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Moving Transparent Control

Hi,
I wish to code a control that writes a text over a picturebox and that can
be dragged with mouse.

Here is what i've actually coded to obtain a similar effect, but as you can
see i've serious problems with trasparence

Create new project and add a button in the form and then insert a background
image to the form itself.

Private Sub Button1_Click(B yVal sender As System.Object, ByVal e As
System.EventArg s) Handles Button1.Click
Dim NewTextLayer As New LayerText
With NewTextLayer
.Text = "Click Here!"
.ForeColor = Color.Blue
.Font = New Font("Arial Black", 20)
.Angle = 10

.Size = New System.Drawing. Size(200, 100)
.Location = New System.Drawing. Point(100, 30)
End With
Me.Controls.Add (NewTextLayer)
End Sub
This is a class:
Imports System.Drawing
Imports System.Drawing. Drawing2D

Public Class LayerText : Inherits Control
Private _backBuffer As Bitmap
Private _angle As Single
Private dragPoint As Point

Public Property Angle() As Single
Get
Return _angle
End Get
Set(ByVal Value As Single)
If _angle <> Value Then
_angle = Value
Me.Invalidate()
End If
End Set
End Property
Public Sub New()
SetStyle(Contro lStyles.DoubleB uffer Or _
ControlStyles.A llPaintingInWmP aint Or
ControlStyles.U serPaint Or _
ControlStyles.O paque, True)
End Sub
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
If BackgroundImage Is Nothing Then
If Not (Parent.Backgro undImage Is Nothing) Then
e.Graphics.Draw Image(Parent.Ba ckgroundImage, _
New Rectangle(0, 0, Width, Height), _
Me.Left, Me.Top, Width, Height, GraphicsUnit.Pi xel)
Else
e.Graphics.Fill Rectangle(New SolidBrush(Pare nt.BackColor), _

New Rectangle(0, 0, Width, Height))
End If
End If

If _backBuffer Is Nothing Then
_backBuffer = New
Bitmap(Me.Clien tSize.Width,Me. ClientSize.Heig ht)
End If

Dim nGraphics As Graphics = Nothing
nGraphics = Graphics.FromIm age(_backBuffer )

With nGraphics
'.Clear(Color.T ransparent)

.RotateTransfor m(Angle)
.SmoothingMode = SmoothingMode.H ighQuality

.DrawString(Tex t, Font, New SolidBrush(Fore Color), New
PointF(0,0))
.Dispose()
End With

e.Graphics.Draw ImageUnscaled(_ backBuffer, 0, 0)
End Sub

Private Sub TextLayer_Mouse Down(ByVal sender As Object, ByVal e As
System.Windows. Forms.MouseEven tArgs) andles MyBase.MouseDow n
If e.Button = MouseButtons.Le ft Then
dragPoint.X = e.X
dragPoint.Y = e.Y
End If
End Sub
Private Sub TextLayer_Mouse Move(ByVal sender As Object, ByVal e As
System.Windows. Forms.MouseEven tArgs) Handles MyBase.MouseMov e
If e.Button = MouseButtons.Le ft Then
Location = New Point(Left + e.X - dragPoint.X, Top + e.Y -
dragPoint.Y)
Me.Invalidate()
End If
End Sub

End Class
Please any tips to enhance this code is welcomed
Thacks in andvance

Nov 20 '05 #1
0 1255

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