CircleHotSpot.GetCoordinates Method ()

 

Returns a string that represents the x- and y-coordinates of a CircleHotSpot object's center and the length of its radius.

Namespace:   System.Web.UI.WebControls
Assembly:  System.Web (in System.Web.dll)

public override string GetCoordinates()

Return Value

Type: System.String

A string that represents the x- and y-coordinates of a CircleHotSpot object's center and the length of its radius.

This method uses the values assigned to the X and Y properties to return the center coordinates and the value assigned to the Radius property to return the radius.

The GetCoordinates method is used internally by ASP.NET to get the text to use for the coordinates of a CircleHotSpot when it is rendered.

The following code example demonstrates how to declaratively create an ImageMap control that contains two CircleHotSpot objects. When a user clicks one of the CircleHotSpot objects, the GetCoordinates method returns its coordinates and displays them 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 ShopMap_Clicked(object sender, ImageMapEventArgs e)
  {    
    string coordinates;

    // When a user clicks the Circle1 hot spot,
    // display the hot spot's coordinates.
    //if (e.Value == "Circle1")
    if (e.PostBackValue.ToString() == "Circle1")
    {
      coordinates = Shop.HotSpots[0].GetCoordinates();
      Message1.Text = "The hot spot's coordinates are " + coordinates + ".";
    }

    // When a user clicks the Circle2 hot spot,
    // display the hot spot's coordinates.
    //else if (e.Value == "Circle2")
    else if (e.PostBackValue.ToString() == "Circle2")
    {
      coordinates = Shop.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>CircleHotSpot.GetCoordinates Example</title>
</head>
  <body>
    <form id="form1" runat="server">

      <h3>CircleHotSpot.GetCoordinates Example</h3>

      <h4>Shopping Choices:</h4>

      <asp:imagemap id="Shop"           
        imageurl="Images/ShopChoice.jpg" 
        width="150"
        height="360" 
        onclick="ShopMap_Clicked"
        alternatetext="Shopping choices"
        runat="Server">    

        <asp:circlehotspot
          postbackvalue="Circle1"
          x="75"
          y="120"
          radius="75"
          hotspotmode="PostBack"
          alternatetext="Shop for toys.">           
        </asp:circlehotspot> 

        <asp:circlehotspot
          postbackvalue="Circle2"
          x="75"
          y="290"
          radius="75"
          hotspotmode="PostBack"
          alternatetext="Shop for wine.">           
        </asp:circlehotspot>     

      </asp:imagemap>          

      <br />

      <asp:label id="Message1"
        runat="Server">
      </asp:label>             

    </form>      
  </body>
</html>

.NET Framework
Available since 2.0
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