ImageTileDataProvider Class

Provides the map with image tiles.

Assembly: DevExpress.Xpf.Map.v20.1.dll

Declaration

C#
VB.NET

public class ImageTileDataProvider :
    MapTileDataProviderBase

Public Class ImageTileDataProvider
    Inherits MapTileDataProviderBase

Remarks

This provider allows you to load image tiles created at runtime from almost any source.

To use the Image Tile Data Provider, assign a ImageTileDataProvider object to the ImageLayer.DataProvider property.

Specify the TileSource property to configure the provider's image tile source.

Examples

This example shows how to use an ImageTileDataProvider instance to generate map tiles.

Create an ImageTileDataProvider object and assign it to the ImageLayer.DataProvider property.
Create a class that inherits the ImageTileSource class.
Implement the interface's ImageTileSource.GetImageSource method that returns a bitmap for each tile based on its indices and the map control's zoom level.
Assign an instance of the class you developed to the ImageTileDataProvider.TileSource property.

NOTE

A complete sample project is available at https://github.com/DevExpress-Examples/dxmap-how-to-use-in-memory-image-tile-provider

Markup

XAML

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:DXMapInMemoryTileProvider"
        xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map" 
        x:Class="DXMapInMemoryTileProvider.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <dxm:MapControl>
            <dxm:ImageLayer x:Name="imageLayer"/>
        </dxm:MapControl>
    </Grid>
</Window>

using DevExpress.Xpf.Map;
using System;
using System.Globalization;
using System.Windows;
using System.Windows.Media;
using System.Windows.Media.Imaging;
namespace DXMapInMemoryTileProvider {
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window {
        public MainWindow() {
            InitializeComponent();
            ImageTileDataProvider tileDataProvider = new ImageTileDataProvider();
            tileDataProvider.TileSource = new SimpleTileGenerator();
            this.imageLayer.DataProvider = tileDataProvider;
        }
    }
    public class SimpleTileGenerator : ImageTileSource {
        Random rnd = new Random();
        public override string Name => nameof(SimpleTileGenerator);
        public override ImageSource GetImageSource(long x, long y, int level, Size size) {
            DrawingVisual drawingVisual = new DrawingVisual();
            using (DrawingContext drawingContext = drawingVisual.RenderOpen()) {
                FormattedText text = new FormattedText($"{x}:{y}:{level}", new CultureInfo("en-us"),
                                     FlowDirection.LeftToRight, new Typeface("Arial"), 14, Brushes.Black);
                drawingContext.DrawRectangle(new SolidColorBrush(Color.FromArgb(128, (byte)rnd.Next(255),
                                                                        (byte)rnd.Next(255), (byte)rnd.Next(255))), null, 
                                                                        new Rect(new Point(), size));
                drawingContext.DrawText(text, new Point(5, 5));
                drawingContext.Close();
            }
            RenderTargetBitmap bmp = new RenderTargetBitmap((int)size.Width, (int)size.Height, 96, 96, PixelFormats.Pbgra32);
            bmp.Render(drawingVisual);
            return bmp;
        }
        protected override MapDependencyObject CreateObject() {
            return new SimpleTileGenerator();
        }
    }
}

Imports DevExpress.Xpf.Map
Imports System
Imports System.Globalization
Imports System.Windows
Imports System.Windows.Media
Imports System.Windows.Media.Imaging
Namespace DXMapInMemoryTileProvider
    Public Partial Class MainWindow
        Inherits Window
        Public Sub New()
            InitializeComponent()
            Dim tileDataProvider As ImageTileDataProvider = New ImageTileDataProvider()
            tileDataProvider.TileSource = New SimpleTileGenerator()
            Me.imageLayer.DataProvider = tileDataProvider
        End Sub
    End Class
    Public Class SimpleTileGenerator
        Inherits ImageTileSource
        Private rnd As Random = New Random()
        Public Overrides ReadOnly Property Name As String
            Get
                Return NameOf(SimpleTileGenerator)
            End Get
        End Property
        Public Overrides Function GetImageSource(ByVal x As Long, ByVal y As Long, ByVal level As Integer, ByVal size As Size) As ImageSource
            Dim drawingVisual As DrawingVisual = New DrawingVisual()

            Using drawingContext As DrawingContext = drawingVisual.RenderOpen()
                Dim text As FormattedText = New FormattedText($"{x}:{y}:{level}", New CultureInfo("en-us"), FlowDirection.LeftToRight, New Typeface("Arial"), 14, Brushes.Black)
                drawingContext.DrawRectangle(New SolidColorBrush(Color.FromArgb(128, CByte(rnd.[Next](255)), CByte(rnd.[Next](255)), CByte(rnd.[Next](255)))), Nothing, New Rect(New Point(), size))
                drawingContext.DrawText(text, New Point(5, 5))
                drawingContext.Close()
            End Using
            Dim bmp As RenderTargetBitmap = New RenderTargetBitmap(CInt(size.Width), CInt(size.Height), 96, 96, PixelFormats.Pbgra32)
            bmp.Render(drawingVisual)
            Return bmp
        End Function

        Protected Overrides Function CreateObject() As MapDependencyObject
            Return New SimpleTileGenerator()
        End Function
    End Class
End Namespace