Inherits from TKChartAxis : NSObject
Declared in TKChartDateTimeAxis.h

Overview

The date-time axis of TKChart.

The TKChartDateTimeAxis categorical axis is an axis with NSDate values sorted chronologically. It also allows definition of categories based on specific date time components – year, month, day etc. For example, if data values fall in the range of one year, the points can be plotted in categories for each month. If data values fall in the range of one month, the values can be categorized by days. It also introduces several important properties:

  • majorTickInterval - Defines an interval among major axis ticks

  • baseline - Contains a value, which defines how the series data should be aligned to. (For example: The TKChartBarSeries might render its bars up and down side depending on wether its value is greater or less than the baseline value.)

  • offset - Determines a axis value where the axis is crossed with another axis

Tasks

Properties

baseline

The value to which the series data is aligned to.

@property (nonatomic, strong) NSDate *baseline

Declared In

TKChartDateTimeAxis.h

majorTickInterval

The major tick mark frequency. The interpretation of the value for this property is determined by the majorTickIntervalUnit property.

@property (nonatomic) NSTimeInterval majorTickInterval

Declared In

TKChartDateTimeAxis.h

majorTickIntervalUnit

The major tick mark frequency using predefined values for a period.

@property (nonatomic) TKChartDateTimeAxisIntervalUnit majorTickIntervalUnit

Discussion

The date/time interval units are defined as follows:

typedef enum {
    TKChartDateTimeAxisIntervalUnitSeconds,     // The majorTickInterval is measured in seconds.
    TKChartDateTimeAxisIntervalUnitMinutes,     // The majorTickInterval is measured in minutes.
    TKChartDateTimeAxisIntervalUnitHours,       // The majorTickInterval is measured in hours.
    TKChartDateTimeAxisIntervalUnitDays,        // The majorTickInterval is measured in days.
    TKChartDateTimeAxisIntervalUnitWeeks,       // The majorTickInterval is measured in weeks.
    TKChartDateTimeAxisIntervalUnitMonths,      // The majorTickInterval is measured in months.
    TKChartDateTimeAxisIntervalUnitYears,       // The majorTickInterval is measured in years.
    TKChartDateTimeAxisIntervalUnitCustom       // The majorTickInterval is measured in ticks.
} TKChartDateTimeAxisIntervalUnit;

Declared In

TKChartDateTimeAxis.h

offset

The value where the axis will be crossed by the other.

@property (nonatomic, strong) NSDate *offset

Declared In

TKChartDateTimeAxis.h

Instance Methods

initWithMinimumDate:andMaximumDate:

Initializes a new axis with minimum and maximum date.

- (instancetype __nonnull)initWithMinimumDate:(NSDate *__nonnull)minDate andMaximumDate:(NSDate *__nonnull)maxDate

Parameters

minDate

The minimum date that specifies the start of the range.

maxDate

The maximum date that specifies the end of the rangee.

Declared In

TKChartDateTimeAxis.h

setMajorTickCount:

Sets the tick count for this axis.

- (void)setMajorTickCount:(NSInteger)tickCount

Parameters

tickCount

The number of ticks to be displayed

Declared In

TKChartDateTimeAxis.h

setPlotMode:

The plot mode of the axis.

- (void)setPlotMode:(TKChartAxisPlotMode)plotMode

Parameters

plotMode

The plot mode.

Declared In

TKChartDateTimeAxis.h