openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
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JavaScript
goog.provide('ol.interaction.DragZoom');
goog.require('ol');
goog.require('ol.easing');
goog.require('ol.events.condition');
goog.require('ol.extent');
goog.require('ol.interaction.DragBox');
/**
* @classdesc
* Allows the user to zoom the map by clicking and dragging on the map,
* normally combined with an {@link ol.events.condition} that limits
* it to when a key, shift by default, is held down.
*
* To change the style of the box, use CSS and the `.ol-dragzoom` selector, or
* your custom one configured with `className`.
*
* @constructor
* @extends {ol.interaction.DragBox}
* @param {olx.interaction.DragZoomOptions=} opt_options Options.
* @api stable
*/
ol.interaction.DragZoom = function(opt_options) {
var options = opt_options ? opt_options : {};
var condition = options.condition ?
options.condition : ol.events.condition.shiftKeyOnly;
/**
* @private
* @type {number}
*/
this.duration_ = options.duration !== undefined ? options.duration : 200;
/**
* @private
* @type {boolean}
*/
this.out_ = options.out !== undefined ? options.out : false;
ol.interaction.DragBox.call(this, {
condition: condition,
className: options.className || 'ol-dragzoom'
});
};
ol.inherits(ol.interaction.DragZoom, ol.interaction.DragBox);
/**
* @inheritDoc
*/
ol.interaction.DragZoom.prototype.onBoxEnd = function() {
var map = this.getMap();
var view = /** @type {!ol.View} */ (map.getView());
var size = /** @type {!ol.Size} */ (map.getSize());
var extent = this.getGeometry().getExtent();
if (this.out_) {
var mapExtent = view.calculateExtent(size);
var boxPixelExtent = ol.extent.createOrUpdateFromCoordinates([
map.getPixelFromCoordinate(ol.extent.getBottomLeft(extent)),
map.getPixelFromCoordinate(ol.extent.getTopRight(extent))]);
var factor = view.getResolutionForExtent(boxPixelExtent, size);
ol.extent.scaleFromCenter(mapExtent, 1 / factor);
extent = mapExtent;
}
var resolution = view.constrainResolution(
view.getResolutionForExtent(extent, size));
view.animate({
resolution: resolution,
center: ol.extent.getCenter(extent),
duration: this.duration_,
easing: ol.easing.easeOut
});
};