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Q: GIF image on a formHi
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 "transparent". Can anybody help? Thanks G 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 "InvalidateEx" 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.aspx?url=http://dotnet.mvps.org/dotnet/faqs/?id=transparentcontrol&lang=en%3E Show quoteHide quote "G .Net" <nodamnspam@email.com> wrote in message news:JfqdnbvL_-z4fPDZRVnyiA@pipex.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 > "transparent". > > Can anybody help? > > Thanks > > G > 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 Show quoteHide quote "Fred Hedges" <dontlike@spammuch.com> wrote in message news:e4ko8g$362$1$830fa17d@news.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 > "InvalidateEx" 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.aspx?url=http://dotnet.mvps.org/dotnet/faqs/?id=transparentcontrol&lang=en%3E > > > > "G .Net" <nodamnspam@email.com> wrote in message > news:JfqdnbvL_-z4fPDZRVnyiA@pipex.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 >> "transparent". >> >> Can anybody help? >> >> Thanks >> >> G >> > > (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.CreateParams cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARENT Return cp End Get End Property (3) In Sub New(), add the following code: Me.SetStyle(ControlStyles.SupportsTransparentBackColor, True) Me.UpdateStyles() Me.BackColor = Color.Transparent (4) Override the OnPaintBackground event, but don't put anything into it: Protected Overrides Sub OnPaintBackground(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.DrawImage ( My.Resources.WhateverMyGIFImageIsCalled, 0, 0 ) End Sub Hope this helps. Show quoteHide quote "G .Net" <nodamnspam@email.com> wrote in message news:jZidnYXR75NfdPDZnZ2dnUVZ8qSdnZ2d@pipex.net... > 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" <dontlike@spammuch.com> wrote in message > news:e4ko8g$362$1$830fa17d@news.demon.co.uk... >> What you need to do is make a user control and then modify it's >> transparent property on window construction. You then need to handle >> "InvalidateEx" messages in order to force the parent to redraw your >> background, rather than you. Funny you mention this because I had to do >> this with a "working....." animation yesterday. >> >> This sample is in C# but it's easy to convert. You won't be needing a >> picture box. Just use DrawImage to render your GIF on the control >> surface but overriding the paint event. >> >> http://www.devnewsgroups.net/link.aspx?url=http://dotnet.mvps.org/dotnet/faqs/?id=transparentcontrol&lang=en%3E >> >> >> >> "G .Net" <nodamnspam@email.com> wrote in message >> news:JfqdnbvL_-z4fPDZRVnyiA@pipex.net... >>> Hi >>> >>> I have a form on which I have a picture box. I have placed a GIF as the >>> image for this picture box. The GIF has a transparent background. >>> >>> If I change the background color of the form, then the GIF appears on >>> the form correctly i.e. the background of the form shows through the >>> transparent part of the gif. >>> >>> However, if I place a BackgroundImage on the form, the transparent part >>> of the form does not show the BackgroundImage of the form, rather is >>> shows the back color of the form. This obviously make the GIF not to be >>> "transparent". >>> >>> Can anybody help? >>> >>> Thanks >>> >>> G >>> >> >> > > Many thanks Fred for your comprehensive help.
G Show quoteHide quote "Fred Hedges" <dontlike@spammuch.com> wrote in message news:e4kqgh$hf$1$830fa7a5@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.CreateParams > cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARENT > > Return cp > > End Get > > End Property > > (3) In Sub New(), add the following code: > > > Me.SetStyle(ControlStyles.SupportsTransparentBackColor, True) > Me.UpdateStyles() > Me.BackColor = Color.Transparent > > > (4) Override the OnPaintBackground event, but don't put anything into it: > > Protected Overrides Sub OnPaintBackground(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.DrawImage ( My.Resources.WhateverMyGIFImageIsCalled, 0, > 0 ) > > End Sub > > > > Hope this helps. > > > > > > "G .Net" <nodamnspam@email.com> wrote in message > news:jZidnYXR75NfdPDZnZ2dnUVZ8qSdnZ2d@pipex.net... >> 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" <dontlike@spammuch.com> wrote in message >> news:e4ko8g$362$1$830fa17d@news.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 >>> "InvalidateEx" 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.aspx?url=http://dotnet.mvps.org/dotnet/faqs/?id=transparentcontrol&lang=en%3E >>> >>> >>> >>> "G .Net" <nodamnspam@email.com> wrote in message >>> news:JfqdnbvL_-z4fPDZRVnyiA@pipex.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 >>>> "transparent". >>>> >>>> Can anybody help? >>>> >>>> Thanks >>>> >>>> G >>>> >>> >>> >> >> > > that looks more like VB than c#
I think you will have to fresh out the last stub for OnPaintBackground with painting you GB image Imports System Imports System.Windows.Forms Public Class TransparentControl Inherits Control Private Const WS_EX_TRANSPARENT As Int32 = &H20 Public Sub New() Me.SetStyle(ControlStyles.SupportsTransparentBackColor, True) Me.UpdateStyles() Me.BackColor = Color.Transparent End Sub Protected Overrides ReadOnly Property CreateParams() As CreateParams Get Dim cp As CreateParams = MyBase.CreateParams cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARENT Return cp End Get End Property Protected Overrides Sub OnPaintBackground(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_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) ' 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("This 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(System.Drawing.Pens.Red, pictureBox1.Left, _ pictureBox1.Top, pictureBox1.Right, pictureBox1.Bottom) End Sub 'pictureBox1_Paint 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 Show quoteHide quote "G .Net" <nodamnspam@email.com> wrote in message news:jZidnYXR75NfdPDZnZ2dnUVZ8qSdnZ2d@pipex.net... > 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" <dontlike@spammuch.com> wrote in message > news:e4ko8g$362$1$830fa17d@news.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 >> "InvalidateEx" 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.aspx?url=http://dotnet.mvps.org/dotnet/faqs/?id=transparentcontrol&lang=en%3E >> >> >> >> "G .Net" <nodamnspam@email.com> wrote in message >> news:JfqdnbvL_-z4fPDZRVnyiA@pipex.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 >>> "transparent". >>> >>> Can anybody help? >>> >>> Thanks >>> >>> G >>> >> >> > > Thanks gs.
