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See Jens Gravesen: “Adaptive subdivision and the length of Bezier curves” mat-report no. 1992-10, Mathematical Institute, The Technical University of Denmark, or in “Graphics Gems V” (Editor Alan Paeth). Sample Code Download demo project – 34 KB Download Source code – 6 KB The demo project shows a rotating gradient filled ellipse with a dotted […]

The CMetaFile class is derived from CMetaFileDC and allows you to easily load metafiles from disk and display them. A metafile can also be displayed with various alignment options, in order to preserve aspect ratio, etc. The class include serialization, allowing you to embed a metafile into a CDocument, for example. To use the class, […]

3 steps to show how to draw vertical and horizontal dotted lines(1 pixel on 2) using GDI calls. This code works under all Win32 platforms. Step 1 (initialization) A patterned brush is created during program (or view) initialization. This brush will be used to draw the dotted lines : { … // Create a dotted […]

In MFC, GDI Objects need to be selected and then destroyed. CGDI and its derived classes take care of this by selecting the object in the constructor and deselecting it in the destructor. CGDIObject is a template class which takes as its parameter the CGdiObject-derived class. This class library only accounts for a few of […]

Introduction Rectangles, Rounded Rectangles and Ellipses in Windows can only be drawn by GDI as axis-aligned figures. If one wishes to draw rotated or skewed figures under Windows NT, one can use World Transforms but they are unfortunately not available under Windows 95/98. For a cross-platform solution, one needs to do more of the work […]

I used the code from CodeGuru to implement the Drag and Drop processing in my tree control. I wanted to modify this slightly so that a node would automaticall expand when I dragged a node over a drop target and hovered over it. This is similar to what occurs in Windows Explorer. The following code […]

. I wanted to create a control which would behave as a dialog or formview (you can place controls here). There is a simple way to do it – to take advantage of ActiveX. Create a new MFC ActiveX ControlWizard workspace (no need to special options). Insert a new dialog resource named IDC_MYDIALOG (check following: […]

Environment: Win95/98, NT4, VC5.0, UNICODE Tray Calender is a freeware utility that I wrote after being amazed that (a) Microsoft did not bother to offer us a calender in the tray, and (b) People were charging good money for tiny little tray apps. The idea is simple: Put the day of the month next to […]

Wes Clyburn already wrote an SMTP class that sent mails which were stored in CMailMessage entities. Look at his entry on the Codeguru site for details. I took these classes and added a POP3 class, based on Wes’ CSMTP class. For this, I slightly modified CMailMessage and CSMTP. Now you can create a message in […]

The purpose of this article is to teach how to: Make an MFC app, its documents and its other objects scriptable by adding a COM Automation object model. Highlights of the sample object model in TIA are a deferred updating technique, Visible properties and a RemoveDocument method. Wrap an internal C++ object, the “real” data, […]

This article is based on the idea of Jason Wylie, the author of the article Transparent Dialog, but it uses a mask bitmap instead of getting the transparency information out of the bitmap. This way many funny things can be done… In some cases it’s nice to have a window that not always looks the […]