Why doesn't the scrolling function (below) work for the sine wave as it does for the FillEllipse function? Thanks for any help. Please pardon my crosspost to Controls - wasn't sure which forum would be best to post to. Steve public class CustomScrollCtrl : System.Windows.Forms.Scrollabl...more >>

Hello Group, I am using the GDI and GDI+ Together. Now in my old code I've setup a clipping region for my GDI Canvas, then I draw something with GDI+ on it. Does the clipping region affect the GDI+ as well so that only the required region is drawn or do I have to "reset" the region for the GDI...more >>

I have an image object of which I want to perform a high quality resize and create a new Image (don't want to draw it to the screen). I have tried using Image.GetThumbnailImage but the quality of the image returned from this method really sucks. I know there must be a better way to handle t...more >>

If I load an image using Image.Load(), and then call Image.Save() to save the image back out with a new filename, will the image be saved in its original format or do I have to explicitly add the ImageFormat argument to Save? -- ----------------------------------- Ken Varn Senior Software ...more >>

If I want to support different format of image, should I derive a class from System.Drawing.Image? But the Image class marks the default constructor as internal. Any ideas? Thanks, Tong...more >>

Hi.. Please suggest me some way to draw on title bar and add new Button to title bar. If possible give demo code. Thanx ...more >>

Hi everybody I'm working with TIFF B&W images in C#, for best performance I'm using GDI instead of GDI+. I'm using BitBlt and StretchBlt. The problem is that when I "paint" the image with StretchBlt or BitBlt the image is not "Smooth", when I "paint" the image with DrawImage the Image is "...more >>

I wrote an application in vb6 to save certain items is twips. I would like to convert those items that were saved in a Twips format to Pixels. Is there a function or a way to convert Twips into Pixel? thanks in advance......more >>

Hello, I'm writing in C# and have developed a panel control that contains a matrix of pushbuttons. It seems to work fine until you pull a modal dialog over the panel. Then drawing goes berserk and you get garbage, so moving the dialog around causes the display to look very bad. I've trac...more >>

Hello. How to determine that a loaded Bitmap is grayscale ? I am loading a grayscale JPEG using System.Drawing.Bitmap.FromFile() and PixelFormat property is Format8bppIndexed. It's strange to me, that there is no something like Format8bppGrayScale in GDI+ (there is only Format16bppGraySc...more >>

Hello all, I'm a newbie to programming and my question is: For what is it good to draw with float values in graphic routines since pixels are always integer. Also I have tried the following code and ask myself if this is correct: class F1 : Form { protected override void ...more >>

Hi, I'm not doing this for any particular reason, but was just playing with specialising windows controls. It's driven me mad... I wanted to create a control, derived from System.Windows.Forms.Panel (though, i started with System.Windows.Forms.UserControl) that fills itself with a gradient. ...more >>

I wish to use GetThumbnailImage method of Image object to downsize an image but I don't want to use embedded thumbnail which can be in original image file. I know probably it isn't best in the world way but I like it. It works absolutely fine for my purposes. It is very simple. It works...more >>

Folks, I have an image of a circle, which I am trying to straighten out into a flat line. I am essentially wanting to look at the image, and read a straight line from the centre, and then plot this on a graph. Then I want to rotate the image 1 degree and read the next line down, if yo...more >>

Hi everyone... does anybody have any sample code for drawing vertical text in C# using Win32 GDI? I need to properly dispose any memory allocated too. I was able to draw horizontal text with this code: IntPtr hFont = font.ToHfont(); IntPtr oldHFont = NativeMethods.SelectObject(hdc, hFont);...more >>

That's all we are expecting from programs written in the managed code; Though a MVP advised not to say that, because after JIT compilation the code runs in the native! Funny, isn't? That means scripting languages run in the Host code and never in the native? That means scripting languages are po...more >>

Hi, another very strange behaviour with ellpisis and the DrawString method. If I display the string "This is a string" with no ellipsis, there is a certain gap between words. Let's say 6 pixels between "This" and "is". If the bounding rectangle is smaller and ellipsis appear, the gap between ...more >>

Hello, I would like to details regarding the conversion of Jpeg to Xerox datastream (Line Conditioned Data Stream) format. or pdf to Xerox datastream (Line Conditioned Data Stream). Anyone's help will be appreciated Thanx in advance Niraj Ranka ...more >>

I'm pretty new to dotnet; sorry if this is a FAQ but I've reviewed usenet and the FAQs I could find without success. I'm drawing fancy windows - funny shapes that resize in odd ways - and have the Region generation down pretty well, but my Region is clipped to the Form's boundary rectangle. ...more >>

Hi, I come from the MFC world and I can't get the same behaviour I add in my old app with a new dotnet app written in C#. I have a rectangle with a string inside and the user can drag the mouse to shrink the rectangle width. While shrinking, a string "abcd" is progressively displayed as: ...more >>

Does anyone know how to create a list box that has lines for every item. like so: _______________ |______________| |______________| |______________| |______________| Thanks, Brad Shook ...more >>

I’m trying to draw a quarter of a doughnut using a graphics path. I add two parallel arcs to the path and then close them. When I draw the path I do get the quarter, but there’ a parasite line that connecting the two edges of the inner arc. What will be the way to draw a clean quarter? ...more >>

Hello When i enter or leave a picturebox with the mouse's cursor the pic redraw itself and all the image inside it flashes!!!! Does anybody know how to avoid this problrmm (bug)??? Thanks in advance...more >>

Maybe Bob can help me out on this one. I am developing a photo album application and want to use tiff images as a sort of container for images that look the same. Anyhow, I was looking at how GDI+ deals with tiffs and I found out how to paint the image onto another canvas, but not how to a...more >>

