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Q: GIF image on a form

Hi

I have a form on which I have a picture box. I have placed a GIF as the
image for this picture box. The GIF has a transparent background.

If I change the background color of the form, then the GIF appears on the
form correctly i.e. the background of the form shows through the transparent
part of the gif.

However, if I place a BackgroundImage on the form, the transparent part of
the form does not show the BackgroundImage of the form, rather is shows the
back color of the form. This obviously make the GIF not to be "transparen t".

Can anybody help?

Thanks

G
May 19 '06 #1
7 1788
What you need to do is make a user control and then modify it's transparent
property on window construction. You then need to handle "Invalidate Ex"
messages in order to force the parent to redraw your background, rather than
you. Funny you mention this because I had to do this with a "working... .."
animation yesterday.

This sample is in C# but it's easy to convert. You won't be needing a
picture box. Just use DrawImage to render your GIF on the control surface
but overriding the paint event.

http://www.devnewsgroups.net/link.as...rol&lang=en%3E

"G .Net" <no********@ema il.com> wrote in message
news:Jf******** ************@pi pex.net...
Hi

I have a form on which I have a picture box. I have placed a GIF as the
image for this picture box. The GIF has a transparent background.

If I change the background color of the form, then the GIF appears on the
form correctly i.e. the background of the form shows through the
transparent part of the gif.

However, if I place a BackgroundImage on the form, the transparent part of
the form does not show the BackgroundImage of the form, rather is shows
the back color of the form. This obviously make the GIF not to be
"transparen t".

Can anybody help?

Thanks

G

May 19 '06 #2
Hi Fred

Ah, looks like exactly what I need!!!

However, bit of newbie so need help in exactly what to do. Could I trouble
you to give the steps I need?

G

"Fred Hedges" <do******@spamm uch.com> wrote in message
news:e4******** ***********@new s.demon.co.uk.. .
What you need to do is make a user control and then modify it's
transparent property on window construction. You then need to handle
"Invalidate Ex" messages in order to force the parent to redraw your
background, rather than you. Funny you mention this because I had to do
this with a "working... .." animation yesterday.

This sample is in C# but it's easy to convert. You won't be needing a
picture box. Just use DrawImage to render your GIF on the control surface
but overriding the paint event.

http://www.devnewsgroups.net/link.as...rol&lang=en%3E

"G .Net" <no********@ema il.com> wrote in message
news:Jf******** ************@pi pex.net...
Hi

I have a form on which I have a picture box. I have placed a GIF as the
image for this picture box. The GIF has a transparent background.

If I change the background color of the form, then the GIF appears on the
form correctly i.e. the background of the form shows through the
transparent part of the gif.

However, if I place a BackgroundImage on the form, the transparent part
of the form does not show the BackgroundImage of the form, rather is
shows the back color of the form. This obviously make the GIF not to be
"transparen t".

Can anybody help?

Thanks

G


May 19 '06 #3
(1) Create a new User Control

(2) Override it's CreateParms property with this:

Protected Overrides ReadOnly Property CreateParams() As CreateParams

Get

Dim cp As CreateParams = MyBase.CreatePa rams
cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARE NT

Return cp

End Get

End Property

(3) In Sub New(), add the following code:
Me.SetStyle(Con trolStyles.Supp ortsTransparent BackColor, True)
Me.UpdateStyles ()
Me.BackColor = Color.Transpare nt
(4) Override the OnPaintBackgrou nd event, but don't put anything into it:

Protected Overrides Sub OnPaintBackgrou nd(ByVal e As PaintEventArgs)
'
End Sub
(5) Import the GIF into your resources (Project Properties, Resources,
Images, Add Image...).

This will basically give you a transparent surface. Now you can draw your
..GIF onto this transparent surface any way you want, eg:

(6) Override the OnPaint event and use it to draw your image:
Protected Overrides Sub OnPaint(byval e As PaintEventArgs)

' Render our image here, no stretch, modify to stretch to fill
' the control if required.
e.Graphics.Draw Image ( My.Resources.Wh ateverMyGIFImag eIsCalled, 0,
0 )

End Sub

Hope this helps.

"G .Net" <no********@ema il.com> wrote in message
news:jZ******** *************** *******@pipex.n et...
Hi Fred

Ah, looks like exactly what I need!!!

However, bit of newbie so need help in exactly what to do. Could I trouble
you to give the steps I need?

G

"Fred Hedges" <do******@spamm uch.com> wrote in message
news:e4******** ***********@new s.demon.co.uk.. .
What you need to do is make a user control and then modify it's
transparent property on window construction. You then need to handle
"Invalidate Ex" messages in order to force the parent to redraw your
background, rather than you. Funny you mention this because I had to do
this with a "working... .." animation yesterday.

