hi, The Graphics class does not provide a DrawChord method. So what is the easiest way to implement something like DrawChord(Pen pen, Rectangle rect, Single startAngle, Single sweepAngle)? Another question is GDI (not GDI plus) does not provide a method to draw a chord with angles...more >>

hi all. i have a large bitmap that i display in my main window. as part of my app, i need to constantly update differnet areas of this bitmap with new small bitmaps. what is the best way to do this? assaf ...more >>

I have a need to save a windows bitmap file in ONLY 8-bit color from a 24-bit Bitmap object. I tried grabbing the BMP imageCodec object and creating an EncoderParameter for the Encoder.ColorDepth parameter specifying a value of 8, and using these in the Save(...) operation, but it still saved t...more >>

hi all i am porting some code from C++. i have two bitmaps. i am using BitBlt to transfer pixels from one to the other. now, in dotnet, i have again, two bitmaps, but i don't know how to transfer pixels from on to the other. so what exactly to i do? assaf ...more >>

Hello All, I've been working on this for several days now and could use some direction so thanks in advace for any help. I have a COM method which needs "the handle to the device context for the bitmap." I'm guessing that it's expecting a DIB but I'm not certain. If so, how do I create a D...more >>

I created a image with true color : mapimage=new Bitmap(mapwidth,mapheight,PixelFormat.Format32bppRgb); and then use DrawImage to draw some dozens of gif file on it, but some colors lost, I think the image has enough colors. Any idea? Thanks! ...more >>

I am looking to spice up my app with rich controls and eye-catching color depth, but I am not a graphic designer (I am programmer who can't even color coordinate my own clothes). Are there any books out there like a GUI design guide? GDI+ and DirectX allow for some great looking gadgets, but i...more >>

I found some images have text that draw by two color, for example, one purple pixel and then one white pixel, the background is purple, so the text kind melt into the background, make it look not so strong. How can I draw such text in C#? I am thinking about some kind of mask, but not sure, any ...more >>

Hi, I'm writing a small graphics program, a sort of scribble pad. I need to be able to save a graphics path. I think my question is how do I serialize a graphicspath. I want to do something like this... Dim FileStream As Stream = File.Open(pstrFileName, FileMode.Create) ...more >>

When i create a graphics using CreateGraphics method from Form class everything is works right with my FloodFill method. But, when i creat a graphic using Graphics.FromImage(b); (my bmp) ALL bitmap is filled with the especific color. How do i solve it ???? _______________ procedure ...more >>

I've started investigating how to draw an image cut out with a mask (like photoshop's channels). I've been looking at Bob's GDI+ FAQ article entitled "Region from Bitmap" (thanks Bob!), but here's the problem. From my understanding of what's going on here - a [Region] is being created, which ...more >>

Im trying to make a software in VB.NET that is supposed to handle high-res images, ive discovered theres a limit in the size of the bitmap object around 10000x10000 pixels. The program takes 3 input files and then create new files with parts of the input files. so basicly i load the inpu...more >>

Hi all, I searched for this for a long time, found nothing so far. I have a Bitmap object in memory, with some content - this bitmap is then displayed on screen. I have a brush object (hatch/texture/etc. - I need all of them to work) which I want to use to paint an area of the picture usin...more >>

I've got a button on a form with the following click eventhandler: private void button2_Click(object sender, System.EventArgs e) { Font tempFont = this.label1.Font; this.label1.Font = new Font(this.label1.Font.FontFamily, 8.25F); tempFont.Dispose(); } If this code is executed twice (tw...more >>

Hey Bob, I've been doing some image flipping as per the sample on your GDI+ FAQ (http://www.bobpowell.net/drawing_an_image.htm) Specifically: Rectangle dest = new Rectangle(10,10,100,100); Rectangle src = new Rectangle(0,img.Height,img.Width,-img.Height); g.DrawImage(img,dest,src,Gra...more >>

I have written a screensaver application in C# .NET and have noticed that whenever the animation loop is running - CPU usage always spikes up close to 100%. My application uses a paint thread which is set at 100ms. the program looks sort of like this: // constructor public Form1() { I...more >>

