Winforms Flickering While Drawing Image On Taskbar?
Sep 8, 2010
Right now I'm drawing a small 16x16 image on the title bar of my window. It works nicely, except for an obnoxious flicker that I cant figure out how to get rid of. I'm simply drawing the image like this:
Protected Overrides Sub WndProc(ByRef m As Message)
If m.Msg = WM_SIZE Then
wnd_size = New Size(New Point(CInt(m.LParam)))[code]....
Its repainting the entire title bar each time something is changed on it(click, mouseover the corner buttons, etc), and its during the repaint I get the flicker.
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May 18, 2010
I have a form where i put controls at runtime. Everything works fine and fast. I also set the doublebuffer property of the controls to true and then there is no flickering at all. But then i proceed to add an image in the background (also during runtime), but then each item i move is flickering even if i remove all the controls and only leave the background image when i move another form it flickers anyway.I put an example below of how im adding the image.
Public originalImage As Image = Nothing
Private Sub Panel2_Paint(ByVal sender As System.Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Panel2.Paint
If originalImage IsNot Nothing Then
[code]....
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Jun 19, 2012
How can i Minimize the window to the Taskbar?
im using:FormBorderStyle = Windows.Forms.FormBorderStyle.None
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Mar 5, 2012
i have developed a windows application whose interface has multiple picture boxes panels with background images for rich look and also a usercontrol which contains a gridview and WPF scrollbar in an element host. All these controls are placed in one panel (this is also having a background image) which is equal to the size of windows form. The reason for placing all these controls in the panel is that the window can be resized, if needed, allowing scrollbars.
Due to these large number of controls in which some of them have transparent backgrounds loaded in a large panel having background image, the window is flickering when moved or any other application's window is moved over it.
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Dec 14, 2009
I have an image that stretches to the size of my form so if the user resizes the form, the image resizes aswell. All works great apart from the constant flickering during the resize of the image.
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Dec 5, 2010
I have quite an annoying problem and I don't know how to fix it. See I have several panels in one of my forms, all with background images. On the start of the application, the form slides down, and when the form reaches a set value, all my panels slide out.The problem is, when the panels are sliding, they flicker furiously! It's really annoying and I'm not sure how to fix the problem. When the panel reaches it's set value and stops moving, the flickering stops. I can only assume it's because of the background image
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Mar 25, 2010
I'm using .NET 2.0 Windows Forms and want to add "drawing" components such as lines, rectangles, etc.. I've done this before in MS Access, but I can't seem to find similar things in teh Visual Studio 2005 IDE. Where do I need to look to find these elements?
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Aug 17, 2009
With this line...
If PictureBox1.Image = My.Resources._2star Then
I get this error: Operator '=' is not defined for types 'System.Drawing.Image' and 'System.Drawing.Bitmap'.Is there another way to say = with images?
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May 23, 2009
Is it possible to convert an object form System.Drawing.Graphics to System.Drawing.Image?
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Jan 21, 2010
Here is my favicon code
Dim oURL As Uri = New Uri(e.Uri.AbsoluteUri)
Dim favicon As Image
If oURL.HostNameType = UriHostNameType.Dns Then
[code]....
The error is Value of type System.Drawing.Image cannot be converted to System.Drawing.Icon Is it even possible to make the favicon be the icon of the form?
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Apr 3, 2009
im using an MDI parent form and MDI Child. how can i print the image that's inside a picture box that's inside the Child from a button that's on the Parent?when i try to use print preview or print dialog, i can't get it to recognize that the document is the picure inside the picture box. i've looked up this error message:Value of type 'System.Drawing.Image' cannot be converted to 'System.Drawing.Printing.PrintDocument'.[code]
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Aug 11, 2011
I am currently using Visual Studio 2008 (VB.Net) and SQL Server 2008. I have images saved on the database as image. When I fetch it into my code it is a System.Byte[] and I am unable to cast it as a System.Drawing.Image to save to my DevExpress(v10.2).XtraEditors.ImageEdit.
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Mar 4, 2012
I've decided to learn Visual Basic .Net as this is what some of my colleagues work with, and this will allow me to work with them on projects.I have purchased Microsoft Visual Basic 2010 Step by Step and downloaded the sample files. When I am trying to debug the first sample application (a Windows form), it is telling me that it can't load System.Drawing V4.0.0.0. However, if I create a new Windows Form application (C# or VB.Net) this works fine.
I had a look at the References tab in the project settings and System.Windows.Forms is referenced, but the version referenced is 2.0.0.0. I have removed and re-added this reference and it stays at 2.0.0.0 and I still get the error.Does anybody have any ideas as to what may be going on?
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Apr 9, 2012
I am making a web browser using geckofx. I have put the favicon in a picture box but I have changed my mind and now I want it as the form's icon. The code for the favicon is:[code...]
The favicon works fine in the picture box but i think it will look better as an icon. If i change the line Me.PictureBox1.Image = favicon to Form1.icon = favicon I get the error Value of type 'System.Drawing.Image' cannot be converted to 'System.Drawing.Icon'. How can I get this to work?
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Jan 20, 2010
I have a System.Drawing.Graphics g, which draw something in a PictureBox. Now I want to export this pGraphics to a new System.DrawingImage pImage (or Bitmap). But how?
Dim pImage As Bitmap
Dim g As Graphics
g = Graphics.FromImage(b)
[Code].....
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Mar 10, 2010
I have two graphics I'm trying to superimpose into one, then display in a DataGridViewImage cell...The Value property of a DataGridViewImage is an Image type.
Dim Image1 As System.Drawing.Image = imgl_Imagelist1.Images(0)
Dim Image2 As New Bitmap(imgl_ImageList2.Images(0))
Dim DualGraphic As Graphics = Graphics.FromImage(Image1)
[code].....
