geospatialdraw
Version:
Geospatial Map Drawing Library
114 lines • 4.11 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
var turf_1 = require("@turf/turf");
var GeoJSON_1 = require("ol/format/GeoJSON");
/**
* Detects shapes of GeometryJSON objects by evaluating their geometric contents
*/
var ShapeDetector = /** @class */ (function () {
/**
* Constructs an instance of the ShapeDetector
*/
function ShapeDetector() {
this.geoFormat = new GeoJSON_1.default();
}
/**
* Gets the shape of GeometryJSON object
* @param geoJSON - GeometryJSON object
* @returns Shape of geometry
*/
ShapeDetector.prototype.shapeFromGeoJSON = function (geoJSON) {
var feature = this.geoFormat.readFeature(geoJSON);
return this.shapeFromFeature(feature);
};
/**
* Gets the shape of an Open Layers feature
* @param feature - Open Layers feature
* @returns Shape of geometry
*/
ShapeDetector.prototype.shapeFromFeature = function (feature) {
if (this.isLineFeature(feature)) {
return 'Line';
}
else if (this.isBoundingBoxFeature(feature)) {
return 'Bounding Box';
}
else if (this.isPointFeature(feature)) {
return 'Point';
}
else if (this.isPointRadiusFeature(feature)) {
return 'Point Radius';
}
else {
return 'Polygon';
}
};
/**
* Checks if feature matches shape
* @param feature - Open Layers feature
* @returns true if geometry is a line
*/
ShapeDetector.prototype.isLineFeature = function (feature) {
var _a;
return ((_a = feature.getGeometry()) === null || _a === void 0 ? void 0 : _a.getType()) === 'LineString';
};
/**
* Checks if feature matches shape
* @param feature - Open Layers feature
* @returns true if geometry is a point
*/
ShapeDetector.prototype.isPointFeature = function (feature) {
var _a;
return (((_a = feature.getGeometry()) === null || _a === void 0 ? void 0 : _a.getType()) === 'Point' &&
(feature.get('buffer') === undefined || feature.get('buffer') <= 0));
};
/**
* Checks if feature matches shape
* @param feature - Open Layers feature
* @returns true if geometry is a bounding box
*/
ShapeDetector.prototype.isBoundingBoxFeature = function (feature) {
var _a;
if (!this.isPolygonFeature(feature)) {
return false;
}
else {
var coordinates_1 = feature.getGeometry().getCoordinates()[0];
var extent = (_a = feature.getGeometry()) === null || _a === void 0 ? void 0 : _a.getExtent();
if (!extent) {
return false;
}
var expectedCoordinates = (0, turf_1.bboxPolygon)(extent).geometry
.coordinates[0];
return (coordinates_1.length === 5 &&
expectedCoordinates.every(function (expectedPoint) {
return coordinates_1.some(function (point) {
return point[0] === expectedPoint[0] && point[1] === expectedPoint[1];
});
}));
}
};
/**
* Checks if feature matches shape
* @param feature - Open Layers feature
* @returns true if geometry is a point radius
*/
ShapeDetector.prototype.isPointRadiusFeature = function (feature) {
var _a;
return (((_a = feature.getGeometry()) === null || _a === void 0 ? void 0 : _a.getType()) === 'Point' &&
feature.get('buffer') &&
feature.get('buffer') > 0);
};
/**
* Checks if feature matches shape
* @param feature - Open Layers feature
* @returns true if geometry is a polygon
*/
ShapeDetector.prototype.isPolygonFeature = function (feature) {
var _a;
return ((_a = feature.getGeometry()) === null || _a === void 0 ? void 0 : _a.getType()) === 'Polygon';
};
return ShapeDetector;
}());
exports.default = ShapeDetector;
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