSDecimalNumber numberWithFloat:position],BAR_POSITION,
[NSDecimalNumber numberWithFloat:height],BAR_HEIGHT,
colors[0],COLOR,
categories[i],CATEGORY,
nil];
NSLog(@"^^^^^^^^^^^^^%@", [NSDecimalNumber numberWithFloat:height]);
[self.data addObject:bar];
}
}
else if ([graphType isEqualToString:@"TotalCategory"])
{
for (int i = 0; i < catCount; i++)
{
TotalValueCalculator *calc = [[TotalValueCalculator alloc] initWithString:[[appDelegate.categories objectAtIndex:i] name]];
NSString *totalValueString = [calc compareCategory];
double totalValue = [totalValueString doubleValue];
catBar_heights[i] = totalValue;
catCategories[i] = [[appDelegate.categories objectAtIndex:i] name];
}
axisEnd = findMax(catBar_heights, catCount) + ((findMax(catBar_heights, catCount)) / 10);
UIColor *colors[] = {
[UIColor colorWithRed:236/255.0 green:139/255.0 blue:34/255.0 alpha:1],
nil};
for (int i = 0; i < [appDelegate.categories count] ; i++){
double position = i*7; //Bars will be 7 pts away from each other
double height = catBar_heights[i];
NSDictionary *bar = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithDouble:position],BAR_POSITION,
[NSNumber numberWithDouble:height],BAR_HEIGHT,
colors[0],COLOR,
catCategories[i],CATEGORY,
nil];
[self.data addObject:bar];
}
}
else if ([graphType isEqualToString:@"TotalCurrency"])
{
for (int i = 0; i < currencyCount; i++)
{
TotalValueCalculator *calc = [[TotalValueCalculator alloc] initWithString:[[appDelegate.currencies objectAtIndex:i] shortName]];
NSString *totalValueString = [calc compareCurrency];
double totalValue = [totalValueString doubleValue];
currencyBar_heights[i] = totalValue;
currencyCategories[i] = [[appDelegate.currencies objectAtIndex:i] shortName];
}
axisEnd = findMax(currencyBar_heights, currencyCount) + ((findMax(currencyBar_heights, currencyCount)) / 10);
UIColor *colors[] = {
[UIColor colorWithRed:236/255.0 green:139/255.0 blue:34/255.0 alpha:1],
nil};
for (int i = 0; i < [appDelegate.currencies count] ; i++){
double position = i*7; //Bars will be 7 pts away from each other
double height = currencyBar_heights[i];
NSDictionary *bar = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithDouble:position],BAR_POSITION,
[NSNumber numberWithDouble:height],BAR_HEIGHT,
colors[0],COLOR,
currencyCategories[i],CATEGORY,
nil];
[self.data addObject:bar];
}
}
else if ([graphType isEqualToString:@"DistanceTravelled"])
{
for (int i = 0; i < count; i++)
{
TotalValueCalculator *calc = [[TotalValueCalculator alloc] initWithString:[[appDelegate.projects objectAtIndex:i] name]];
NSString *totalValueString = [calc compareProjectDistance];
double totalValue = [totalValueString doubleValue];
bar_heights[i] = totalValue;
categories[i] = [[appDelegate.projects objectAtIndex:i] name];
}
axisEnd = findMax(bar_heights, count) + ((findMax(bar_heights, count)) / 10);
UIColor *colors[] = {
[UIColor colorWithRed:236/255.0 green:139/255.0 blue:34/255.0 alpha:1],
nil};
for (int i = 0; i < [appDelegate.projects count] ; i++){
double position = i*7; //Bars will be 7 pts away from each other
double height = bar_heights[i];
NSDictionary *bar = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithDouble:position],BAR_POSITION,
[NSNumber numberWithDouble:height],BAR_HEIGHT,
colors[0],COLOR,
categories[i],CATEGORY,
nil];
[self.data addObject:bar];
}
}
else if ([graphType isEqualToString:@"FuelCostProject"])
{
for (int i = 0; i < count; i++)
{
TotalValueCalculator *calc = [[TotalValueCalculator alloc] initWithString:[[appDelegate.projects objectAtIndex:i] name]];
NSString *totalValueString = [calc compareProjectFuel];
double totalValue = [totalValueString doubleValue];
bar_heights[i] = totalValue;
categories[i] = [[appDelegate.projects objectAtIndex:i] name];
}
axisEnd = findMax(bar_heights, count) + ((findMax(bar_heights, count)) / 10);
UIColor *colors[] = {
[UIColor colorWithRed:236/255.0 green:139/255.0 blue:34/255.0 alpha:1],
nil};
for (int i = 0; i < [appDelegate.projects count] ; i++){
double position = i*7; //Bars will be 7 pts away from each other
double height = bar_heights[i];
NSDictionary *bar = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithDouble:position],BAR_POSITION,
[NSNumber numberWithDouble:height],BAR_HEIGHT,
colors[0],COLOR,
categories[i],CATEGORY,
nil];
[self.data addObject:bar];
}
}
else if ([graphType isEqualToString:@"FuelCostCurrency"])
{
for (int i = 0; i < currencyCount; i++)
{
TotalValueCalculator *calc = [[TotalValueCalculator alloc] initWithString:[[appDelegate.currencies objectAtIndex:i] shortName]];
NSString *totalValueString = [calc compareCurrencyFuel];
double totalValue = [totalValueString doubleValue];
currencyBar_heights[i] = totalValue;
currencyCategories[i] = [[appDelegate.currencies objectAtIndex:i] shortName];
}
axisEnd = findMax(currencyBar_heights, currencyCount) + ((findMax(currencyBar_heights, currencyCount)) / 10);
UIColor *colors[] = {
[UIColor colorWithRed:236/255.0 green:139/255.0 blue:34/255.0 alpha:1],
nil};
for (int i = 0; i < [appDelegate.currencies count] ; i++){
double position = i*7; //Bars will be 7 pts away from each other
double height = currencyBar_heights[i];
NSDictionary *bar = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithDouble:position],BAR_POSITION,
[NSNumber numberWithDouble:height],BAR_HEIGHT,
colors[0],COLOR,
currencyCategories[i],CATEGORY,
nil];
[self.data addObject:bar];
}
}
[self generateBarPlot];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
@end
I know theres a lot there, but I just can’t figure out for the life of me how I get this bar chart to display float values (for bar heights)? I’ve spent so much time on this now I’m starting to despair.
Does anyone know how to do this? The values that chart is receiving are definitely float values.
Any help at all would be much appreciated..
Thanks a lot,
Jack
The
bar_heightsarrays in-viewDidLoadare declared asint. Since the data values are stored here before being placed in the dictionary structure you pass to the plot datasource, any fractional part of the values gets lost.