Samples/Drawing Tools/Select Data in Drawn Polygon Area/Select Data in Drawn Polygon Area.html

﻿<!DOCTYPE html>
<html lang="en">
<head>
    <title>Select Data in Drawn Polygon Area - Bing Maps Samples</title>

    <meta charset="utf-8" />
	<link rel="shortcut icon" href="/favicon.ico"/>
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
    <meta name="description" content="This sample shows how to use the drawing tools to draw a polygon search area on the map and then search for all shapes on the map that are within that polygon." />
    <meta name="keywords" content="Microsoft maps, map, gis, API, SDK, Bing, Bing Maps" />
    <meta name="author" content="Microsoft Bing Maps" />
    <meta name="screenshot" content="screenshot.jpg" />
    
    <script>
    var map, tools, searchArea, pinLayer;

    function GetMap() {
        map = new Microsoft.Maps.Map('#myMap', {});

        //Add some random pushpins to a layer on the map. 
        pinLayer = new Microsoft.Maps.Layer();
        map.layers.insert(pinLayer);

        var pushpins = Microsoft.Maps.TestDataGenerator.getPushpins(30, map.getBounds(), { color: 'purple' });
        pinLayer.add(pushpins);

        for (var i = 0; i < 30; i++){
            pushpins[i].metadata = {
                id: 'pin_' + i
            };
        }

        //Load the Drawing Tools and Spatial Math modules.
        Microsoft.Maps.loadModule(['Microsoft.Maps.DrawingTools', 'Microsoft.Maps.SpatialMath'], function () {
            tools = new Microsoft.Maps.DrawingTools(map);

            //When the user presses 'esc', take the polygon out of edit mode and re-add to base map.
            document.getElementById('myMap').onkeypress = function (e) {
                if (e.charCode === 27) {
                    tools.finish(searchArea);
                }
            };

            //When ever the polygon search area has changed, a new Location added, or is editted, do a search.
            Microsoft.Maps.Events.addHandler(tools, 'drawingChanged', findIntersectingData);
        });
    }

    function drawSearchArea() {
        //Complete any current drawing and complete a search for it.
        if (searchArea) {
            tools.finish(searchArea);
            findIntersectingData(searchArea);
            searchArea = null;
        }

        //Create a new polygon.
        tools.create(Microsoft.Maps.DrawingTools.ShapeType.polygon, function (s) {
            searchArea = s;
        });
    }

    //Find all pushpins on the map that intersect with the drawn search area.
    function findIntersectingData(searchArea) {
        //Ensure that the search area is a valid polygon, should have 4 Locations in it's ring as it automatically closes.
        if (searchArea && searchArea.getLocations().length >= 4) {
            //Get all the pushpins from the pinLayer.
            var pins = pinLayer.getPrimitives();

            //Clear any previously selected data.
            for (var i = 0; i < pins.length; i++) {
                pins[i].setOptions({ color: 'purple' });
            }

            //Using spatial math find all pushpins that intersect with the drawn search area.
            //The returned data is a copy of the intersecting data and not a reference to the original shapes, 
            //so making edits to them will not cause any updates on the map.
            var intersectingPins = Microsoft.Maps.SpatialMath.Geometry.intersection(pins, searchArea);

            //The data returned by the intersection function can be null, a single shape, or an array of shapes. 
            if (intersectingPins) {
                //For ease of usem wrap individudal shapes in an array.
                if (intersectingPins && !(intersectingPins instanceof Array)) {
                    intersectingPins = [intersectingPins];
                }

                var selectedPins = [];

                //Loop through and map the intersecting pushpins back to their original pushpins by comparing their coordinates.
                for (var j = 0; j < intersectingPins.length; j++) {
                    for (var i = 0; i < pins.length; i++) {
                        if (Microsoft.Maps.Location.areEqual(pins[i].getLocation(), intersectingPins[j].getLocation())) {
                            //Set the selected pin color to red.
                            pins[i].setOptions({ color: 'red' });

                            selectedPins.push(pins[i]);
                            break;
                        }
                    }
                }

                //Return the pushpins that were selected.
                return selectedPins;
            }
        }

        return null;
    }
    </script>
    
</head>
<body>
    <div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;background-color:gray"></div>
    <input type="button" onclick="drawSearchArea()" value="Select Data" />

    <fieldset style="width:800px;margin-top:10px;">
        <legend>Select Data in Drawn Polygon Area Sample</legend>
        This sample shows how to use the drawing tools to draw a polygon search area on the map and then search for all shapes on the map that are within that polygon.
    </fieldset>

    <script>
        // Dynamic load the Bing Maps Key and Script
        // Get your own Bing Maps key at https://www.microsoft.com/maps
        (async () => {
            let script = document.createElement("script");
            let bingKey = await fetch("https://samples.azuremaps.com/api/GetBingMapsKey").then(r => r.text()).then(key => { return key });
            script.setAttribute("src", `https://www.bing.com/api/maps/mapcontrol?callback=GetMap&key=${bingKey}`);
            document.body.appendChild(script);
        })();
    </script>
</body>
</html>