Add Lines and markers to the map on the fly with PHP - Interactive Geo Maps

filter.php

<?php

add_filter( 'igm_add_meta', 'igm_lines_on_the_fly', 1 );
function igm_lines_on_the_fly( $meta ){

	// point 1
	$lat01 = floatval( '-7.508726' );
	$lon01 = floatval( '-36.119106' );

	// point 2
	$lat02 = floatval('40.833240' );
	$lon02 = floatval('-8.231797' );


	// add markers
	if( empty( $meta['roundMarkers'] ) ){
		$meta['roundMarkers'] = [];
	}

	// add first marker
	$meta['roundMarkers'][] = [
		'id'             => 'MyMaker01',
		'latitude'       => $lat01,
		'longitude'      => $lon01,
		'tooltipContent' => 'Tooltip for marker 01',
		'useDefaults'    => '1',
	];

	// add second marker
	$meta['roundMarkers'][] = [
		'id'             => 'MyMaker01',
		'latitude'       => $lat02,
		'longitude'      => $lon02,
		'tooltipContent' => 'Tooltip for marker 02',
		'useDefaults'    => '1',
	];

	// add the line connecting the markers
	if( empty( $meta['lines'] ) ){
		$meta['lines'] = [];
	}

	$meta['lines'][] = [
		'title'          => 'myLine',
		'multiGeoLine'   => [
			[
				'latitude'       => $lat01,
				'longitude'      => $lon01,
			],
			[
				'latitude'       => $lat02,
				'longitude'      => $lon02,
			],
			
		],
		'useDefaults'    => '1',
	];

	return $meta;
}