Hello. I'm using Visual Studio 2005 (VB) and I want to a draw a pixel to an (x, y) position on the form (is drawing to something else faster or easier?). Here's the catch; the pixel needs to have an RGB color value, so using System.Drawing.Brush is not an option, since you can only specify n...more >>

Hi, I recently found a thread where Frank Hileman suggested using the Bitmap overload that enables you to get direct access to the image byte-array, opposed to using unsafe code along with lockbits. I've written a small wrapper for this functionality and its working ok. My question is, how ...more >>

I am using .Net 1.1 I am facing a problem with my GDI++ code in C# control. Though i have tried many things from last 6 months, i am not able to get completely rid of this bug. Whenever the user is opening a window or closing a window, i'm getting following exception. This is a very ra...more >>

Hi, I am writing a realtime scientific graphing library for use in a=20 Windows.Forms application. I am using all the usual tricks to get=20 decent performance, yet the performance is still less than optimal. It=20 is ok for graphs that update about once per second, but I would like=20 to the...more >>

I've noticed that Drawing.Graphics.TextRenderingHint = ClearTypeGridFit does not seem to be used when StringFormat.FormatFlags = DirectionVertical. This is best seen by running the following example: Public Class Form1 Inherits Windows.Forms.Form Protected Overrides Sub OnSizeChang...more >>

Did anybody come up with a definite answer for this? Any fixes? EggHeadCafe.com - .NET Developer Portal of Choice http://www.eggheadcafe.com...more >>

Hi, I'm trying to draw a rectangle around an image but for some reason for the life of me I can't figure out why the rectangle is not drawn the same width as the image any ideas? using(Image newImage = GenerateBitmap()) { Rectangle srcRect = new Rectangle(0,0, newImage.Width, newImage.Heigh...more >>

I generally work with large scans, so speed matters for me. I wanted to set transparency for colors whose RGB byte total is less than 10 (light colors). I tried the Bob powell method listed at: http://www.bobpowell.net/lockingbits.htm which locks a source and dest bitmap, then writes to the de...more >>

Hi , I get an exception when using 'Pen.DashStyle = DashStyle.Dot' in my pen method. I have a pen as instance member of a class and set its dashstyle in the paint method. Can anyone please give some input on the same. Regards, Sanjay ...more >>

I've been studying all the articles I can find on GDI+, and putting together a function to convert image colors and types. I am finding that I can quantize an image to 8 bit colors, and then save to png format perfectly with: bitmap.save(filename, ImageFormat.png) When I do the same thing to jp...more >>

Im trying to print a tif file with size 975x839 with resolution 300x300. Im printing this onto a virtual printer which takes a size of 1720x2200 200x196 dpi. Im using the following code image.SelectActiveFrame( &pageGuid, i ); graphics.SetPageUnit( UnitInch ); graphics.SetInterpolationM...more >>

Does anyone know a way around this? Do I need to write my own transform code? It appears that SmoothingMode doesn't apply to matrix transformations (in my case shear). The following code produces shearing with ugly stepping: viewPort.Graphics.SmoothingMode = SmoothingMode.AntiAlias; M...more >>

How do I print (on the top) or on the right side of pages that are drawings? Drawings are in landscape style format. I need to set printing to the top of these drawings....more >>

Are there any samples or documentation on how to draw the background for the Office Button (i.e., the button that replaces the File menu) in Office 2007? I really like the glossy look of this item in Office 2007 and I want to implement a similar looking item in my app. Thanks for any help!...more >>

Hi all... I have developed an application for managing a very large resource of artist's paintings and posts them to a web site. The application works well. I'm trying to reduce the complexity of having to work with photoshop and integrate one feature into the application > Distortion Trans...more >>

Hello, I have to developed a image library like ACDSee in which i have thousands of images of different extensions including PSD and AI. Library will display the images in thumbnails and then user can click on a thumb nail to preview the orignal image I want to ask what will be the pros &...more >>

Hi, I know that Gif images have an indexed pixel format, However it is possible for Tiffs and jpegs to also have this format? Thank you for your time. Regards, Jim. ...more >>

