PolygonHotSpot Constructor ()
.NET Framework (current version)
Initializes a new instance of the PolygonHotSpot class.
Assembly: System.Web (in System.Web.dll)
Use this constructor to initialize a new instance of the PolygonHotSpot class.
The following code example demonstrates how to programmatically create a PolygonHotSpot object and add it to an ImageMap control. The ImageMap control contains two other PolygonHotSpot objects that have been added declaratively. Each PolygonHotSpot object represents a geographical region on the map. When the user clicks a PolygonHotSpot object, it posts back to the server and the type and name of the hot spot are displayed in a label.
<%@ 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>
.NET Framework
Available since 2.0
Available since 2.0
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