This sample is in C# but it's easy to convert. You won't be needing a
picture box. Just use DrawImage to render your GIF on the control
surface but overriding the paint event.

http://www.devnewsgroups.net/link.as...rol&lang=en%3E

"G .Net" <no********@ema il.com> wrote in message
news:Jf******** ************@pi pex.net...
Hi

I have a form on which I have a picture box. I have placed a GIF as the
image for this picture box. The GIF has a transparent background.

If I change the background color of the form, then the GIF appears on
the form correctly i.e. the background of the form shows through the
transparent part of the gif.

However, if I place a BackgroundImage on the form, the transparent part
of the form does not show the BackgroundImage of the form, rather is
shows the back color of the form. This obviously make the GIF not to be
"transparen t".

Can anybody help?

Thanks

G



May 19 '06 #4
gs
that looks more like VB than c#
I think you will have to fresh out the last stub for OnPaintBackgrou nd
with painting you GB image
Imports System
Imports System.Windows. Forms

Public Class TransparentCont rol
Inherits Control

Private Const WS_EX_TRANSPARE NT As Int32 = &H20

Public Sub New()
Me.SetStyle(Con trolStyles.Supp ortsTransparent BackColor, True)
Me.UpdateStyles ()
Me.BackColor = Color.Transpare nt
End Sub

Protected Overrides ReadOnly Property CreateParams() As CreateParams
Get
Dim cp As CreateParams = MyBase.CreatePa rams
cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARE NT
Return cp
End Get
End Property

Protected Overrides Sub OnPaintBackgrou nd(ByVal e As PaintEventArgs)
' fresh out this partto pain the gb image
End Sub
a primitive example is from the vb help
Private Sub pictureBox1_Pai nt(ByVal sender As Object, ByVal e As
System.Windows. Forms.PaintEven tArgs)
' Create a local version of the graphics object for the PictureBox.
Dim g As Graphics = e.Graphics

' Draw a string on the PictureBox.
g.DrawString("T his is a diagonal line drawn on the control", _
New Font("Arial", 10), Brushes.Red, New PointF(30.0F, 30.0F))
' Draw a line in the PictureBox.
g.DrawLine(Syst em.Drawing.Pens .Red, pictureBox1.Lef t, _
pictureBox1.Top , pictureBox1.Rig ht, pictureBox1.Bot tom)
End Sub 'pictureBox1_Pa int

but then if you already the GB image in some format (tif, bmp,) you may be
better off looking for some picture control to take care of that for you.
Hey, I am newbie to vb too. so I can help very much beyon what I can find by
goole or built help.

you may also want to look at the game snippets or starter kit/template. I
am sure there are plenty of examples for handling graphics

"G .Net" <no********@ema il.com> wrote in message
news:jZ******** *************** *******@pipex.n et...
Hi Fred

Ah, looks like exactly what I need!!!

However, bit of newbie so need help in exactly what to do. Could I trouble
you to give the steps I need?

G

"Fred Hedges" <do******@spamm uch.com> wrote in message
news:e4******** ***********@new s.demon.co.uk.. .
What you need to do is make a user control and then modify it's
transparent property on window construction. You then need to handle
"Invalidate Ex" messages in order to force the parent to redraw your
background, rather than you. Funny you mention this because I had to do
this with a "working... .." animation yesterday.

This sample is in C# but it's easy to convert. You won't be needing a
picture box. Just use DrawImage to render your GIF on the control
surface but overriding the paint event.

http://www.devnewsgroups.net/link.as...rol&lang=en%3E

"G .Net" <no********@ema il.com> wrote in message
news:Jf******** ************@pi pex.net...
Hi

I have a form on which I have a picture box. I have placed a GIF as the
image for this picture box. The GIF has a transparent background.

If I change the background color of the form, then the GIF appears on
the form correctly i.e. the background of the form shows through the
transparent part of the gif.

However, if I place a BackgroundImage on the form, the transparent part
of the form does not show the BackgroundImage of the form, rather is
shows the back color of the form. This obviously make the GIF not to be
"transparen t".

Can anybody help?

Thanks

G



May 19 '06 #5
Many thanks Fred for your comprehensive help.

G

"Fred Hedges" <do******@spamm uch.com> wrote in message
news:e4******** **********@news .demon.co.uk...
(1) Create a new User Control

(2) Override it's CreateParms property with this:

Protected Overrides ReadOnly Property CreateParams() As CreateParams

Get

Dim cp As CreateParams = MyBase.CreatePa rams
cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARE NT

Return cp

End Get

End Property

(3) In Sub New(), add the following code:
Me.SetStyle(Con trolStyles.Supp ortsTransparent BackColor, True)
Me.UpdateStyles ()
Me.BackColor = Color.Transpare nt
(4) Override the OnPaintBackgrou nd event, but don't put anything into it:

Protected Overrides Sub OnPaintBackgrou nd(ByVal e As PaintEventArgs)
'
End Sub
(5) Import the GIF into your resources (Project Properties, Resources,
Images, Add Image...).

