Samples/Spatial Math/Cardinal Spline Features/Cardinal Spline Features.html

﻿<!DOCTYPE html>
<html lang="en">
<head>
    <title>Cardinal Spline Features - 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 provides a set of controls to test the various features of the Cardinal Spline function." />
    <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, pins, straightLine, curvedLine;

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

        //Load the Spatial Math module.
        Microsoft.Maps.loadModule('Microsoft.Maps.SpatialMath', function () {
            //Generate some random pushpins on the map that are draggable.
            pins = Microsoft.Maps.TestDataGenerator.getPushpins(5, map.getBounds(), { draggable: true });

            for (var i = 0; i < pins.length; i++) {
                //When the pushpins are dragged, fire an event.
                Microsoft.Maps.Events.addHandler(pins[i], 'drag', pushpinDragged);
            }

            map.entities.push(pins);

            //Fire the pushpin drag event to initialize the cardinal spline.
            pushpinDragged();
        });
    }

    function pushpinDragged() {
        var locs = [];

        //Extract the locations from the pushpins.
        for (var i = 0; i < pins.length; i++) {
            locs.push(pins[i].getLocation());
        }

        //Create a straight red line through the locations for comparison.
        if (!straightLine) {
            straightLine = new Microsoft.Maps.Polyline(locs, { strokeThickness: 3, strokeColor: 'red' });
            map.entities.push(straightLine);
        } else {
            straightLine.setLocations(locs);
        }

        //Calculate a cardinal spline. 
        calculateSpline();
    }

    function calculateSpline() {
        //Get the spline options.
        var tension = parseFloat(document.getElementById("tensionSlider").value);
        var nodeSize = parseInt(document.getElementById("nodeSizeSlider").value);
        var close = document.getElementById("closeChbx").checked;

        document.getElementById("tensionVal").innerHTML = tension;
        document.getElementById("nodeSizeVal").innerHTML = nodeSize;

        //Get the test locations from the straight line.
        var locs = Microsoft.Maps.SpatialMath.getCardinalSpline(straightLine.getLocations(), tension, nodeSize, close);

        //Create a cardinal spline on the map as a polyline. 
        if (!curvedLine) {
            curvedLine = new Microsoft.Maps.Polyline(locs, { strokeThickness: 3 });
            map.entities.push(curvedLine);
        } else {
            curvedLine.setLocations(locs);
        }
    }
    </script>
    
    <style>
        input[type=range] {
            padding: 10px;
        }
    </style>
</head>
<body>
    <div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;background-color:gray"></div><br />
    Tension: <input id="tensionSlider" type="range" min="-2" max="2" step="0.1" value="0.5" onchange="calculateSpline()" /> <span id="tensionVal"></span><br />
    Node Size: <input id="nodeSizeSlider" type="range" min="2" max="50" step="1" value="30" onchange="calculateSpline()" /> <span id="nodeSizeVal"></span><br />
    Close: <input id="closeChbx" type="checkbox" onchange="calculateSpline()" />

    <fieldset style="width:800px;margin-top:10px;">
        <legend>Cardinal Spline Features Sample</legend>
        This sample shows provides a set of controls to test the various features of the Cardinal Spline function. 
        Drag the pushpins, change the tension and node size using the sliders, or make the cardinal spline a closed shape.
    </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>