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Refactor tile functions

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* Add support for minZoom in XYZ tile grids and tile sources
* Factor out common tile coordinate transforms
This commit is contained in:
Tom Payne
2013-04-29 17:15:33 +02:00
parent 2447f09128
commit 6976fd96e3
8 changed files with 133 additions and 131 deletions
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14
src/ol/tileurlfunction.js
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@@ -8,8 +8,7 @@ goog.require('ol.extent');
/**
* @typedef {function(this:ol.source.ImageTileSource, ol.TileCoord,
* ol.Projection): (string|undefined)}
* @typedef {function(ol.TileCoord, ol.Projection): (string|undefined)}
*/
ol.TileUrlFunctionType;
@@ -98,19 +97,22 @@ ol.TileUrlFunction.nullTileUrlFunction = function(tileCoord, projection) {
/**
* @param {function(this:ol.source.ImageTileSource, ol.TileCoord,
* ol.Projection) : ol.TileCoord} transformFn Transform function.
* @param {function(ol.TileCoord, ol.Projection, ol.TileCoord=): ol.TileCoord}
* transformFn Transform function.
* @param {ol.TileUrlFunctionType} tileUrlFunction Tile URL function.
* @return {ol.TileUrlFunctionType} Tile URL function.
*/
ol.TileUrlFunction.withTileCoordTransform =
function(transformFn, tileUrlFunction) {
var tmpTileCoord = new ol.TileCoord(0, 0, 0);
return function(tileCoord, projection) {
if (goog.isNull(tileCoord)) {
return undefined;
} else {
return tileUrlFunction.call(this,
transformFn.call(this, tileCoord, projection), projection);
return tileUrlFunction.call(
this,
transformFn.call(this, tileCoord, projection, tmpTileCoord),
projection);
}
};
};