This will basically give you a transparent surface. Now you can draw your
.GIF onto this transparent surface any way you want, eg:

(6) Override the OnPaint event and use it to draw your image:
Protected Overrides Sub OnPaint(byval e As PaintEventArgs)

' Render our image here, no stretch, modify to stretch to fill
' the control if required.
e.Graphics.Draw Image ( My.Resources.Wh ateverMyGIFImag eIsCalled, 0,
0 )

End Sub

Hope this helps.

"G .Net" <no********@ema il.com> wrote in message
news:jZ******** *************** *******@pipex.n et...
Hi Fred

Ah, looks like exactly what I need!!!

However, bit of newbie so need help in exactly what to do. Could I
trouble you to give the steps I need?

G

"Fred Hedges" <do******@spamm uch.com> wrote in message
news:e4******** ***********@new s.demon.co.uk.. .
What you need to do is make a user control and then modify it's
transparent property on window construction. You then need to handle
"Invalidate Ex" messages in order to force the parent to redraw your
background, rather than you. Funny you mention this because I had to do
this with a "working... .." animation yesterday.

This sample is in C# but it's easy to convert. You won't be needing a
picture box. Just use DrawImage to render your GIF on the control
surface but overriding the paint event.

http://www.devnewsgroups.net/link.as...rol&lang=en%3E

"G .Net" <no********@ema il.com> wrote in message
news:Jf******** ************@pi pex.net...
Hi

I have a form on which I have a picture box. I have placed a GIF as the
image for this picture box. The GIF has a transparent background.

If I change the background color of the form, then the GIF appears on
the form correctly i.e. the background of the form shows through the
transparent part of the gif.

However, if I place a BackgroundImage on the form, the transparent part
of the form does not show the BackgroundImage of the form, rather is
shows the back color of the form. This obviously make the GIF not to be
"transparen t".

Can anybody help?

Thanks

G



May 20 '06 #6
Thanks gs.

G

"gs" <gs@nomail.ni l> wrote in message
news:ej******** ******@TK2MSFTN GP05.phx.gbl...
that looks more like VB than c#
I think you will have to fresh out the last stub for OnPaintBackgrou nd
with painting you GB image
Imports System
Imports System.Windows. Forms

Public Class TransparentCont rol
Inherits Control

Private Const WS_EX_TRANSPARE NT As Int32 = &H20

Public Sub New()
Me.SetStyle(Con trolStyles.Supp ortsTransparent BackColor, True)
Me.UpdateStyles ()
Me.BackColor = Color.Transpare nt
End Sub

Protected Overrides ReadOnly Property CreateParams() As CreateParams
Get
Dim cp As CreateParams = MyBase.CreatePa rams
cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARE NT
Return cp
End Get
End Property

Protected Overrides Sub OnPaintBackgrou nd(ByVal e As PaintEventArgs)
' fresh out this partto pain the gb image
End Sub
a primitive example is from the vb help
Private Sub pictureBox1_Pai nt(ByVal sender As Object, ByVal e As
System.Windows. Forms.PaintEven tArgs)
' Create a local version of the graphics object for the PictureBox.
Dim g As Graphics = e.Graphics

' Draw a string on the PictureBox.
g.DrawString("T his is a diagonal line drawn on the control", _
New Font("Arial", 10), Brushes.Red, New PointF(30.0F, 30.0F))
' Draw a line in the PictureBox.
g.DrawLine(Syst em.Drawing.Pens .Red, pictureBox1.Lef t, _
pictureBox1.Top , pictureBox1.Rig ht, pictureBox1.Bot tom)
End Sub 'pictureBox1_Pa int

but then if you already the GB image in some format (tif, bmp,) you may be
better off looking for some picture control to take care of that for you.
Hey, I am newbie to vb too. so I can help very much beyon what I can find
by goole or built help.

you may also want to look at the game snippets or starter kit/template. I
am sure there are plenty of examples for handling graphics

"G .Net" <no********@ema il.com> wrote in message
news:jZ******** *************** *******@pipex.n et...
Hi Fred

Ah, looks like exactly what I need!!!

However, bit of newbie so need help in exactly what to do. Could I
trouble you to give the steps I need?

