Vector Map - Custom Annotations

Annotations are containers for images, text blocks, and custom content. By using annotations, you can display additional information to your end users and improve the readability of data visualized within your app.

To create annotations, populate the VectorMap's annotations array. Each object in the array configures an individual annotation. To specify settings for all annotations, use the commonAnnotationSettings object. Individual settings take precedence over common settings.

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Backend API

@model IEnumerable<DevExtreme.NETCore.Demos.Models.StateData> @(Html.DevExtreme().VectorMap() .ID("vector-map") .Bounds(new double[] { -118, 55, -80, 23 }) .Layers(l => { l.Add().DataSource(new JS("DevExpress.viz.map.sources.usa")); }) .CommonAnnotationSettings(c => c.Type(AnnotationType.Custom) .Template(@<text> <svg class='annotation'> <image href="<%-getImagePath(data)%>" width="60" height="40" /> <rect class="border" x="0" y="0" /> <text x="70" y="25" class="state"><%- data.Name %></text> <text x="0" y="60"> <tspan class="caption">Capital:</tspan><tspan class="capital" dx="5"><%- data.Capital %></tspan><tspan dy="14" x="0" class="caption">Population:</tspan><tspan class="population" dx="5"><%- formatNumber(data.Population) %></tspan><tspan dy="14" x="0" class="caption">Area:</tspan><tspan class="area" dx="5"><%- formatNumber(data.Area) %></tspan><tspan dx="5">km</tspan><tspan class="sup" dy="-2">2</tspan> </text> </svg> </text>)) .Annotations(a => { foreach (var state in Model) { if (state.OffsetX.HasValue && state.OffsetY.HasValue) { a.Add().Coordinates(state.Coordinates) .Data(state.Data) .OffsetX(state.OffsetX.Value) .OffsetY(state.OffsetY.Value); } else { a.Add().Coordinates(state.Coordinates) .Data(state.Data); } } }) ) <script> var formatNumber = new Intl.NumberFormat("en-US", { maximumFractionDigits: 0 }).format; function getImagePath(data) { return '../../images/flags/' + data.Name.replace(/\s/, "") + ".svg" } </script>

using Microsoft.AspNetCore.Mvc; using DevExtreme.NETCore.Demos.Models.SampleData; namespace DevExtreme.NETCore.Demos.Controllers { public class VectorMapController : Controller { public ActionResult CustomAnnotations() { return View(SampleData.StatesData); } } }

using System; namespace DevExtreme.NETCore.Demos.Models { public class StateData { public double[] Coordinates { get; set; } public double? OffsetX { get; set; } public double? OffsetY { get; set; } public object Data { get; set; } } }

using System.Collections.Generic; namespace DevExtreme.NETCore.Demos.Models.SampleData { public partial class SampleData { public static readonly IEnumerable<StateData> StatesData = new[] { new StateData { Coordinates = new double[] {-75.4999, 43.00035}, Data = new {Name = "New York", Population = 19746227, Capital = "Albany", Area = 141297} }, new StateData { Coordinates = new double[] {-89, 40}, OffsetX = -100, OffsetY = -80, Data = new {Name = "Illinois", Population = 12880580, Capital = "Springfield", Area = 149995} }, new StateData { Coordinates = new double[] {-81.760254, 27.994402}, Data = new {Name = "Florida", Population = 19893297, Capital = "Tallahassee", Area = 170312} }, new StateData { Coordinates = new double[] {-100, 31}, Data = new {Name = "Texas", Population = 26956958, Capital = "Austin", Area = 695662} }, new StateData { Coordinates = new double[] {-119.417931, 36.778259}, Data = new {Name = "California", Population = 38802500, Capital = "Sacramento", Area = 423967} } }; } }

#vector-map { height: 440px; } .annotation { font-size: 12px; } .border { width: 60px; height: 40px; stroke: rgba(191, 191, 191, 0.25); stroke-width: 1px; fill: transparent; } .state { font-weight: 500; font-size: 14px; } .caption { font-weight: 500; } .sup { font-size: 0.8em; }

You can set each annotation type property to "text", "image", or "custom". In this demo, annotation type has been set to "custom".

Custom annotations require that you specify your own display template in SVG format. As you can see in the demo code, you can access annotation data within template markup.

For more information on annotation settings, refer to the annotations[] help topic.