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Make the resolution constraint configurable through map options

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This commit is contained in:
Éric Lemoine
2012-09-27 13:36:57 +02:00
parent 1f55d139b2
commit 87189293b5
3 changed files with 78 additions and 3 deletions
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26
src/ol/mapoptions.js
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@@ -1,3 +1,5 @@
// FIXME rotation constraint is not configurable at the moment
goog.provide('ol.MapOptions');
goog.provide('ol.MapOptionsLiteral');
goog.provide('ol.MapOptionsType');
@@ -171,9 +173,27 @@ ol.MapOptions.create = function(mapOptionsLiteral) {
* @return {ol.Constraints} Map constraints.
*/
ol.MapOptions.createConstraints_ = function(mapOptionsLiteral) {
// FIXME this should be configurable
var resolutionConstraint = ol.ResolutionConstraint.createSnapToPower(
Math.exp(Math.log(2) / 4), ol.Projection.EPSG_3857_HALF_SIZE / 128);
var resolutionConstraint;
if (goog.isDef(mapOptionsLiteral.resolutions)) {
resolutionConstraint = ol.ResolutionConstraint.createSnapToResolutions(
mapOptionsLiteral.resolutions);
} else {
var maxResolution, numZoomLevels, zoomFactor;
if (goog.isDef(mapOptionsLiteral.maxResolution) &&
goog.isDef(mapOptionsLiteral.numZoomLevels) &&
goog.isDef(mapOptionsLiteral.zoomFactor)) {
maxResolution = mapOptionsLiteral.maxResolution;
numZoomLevels = mapOptionsLiteral.numZoomLevels;
zoomFactor = mapOptionsLiteral.zoomFactor;
} else {
maxResolution = ol.Projection.EPSG_3857_HALF_SIZE / 128;
numZoomLevels = 29;
zoomFactor = Math.exp(Math.log(2) / 4);
}
resolutionConstraint = ol.ResolutionConstraint.createSnapToPower(
zoomFactor, maxResolution, numZoomLevels - 1);
}
// FIXME rotation constraint is not configurable at the moment
var rotationConstraint = ol.RotationConstraint.none;
return new ol.Constraints(resolutionConstraint, rotationConstraint);
};