G

"Fred Hedges" <do******@spamm uch.com> wrote in message
news:e4******** ***********@new s.demon.co.uk.. .
What you need to do is make a user control and then modify it's
transparent property on window construction. You then need to handle
"Invalidate Ex" messages in order to force the parent to redraw your
background, rather than you. Funny you mention this because I had to do
this with a "working... .." animation yesterday.

This sample is in C# but it's easy to convert. You won't be needing a
picture box. Just use DrawImage to render your GIF on the control
surface but overriding the paint event.

http://www.devnewsgroups.net/link.as...rol&lang=en%3E

"G .Net" <no********@ema il.com> wrote in message
news:Jf******** ************@pi pex.net...
Hi

I have a form on which I have a picture box. I have placed a GIF as the
image for this picture box. The GIF has a transparent background.

If I change the background color of the form, then the GIF appears on
the form correctly i.e. the background of the form shows through the
transparent part of the gif.

However, if I place a BackgroundImage on the form, the transparent part
of the form does not show the BackgroundImage of the form, rather is
shows the back color of the form. This obviously make the GIF not to be
"transparen t".

Can anybody help?

Thanks

G



May 20 '06 #7
Yes thats correct. I couldn't find the C# version I used the other day, so
pasted the first VB version I came across, but did not edit the message to
take account of this. Actually, it turns out that this one is better.

"gs" <gs@nomail.ni l> wrote in message
news:ej******** ******@TK2MSFTN GP05.phx.gbl...
that looks more like VB than c#
I think you will have to fresh out the last stub for OnPaintBackgrou nd
with painting you GB image
Imports System
Imports System.Windows. Forms

Public Class TransparentCont rol
Inherits Control

Private Const WS_EX_TRANSPARE NT As Int32 = &H20

Public Sub New()
Me.SetStyle(Con trolStyles.Supp ortsTransparent BackColor, True)
Me.UpdateStyles ()
Me.BackColor = Color.Transpare nt
End Sub

Protected Overrides ReadOnly Property CreateParams() As CreateParams
Get
Dim cp As CreateParams = MyBase.CreatePa rams
cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARE NT
Return cp
End Get
End Property

Protected Overrides Sub OnPaintBackgrou nd(ByVal e As PaintEventArgs)
' fresh out this partto pain the gb image
End Sub
a primitive example is from the vb help
Private Sub pictureBox1_Pai nt(ByVal sender As Object, ByVal e As
System.Windows. Forms.PaintEven tArgs)
' Create a local version of the graphics object for the PictureBox.
Dim g As Graphics = e.Graphics

' Draw a string on the PictureBox.
g.DrawString("T his is a diagonal line drawn on the control", _
New Font("Arial", 10), Brushes.Red, New PointF(30.0F, 30.0F))
' Draw a line in the PictureBox.
g.DrawLine(Syst em.Drawing.Pens .Red, pictureBox1.Lef t, _
pictureBox1.Top , pictureBox1.Rig ht, pictureBox1.Bot tom)
End Sub 'pictureBox1_Pa int

but then if you already the GB image in some format (tif, bmp,) you may be
better off looking for some picture control to take care of that for you.
Hey, I am newbie to vb too. so I can help very much beyon what I can find
by goole or built help.

you may also want to look at the game snippets or starter kit/template. I
am sure there are plenty of examples for handling graphics

"G .Net" <no********@ema il.com> wrote in message
news:jZ******** *************** *******@pipex.n et...
Hi Fred

Ah, looks like exactly what I need!!!

However, bit of newbie so need help in exactly what to do. Could I
trouble you to give the steps I need?

G

"Fred Hedges" <do******@spamm uch.com> wrote in message
news:e4******** ***********@new s.demon.co.uk.. .
What you need to do is make a user control and then modify it's
transparent property on window construction. You then need to handle
"Invalidate Ex" messages in order to force the parent to redraw your
background, rather than you. Funny you mention this because I had to do
this with a "working... .." animation yesterday.

This sample is in C# but it's easy to convert. You won't be needing a
picture box. Just use DrawImage to render your GIF on the control
surface but overriding the paint event.

http://www.devnewsgroups.net/link.as...rol&lang=en%3E

"G .Net" <no********@ema il.com> wrote in message
news:Jf******** ************@pi pex.net...
Hi

I have a form on which I have a picture box. I have placed a GIF as the
image for this picture box. The GIF has a transparent background.

If I change the background color of the form, then the GIF appears on
the form correctly i.e. the background of the form shows through the
transparent part of the gif.

However, if I place a BackgroundImage on the form, the transparent part
of the form does not show the BackgroundImage of the form, rather is
shows the back color of the form. This obviously make the GIF not to be
"transparen t".

Can anybody help?

Thanks

G



May 22 '06 #8

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In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

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