# all files / ol/render/ box.js

88.89% Statements 48/54
50% Branches 3/6
85.71% Functions 6/7
88.89% Lines 48/54

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     // FIXME add rotation

    goog.provide('ol.render.Box');

    goog.require('goog.Disposable');
    goog.require('goog.asserts');
    goog.require('ol.geom.Polygon');

    /**
     * @constructor
     * @extends {goog.Disposable}
     * @param {string} className CSS class name.
     */
    ol.render.Box = function(className) {

      /**
       * @type {ol.geom.Polygon}
       * @private
       */
      this.geometry_ = null;

      /**
       * @type {HTMLDivElement}
       * @private
       */
      this.element_ = /** @type {HTMLDivElement} */ (document.createElement('div'));
      this.element_.style.position = 'absolute';
      this.element_.className = 'ol-box ' + className;

      /**
       * @private
       * @type {ol.Map}
       */
      this.map_ = null;

      /**
       * @private
       * @type {ol.Pixel}
       */
      this.startPixel_ = null;

      /**
       * @private
       * @type {ol.Pixel}
       */
      this.endPixel_ = null;

    };
    goog.inherits(ol.render.Box, goog.Disposable);

    /**
     * @inheritDoc
     */
    ol.render.Box.prototype.disposeInternal = function() {
      this.setMap(null);
      goog.base(this, 'disposeInternal');
    };

    /**
     * @private
     */
    ol.render.Box.prototype.render_ = function() {
      var startPixel = this.startPixel_;
      var endPixel = this.endPixel_;
      goog.asserts.assert(startPixel, 'this.startPixel_ must be truthy');
      goog.asserts.assert(endPixel, 'this.endPixel_ must be truthy');
      var px = 'px';
      var style = this.element_.style;
      style.left = Math.min(startPixel[0], endPixel[0]) + px;
      style.top = Math.min(startPixel[1], endPixel[1]) + px;
      style.width = Math.abs(endPixel[0] - startPixel[0]) + px;
      style.height = Math.abs(endPixel[1] - startPixel[1]) + px;
    };

    /**
     * @param {ol.Map} map Map.
     */
    ol.render.Box.prototype.setMap = function(map) {
      Iif (this.map_) {
        this.map_.getOverlayContainer().removeChild(this.element_);
        var style = this.element_.style;
        style.left = style.top = style.width = style.height = 'inherit';
      }
      this.map_ = map;
      Eif (this.map_) {
        this.map_.getOverlayContainer().appendChild(this.element_);
      }
    };

    /**
     * @param {ol.Pixel} startPixel Start pixel.
     * @param {ol.Pixel} endPixel End pixel.
     */
    ol.render.Box.prototype.setPixels = function(startPixel, endPixel) {
      this.startPixel_ = startPixel;
      this.endPixel_ = endPixel;
      this.createOrUpdateGeometry();
      this.render_();
    };

    /**
     * Creates or updates the cached geometry.
     */
    ol.render.Box.prototype.createOrUpdateGeometry = function() {
      goog.asserts.assert(this.startPixel_,
          'this.startPixel_ must be truthy');
      goog.asserts.assert(this.endPixel_,
          'this.endPixel_ must be truthy');
      goog.asserts.assert(this.map_, 'this.map_ must be truthy');
      var startPixel = this.startPixel_;
      var endPixel = this.endPixel_;
      var pixels = [
        startPixel,
        [startPixel[0], endPixel[1]],
        endPixel,
        [endPixel[0], startPixel[1]]
      ];
      var coordinates = pixels.map(this.map_.getCoordinateFromPixel, this.map_);
      // close the polygon
      coordinates[4] = coordinates[0].slice();
      Eif (!this.geometry_) {
        this.geometry_ = new ol.geom.Polygon([coordinates]);
      } else {
        this.geometry_.setCoordinates([coordinates]);
      }
    };

    /**
     * @return {ol.geom.Polygon} Geometry.
     */
    ol.render.Box.prototype.getGeometry = function() {
      return this.geometry_;
    };