G Show quoteHide quote "gs" <g*@nomail.nil> wrote in message news:ejM2jH2eGHA.3900@TK2MSFTNGP05.phx.gbl... > that looks more like VB than c# > I think you will have to fresh out the last stub for OnPaintBackground > with painting you GB image > Imports System > Imports System.Windows.Forms > > Public Class TransparentControl > Inherits Control > > Private Const WS_EX_TRANSPARENT As Int32 = &H20 > > Public Sub New() > Me.SetStyle(ControlStyles.SupportsTransparentBackColor, True) > Me.UpdateStyles() > Me.BackColor = Color.Transparent > End Sub > > Protected Overrides ReadOnly Property CreateParams() As CreateParams > Get > Dim cp As CreateParams = MyBase.CreateParams > cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARENT > Return cp > End Get > End Property > > Protected Overrides Sub OnPaintBackground(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_Paint(ByVal sender As Object, ByVal e As > System.Windows.Forms.PaintEventArgs) > ' 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("This 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(System.Drawing.Pens.Red, pictureBox1.Left, _ > pictureBox1.Top, pictureBox1.Right, pictureBox1.Bottom) > End Sub 'pictureBox1_Paint > > > > 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" <nodamnspam@email.com> wrote in message > news:jZidnYXR75NfdPDZnZ2dnUVZ8qSdnZ2d@pipex.net... >> 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" <dontlike@spammuch.com> wrote in message >> news:e4ko8g$362$1$830fa17d@news.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 >>> "InvalidateEx" 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.aspx?url=http://dotnet.mvps.org/dotnet/faqs/?id=transparentcontrol&lang=en%3E >>> >>> >>> >>> "G .Net" <nodamnspam@email.com> wrote in message >>> news:JfqdnbvL_-z4fPDZRVnyiA@pipex.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 >>>> "transparent". >>>> >>>> Can anybody help? >>>> >>>> Thanks >>>> >>>> G >>>> >>> >>> >> >> > > 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. Show quoteHide quote "gs" <g*@nomail.nil> wrote in message news:ejM2jH2eGHA.3900@TK2MSFTNGP05.phx.gbl... > that looks more like VB than c# > I think you will have to fresh out the last stub for OnPaintBackground > with painting you GB image > Imports System > Imports System.Windows.Forms > > Public Class TransparentControl > Inherits Control > > Private Const WS_EX_TRANSPARENT As Int32 = &H20 > > Public Sub New() > Me.SetStyle(ControlStyles.SupportsTransparentBackColor, True) > Me.UpdateStyles() > Me.BackColor = Color.Transparent > End Sub > > Protected Overrides ReadOnly Property CreateParams() As CreateParams > Get > Dim cp As CreateParams = MyBase.CreateParams > cp.ExStyle = cp.ExStyle Or WS_EX_TRANSPARENT > Return cp > End Get > End Property > > Protected Overrides Sub OnPaintBackground(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_Paint(ByVal sender As Object, ByVal e As > System.Windows.Forms.PaintEventArgs) > ' 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("This 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(System.Drawing.Pens.Red, pictureBox1.Left, _ > pictureBox1.Top, pictureBox1.Right, pictureBox1.Bottom) > End Sub 'pictureBox1_Paint > > > > 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" <nodamnspam@email.com> wrote in message > news:jZidnYXR75NfdPDZnZ2dnUVZ8qSdnZ2d@pipex.net... >> 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" <dontlike@spammuch.com> wrote in message >> news:e4ko8g$362$1$830fa17d@news.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 >>> "InvalidateEx" 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.aspx?url=http://dotnet.mvps.org/dotnet/faqs/?id=transparentcontrol&lang=en%3E >>> >>> >>> >>> "G .Net" <nodamnspam@email.com> wrote in message >>> news:JfqdnbvL_-z4fPDZRVnyiA@pipex.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 >>>> "transparent". >>>> >>>> Can anybody help? >>>> >>>> Thanks >>>> >>>> G >>>> >>> >>> >> >> > > 
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