Hello, I'm trying to create a 256 color paletted based PNG image, and am amazed at either how difficult this is, or how stupid I am. Any pointing in the right direction would greatly be appreciated. Since creating a bitmap using Format8bppIndexed, you can't use SetPixel, what are the optio...more >>

Hi all, I need to have a arrow move from one control to another? How do I draw a arrow on the screen on top of one control and then move it to the middle of another control? Always appearing on the top. thanks for your help Gerry ...more >>

(Type your message here) How to make one color transparent in Image through Vb.Net for a vba application .The Image is on the word Document and i have to make one color transparent through .net coding. Any idea Pls Help!!!! -------------------------------- From: Vivek Gupta ----------------...more >>

Hi, as far as I know the gif image format is still not free and developers have to pay a fee if they dont want to infringe the copyright. Therefore I was surprised that .net provides a gif-converter in the GDI+ (Image.Save [...], System.Drawing.Imaging.ImageFormat.Gif). Because of the licen...more >>

I am drawing a contour plot, which is currently grey scale, using all 256 greys. I would like to try using colour instead, but cannot determine a suitable color scale (for instance if I use all colours between 0 and 16777215 it looks very bad). Can anyone suggest possible colour scales I might...more >>

I have big performance problem with drawstring! I draw lots of strings in a panel window, memorized in a matrix= rows,columns=2E Every time it needs to repaint all panel (using= invalidate method), the update is too slow=2E I've already used= double buffer to avoid flicker, substituted Pan...more >>

Hi. I would like to have a blank place with points every X pixels, where it would be possible to draw/place components. A little bit like the GUI of VS. I have to be able to draw a circle or wire between components. And possibility of zoom. Do you know anything that could be used for it? ...more >>

All, I have a PrintDocument that has 2 pages. The 1st page needs to be Portrait and the 2nd page needs to be landscape. Inside the PrintPage() event, I've tried setting the e.PageSettings.Landscape property, but it seems to have no affect. The page remains Portrait. It appears that the ...more >>

Hi all, How can I draw a single pixel with the graphics object? Lines seem to be a minimum of two pixels, rectangles too. Is there a method for drawing pixels? If the answer is obvious forgive me I'm new to this. Thanks in advance, Martin. ...more >>

I can't seem to find a news group called microsoft.public.dotnet.framework.vb there are csharp and asp but howcome not a VB?? is there any way to get one?? and how can I get one if there is a way?? Regards Richard ...more >>

Hi, I'm developing a C# windows application and facing flickering= problem=2E I've tried using double buffering by drawing to a= bitmap first before drawing to screen=2E That solves part of my= problem (those that I manually draw to the screen) but not all=2E= I still find those child con...more >>

Hi I am having a custom Tab control. In the Control's designer class am adding the follwoing code but it is not working i am still able to drag and drop a button or other controls on tabControl. But it works if I drag and drop a control, say button on from, and hten cut and try to paste it on my T...more >>

I am creating a drawing program as part of an application I am making and have run into something I just can't figure out. How can I make a nice anti-aliased eraser? My current erase just uses CompositingMode.SourceCopy with a 0-alpha pen to draw transparency onto the existing image. This wor...more >>

how can I extract an icon from a fil for example this sentence "F:\WINDOWS\System32\shell32.dll,3" how can I extract icon nr 3 from the shell32.dll?? regards Richard ...more >>

I discovered something curious today. By accident I wrote (I'm using VB): System.Drawing.Color.Blue.Red instead of System.Drawing.Color.Red and it still worked! It gave me a Red color. I would expect to see an exception like: Red is not a member of Blue. Does anybody know if it is su...more >>

Is there any way of sending special escapes to a Windows Printer driver using .NET? Paul ...more >>

Hi there, i'm a newbie to GDI+ programming and am try to draw a cannon. The cannon is drawing ok with the below code, however when i try to rotate the cannon, the cannon rotation is not about the origin. What i'm try to achive is the the cannon, its, turret, and its shot should be able to rot...more >>

