openlayers
Version:
Build tools and sources for developing OpenLayers based mapping applications
133 lines (110 loc) • 2.78 kB
JavaScript
// FIXME add rotation
goog.provide('ol.render.Box');
goog.require('ol');
goog.require('ol.Disposable');
goog.require('ol.geom.Polygon');
/**
* @constructor
* @extends {ol.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;
};
ol.inherits(ol.render.Box, ol.Disposable);
/**
* @inheritDoc
*/
ol.render.Box.prototype.disposeInternal = function() {
this.setMap(null);
};
/**
* @private
*/
ol.render.Box.prototype.render_ = function() {
var startPixel = this.startPixel_;
var endPixel = this.endPixel_;
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) {
if (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;
if (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() {
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();
if (!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_;
};