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Avoid extra extent width calculation

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This commit is contained in:
Andreas Hocevar
2020-06-26 17:26:41 +02:00
parent 39f4627b8c
commit fef349120b
1 changed files with 16 additions and 7 deletions
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23
src/ol/coordinate.js
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@@ -406,26 +406,35 @@ export function toStringXY(coordinate, opt_fractionDigits) {
* exclusive.
*
* @param {Coordinate} coordinate Coordinate.
* @param {import("./proj/Projection.js").default} projection Projection
* @param {import("./proj/Projection.js").default} projection Projection.
* @return {Coordinate} The coordinate within the real world extent.
*/
export function wrapX(coordinate, projection) {
const worldsAway = getWorldsAway(coordinate, projection);
const worldWidth = getWidth(projection.getExtent());
const worldsAway = getWorldsAway(coordinate, projection, worldWidth);
if (worldsAway) {
coordinate[0] -= worldsAway * getWidth(projection.getExtent());
coordinate[0] -= worldsAway * worldWidth;
}
return coordinate;
}
export function getWorldsAway(coordinate, projection) {
/**
* @param {Coordinate} coordinate Coordinate.
* @param {import("./proj/Projection.js").default} projection Projection.
* @param {number=} opt_sourceExtentWidth Width of the source extent.
* @return {number} Offset in world widths.
*/
export function getWorldsAway(coordinate, projection, opt_sourceExtentWidth) {
const projectionExtent = projection.getExtent();
let worldsAway = 0;
if (
projection.canWrapX() &&
(coordinate[0] < projectionExtent[0] || coordinate[0] > projectionExtent[2])
) {
const worldWidth = getWidth(projectionExtent);
worldsAway = Math.floor((coordinate[0] - projectionExtent[0]) / worldWidth);
const sourceExtentWidth =
opt_sourceExtentWidth || getWidth(projectionExtent);
worldsAway = Math.floor(
(coordinate[0] - projectionExtent[0]) / sourceExtentWidth
);
}
return worldsAway;
}