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RectangleHotSpot.GetCoordinates 方法

定義

傳回字串,表示 RectangleHotSpot 物件左上角的 X 和 Y 軸及其右下角的 X 和 Y 軸。

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

傳回

字串,表示 RectangleHotSpot 物件左上角的 X 和 Y 軸及其右下角的 X 和 Y 軸。

範例

下列程式代碼範例示範如何以宣告方式建立包含兩RectangleHotSpotImageMap 物件的控件。 屬性 ImageMap.HotSpotMode 設定為 HotSpotMode.PostBack,這會導致每次使用者按兩下其中一個作用點區域時,頁面回傳至伺服器。 每次使用者按兩下其中 RectangleHotSpot 一個物件時,都會呼叫 方法, GetCoordinates 並向用戶顯示所選用點的座標。 若要讓這個範例正確運作,您必須提供 ImageUrl 屬性自己的映像,並適當地更新映像的路徑,讓應用程式可以找到它。

<%@ 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>

備註

這個方法會傳回字串,表示 RectangleHotSpot 物件的左上角座標及其右下角的座標。 這個方法會使用指派給 LeftTop 屬性的值,傳回左上角的座標。 它會使用指派給 RightBottom 屬性的值,傳回右下角的座標。

方法 GetCoordinates 會透過 ASP.NET 在內部使用,以取得在轉譯時用於 座標的 RectangleHotSpot 文字。 傳回的字串是瀏覽器和標記語言特有的。

適用於

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