信息展示

Symbols（样式） and renderers（渲染器）

Simple (web) symbols

XAML定义symbols

<Grid.Resources><ResourceDictionary><!--Define symbols in the Resources section (of a UIControl, Page, or App)--><esri:SimpleMarkerSymbol x:Key="RedCircleSym" Color="Red" Style="Circle"  Size="14"/><esri:SimpleLineSymbol x:Key="DashedGreenLineSym" Color="Green" Style="Dash" Width="3"/><esri:SimpleFillSymbol x:Key="BlueDiagonalHashFillSym" Color="Blue" Style="ForwardDiagonal" Outline="{StaticResource DashedGreenLineSym}"/></ResourceDictionary>
</Grid.Resources>

C#定义symbols

// 创建一个SimpleMarkerSymbol
var markerSym = new SimpleMarkerSymbol
{Style = SimpleMarkerSymbolStyle.Circle,Color = Colors.Red,Size = 12
};// 创建一个TextSymbol
var textSym = new TextSymbol
{Angle = -55,Color = Colors.Red,Size = 18,Text = "You are here",HorizontalAlignment = Esri.ArcGISRuntime.Symbology.HorizontalAlignment.Left,VerticalAlignment = Esri.ArcGISRuntime.Symbology.VerticalAlignment.Bottom
};// 用SimpleMarkerSymbol创建一个点
var pointGraphic = new Graphic(point, markerSym);//用TextSymbol创建一个文字
var textGraphic = new Graphic(point, textSym);// 把文字和点添加到MapView
var graphics = MyMapView.GraphicsOverlays[0].Graphics;
graphics.Add(pointGraphic);
graphics.Add(textGraphic);

Picture symbols

PictureMarkerSymbol

// 用本地图片新建一个PictureMarkerSymbol
var picPath = @"C:\Temp\campsite.png";
PictureMarkerSymbol pictureMarkerSym;
using (System.IO.FileStream picStream = new System.IO.FileStream(picPath, System.IO.FileMode.Open))
{// 通过文件流去创建PictureMarkerSymbolpictureMarkerSym = await PictureMarkerSymbol.CreateAsync(picStream);
}// 创建Graphic并添加到MapView
var graphic = new Graphic(location, pictureMarkerSym);
MyMapView.GraphicsOverlays[0].Graphics.Add(graphic);

graph LR
本地文件-->PictureMarkerSymbol
URL-->PictureMarkerSymbol
项目资源-->PictureMarkerSymbol
Json-->PictureMarkerSymbol

Multilayer (advanced) symbols

Multilayer symbols are based on a subset of ArcGIS Pro's symbology model

• ==ArcGIS Pro的符号子集==
• ==multilayer symbols可以保证转换web地图服务时web symbols不丢失==

应用一个符号到一个图形

// 定义一个web墨卡托坐标系下的地图点
var point = new MapPoint(-226773, 6550477, SpatialReferences.WebMercator);// 创建一个红颜色的SimpleMarkerSymbol
var markerSym = new SimpleMarkerSymbol
{Style = SimpleMarkerSymbolStyle.Circle,Color = Colors.Red,Size = 12
};// 创建一个Graphic用刚创建的符号
var pointGraphic = new Graphic(point, markerSym);// 添加到MapView
MyMapView.GraphicsOverlays[0].Graphics.Add(pointGraphic);

==应用符号于一个图形会代替任何此图形所在图层的渲染器==

Renderers

Simple renderer

XAML

<Grid Grid.Column="1"><Grid.Resources><ResourceDictionary><!--Define a red "X" marker symbol--><esri:SimpleMarkerSymbol x:Key="RedXSym" Color="Red" Style="X" Size="10"/><!--Define a simple renderer that uses the symbol above--><esri:SimpleRenderer x:Key="MySimpleRenderer" Symbol="{StaticResource RedXSym}"/></ResourceDictionary></Grid.Resources><esri:MapView x:Name="MyMapView"><esri:MapView.GraphicsOverlays><esri:GraphicsOverlay x:Name="MyGraphics" Renderer="{StaticResource MySimpleRenderer}"/></esri:MapView.GraphicsOverlays><esri:Map><esri:ArcGISTiledLayer Name="Topographic"Source="http://services.arcgisonline.com/ArcGIS/rest/services/World_Topo_Map/MapServer"/></esri:Map></esri:MapView>
</Grid>

Unique value renderer

// 创建一个ServiceFeatureTable
var statesFeatureTable = new ServiceFeatureTable(new System.Uri("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3"));
// 创建一个OutFields用来渲染图层中的多边形
//statesFeatureTable.OutFields.Add("STATE_ABBR");
// 用ServiceFeatureTable创建一个要素图层
var statesLayer = new FeatureLayer(statesFeatureTable);// 创建一个新的UniqueValueRenderer
var stateRenderer = new UniqueValueRenderer();
// 添加一个"STATE_ABBR"字段给UniqueValueRenderer
stateRenderer.FieldNames.Add("STATE_ABBR");// 定义唯一填充符号
var nevadaFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Colors.Blue, null);
var arizonaFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Colors.Green, null);
var californiaFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Colors.Red, null);// 添加符号到渲染器
stateRenderer.UniqueValues.Add(new UniqueValue("Nevada", "Nevada", nevadaFillSymbol, "NV"));
stateRenderer.UniqueValues.Add(new UniqueValue("Arizona", "Arizona", arizonaFillSymbol, "AZ"));
stateRenderer.UniqueValues.Add(new UniqueValue("California", "California", californiaFillSymbol, "CA"));var defaultFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Null, Colors.Transparent, null);
stateRenderer.DefaultSymbol = defaultFillSymbol;
stateRenderer.DefaultLabel = "Other";// 应用渲染器
statesLayer.Renderer = stateRenderer;
// MapView添加图层
MyMapView.Map.OperationalLayers.Add(statesLayer);

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