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Aug 25, 2009
in vb.net 2008 express, is it possible me to specify an image that would be in the background of a taskbar?
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Mar 7, 2012
I've been playing around with Windows 7 taskbar thumbnail previews. I've noticed that some Microsoft applications are able to set thumbnail images which have transparency in background. I've been trying all out and not been able to achieve this.
I've set a picturebox control having PNG with transparency as thumbnail preview, doesnt work. I tried creating a new bitmap and loading from Icon file having transparency and setting it as preview but still doesn't work. It keeps showing the background color of the form window.
This is what Microsoft apps are able to acheive:
[URL]
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Jun 4, 2012
How can I draw an image in a program using visual basic, without actually drawing the image first on an graphics program or on paper?
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May 2, 2010
My objective here is to paint an image onto a certain part of ANOTHER image. So I'm technically trying to copy one picturebox to another one.
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Dec 21, 2009
I am trying to use Bitblt for drawing one image on another. but when i try to get HDC From first image it gives Negative pointer value, so BitBlt returns 0 value. is it possible to get device context from bitmap directly?
[Code]...
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Aug 8, 2009
I have an app that displays images (using picturebox component). what I am trying to do now is to try to allow the user to resize the image how he wants it (scale). for this i think I need to create an instanece (bmp) clone of the selected image in the picturebox and draw it ontop of the original picture; then specifi new set of size points.I was trying to use the code below:
Graphics.FromImage(PictureBox1.Image).BeginContainer('i do not know what to do here')
I need to specifi the new size of the graphics container but I do not seem to have any clue on how to do it.
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Jul 13, 2009
I encounter a problem when I try to save a graphic. Drawing and displaying the graphic is no problem, but when I try to save it on file it always results in an empty image.
My code so far is:
Initialization:
Public Class ImageDisplay
[code].....
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Oct 16, 2009
I want to draw a line on a image, easy enough in principal the image is a map and the lines is between city pairs?
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Sep 28, 2010
I currently have a application that takes a image of the selected area that is set by the user.
I now would like to draw a black box in the section of a image
Top left
7, 458
Bottom right
512, 472
I would like that area filled up with a black box.
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Mar 29, 2011
I have a form in an application I'm working on that normally displays full screen without a taskbar but provide the option to switch to a minimizable window with a taskbar. When I switch from full screen without taskbar to minimizable window with taskbar everything is ok. When I try to switch back to full screen the border disappears but the taskbar is still there and the form is not aligned properly.The text at the top is cut off somewhat and there's a small margin at the right edge that shouldn't be there.I put this code in a keydown event for the form.
If Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None Then
Me.ControlBox = True
Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.Sizable[code]....
How do I get the taskbar to disappear and the form to display properly when I return to the full screen mode?
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Nov 18, 2011
Been experimenting using VB.Net to make a game, Got most of it figured out but now my method of shooting missiles causes a terrible lag, This is how i'm doing it now.
Declares Private missiles As New ArrayList()
Dim canFire As Boolean = True
Fire
[CODE]...
Move all the missiles X positions + 1
Try
For Each pic As PictureBox In missiles
pic.Location = New Point(pic.Location.X + 1, pic.Location.Y)
Next
Catch ex As Exception
End Try
I have a timer making canFire true every second. It is a GIF Image, I tested with a PNG image and the lag is barely noticeable. Is there a better way to draw them while still being able to use GIF images?
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May 25, 2009
i am creating a winform program using vb where i am loading an image into a picture box. then in the mouse down event i am creating small circles which can act as points which will be displayed on the image. say creating five points around the eye of a bird. then i am having a button by clicking it , a polygon will be drawn on those selected circles x and y as edges. i am having no issues until this. when i am trying to add another polygon in the same picture by clicking around its leg or whatever and pushed the draw button there must be another polygon i.e. two separate polygons 1 on eye and 2 on leg. but there is only one polygon from eye to leg. so my questions are
1) how to close a polygon and draw another one in picture box
2) how to select a previously drawn polygon and delete it.
picturebox_mousedown
Private Sub PictureBox1_MouseDown(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles PictureBox1.MouseDown
[code].....
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Jul 20, 2011
I have 4 control 3 button and 1 picturebox
vb.net
Private sub Button1 Dim bm As Bitmap = New Bitmap("D:Trening4 - Copy.bmp"
[code].....
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Oct 18, 2010
My goal is actually very simple: I simply want a (shared) function that accepts a List(Of String) which creates an image and writes those strings (line by line) onto the image. There's a bit more to it than that, but for the sake of example this is all you need to know.Usually when drawing on an image I would create a Bitmap object and get the graphics object from Graphics.FromImage:
Dim bmp As New Bitmap(100, 100)
Using g As Graphics = Graphics.FromImage(bmp)
g.FillRectangle(...)
[code]....
Seems easy enough, but the problem is that I don't know how many strings there will be in the list, nor how long they will be. The image should 'scale itself' according to the strings in the list. If the list contains 5 strings it should be 5 strings high (plus a little extra for borders). If the list contains only 1 string it should be only one string high. Same goes for the width, if the longest string is 150 pixels, the image needs to be at least 150 pixels (160, 170 or something).
This is all good, I can get the dimensions of the strings by using Graphics.MeasureString. The problem now is that I need the dimensions of the image to create the bitmap. I need the Graphics object to get the dimensions. But, I need the bitmap to get the Graphics object I'm stuck in a loop here, if I don't have the Graphics object (I can't create it from nothing..) then I cannot measure the strings, but if I cannot measure the strings then I cannot determine how large my image will be, so I cannot create a bitmap and associated Graphics object...
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