PolygonHotSpot.GetCoordinates Metode
Definisi
Penting
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Mengembalikan string yang mewakili koordinat puncak PolygonHotSpot objek.
public:
override System::String ^ GetCoordinates();public override string GetCoordinates ();override this.GetCoordinates : unit -> stringPublic Overrides Function GetCoordinates () As StringMengembalikan
String yang mewakili koordinat puncak PolygonHotSpot objek. Nilai default adalah string kosong ("").
Contoh
Contoh kode berikut menunjukkan cara membuat ImageMap kontrol yang berisi tiga PolygonHotSpot objek. Setiap PolygonHotSpot objek mewakili wilayah geografis di peta. Saat pengguna mengklik PolygonHotSpot objek, pengguna memposting kembali ke server. Metode ini GetCoordinates mengambil koordinat verteks poligon sehingga dapat ditampilkan dalam label.
<%@ 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 RegionMap_Clicked (object sender, ImageMapEventArgs e)
{
string coordinates;
// When a user clicks a hot spot, display
// the hot spot's type and name.
switch (e.PostBackValue)
{
case "Western":
coordinates = Regions.HotSpots[0].GetCoordinates();
Message1.Text = "The coordinates are " + coordinates;
break;
case "Northern":
coordinates = Regions.HotSpots[1].GetCoordinates();
Message1.Text = "The coordinates are " + coordinates;
break;
case "Southern":
coordinates = Regions.HotSpots[2].GetCoordinates();
Message1.Text = "The coordinates are " + coordinates;
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.GetCoordinates Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>PolygonHotSpot.GetCoordinates 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:PolygonHotSpot
coordinates="128,185,335,157,400,224,400,400,228,400"
postbackvalue="Southern"
alternatetext="Southern 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 RegionMap_Clicked(ByVal sender As Object, ByVal e As ImageMapEventArgs)
Dim coordinates As String
' When a user clicks a hot spot, display
' the coordinates of the hot spot's vertices.
Select Case (e.PostBackValue)
Case ("Western")
coordinates = Regions.HotSpots(0).GetCoordinates()
Message1.Text = "The coordinates are " & coordinates
Case ("Northern")
coordinates = Regions.HotSpots(1).GetCoordinates()
Message1.Text = "The coordinates are " & coordinates
Case ("Southern")
coordinates = Regions.HotSpots(2).GetCoordinates()
Message1.Text = "The coordinates are " & coordinates
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.GetCoordinates Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>PolygonHotSpot.GetCoordinates 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:PolygonHotSpot
coordinates="128,185,335,157,400,224,400,400,228,400"
postbackvalue="Southern"
alternatetext="Southern Region">
</asp:PolygonHotSpot>
</asp:imagemap>
<br /><br />
<asp:label id="Message1"
runat="Server">
</asp:label>
</form>
</body>
</html>
Keterangan
Metode GetCoordinates mengembalikan string yang mewakili koordinat puncak PolygonHotSpot objek. String yang dikembalikan metode ini adalah nilai Coordinates properti saat ini.
Metode GetCoordinates ini digunakan secara internal oleh ASP.NET untuk mendapatkan teks yang digunakan untuk koordinat PolygonHotSpot ketika dirender. String yang dikembalikan khusus untuk browser dan bahasa markup.
