通过

PolygonHotSpot.Coordinates 属性

  • 参考

定义

命名空间:
System.Web.UI.WebControls
程序集:
System.Web.dll

表示 PolygonHotSpot 对象顶点的坐标的字符串。

public:
 property System::String ^ Coordinates { System::String ^ get(); void set(System::String ^ value); };
public string Coordinates { get; set; }
member this.Coordinates : string with get, set
Public Property Coordinates As String

属性值

String

表示 PolygonHotSpot 对象的顶点坐标的字符串。

示例

下面的代码示例演示如何以编程方式创建 PolygonHotSpot 对象并将其添加到 ImageMap 控件。 属性 Coordinates 用于指定 对象的顶点的 PolygonHotSpot 坐标。 控件 ImageMap 包含以声明方式添加的其他 PolygonHotSpot 两个对象。 每个 PolygonHotSpot 对象都表示地图上的一个地理区域。 当用户单击对象时 PolygonHotSpot ，它会发回服务器，热点的类型和名称将显示在标签中。

<%@ Page Language="C#" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  void Page_Load(object sender, EventArgs e)
  {  
    // Programmatically create a PolygonHotSpot.
    PolygonHotSpot Polygon1 = new PolygonHotSpot();
    Polygon1.Coordinates = "128,185,335,157,400,224,400,400,228,400";
    Polygon1.PostBackValue = "Southern";
    Polygon1.AlternateText = "Southern Region";
    
    // Add it to the end of the ImageMap control's
    // HotSpotCollection.
    Regions.HotSpots.Add(Polygon1);
  }
  
  void RegionMap_Clicked (object sender, ImageMapEventArgs e)
  {
    string hotSpotType;

    // When a user clicks a hot spot, display
    // the hot spot's type and name.
    switch (e.PostBackValue)
    {
      case "Western":
        hotSpotType = Regions.HotSpots[0].ToString();
        Message1.Text = "You selected " + hotSpotType + " " + e.PostBackValue;
        break;
        
      case "Northern":
        hotSpotType = Regions.HotSpots[1].ToString();
        Message1.Text = "You selected " + hotSpotType + " " + e.PostBackValue;
        break;

      case "Southern":
        hotSpotType = Regions.HotSpots[2].ToString();
        Message1.Text = "You selected " + hotSpotType + " " + e.PostBackValue;
        break;

      default:
        Message1.Text = "You did not click a valid hot spot region.";
        break;
    }
  }  
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
  <title>PolygonHotSpot Constructor Example</title>
</head>
  <body>
    <form id="Form1" runat="server">
    
      <h3>PolygonHotSpot Constructor Example</h3>
      
      <!-- Change or remove the width and height attributes as
           appropriate for your image. -->
      <asp:imagemap id="Regions"           
        imageurl="Images/RegionMap.jpg"
        alternatetext="Sales regions" 
        hotspotmode="PostBack"
        width="400"
        height="400"
        onclick="RegionMap_Clicked"   
        runat="Server">            
          
        <asp:PolygonHotSpot 
          coordinates="0,0,176,0,125,182,227,400,0,400"         
          postbackvalue="Western"
          alternatetext="Western Region">
        </asp:PolygonHotSpot>
          
        <asp:PolygonHotSpot 
          coordinates="177,0,400,0,400,223,335,154,127,180"         
          postbackvalue="Northern"
          alternatetext="Northern Region">
        </asp:PolygonHotSpot>
      
      </asp:imagemap>
            
      <br /><br />
          
      <asp:label id="Message1"
        runat="Server">
      </asp:label>                 
                 
    </form>      
  </body>
</html>

<%@ Page Language="VB" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<script runat="server">
  
  Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    ' Programmatically create a PolygonHotSpot.
    Dim Polygon1 As New PolygonHotSpot
    Polygon1.Coordinates = "128,185,335,157,400,224,400,400,228,400"
    Polygon1.PostBackValue = "Southern"
    Polygon1.AlternateText = "Southern Region"
    
    ' Add it to the end of the ImageMap control's
    ' HotSpotCollection.
    Regions.HotSpots.Add(Polygon1)
  End Sub
  
  Sub RegionMap_Clicked(ByVal sender As Object, ByVal e As ImageMapEventArgs)
    Dim hotSpotType As String
        
    ' When a user clicks a hot spot, display
    ' the hot spot's type and name.
    Select Case (e.PostBackValue)
      
      Case ("Western")
        hotSpotType = Regions.HotSpots(0).ToString()
        Message1.Text = "You selected " & hotSpotType & " " & e.PostBackValue
      
      Case ("Northern")
        hotSpotType = Regions.HotSpots(1).ToString()
        Message1.Text = "You selected " & hotSpotType & " " & e.PostBackValue
      
      Case ("Southern")
        hotSpotType = Regions.HotSpots(2).ToString()
        Message1.Text = "You selected " & hotSpotType & " " & e.PostBackValue
      
      Case Else
        Message1.Text = "You did not click a valid hot spot region."
    
    End Select
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
  <title>PolygonHotSpot Constructor Example</title>
</head>
  <body>
    <form id="Form1" runat="server">
    
      <h3>PolygonHotSpot Constructor Example</h3>
      
      <!-- Change or remove the width and height attributes as
           appropriate for your image. -->
      <asp:imagemap id="Regions"           
        imageurl="Images/RegionMap.jpg"
        alternatetext="Sales regions" 
        hotspotmode="PostBack"
        width="400"
        height="400"
        onclick="RegionMap_Clicked"   
        runat="Server">            
          
        <asp:PolygonHotSpot 
          coordinates="0,0,176,0,125,182,227,400,0,400"         
          postbackvalue="Western"
          alternatetext="Western Region">
        </asp:PolygonHotSpot>
          
        <asp:PolygonHotSpot 
          coordinates="177,0,400,0,400,223,335,154,127,180"         
          postbackvalue="Northern"
          alternatetext="Northern Region">
        </asp:PolygonHotSpot>
      
      </asp:imagemap>
            
      <br /><br />
          
      <asp:label id="Message1"
        runat="Server">
      </asp:label>                 
                 
    </form>      
  </body>
</html>

注解

Coordinates使用 属性可以指定 对象的顶点的PolygonHotSpot坐标。 多边形顶点是两个多边形边缘相交的点。 指定的字符串的格式必须用逗号分隔的每个坐标。 指定的每个顶点必须同时具有 x 坐标和 y 坐标。 例如，字符串“128,185,335,157,510,224,510,383,228,383”定义具有五个顶点的多边形热点。 第一个顶点的 x 坐标为 128。 第一个顶点的 y 坐标为 185。

适用于

另请参阅