PolygonHotSpot.GetCoordinates 方法
定义
重要
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返回表示 PolygonHotSpot 对象的顶点坐标的字符串。
public:
override System::String ^ GetCoordinates();public override string GetCoordinates ();override this.GetCoordinates : unit -> stringPublic Overrides Function GetCoordinates () As String返回
表示 PolygonHotSpot 对象的顶点坐标的字符串。 默认值为空字符串 ("")。
示例
下面的代码示例演示如何创建包含三PolygonHotSpot个 ImageMap 对象的控件。 每个对象都 PolygonHotSpot 表示地图上的一个地理区域。 当用户单击某个 PolygonHotSpot 对象时，它会发回服务器。 方法 GetCoordinates 检索多边形顶点的坐标，以便它们可以显示在标签中。
<%@ 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>
注解
方法 GetCoordinates 返回一个字符串，表示对象的顶点的 PolygonHotSpot 坐标。 此方法返回的字符串是 属性的 Coordinates 当前值。
方法 GetCoordinates 由 ASP.NET 在内部使用，以获取呈现 时要用于 坐标 PolygonHotSpot 的文本。 返回的字符串特定于浏览器和标记语言。
