LineString

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Next version — This documentation describes a major version that is not yet the current stable release of spatial-types.

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What is a LineString?

A LineString is an ordered sequence of points joined by straight segments. Each consecutive pair of points defines one segment.

LineString — Supported representations

Availability in the current version of Spatial Types:

Coordinate layout	Geometry Mutable	Geometry Immutable	Geography Mutable	Geography Immutable
XY	✅	✅	✅	✅
XYZ	✅	✅	✅	✅
XYM	✅	✅	✅	✅
XYZM	✅	✅	✅	✅

Creating the illustrated objects

The examples recreate the labelled objects above using Geometry in XY. Composer’s autoloader must already be loaded. Variable names match the point letters in the illustration.

Immutable objects

<?php

use LongitudeOne\SpatialTypes\Types\Dimension2\Geometry\PointImmutable;
use LongitudeOne\SpatialTypes\Types\Dimension2\Geometry\LineStringImmutable;

// Immutable objects must be fully initialized through their constructors.

$a = new PointImmutable(6.5, 8);
$b = new PointImmutable(27.5, 18.5);
$c = new PointImmutable(43, 8);
$d = new PointImmutable(50.5, 19);
$e = new PointImmutable(59, 10);
$f = new PointImmutable(68.5, 19.5);

$segment = new LineStringImmutable([$a, $b]);
$line = new LineStringImmutable([$c, $d, $e, $f]);

Mutable objects

<?php

use LongitudeOne\SpatialTypes\Types\Dimension2\Point;
use LongitudeOne\SpatialTypes\Types\Dimension2\LineString;

$a = new Point(6.5, 8);
$b = new Point(27.5, 18.5);
$c = new Point(43, 8);
$d = new Point(50.5, 19);
$e = new Point(59, 10);
$f = new Point(68.5, 19.5);

// Using the constructor.
$segment = new LineString([$a, $b]);

// Starting empty and adding points with methods.
$line = new LineString([])
    ->addPoint($c)
    ->addPoint($d)
    ->addPoint($e)
    ->addPoint($f);