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Adjust resolution for user extent

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This commit is contained in:
Andreas Hocevar
2021-09-10 01:36:33 +02:00
parent d7f7cbbc75
commit c9593b0cf6
4 changed files with 77 additions and 4 deletions
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38
src/ol/proj.js
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@@ -631,6 +631,44 @@ export function fromUserExtent(extent, destProjection) {
return transformExtent(extent, userProjection, destProjection);
}
/**
* Return the resolution in user projection units per pixel. If no user projection
* is set, or source or user projection are missing units, the original resolution
* is returned.
* @param {number} resolution Resolution in input projection units per pixel.
* @param {ProjectionLike} sourceProjection The input projection.
* @return {number} Resolution in user projection units per pixel.
*/
export function toUserResolution(resolution, sourceProjection) {
if (!userProjection) {
return resolution;
}
const sourceUnits = get(sourceProjection).getUnits();
const userUnits = userProjection.getUnits();
return sourceUnits && userUnits
? (resolution * METERS_PER_UNIT[sourceUnits]) / METERS_PER_UNIT[userUnits]
: resolution;
}
/**
* Return the resolution in user projection units per pixel. If no user projection
* is set, or source or user projection are missing units, the original resolution
* is returned.
* @param {number} resolution Resolution in user projection units per pixel.
* @param {ProjectionLike} destProjection The destination projection.
* @return {number} Resolution in destination projection units per pixel.
*/
export function fromUserResolution(resolution, destProjection) {
if (!userProjection) {
return resolution;
}
const sourceUnits = get(destProjection).getUnits();
const userUnits = userProjection.getUnits();
return sourceUnits && userUnits
? (resolution * METERS_PER_UNIT[userUnits]) / METERS_PER_UNIT[sourceUnits]
: resolution;
}
/**
* Creates a safe coordinate transform function from a coordinate transform function.
* "Safe" means that it can handle wrapping of x-coordinates for global projections,