PolygonHotSpot Konstruktor
Definition
Viktigt
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Initierar en ny instans av PolygonHotSpot klassen.
public:
PolygonHotSpot();public PolygonHotSpot();Public Sub New ()Exempel
Följande kodexempel visar hur du programmatiskt skapar ett PolygonHotSpot objekt och lägger till det i en ImageMap kontroll. Kontrollen ImageMap innehåller två andra PolygonHotSpot objekt som har lagts till deklarativt. Varje PolygonHotSpot objekt representerar en geografisk region på kartan. När användaren klickar på ett PolygonHotSpot objekt skickas det tillbaka till servern och typen och namnet på den aktiva platsen visas i en etikett.
<%@ 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>
Kommentarer
Använd den här konstruktorn för att initiera en ny instans av PolygonHotSpot klassen.