Hi. I have the following code to draw an ellipse to a metafile: Metafile Metafile; using (Graphics gr = Graphics.FromHwnd(IntPtr.Zero)) { IntPtr hdc = gr.GetHdc(); Metafile = new Metafile(hdc, new Rectangle(0, 0, 300, 200), MetafileFrameUnit.Millimeter, EmfType.EmfPlusDual); gr.ReleaseHdc(h...more >>

Hi, I have a problem with memory when trying to load more pictures ..... So what I do is , I load images into PictureBox and keep them there for further processing ..... so user can see, select, add etc .... For testing I'm loading 1.3MB tiff's ... Now the problem occurs when I try to ...more >>

Hi, I'm currently designing a user control that will draw some graphics like rectangles and such... The control can select the drawn rectangle and move it. The thing is, a control is a rectangle and cannot be rotated, so if my drawn rectangle is rotated 45 degrees, the bounding rectangle (th...more >>

Hi all, I'm developing some lab software in VB.NET that talks to instruments. One of these can give me its screen image as a bitmap, but the interface software I use requires that I ask for this as a byte array. Is there some way to treat this byte array as a bitmap object? I'd like to displ...more >>

private void pictureBox1_Resize(object sender, EventArgs e) { int w = pictureBox1.Width; int h = pictureBox1.Height; pictureBox1.BackgroundImage = new Bitmap(w, h); pictureBox1.Image = new Bitmap(w, h); Display(); } In this piece of code a Resize event is triggered agai...more >>

[C#, Windows Forms, .NET 2.0] Hi, I have a double buffered form with a TrackBar, some Labels, some Buttons, some NumericUpDowns and a ListView. When I call Refresh method of the Form, I see flicker on TrackBar and ListView. Why Flicker occurs on this two controls while Button, NumericUpDow...more >>

SVG Graphics allow text to be drawn around curves etc (like work art) and send them to internet explorer and firefox .. etc. neat, but not 100% client side robust like .jpg and .gif Can you; - Do something similar in .net - or read and convert svg to bitmap in .net -- David Bray ht...more >>

Hi everyone, Any ideas how to overlay a GIF with transparent pixels onto another GIF using GDI+ ?:) thanks, Andrew ...more >>

How do I read a color in a picture box? My picture box di not contains an image. Thanks a lot!...more >>

I have a window to which I'm rendering a lot of (images, text, rectangles, etc). The total height of everything rendered could end up being thousands of pixels, and I want the user to be able to scroll down to see them all. I'm using Bob Powell's Autoscroll tip inside my Container_Paint event: ...more >>

Hello, is it possible to create a Bitmap from a graphics object?...more >>

Hi, I've read a lot about gradient, but still have no idea of drawing an image like this link below. http://hiphotos.baidu.com/futuremaster/pic/item/0d06424340ba36109313c6ec.jpg Any help is appreciated. Regards, Anderson ...more >>

Hi , i would like to know how to implement the following (from office 2007) in my app from scratch(extending is fine , i dont wanna buy any 3rd party control) Equations: word 2007 has support for math equations -> http://gidsfiles.googlepages.com/word_equation.jpg http://gidsfiles.googlep...more >>

Hi there, I have also posted this in the vb group but not had any luck as of yet, I have been trying to get the GradientFill API working as no doubt it is faster than the .NET GDI+ equivilent (as with all the graphics API. I now have this.... (which doesn't work also)... Even...more >>

Hi, I got problem, kindly please help. Thank you error message: An unhandled exception of type 'System.NullReferenceException' occurred in Test.exe Additional information: Object reference not set to an instance of an object. with following code -------------------------------------------...more >>

Is there a reasonably easy way to find the position of a Bitmap in a PictureBox? With the PictureBox's AutoSize property set to Zoom, it doesn't seem like there would be any way to figure it out, at least without knowing the zoom factor, and even then, there doesn't seem to be anything in e...more >>

I have a simple question, I found this code in order to make thumbnail from an image. Then I added the function FillRoundedRectangle in order to make rounded corner found in following thread. The problem is that rounded function is ignored, if I delete the next line of code (g.DrawImage......more >>

Assume you are running Visual Basic 2005 Express. You want to write a Winforms program in which you draw a few simple vector graphic objects (such rectangles and circles) and then manipulate them with the mouse. By 'manipulate' I mean move them about the screen and change their dimensions ...more >>