All, I am working on a image printing application for internal use at my company. What I'm needing to be able to do, is basically print any size image to any size paper, scaling the image to "Fit" the paper. The kicker is that I must maintain the image's apect ratio (Image.Width / Image.He...more >>

How do you access properties of a JPEG using VB.Net? When you right-click a JPEG, choose Properties, and click on the Summary tab, you can manually enter the Title, Subject, Author, Keywords, and Comments. But how are these specific properties read and set in VB.Net? Let me know if I need to post th...more >>

Hi Im not sure this is right group, but i will ask my question. In a student project, i need to make a small drawing application in C#.NET. The requirements are that it must be possible to draw text and to group different texts by drawing a frame with a visible label around the text. Other fu...more >>

Hi, Can any one please explain this? I am filling a rectangle using a linergradient brush, but sometime brush wraps around e.g. if I do vertical gradient from clr1 -> clr2 sometimes top line of rect has clr2. This is the code i am using <code> CPaintDC dc(this); Graphics graphics(dc.m_...more >>

Hello, i want to create a transparent overlay drawing that pops up temporarily. As I don't have anything like Swing's GlassPane, I created a new Form subclass that is transparent, and draw in this Form class. Works beautifully. With the exception that there is a short flicker when the Form co...more >>

I use a GraphicsPath to generate a Region, which is then used for hit testing. The problem I have is that when I use GraphicsPath.AddPolygon, the region I get is hollow, so any hit testing inside the polygon fails. Is there a way to fill the interior of the polygon path, the same way in which...more >>

Hi, I have a question: How do you load an embedded bitmap resource in C#? I have tried the following but it doesn't seem to want to work: Module mod = Assembly.GetExecutingAssembly().GetModules()[0]; IntPtr hInst = Marshal.GetHINSTANCE( mod ); bmToolbox = Bitmap.Fr...more >>

Another newbie question If I understand correctly the COLORREF holds a DWORD type which is basically a uint in C#. I now have a color structure I need to get the old style COLORREF into. However my number is to large (16,777,215). So when I use the Sytem.Drawing.FromArgb my colors are maxed out ...more >>

I'm having issues writing text to a tiff file. However I have no problems saving text to a Bitmap Here is an example of the code that works with Bitmap Dim objBitmap As New Bitmap(600, 600 Dim objTextBrush As New TextureBrush(objBitmap Dim objFont As New Font("Verdana"...more >>

I need to use the LOGFONT structure every once in awhile in an application I have written. Currently I am using the FONT class under the framework and need to use the "ToLogFont" method of this class. I have been unable to determine how to get the structure "LOGFONT" from within my application to f...more >>

Hi There, After dicking around with Crystal reports Pie Charts and not being able to get the control to do what i wanted, I decided to write my own basic 3D pie chart control. It works fine except for segments that start above 90 degrees and below 180. For segments between 0 and 180 i am us...more >>

I have an arbitrary triangle that wish to draw filled. I would like to fill this triangle by specifying the colours at each vertex on the triangle, then having a linear fill gradient between these vertices. Can anyone tell me how to do this? I have looked at the LinearGradientBrush, but this o...more >>

Hi * I've a simple question but it makes me crazy that I can't find a solution. How to draw a line that reverse the background of my control. I may use ControlPaint.DrawReversableLine but then I cannot use special pen. Any ideas? Best regards, Torsten ...more >>

have 2 layers of related graphics that I want to display. The bottom layer is relatively expensive to render and stays static. The top layer displays some user-orchestrated animation, directed via the mouse- similar to a drag-and-drop operation. I've tried laying one control over the other. T...more >>

Opinions needed - is VB.net good enough to create a proper vector drawing program with some bitmap processing, i.e. does it have a rich enough feature set, and do the compiled programs run fast enough for a commericial release? Or do you have to use C#, maybe even C++ (more difficult languages I pre...more >>

