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Add util functions to convert from/between Mapbox zoom levels & Mapkit camera distance #29092

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merged 3 commits into from
Feb 22, 2023
Merged

Add util functions to convert from/between Mapbox zoom levels & Mapkit camera distance #29092

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d80973c
Add helper functions to convert from & to zoom level
TimBroddin Feb 22, 2023
8269360
Add helper functions to convert from & to zoom level
TimBroddin Feb 22, 2023
5e6cf97
Simplified convertCameraDistanceToZoomLevel
TimBroddin Feb 22, 2023
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4 changes: 4 additions & 0 deletions projects/plugins/jetpack/changelog/add-map-block-mapkit-zoom-conversion
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Original file line number Diff line number Diff line change
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Significance: minor
Type: other

Adds util functions for mapkit that allow converting zoom levels to camera distance, and back
17 changes: 17 additions & 0 deletions projects/plugins/jetpack/extensions/blocks/map/mapkit-utils/index.js
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const earthRadius = 6.371e6;

function getMetersPerPixel( latitude ) {
return Math.abs( ( earthRadius * Math.cos( ( latitude * Math.PI ) / 180 ) * 2 * Math.PI ) / 256 );
}

function convertZoomLevelToCameraDistance( zoomLevel, latitude ) {
const altitude = ( 512 / Math.pow( 2, zoomLevel ) ) * 0.5; // altitude in pixels
return altitude * getMetersPerPixel( latitude );
}

function convertCameraDistanceToZoomLevel( cameraDistance, latitude ) {
const altitude = cameraDistance / getMetersPerPixel( latitude );
return Math.log2( 512 / ( altitude / 0.5 ) );
}

export { convertZoomLevelToCameraDistance, convertCameraDistanceToZoomLevel };