Hi all i'm doing a form that i paint on the event onpaint. And i want to make all controls in that form to become transparent in the way i can see the form background is it possible how ?? thks JSB PS: any sample !!! ...more >>

How can I take an image and print it scaling it to fit on a page? E.g. if the image is bigger than a page, I want it to shrink to fit the page, if it is smaller than a page, I want it to grow to the size of the page? My problem is that I have a picture box with an image in there (I can set i...more >>

Hi all Does anyone know how to make the mouse cursor of the picture box jump from one grid point to the next with in the picturebox? Thanks Sam ...more >>

I have a two page TIFF document. I simply want to create an array of image and put the two pages of this multipage tiff in this array for some further processing on seperate "images." The problem is that i can use the image.selectactiveframe to get to the individual page, but everytime i tray...more >>

It seems a little odd to me that the matrix set in ImageAttributes.SetColorMatrix is not being used for matrix multiplication in Graphics.DrawImage on the pixel values. In particular the matrix, Dim mx As ColorMatrix = _ New ColorMatrix(New Single()() _ {New Single() {-1, 0...more >>

I know that's an old dirty issue; GDI+ almost -the slowest part of the framework - has bothered many developers using it in animations. Even in managed C++ the performance is awful. Now, any dude out there does know any thing about this issue in VS 2005 + ..NET 2.0 ? Has Microsoft solved this pe...more >>

I have the need to draw on top of an existing Windows application, and if the window is not maximized I also need to draw outside of the window frame. However, I need the existing Windows application to remain activated. my first attempt at doing this I created a transparent form, maximized i...more >>

We have a vendor that is providing us with GIF images that we need to convert to another format. The problem is that when I load the image from this vendor into a bitmap object I get an "Invalid Parameter" exception. Any other GIF seems to work fine. These images appear to be GIF87 images if...more >>

I'm working on a project where I want to simulate the Windows XP functionality when the user changes their color scheme - the window gradually transitions to grey, and then the new color scheme is displayed. I have basic groups of color schemes in my app, and I'd like to provide a bit more "pop"...more >>

When I use the MeasureString method of the [Graphics] object to determine the size that a string will take up when rendered - the method returns a Size that has a width slightly narrower than the actual string. By this I mean that if I paint the string within the returned size bounds it fal...more >>

Hi, I need some help in how to get started with creating a transparent image from two bitmaps. The first image is the image to display, the second image is a mask of the first image for the area that should be transparent. How do I combine the two images to form a gif or tiff that has the...more >>

I am looking for a solution to create a Movable Transparent Panel in C#. I have found several solutions to the Transparent Panel problem that suggest overriding OnPaintBackground and then doing nothing. While this approach works for non-movable panels, such an approach does not work for ...more >>

Hi! Can u please tech me a way to know if the image in the picturebox has changed? what event should i catch the chage? ...more >>

Hi, I am trying to convert some 16 bit greyscale images from their own proprietary image format to bitmap format. I'm creating the bitmaps using PixelFormat.Format16bppGrayScale, but the actual size (in bytes) of the resultant bitmap appears to be twice the size it should be (it seems to be...more >>

Hi, I am using richtextbox for an application. I am working with c#. Is there a way to find how many characters can fit in a textbox line? One way that I had thought was - richtextbox1.Size.Width/richtextbox1.Font.Size; But this does not seem to work. Please help me out. Thanks and ...more >>

Hello, I have an ASP.net project that gets posted to by a flash object. For the past month everything had been working fine, but in the past day, the page refuses to load. I basically through response.write("here") to figure out where it was hanging and it comes doesn to this: Private...more >>

Hello , I want to Create an image from a URL. I mean , Convert HTML Page to TiF Or GIF . Someone have any Idea or example. Thanks Nir ...more >>

Hi all, I have searched many times to know how to fade away a message box in visual basic .NET, I would be grateful to you guys if anyone helps me.. ...more >>

Hellow, i am working with vb.net, Is there a function that can give me the panels width and height in pixels?? (such as GetDeviceCaps) Ofir. ...more >>

Hi group, I got the following piece of code which draws a square with stars round it, now I want the stars to rotate round the square, I can do this with the mx.rotate and a timer and an angle, but this rotates the whole drawing of the stars but what I realy want is for the stars to rotate r...more >>

Folks, I have a scanned image which is circular, and contains a trace in the middle of it (for those of you familar with trucks it is a tachograph chart!). I want to "flatten" it out, into a straight line. I can't seem to find any controls which might be able to do this for me. ...more >>

Hello, I have the following code: image = createImage(sType) image.SetResolution(300, 300) g = Graphics.FromImage(image) textFont = New Font(fontFace, 8.0F, FontStyle.Bold) g.DrawString(sText, textFont, New SolidBrush(fontColor), _ New RectangleF(outRect.X, out...more >>

How can I get the Hdc of screen in VB.net or C#? It seems to be strange in VB.net!! I know in VB6,I can use getdc api to get Hdc of screen,but in Vb.net no such a function. even under the graphics class the getHdc() is invisible to the programmers. Any ideas? Thanks in advance!!! -- WH...more >>

I am writing a small app to convert Group4 tiffs to Group3. I also need them to be big endian for my system to accept it properly. I have gotten everything to work except for the byte order. I have searched every newsgroup I could find and nobody seems to be converting from little to big ...more >>

Dear Ng, If I click on a control at runtime, i want to show the properties of the control in a property grid. But not all, just a few, which are interesting for the user, like background color, etc... How can I do that? I don't want to overload the user with properties he will never use and...more >>

Dear Ng, I still have my Control Selection and Resizing problem in my "visual studio like" form designer. The user should be able to add and move around controls at runtime. When he clicks on it, he should see the the selection frame and the grab handles to resize the control. Can anybody h...more >>