Using ProgressBar.Enabled = false does not dim the progress bar. There must be a way. I hope somebody could guide me. Thanks. ...more >>

What're the system colors for foreground and background of a disabled control? In fact, the foreground color of a disabled combobox (128, 128, 128) is not among SystemColors. Is there no standard for it? ...more >>

Hi all! I'm really freezed by this problem. I'm creating a Bitmap from a Jpg-File on a network-share using the Bitmap-class. It really works fine but on one server, i get an "Invalid Parameter Used"-Exception when calling Bitmap b = new Bitmap(path_to_jpg). Here's the code-sample: .... Fi...more >>

Hi, I draw some rectangles for some purpose, but all of those appears behing controls such as groupbox, panel. I want my drawings to appear on top. How can I make it? Thanks. ...more >>

Hi All, I'm trying to use the GetImage method in a ASP.NET project that I've created but I keep getting an error stating: The name 'GetImage' does not exist in the class or namespace ... The project includes System.Drawing and I've even tried specifying the fully qualified name System...more >>

Hi all, I've created a GraphicsPath using some fixed data points that make a jagged line. This jagged line is smoothed using the AddClosedCurve() method that creates a cardinal spline curve, which is basically a series of curves, each one defined by four points (start, end and two mid poin...more >>

I can't make Graphics' "native" points transform work the way I want it. This code achieves the desired result: Point pt1 = new Point(e.X, e.Y); pt1.Offset(visibleX, visibleY); PointF pt2 = new PointF(0, 0); pt2.X = (float) ((float)pt1.X / scale / pixels_per_mm); pt2.Y = (float) ((float)pt1....more >>

I'm just wondering, in regards to animating a sequence (for instance I'm looking at creating some sort of visual transformation between states wtihin the control - like sliding things around) what's the general approach to take? I'm thinking of using Timers to force redraws of the control - an...more >>

I'm drawing a shaped control using a version of the following code in the OnPaint: GraphicsPath path = new GraphicsPath(); path.AddRectangle(rect); // rect is previously defined Region region = new Region(path); Pen penOutline = new Pen(Color.Black, 1.0f); e....more >>

I'm getting started with GDI+ and I'm looking for a good book with showing the most recent way of displaying data in cool graphics. I'm looking to "spice-up" my data presentation with good looking controls and deep color depth. I'm not an artist, so I am also hoping for a book that goes into...more >>

Hi, all: I'm trying to subclass a ListView ("override" in C#) to change the graphical behavior when an item is selected. Trouble is, I can't seem to find the event. I overrode the OnPaint event in my derived class, but it never gets fired. Can someone please help me? My ultimate goal is ...more >>

Does anyone know of a way to save transparent TIF or PNG? I looked at Bob Powels FAQ, but it only has saving for Gif and I need to save it with 24bit color. Thanks....more >>

Hello I'm planning a .NET app that retrives an image from a binary field in a database table and presents it on the user browser, without doing tipical direct file references in html (tag <img src='myimage.gif'> becomes <img src='web_service?imgid=123'>) before presenting my hole image ...more >>

Is there a technique, or approach, that allows you to create a brush with using an image to define it's shape (ie. a mask). Pretty much like the way channels work in Photoshop - where the image White the bursh shows through, and where it's black it's masked. Anything like this - or am I goin...more >>

Does anynone know of any way to use GDI+ to extract the OCR text from a TIFF file that has been created in Microsoft Office using Office Document Imaging? MODI embeds the OCR text right in the TIFF file. I thought that the OCR might show up as a frame and be selectable with the SelectActiv...more >>

Hi all, I have develop some compontents with transparent property. I can do it partially, when there is only a parent container under it. When there are other control behind it, the tranparent control on the top only paint the parent background on it, and ignores the other controls' background u...more >>

Hi Folks! :O) I would need to rotate a control 180 degrees (and still be able to use it). Does any one knows how to make this happens ? I have a TrackBar control on a form with its TickStyle set to None and its Orientation set to Vertical. For now the cursor (on the trackbar) is pointing ri...more >>

