RectangleHotSpot.GetCoordinates 方法

定义

返回一个字符串,该字符串表示 RectangleHotSpot 对象左上角和右下角的 x 坐标和 y 坐标。

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

返回

一个字符串,表示 RectangleHotSpot 对象左上角和右下角的 x 坐标和 y 坐标。

示例

下面的代码示例演示如何以声明方式创建包含两RectangleHotSpotImageMap 对象的控件。 属性 ImageMap.HotSpotMode 设置为 HotSpotMode.PostBack,这会导致每次用户单击某个热点区域时,页面都会发回服务器。 用户每次单击其中 RectangleHotSpot 一个对象时 GetCoordinates ,都会调用 方法,并将所选热点的坐标显示给用户。 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 VoteMap_Clicked(object sender, ImageMapEventArgs e)
  {
    string coordinates;
        
    // When a user clicks the "Yes" hot spot,
    // display the hot spot's coordinates.
    if (e.PostBackValue == "Yes") 
    {
      coordinates = Vote.HotSpots[0].GetCoordinates();
      Message1.Text = "The hot spot's coordinates are " + coordinates;
    }
  
    // When a user clicks the "No" hot spot,
    // display the hot spot's coordinates.
    else if (e.PostBackValue == "No") 
    {
      coordinates = Vote.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>RectangleHotSpot.GetCoordinates Example</title>
</head>
  <body>
    <form id="Form1" runat="server">
    
      <h3>RectangleHotSpot.GetCoordinates Example</h3>
      
      <!-- Change or remove the width and height attributes as
           appropriate for your image. -->
      <asp:imagemap id="Vote"           
        imageurl="Images/VoteImage.jpg" 
        alternatetext="Voting choices"
        hotspotmode="PostBack"
        width="400"
        height="200"
        onclick="VoteMap_Clicked"   
        runat="Server">            
          
        <asp:RectangleHotSpot          
          top="0"
          left="0"
          bottom="200"
          right="200"
          postbackvalue="Yes"
          alternatetext="Vote yes">
        </asp:RectangleHotSpot>
          
        <asp:RectangleHotSpot 
          top="0"
          left="201"
          bottom="200"
          right="400"
          postbackvalue="No"
          alternatetext="Vote no">
        </asp:RectangleHotSpot>
      
      </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 VoteMap_Clicked(ByVal sender As Object, ByVal e As ImageMapEventArgs)
    Dim coordinates As String
        
    ' When a user clicks the "Yes" hot spot,
    ' display the hot spot's coordinates.
    If (e.PostBackValue = "Yes") Then
      coordinates = Vote.HotSpots(0).GetCoordinates()
      Message1.Text = "The hot spot's coordinates are " & coordinates
       
      ' When a user clicks the "No" hot spot,
      ' display the hot spot's coordinates.
    ElseIf (e.PostBackValue = "No") Then
      coordinates = Vote.HotSpots(1).GetCoordinates()
      Message1.Text = "The hot spot's coordinates are " & coordinates
      
    Else
      Message1.Text = "You did not click in a valid hot spot region."
                
    End If
        
  End Sub
  
</script>

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
  <title>RectangleHotSpot.GetCoordinates Example</title>
</head>
  <body>
    <form id="Form1" runat="server">
    
      <h3>RectangleHotSpot.GetCoordinates Example</h3>
      
      <!-- Change or remove the width and height attributes as
           appropriate for your image. -->
      <asp:imagemap id="Vote"           
        imageurl="Images/VoteImage.jpg" 
        alternatetext="Voting choices"
        hotspotmode="PostBack"
        width="400"
        height="200"
        onclick="VoteMap_Clicked"   
        runat="Server">            
          
        <asp:RectangleHotSpot          
          top="0"
          left="0"
          bottom="200"
          right="200"
          postbackvalue="Yes"
          alternatetext="Vote yes">
        </asp:RectangleHotSpot>
          
        <asp:RectangleHotSpot 
          top="0"
          left="201"
          bottom="200"
          right="400"
          postbackvalue="No"
          alternatetext="Vote no">
        </asp:RectangleHotSpot>
      
      </asp:imagemap>
            
      <br /><br />
          
      <asp:label id="Message1"
        runat="Server">
      </asp:label>                 
                 
    </form>      
  </body>
</html>

注解

此方法返回一个字符串,表示 RectangleHotSpot 对象的左上角坐标及其右下角的坐标。 此方法使用分配给 LeftTop 属性的值返回左上角的坐标。 它使用分配给 RightBottom 属性的值返回右下角的坐标。

方法 GetCoordinates 由 ASP.NET 在内部使用,以获取呈现 时要用于 坐标 RectangleHotSpot 的文本。 返回的字符串特定于浏览器和标记语言。

适用于

另请参阅