PolygonHotSpot Konstruktor

Referenz

Definition

Namespace:: System.Web.UI.WebControls

Assembly:: System.Web.dll

Wichtig

Einige Informationen beziehen sich auf Vorabversionen, die vor dem Release ggf. grundlegend überarbeitet werden. Microsoft übernimmt hinsichtlich der hier bereitgestellten Informationen keine Gewährleistungen, seien sie ausdrücklich oder konkludent.

Initialisiert eine neue Instanz der PolygonHotSpot-Klasse.

public:
 PolygonHotSpot();

public PolygonHotSpot ();

Public Sub New ()

Beispiele

Im folgenden Codebeispiel wird veranschaulicht, wie Sie ein PolygonHotSpot -Objekt programmgesteuert erstellen und einem ImageMap Steuerelement hinzufügen. Das ImageMap -Steuerelement enthält zwei weitere PolygonHotSpot Objekte, die deklarativ hinzugefügt wurden. Jedes PolygonHotSpot Objekt stellt eine geografische Region auf der Karte dar. Wenn der Benutzer auf ein PolygonHotSpot Objekt klickt, wird es an den Server zurückgepostet, und Typ und Name des Hotspots werden in einer Bezeichnung angezeigt.

<%@ 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>

Hinweise

Verwenden Sie diesen Konstruktor, um eine neue Instanz der PolygonHotSpot -Klasse zu initialisieren.

Gilt für:

Weitere Informationen

ImageMap-Webserversteuerelement

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