Can anyone point me to an example of drawing a line in real time as a user drags the mouse. I have tried several ways to get around the flickering caused by invalidate when the line is drug across other elements, to no avail. I have the book on GDI+ with .NET but it does not show an example...more >>

Hi, I have a form on which I want to place elliptic shaped controls. Next I want to move these controls. Everything works fine when there is less than ten controls but when I have a lot of them (about 100) my controls are redrawing very slow. But if i use normal shaped control it works fine. I ...more >>

Hi, There is an request from my customer to incorporate body chart/diagram in ..net platform so that drawing of different points/icons/symbols can be done on the image to denote something done to the image. After that, all these drawings on the image must be able to printout in report. ...more >>

Mr. Powell suggests to use CreateGraphics outside Paint eventhandler, OnPaint, OnPaintBackGround in order to obtain the graphics object. At WndProc method, one can grab a graphics object from the handle of the control's window (GetWindowDC). When I am handling the WM_NCPAINT message, what will...more >>

I’ve been doing some work with the GDI+ aspects of the .NET framework to further my ability to write custom controls. I have noticed some things that are frustrating to me, and I am wondering if maybe someone would be kind enough to explain, or point me in the right direction. First things ...more >>

1) How to save the image in the picture box as a file, in the same format and display as is appearing in the picture box after stretching or centering the image? i.e. the picture box display should be stored as an image file, not the image in its actual format. 2) The graphics generated on the pi...more >>

Has anyone experienced a problem where the items in the dropdown area of a combobox do not appear? I can press the down arrow on the keyboard when the control has focus and the proper text will display. I can even open the dropdown, select any item (that is not drawn) and the proper text is ...more >>

Hi everyone, I have a doubt about one thing and it will be very helpfull if someone knows the answet and some gudilines to the solution. I'm developing application for the Pocket Pc. Application need to deal with GPS. On the device, on smart card will be map, about 80MB big. I can use the who...more >>

I'm a little confused over re-drawing part of a control. From reading the ref docs, it appears that the Invalidate([rect]), that takes a rectangle or region as a parameter should do this. However what I'm finding is that when this method is called with a Rectangle that represents a part of...more >>

I need to draw a bitmap from CAD data and then print it in color (at least 16 bits) at 600DPI to a large page. The resulting bitmap can be as large as 20000 x 20000 pixels. What is the best way to work with these large images? Is there some way to work with them in a compressed format? If ...more >>

I've placed a PrintPreviewControl in a MDI child form. It has a Dock property of fill and an AutoZoom property of True so that whenever the form's size changed the control will change as well. On a status bar I've added an area that shows the Zoom property. Unfortunately I can't get the cor...more >>

Can anyone recommend a trainer/training course that deals solely with GDI+ and goes far and above the typical "here is how you draw a circle" scenarios? We are started to get rather complex imaging requirements and my GDI+ knowledge is at a very basic level. I need access to an expert trainer...more >>

Hello all, I'm trying to draw a rectangle with ROP2 = R2_MASKPEN on a GDI+ image. The method below (TestDraw) works when I pass it a Graphics object from a paint event. However, when I pass in the result from Graphics.FromImage, it seems the ROP2 is ignored and I end up with a solid black re...more >>

I’ve implemented a GUI for a tabletop device using C# and the .NET framework 1.1. At the moment, my interface consists of a collection of virtual sheets of paper in which you can draw. Those documents can be rotated and moved. For the first prototype, I implemented all the graphics by myself...more >>

Hi, where can I find the colors, that (3rd party) controls use, when they are in Office2003 design-mode. Somehow these colors depend on the XP-style and must be available in the system. Where can I find those colors? Anybody knows? ...more >>

Is it possible to write a program that will modify a jpg, say adding some lines or text to it, and then save it leaving quality and compression the same? Ideally in such a way that you could run the program multiple times with no degradation in quality? I know that there are some transforms (lik...more >>

I am converting an Win32 medical image processing application to .Net. I am new the UI side of .Net applications and I am trying to display a grayscale images at a reasonable frame rate (5-10 frames per second). The application captures 1024x768 12-bit grayscale pixels, which I am storing in ...more >>