📄 painter.aspx

📁 asp.net技术内幕的书配源码

💻 ASPX

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<%@ Import Namespace="System.Drawing" %>

<Script Runat="Server">

Sub Page_Load
  If Not IsPostBack Then
    ibtnCanvas.ImageUrl = "PaintImage.aspx"
    lstColor.DataSource = System.Enum.GetValues( GetType( KnownColor ) )
    lstColor.SelectedIndex = 0
    lstAction.SelectedIndex = 0
    DataBind()
  End If
End Sub

Sub ibtnCanvas_Click( s As Object, e As ImageClickEventArgs )
  Dim strQueryString As String

  strQueryString &= "a=" & lstAction.SelectedItem.Text
  strQueryString &= "&color=" & lstColor.SelectedItem.Text
  strQueryString &= "&x=" & e.X
  strQueryString &= "&y=" & e.y
  ibtnCanvas.ImageUrl = "PaintImage.aspx?" & strQueryString
End Sub

Sub btnClear_Click( s As Object, e As EventArgs )
  Session( "Canvas" ) = Nothing
  ibtnCanvas.ImageURL = "PaintImage.aspx"
End Sub

</Script>

<html>
<head><title>Painter.aspx</title></head>
<body>
<form Runat="Server">

<table width="100%">
<tr><td valign="top">

<h3>Draw:</h3>
<asp:ListBox
  ID="lstAction"
  Runat="Server" >
<asp:ListItem Text="SetPixel" />
<asp:ListItem Text="DrawLine" />
<asp:ListItem Text="DrawRectangle" />
<asp:ListItem Text="FillRectangle" />
</asp:ListBox>

<h3>Color:</h3>
<asp:ListBox
  id="lstColor"
  Runat="Server" />
<p>
<asp:Button
  id="btnClear"
  Text="Clear All"
  OnClick="btnClear_Click"
  Runat="Server" />

</td><td valign="top">
<asp:ImageButton
  id="ibtnCanvas"
  OnClick="ibtnCanvas_Click"
  Runat="Server" />

</td></tr>
</table>

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

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