I'm currently investing in learning the whole GDI+ thing and custom drawing controls. And frankly, it's an unbelievable form of liberation to have this type of power and control over visual style. One question I do have, however, is in regards to future directions and XAML. Without any real ...more >>

Hi!=2E Im developing my first app in C# and am unfamiliar with the= concepts of transparency=2E In my form there is a normal main= panel with a background color,onto which controls are added to= represent various objects=2E I need to draw lines between some of= these objects,however,some of ...more >>

Hi, I am working on a windows application (C#) which has number of tab pages and each tab page contains large number of controls (labels, text boxes, buttons etc). After facing the window creation problem, I came to know that the maximum no. of window handles per process is limited to 10000. ...more >>

When using a PropertyGrid, I have an object with a Date property, but I am only interested in the Time portion. How do I make the PropertyGrid allow editing the time only? Just the hours and minutes, preferably? Thanks -- Chris dunawayc[AT]sbcglobal_lunchmeat_[DOT]net To send me an ...more >>

I have seen http://support.microsoft.com/default.aspx?scid=kb;EN-US;Q319061 and http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnaspp/html/colorquant.asp Is there anyway to do this without unsafe code??? Thanks, Matt...more >>

Hello, I am drawing pie charts in gif format an when I use the following colors they always appear grainy.... System.Drawing.Color.FromArgb(173, 216, 230), System.Drawing.Color.FromArgb(0, 128, 0), System.Drawing.Color.FromArgb(250, 250, 210), System.Drawing.Color.FromArgb(255, 0, 0) b...more >>

Hello all, In the course of implementing a curve drawing tool, I came across some GDI+ rasterization that I can't explain. Basically, what happens is that for some sets of points that make up a curve (cardinal spline), one or more ends are not drawn the way I expect. Specifically, it appears ...more >>

I try to convert a animation-gif file to multipage tiff file. my code: <%@ page language="JScript" Debug="true"%> <%@ Import Namespace="System.Drawing" %> <%@ Import Namespace="System.Drawing.Imaging" %> <%@ Import Namespace="System.Drawing.Drawing2D" %> <%@ import namespace="System.Runtime...more >>

I would like to alter an image so that the pixels bordering subject matter of the image are transparent. I can start with the image in .gif, .bmp, or ..png format. How can I convert the pixels bordering the image's subject matter from white to transparent? Preferably in Resource Editor. Tha...more >>

I'm trying to use the GetHBITMAP method. The image I save for bitmap2 is black instead of containing the data from the original image. I'm not sure what I am doing wrong. The first bitmap saved looks correct. But I think the hBitmap that I get is missing data or something. Like maybe I need to pa...more >>

I get the following exception when I try to run a c# winform app that includes an imagelist: An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in mscorlib.dll Additional information: Exception has been thrown by the target of an invocation. Unhandled...more >>

Hello, I'm writing a web application for people to create a graphics and then sent to database for mass printing. For this reason, the image will be at best produced in CMYK color so that there will be little color difference. I have no problem to produce the graphics in RGB TIFF for...more >>

Is there a way to draw an Image, and apply an opacity (alpha level) to the entire image? That would be really really useful (especially for making things disabled, without having to produce secondary versions of each image). Many thanks! === Phil Cockfield (Auckland | Aotearoa) ...more >>

I have floating point var that I want to display in a 3.3 format if the Value is 20.0 and I use the Var.ToString(); the result is just 20, can someone point out the format string that is necessary to produce 20.000 Thanks Ken Beauchesne ...more >>

how to increase the quality of jpeg file? ...more >>

(Type your message here) can anyone help me on how to program visual basic=2Enet to control= the webcam to take pictures and save them on a specified= directory=2E pls, anyone, i really need ur help=2E i had to finish= my thesis by this month=2E any help will be appreciated but pls do= prov...more >>

(Type your message here) -------------------------------- From: gayathri gopinath I am having several metafiles. Can i use these metafiles to create multi frames tiff image. If so, how can i do it? I have done multi frames metafiles from gif,bmp... But when i create multi framed tiff ...more >>