CircleHotSpot.GetCoordinates 方法

  • 参考

定义

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

返回表示 CircleHotSpot 对象的中心的 x 和 y 坐标及其半径长度的字符串。

public:
 override System::String ^ GetCoordinates();
public override string GetCoordinates ();
override this.GetCoordinates : unit -> string
Public Overrides Function GetCoordinates () As String

返回

String

表示 CircleHotSpot 对象的中心的 x 和 y 坐标及其半径长度的字符串。

示例

下面的代码示例演示如何以声明方式创建包含两CircleHotSpot个 ImageMap 对象的控件。 当用户单击其中一个 CircleHotSpot 对象时 GetCoordinates ，该方法将返回其坐标并将其显示给用户。 若要使此示例正常工作，必须为 属性提供自己的映像 ImageUrl ，并相应地更新映像的路径，以便应用程序能够找到它。

<%@ 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 ShopMap_Clicked(object sender, ImageMapEventArgs e)
  {    
    string coordinates;
    
    // When a user clicks the Circle1 hot spot,
    // display the hot spot's coordinates.
    //if (e.Value == "Circle1")
    if (e.PostBackValue.ToString() == "Circle1")
    {
      coordinates = Shop.HotSpots[0].GetCoordinates();
      Message1.Text = "The hot spot's coordinates are " + coordinates + ".";
    }
      
    // When a user clicks the Circle2 hot spot,
    // display the hot spot's coordinates.
    //else if (e.Value == "Circle2")
    else if (e.PostBackValue.ToString() == "Circle2")
    {
      coordinates = Shop.HotSpots[1].GetCoordinates ();
      Message1.Text = "The hot spot's coordinates are " + coordinates + ".";
    }
    else
      Message1.Text = "You did not click a valid hot spot region.";        
  }

</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="head1" runat="server">
  <title>CircleHotSpot.GetCoordinates Example</title>
</head>
  <body>
    <form id="form1" runat="server">
    
      <h3>CircleHotSpot.GetCoordinates Example</h3>
      
      <h4>Shopping Choices:</h4>
      
      <asp:imagemap id="Shop"           
        imageurl="Images/ShopChoice.jpg" 
        width="150"
        height="360" 
        onclick="ShopMap_Clicked"
        alternatetext="Shopping choices"
        runat="Server">    
        
        <asp:circlehotspot
          postbackvalue="Circle1"
          x="75"
          y="120"
          radius="75"
          hotspotmode="PostBack"
          alternatetext="Shop for toys.">           
        </asp:circlehotspot> 
        
        <asp:circlehotspot
          postbackvalue="Circle2"
          x="75"
          y="290"
          radius="75"
          hotspotmode="PostBack"
          alternatetext="Shop for wine.">           
        </asp:circlehotspot>     
          
      </asp:imagemap>          
      
      <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 ShopMap_Clicked(ByVal sender As Object, ByVal e As ImageMapEventArgs)
    
    Dim coordinates As String
    
    ' When a user clicks the Circle1 hot spot,
    ' display the hot spot's coordinates.
    If (e.PostBackValue.ToString() = "Circle1") Then
      coordinates = Shop.HotSpots(0).GetCoordinates()
      Message1.Text = "The hot spot's coordinates are " & coordinates & "."
                     
      ' When a user clicks the Circle2 hot spot,
      ' display the hot spot's coordinates.
    ElseIf (e.PostBackValue.ToString() = "Circle2") Then
      coordinates = Shop.HotSpots(1).GetCoordinates()
      Message1.Text = "The hot spot's coordinates are " & coordinates & "."
      
    Else
      Message1.Text = "You did not click a valid hot spot region."
                
    End If
        
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="head1" runat="server">
  <title>CircleHotSpot.GetCoordinates Example</title>
</head>
  <body>
    <form id="form1" runat="server">
    
      <h3>CircleHotSpot.GetCoordinates Example</h3>
      
      <h4>Shopping Choices:</h4>
      
      <asp:imagemap id="Shop"           
        imageurl="Images/ShopChoice.jpg"
        width = "150"
        height = "360"
        onclick="ShopMap_Clicked"
        alternatetext="Shopping choices"
        runat="Server">    
        
        <asp:circlehotspot
          postbackvalue="Circle1"
          x="75"
          y="120"
          radius="75"
          hotspotmode="PostBack"
          alternatetext="Shop for toys.">           
        </asp:circlehotspot> 
        
        <asp:circlehotspot
          postbackvalue="Circle2"
          x="75"
          y="290"
          radius="75"
          hotspotmode="PostBack"
          alternatetext="Shop for wine.">           
        </asp:circlehotspot>     
          
      </asp:imagemap>          
      
      <br />
          
      <asp:label id="Message1"
        runat="Server">
      </asp:label>             
                 
    </form>      
  </body>
</html>

注解

此方法使用分配给 X 和 Y 属性的值返回中心坐标，使用分配给 Radius 属性的值返回半径。

方法 GetCoordinates 由 ASP.NET 在内部使用，以便在呈现时获取要用于 的 CircleHotSpot 坐标的文本。

适用于

另请参阅