Hi I have an ASP.NET where users can upload images to the server. I've already implemented business logic that checks the file extension of the files uploaded to make sure they are of an acceptable image type. However, it occured to me that a devious user might simply give some non image (Like...more >>

Hi I need some documentation about "multilevel undo" in programs of image elaboration. Thanks ...more >>

Looking at the list of codecs for GDI+ Bitmaps, from ImageCodecInfo.GetImageEncoders(), there doesn't seem to be an EXIF codec. Does anyone know why - is EXIF not supported? How do you set the encoding parameters for an EXIF? Dom...more >>

Hi All Am having a custom Panel control derived from Panel. I am drawing only a 6 pixel border on the panel to give it a frame effect. But the problem is tht when I am using my custom Panel control to add a control on it and set the dockFill property then the added control is filled over the comple...more >>

Please, can someone help me - I'm beginning to go crazy! I'm writing something that does some drawing on a picturebox. The problem is I don't know when to redraw my image. I made a post a week ago, but have yet to find a solution. The problem is that when a dialog box gets minimized or clo...more >>

Hello, I'm developing a custom windows forms control which needs to support transparency... By following the GDI+ FAQ by Bob Powell I could make my component transparent...In this method, I can paint, let's say a text, with solid brush over my control and it works great... Now, I want to...more >>

Hi In my vb.net Installer class, I check the InstalledFontCollection for myFont, if it isn't there I try to install it using the GDI function AddFontResource. I am getting the following error and don't know why: "System.EntryPointNotFoundException: Unable to find an entry point named Add...more >>

I want to make a simple form with a few textboxes and buttons. I also want to set the opacity of this form to something other that 100%. When I do this, the buttons and textboxes are also made transparent which I do not deisre. Can I make the form less opaque without affecting the controls o...more >>

We are implementing a large gui project with all custom UI components. Many of these components have to take on the background of its containing component due to irregular shaped buttons and labels which we need to use a common panel-spanning background image Currently we are setting these compon...more >>

Hi I have an ASP.NET app where users can upload images to the server (that's no problem), but after that then I need to do some image manipulation. I need to take the image and do 2 things: 1) Resize the image to a certain standard size and save that 2) Make a thumbnail of the image and s...more >>

Hi, This is a clarification of a previous problem I posted a few weeks ago, which is still giving me trouble. Cloning an image using Bitmap.Clone() works fine when using images created in managed memory. The bits are properly duplicated, and modifying the Cloned image will not affect the Cl...more >>

All, Does anyone know how to determine the color resolution at runtime? For instance I need to know if the users screen is set to 256 colors or 16 bit or 32 bit color. I know you can get the screen resolution using the System.Windows.Forms.Screen object, but have yet to find a way to get the ...more >>

Hi I use the ScaleTransform(float h, float v) method and i pass the graphics object to a function. How can i retrive h and v inside the function? thanks ...more >>

Hello, I am looking for a way to find diffeences between two images. I have two images, where in both images there is the same picture / structure / whatever. In the second picture, there is some additonal information including the picture from the previous image. I need to extract this addit...more >>

Hi all, I'm creating a control derived from System.Windows.Forms.Control I override the OnPaint() method. In this method, I need to draw a string in an area. This area is a rectangle (called fRect) I want to display a text centered vertically. I used MeasureString, but the result is not alwa...more >>

I read your article on your website about creating a transparent control. Is there anyway to alter the amount of transparency using your method? -- Chris To send me an E-mail, remove the underscores and lunchmeat from my E-Mail address....more >>

ASP.NET - VB - VisualStudio.net Enterprise Whereas: most windows bitmaps are 24bit RGB or 32 bit ARGB, and whereas: I have an app that MUST have a single 2byte word for each pixel in RGB565 format. How does one do this in a webapp? I have tried the .clone method to see if that converted anything...more >>

If I have a form with a background image on it and then place a panel over it, I can make the panel transparent by setting it BackColor property to include an alpha component. For example, If I set the BackColor (for example) to 128,255,0,0, it is a nice transparent red panel and I can see the ...more >>