Merge pull request #835 from elemoine/setzoom

Add ol.View2D.prototype.setZoom

src/ol/resolutionconstraint.js

@@ -11,33 +11,6 @@ goog.require('ol.array');
 ol.ResolutionConstraintType;
 
 
-/**
- * @param {number} power Power.
- * @param {number} maxResolution Maximum resolution.
- * @param {number=} opt_minResolution Minimum resolution.
- * @return {ol.ResolutionConstraintType} Zoom function.
- */
-ol.ResolutionConstraint.createContinuous =
-    function(power, maxResolution, opt_minResolution) {
-  var minResolution = opt_minResolution || 0;
-  return (
-      /**
-       * @param {number|undefined} resolution Resolution.
-       * @param {number} delta Delta.
-       * @param {number} direction Direction.
-       * @return {number|undefined} Resolution.
-       */
-      function(resolution, delta, direction) {
-        if (goog.isDef(resolution)) {
-          resolution /= Math.pow(power, delta);
-          return goog.math.clamp(resolution, minResolution, maxResolution);
-        } else {
-          return undefined;
-        }
-      });
-};
-
-
 /**
  * @param {Array.<number>} resolutions Resolutions.
  * @return {ol.ResolutionConstraintType} Zoom function.

src/ol/view2d.exports

@@ -4,3 +4,4 @@
 @exportProperty ol.View2D.prototype.constrainRotation
 @exportProperty ol.View2D.prototype.fitExtent
 @exportProperty ol.View2D.prototype.getView2D
+@exportProperty ol.View2D.prototype.setZoom

src/ol/view2d.js

@@ -59,21 +59,22 @@ ol.View2D = function(opt_options) {
   values[ol.View2DProperty.PROJECTION] = ol.proj.createProjection(
       options.projection, 'EPSG:3857');
 
-  var parts = ol.View2D.createResolutionConstraint_(options);
+  var resolutionConstraintInfo = ol.View2D.createResolutionConstraint_(
+      options);
 
   /**
    * @private
    * @type {number}
    */
-  this.maxResolution_ = parts[1];
+  this.maxResolution_ = resolutionConstraintInfo.maxResolution;
 
   /**
    * @private
    * @type {number}
    */
-  this.minResolution_ = parts[2];
+  this.minResolution_ = resolutionConstraintInfo.minResolution;
 
-  var resolutionConstraint = parts[0];
+  var resolutionConstraint = resolutionConstraintInfo.constraint;
   var rotationConstraint = ol.View2D.createRotationConstraint_(options);
 
   /**
@@ -86,7 +87,7 @@ ol.View2D = function(opt_options) {
   if (goog.isDef(options.resolution)) {
     values[ol.View2DProperty.RESOLUTION] = options.resolution;
   } else if (goog.isDef(options.zoom)) {
-    values[ol.View2DProperty.RESOLUTION] = resolutionConstraint(
+    values[ol.View2DProperty.RESOLUTION] = this.constrainResolution(
         this.maxResolution_, options.zoom);
   }
   values[ol.View2DProperty.ROTATION] =
@@ -398,11 +399,21 @@ goog.exportProperty(
     ol.View2D.prototype.setRotation);
 
 
+/**
+ * Zoom to a specific zoom level.
+ * @param {number} zoom Zoom level.
+ */
+ol.View2D.prototype.setZoom = function(zoom) {
+  var resolution = this.constrainResolution(this.maxResolution_, zoom, 0);
+  this.setResolution(resolution);
+};
+
+
 /**
  * @private
  * @param {ol.View2DOptions} options View2D options.
- * @return {Array} Array of three elements: the resolution constraint,
- *     maxResolution, and minResolution.
+ * @return {{constraint: ol.ResolutionConstraintType, maxResolution: number,
+ *     minResolution: number}}
  */
 ol.View2D.createResolutionConstraint_ = function(options) {
   var resolutionConstraint;
@@ -440,7 +451,8 @@ ol.View2D.createResolutionConstraint_ = function(options) {
     resolutionConstraint = ol.ResolutionConstraint.createSnapToPower(
         zoomFactor, maxResolution, maxZoom);
   }
-  return [resolutionConstraint, maxResolution, minResolution];
+  return {constraint: resolutionConstraint, maxResolution: maxResolution,
+    minResolution: minResolution};
 };
 
 

test/spec/ol/view2d.test.js

@@ -8,7 +8,7 @@ describe('ol.View2D', function() {
       describe('with no options', function() {
         it('gives a correct resolution constraint function', function() {
           var options = {};
-          var fn = ol.View2D.createResolutionConstraint_(options)[0];
+          var fn = ol.View2D.createResolutionConstraint_(options).constraint;
           expect(fn(156543.03392804097, 0, 0))
               .to.roughlyEqual(156543.03392804097, 1e-9);
           expect(fn(78271.51696402048, 0, 0))
@@ -24,12 +24,12 @@ describe('ol.View2D', function() {
                 maxZoom: 3,
                 zoomFactor: 3
               };
-              var parts = ol.View2D.createResolutionConstraint_(options);
-              var maxResolution = parts[1];
+              var info = ol.View2D.createResolutionConstraint_(options);
+              var maxResolution = info.maxResolution;
               expect(maxResolution).to.eql(81);
-              var minResolution = parts[2];
+              var minResolution = info.minResolution;
               expect(minResolution).to.eql(3);
-              var fn = parts[0];
+              var fn = info.constraint;
               expect(fn(82, 0, 0)).to.eql(81);
               expect(fn(81, 0, 0)).to.eql(81);
               expect(fn(27, 0, 0)).to.eql(27);
@@ -44,12 +44,12 @@ describe('ol.View2D', function() {
           var options = {
             resolutions: [97, 76, 65, 54, 0.45]
           };
-          var parts = ol.View2D.createResolutionConstraint_(options);
-          var maxResolution = parts[1];
+          var info = ol.View2D.createResolutionConstraint_(options);
+          var maxResolution = info.maxResolution;
           expect(maxResolution).to.eql(97);
-          var minResolution = parts[2];
+          var minResolution = info.minResolution;
           expect(minResolution).to.eql(0.45);
-          var fn = parts[0];
+          var fn = info.constraint;
           expect(fn(97, 0, 0)).to.eql(97);
           expect(fn(76, 0, 0)).to.eql(76);
           expect(fn(65, 0, 0)).to.eql(65);