RectangleHotSpot.GetCoordinates Method
Definition
Important
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Returns a string that represents the x -and y-coordinates of a RectangleHotSpot object's top left corner and the x- and y-coordinates of its bottom right corner.
public:
override System::String ^ GetCoordinates();public override string GetCoordinates ();override this.GetCoordinates : unit -> stringPublic Overrides Function GetCoordinates () As StringReturns
A string that represents the x- and y-coordinates of a RectangleHotSpot object's top left corner and the x- and y-coordinates of its bottom right corner.
Examples
The following code example demonstrates how to declaratively create an ImageMap control that contains two RectangleHotSpot objects. The ImageMap.HotSpotMode property is set to HotSpotMode.PostBack, which causes the page to post back to the server each time a user clicks one of the hot spot regions. Each time the user clicks one of the RectangleHotSpot objects, the GetCoordinates method is called and the coordinates of the selected hot spot are displayed to the user. For this example to work correctly, you must supply your own image for the ImageUrl property and update the path to the image appropriately so that the application can locate it.
<%@ 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 VoteMap_Clicked(object sender, ImageMapEventArgs e)
{
string coordinates;
// When a user clicks the "Yes" hot spot,
// display the hot spot's coordinates.
if (e.PostBackValue == "Yes")
{
coordinates = Vote.HotSpots[0].GetCoordinates();
Message1.Text = "The hot spot's coordinates are " + coordinates;
}
// When a user clicks the "No" hot spot,
// display the hot spot's coordinates.
else if (e.PostBackValue == "No")
{
coordinates = Vote.HotSpots[1].GetCoordinates();
Message1.Text = "The hot spot's coordinates are " + coordinates;
}
else
Message1.Text = "You did not click a valid hot spot region.";
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>RectangleHotSpot.GetCoordinates Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>RectangleHotSpot.GetCoordinates Example</h3>
<!-- Change or remove the width and height attributes as
appropriate for your image. -->
<asp:imagemap id="Vote"
imageurl="Images/VoteImage.jpg"
alternatetext="Voting choices"
hotspotmode="PostBack"
width="400"
height="200"
onclick="VoteMap_Clicked"
runat="Server">
<asp:RectangleHotSpot
top="0"
left="0"
bottom="200"
right="200"
postbackvalue="Yes"
alternatetext="Vote yes">
</asp:RectangleHotSpot>
<asp:RectangleHotSpot
top="0"
left="201"
bottom="200"
right="400"
postbackvalue="No"
alternatetext="Vote no">
</asp:RectangleHotSpot>
</asp:imagemap>
<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 VoteMap_Clicked(ByVal sender As Object, ByVal e As ImageMapEventArgs)
Dim coordinates As String
' When a user clicks the "Yes" hot spot,
' display the hot spot's coordinates.
If (e.PostBackValue = "Yes") Then
coordinates = Vote.HotSpots(0).GetCoordinates()
Message1.Text = "The hot spot's coordinates are " & coordinates
' When a user clicks the "No" hot spot,
' display the hot spot's coordinates.
ElseIf (e.PostBackValue = "No") Then
coordinates = Vote.HotSpots(1).GetCoordinates()
Message1.Text = "The hot spot's coordinates are " & coordinates
Else
Message1.Text = "You did not click in a valid hot spot region."
End If
End Sub
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
<title>RectangleHotSpot.GetCoordinates Example</title>
</head>
<body>
<form id="Form1" runat="server">
<h3>RectangleHotSpot.GetCoordinates Example</h3>
<!-- Change or remove the width and height attributes as
appropriate for your image. -->
<asp:imagemap id="Vote"
imageurl="Images/VoteImage.jpg"
alternatetext="Voting choices"
hotspotmode="PostBack"
width="400"
height="200"
onclick="VoteMap_Clicked"
runat="Server">
<asp:RectangleHotSpot
top="0"
left="0"
bottom="200"
right="200"
postbackvalue="Yes"
alternatetext="Vote yes">
</asp:RectangleHotSpot>
<asp:RectangleHotSpot
top="0"
left="201"
bottom="200"
right="400"
postbackvalue="No"
alternatetext="Vote no">
</asp:RectangleHotSpot>
</asp:imagemap>
<br /><br />
<asp:label id="Message1"
runat="Server">
</asp:label>
</form>
</body>
</html>
Remarks
This method returns a string that represents the coordinates of a RectangleHotSpot object's top left corner and the coordinates of its bottom right corner. This method uses the values assigned to the Left and Top properties to return the coordinates for the top left corner. It uses the values assigned to the Right and Bottom properties to return the coordinates for the bottom right corner.
The GetCoordinates method is used internally by ASP.NET to get the text to use for the coordinates of a RectangleHotSpot when it is rendered. The string that is returned is specific to the browser and markup language.
