Sorry, another question. Is there a way to have the graph's y-axis not start at zero? I have a data set that ranges from 20000-25000, and don't want all of the excess displayed.

NSMutableArray* chartData = [NSMutableArray arrayWithCapacity:10]; srand(time(nil)); for(int i=0;i<10;i++) { int r = (rand() + rand()) % 1000; chartData[i] = [NSNumber numberWithInt:0]; } // Creating the line chart FSLineChart* lineChart = [[FSLineChart alloc] initWithFrame:CGRectMake(20, 60, [UIScreen mainScreen].bounds.size.width - 40, 166)]; lineChart.verticalGridStep = 5; lineChart.horizontalGridStep = 9; //lineChart.fillColor = nil; lineChart.labelForIndex = ^(NSUInteger item) { return [NSString stringWithFormat:@"%lu",(unsigned long)item]; }; lineChart.labelForValue = ^(CGFloat value) { return [NSString stringWithFormat:@"%.f", value]; }; [lineChart setChartData:chartData]; return lineChart;

I replace all the data point with 0 in the example project and the app crashed. Here is the failure information:

Assertion failed: (CGFloatIsValid(x) && CGFloatIsValid(y)), function void CGPathMoveToPoint(CGMutablePathRef, const CGAffineTransform *, CGFloat, CGFloat), file Paths/CGPath.cc, line 254.

Hi there,

First of all, thank you for this great library.

I got a question about the precision of the float, when I set the CGFloat value to .4f it doesn't return the last 2 digits as seen on the screenshot, this results in 0.

Also the chart is showing almost a straight line because it doesn't measure the last 2 digits while the last two digits are very important.

self.lineChart.labelForValue = ^(CGFloat value) {
return [NSString stringWithFormat:@"€ %.4f", value];
};

Hi, does FSLineChart support reloading ( using for example NSTimer ) chart with updated data ?

More in depth: can i reload chart every seconds with new data ?

In a number of locations, calculations are done using (_data.count - 1), e.g. line 134 (https://github.com/ArthurGuibert/FSLineChart/blob/master/FSLineChart/FSLineChart/FSLineChart.m#L134).

There are a number of other locations where this assumption (_data.count > 1) is made. The crashes are happening because these calculated values end up being NaN.

In addition to empty data arrays, it looks like the code needs to safeguard against data arrays containing one value.

• (void)loadChartWithDates {

  NSArray *chartData=@[@"78",@"23"];

  NSArray* months = @[@"2016-05-23", @"2016-05-24"];

  // Setting up the line chart _chartWithDates.verticalGridStep = 6; _chartWithDates.horizontalGridStep = 3; _chartWithDates.fillColor = nil; _chartWithDates.displayDataPoint = YES; _chartWithDates.dataPointColor = [UIColor fsOrange]; _chartWithDates.dataPointBackgroundColor = [UIColor fsOrange]; _chartWithDates.dataPointRadius = 2; _chartWithDates.color = [_chartWithDates.dataPointColor colorWithAlphaComponent:0.3]; _chartWithDates.valueLabelPosition = ValueLabelLeftMirrored;

  _chartWithDates.labelForIndex = ^(NSUInteger item) { return months[item]; };

  _chartWithDates.labelForValue = ^(CGFloat value) { return [NSString stringWithFormat:@"%.f", value]; };

  [_chartWithDates setChartData:chartData]; }

if NSArray chartData=@[@"78",@"23"]; NSArray months = @[@"2016-05-23", @"2016-05-24"]; the second object 2016-05-24 can't be load ? why?

When I call the method ''clearChartData:', the chart will draw again.

The method 'drawRect:' will call to redraw.

So I can't clear the chart.

Help me, thanks.

Changing chart parameters is not possible after adding chart data. A workaround is this hack which resets the whole chart:

FSLineChart *newChart = [[FSLineChart alloc] initWithFrame:self.lineChartFull.frame];
[self.lineChartFull removeFromSuperview];
[self.view addSubview:newChart];
self.lineChartFull = newChart;

hi, the function drawGrid of FSLineChart,

since it invoke : UIGraphicsPushContext(ctx); so have to release it as follows:

//@step should be pop to release
UIGraphicsPopContext();

or else memory leak ?

Maybe not an issue, but I can't figure out how to change the background. Ideally, reduce the alpha, but I can live with setting it to black. Is there a way to do that?

Need

- (void)awakeFromNib
{
    self.backgroundColor = [UIColor whiteColor];
    [self setDefaultParameters];
}

In FSLineChart.m in order to set up defaults.

I want to set a different values value for x-axis which may not be present in the x-axis value array. Example : I want to set 1500 as my total distance and I may get y values till 120 in my x-axis value array. How to set a max value for x axis?

Hello, I would like to present on the graph the value of each specific point that I plot. Is there any way to do this? Maybe showing a label on top of each point with its value, or, on the Y-axis, instead of presenting a series of steps, is there any way to show the value of the point? Do you understand what I mean? Thank you in advance for your help, and @ArthurGuibert, Thank you for the framework! It is great!

See image, why am I getting this behaviour when it goes up 10?

See my code below:

float n = [[sort objectAtIndex:0] floatValue];
        
        NSString* forFloat = [NSString stringWithFormat:@"%.3f", n];
        lowFloat = [forFloat floatValue]-0.001;

NSMutableArray* chartData = [NSMutableArray arrayWithCapacity:self.lineData.count];
            NSMutableArray* months = [NSMutableArray arrayWithCapacity:self.lineData.count];
            for(int i=0;i<self.lineData.count;i++) {
                
                Kobject *z = [self.lineData objectAtIndex:i];
                chartData[i] = [NSNumber numberWithFloat:[z.oPrice floatValue]-lowFloat];
                months[i] = z.oDate;
            }
            
            self.lineChart = [[FSLineChart alloc] initWithFrame:CGRectMake(15, 44, [UIScreen mainScreen].bounds.size.width - 30, 120)];
            self.lineChart.verticalGridStep = 6;
            self.lineChart.horizontalGridStep = 7;
            self.lineChart.fillColor = [UIColor colorWithRed:0.24 green:0.72 blue:0.68 alpha:0.20];
            self.lineChart.color = [self.lineChart.dataPointColor colorWithAlphaComponent:0.3];
            self.lineChart.valueLabelPosition = ValueLabelLeftMirrored;
            self.lineChart.indexLabelFont = [UIFont fontWithName:@"HelveticaNeue-Light" size:10];
            self.lineChart.valueLabelFont = [UIFont fontWithName:@"HelveticaNeue-Light" size:9];
            self.lineChart.labelForIndex = ^(NSUInteger item) {
                return months[item];
            };
            self.lineChart.labelForValue = ^(CGFloat value) {
                
                return [NSString stringWithFormat:@"$ %.2f", value+lowFloat];
            };
            [self.lineChart setChartData:chartData];
            [view addSubview:self.lineChart];