Drawing intervals

To improve visualizing multiple Period or Sequence instances you can use the provided charting feature.

The feature is introduced in version 4.10.

Generating a simple graph.

To generate a graph you need to give to the Dataset constructor a list of pairs. Each pair is an array containing 2 values:


use League\Period\Chart\Dataset;
use League\Period\Chart\GanttChart;
use League\Period\Period;
use League\Period\Sequence;

$dataset = new Dataset([
    ['period', new Period('2018-01-01', '2018-02-01')],
    ['sequence', new Sequence(
        new Period('2018-01-15', '2018-01-18'),
        new Period('2018-01-20', '2018-02-01')
(new GanttChart())->stroke($dataset);


 period   [----------------------------------------------------------)
 sequence                            [----)   [----------------------)

Appending items to display

If you want to display a Sequence and some of its operations. You can append the operation result using the Dataset::append method.


use League\Period\Chart\Dataset;
use League\Period\Chart\GanttChart;
use League\Period\Period;
use League\Period\Sequence;

$sequence = new Sequence(
    new Period('2018-01-01', '2018-03-01'),
    new Period('2018-05-01', '2018-08-01')
$dataset = new Dataset();
$dataset->append('A', $sequence[0]);
$dataset->append('B', $sequence[1]);
$dataset->append('GAPS', $sequence->gaps());
(new GanttChart())->stroke($dataset);


 A    [-------------)                                                         
 B                               [----------------)
 GAPS               [------------)    

The Dataset implements the Countable and the IteratorAggregate interface. It also exposes the following methods:

public function Dataset::fromItems($items, ?LabelGenerator $labelGenerator = null): self; //Creates a new Dataset from a collection of Sequence/Periods and a LabelGenerator.
public function Dataset::fromIterable(iterable $iterable): self; //Creates a new Dataset from a generic iterable structure of Sequence/Periods.
public function Dataset::appendAll(iterable $pairs): void; //adds multiple pairs at once.
public function Dataset::isEmpty(): bool; //Tells whether the collection is empty.
public function Dataset::labels(): string[]; //the current labels used
public function Dataset::items(): Sequence[]; //the current objects inside the Dataset
public function Dataset::boundaries(): ?Period;  //Returns the collection boundaries or null if it is empty.
public function Dataset::labelMaxLength(): int;  //Returns the label max length.

Displaying the Dataset

The GanttChart class is responsible for generating the graph from the Dataset by implementing the Graph interface for the console.

The GanttChart::stroke methods expects a Dataset object as its unique argument.

If you wish to present the graph on another medium like a web browser or an image, you will need to implement the interface for your implementation.


use League\Period\Chart\Dataset;
use League\Period\Chart\GanttChart;
use League\Period\Period;

$graph = new GanttChart();
$graph->stroke(new Dataset([
    ['first', new Period('2018-01-01 08:00:00', '2018-01-01 12:00:00')],
    ['last', new Period('2018-01-01 10:00:00', '2018-01-01 14:00:00')],


 first [---------------------------)
 last            [------------------------------)

Customizing the graph looks

The GanttChart class can be customized by providing a GanttChartConfig which defines:

You can easily create a Output implementing class with libraries like League CLImate or Symfony Console to output the resulting graph. If you don’t, the package ships with a minimal ConsoleOutput class which is used if you do not provide you own implementation.

The GanttChartConfig class exposes the following additional constants and methods:

const GanttChartConfig::ALIGN_LEFT = 1;
const GanttChartConfig::ALIGN_RIGHT = 0;
const GanttChartConfig::ALIGN_CENTER = 2;
public function GanttChartConfig::__construct(Output $output);
public function GanttChartConfig::output(): Output;        //Returns the Output instance.
public function GanttChartConfig::startExcluded(): string; //Retrieves the excluded start block character.
public function GanttChartConfig::startIncluded(): string; //Retrieves the included start block character.
public function GanttChartConfig::endExcluded(): string;   //Retrieves the excluded end block character.
public function GanttChartConfig::endIncluded(): string;   //Retrieves the included end block character.
public function GanttChartConfig::width(): int;            //Retrieves the max size width.
public function GanttChartConfig::body(): string;          //Retrieves the body block character.
public function GanttChartConfig::space(): string;         //Retrieves the space block character.
public function GanttChartConfig::colors(): string[];      //The selected colors for each row.
public function GanttChartConfig::gapSize(): int;          //Retrieves the gap sequence between the label and the line.
public function GanttChartConfig::labelAlign(): int;       //Returns how label should be aligned.
public function GanttChartConfig::leftMarginSize(): int;   //Retrieves the margin between the label and the console left side.

GanttChartConfig is immutable, modifying its properties returns a new instance with the updated values.

Here’s a complex example which highlights most of the features introduces along visualizing Period and Sequance instances:


use League\Period\Chart\AffixLabel;
use League\Period\Chart\ConsoleOutput;
use League\Period\Chart\Dataset;
use League\Period\Chart\DecimalNumber;
use League\Period\Chart\GanttChart;
use League\Period\Chart\GanttChartConfig;
use League\Period\Chart\ReverseLabel;
use League\Period\Chart\RomanNumber;
use League\Period\Datepoint;
use League\Period\Period;
use League\Period\Sequence;

$config = GanttChartConfig::createFromRainbow()
    ->withOutput(new ConsoleOutput(STDOUT))

$labelGenerator = new DecimalNumber(42);
$labelGenerator = new RomanNumber($labelGenerator, RomanNumber::UPPER);
$labelGenerator = new AffixLabel($labelGenerator, '', '.');
$labelGenerator = new ReverseLabel($labelGenerator);

$sequence = new Sequence(
    Datepoint::create('2018-05-29')->getMonth()->expand('3 MONTH'),
    Period::around('2016-06-01', '3 MONTHS', Period::INCLUDE_ALL)
$dataset = Dataset::fromItems($sequence, $labelGenerator);
$dataset->append($labelGenerator->format('gaps'), $sequence->gaps());
$graph = new GanttChart($config);

which will output in your console:

   XLV.  πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ•πŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ”
  XLIV.  πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ…πŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸŽΎπŸ’©πŸ’©πŸ’©
 XLIII.  πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ•πŸ˜ŠπŸ˜ŠπŸŽΎπŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©
  XLII.  πŸ…πŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ”πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©
  GAPS.  πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ•πŸ˜ŠπŸ˜ŠπŸ”πŸ’©πŸ’©πŸ…πŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ˜ŠπŸ”πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©πŸ’©

On a POSIX compliant console all lines have different colors