Magnifying Glass - demonstrates different ways to obtain or create proper DC and use BitBlt - StretchBlt functions

Environment:VC5/VC6

Generally the sample demonstrates different ways to obtain or create proper DC and use BitBlt - StretchBlt functions.

It is another ZoomIn demo application created with doc-view architecture. CView derived class experienced minimum changes from AppWizard generated one.

CImageWnd window covers CView derived class window. CImageWnd contains a copy (mirror) of CView derived class window bitmap to draw. CImageWnd window becomes transparent when magnifying glass is inactive and draws a "lens" over the bitmap when active. The "lens" is a small zoom window. Magnifying Glass doesn't depend on a view contents. It is easy to modify CMgnView::OnDraw or CMgnView::OnEraseBkgnd and Magnifying Glass still will work with another contents.

To activate or deactivate magnifying glass - press button on a toolbar.

To magnify a portion of a view - activate magnifying glass, press left mouse button and move "lens" around a view.

To change magnifying glass size, shape or zoom - activate magnifying and click a view with right mouse button. It is possible to create several views just use file - new command. Note that for each view magnify glass keeps its own properties.

It is easy enough to make a "lens" astigmatic (cylinder) or add another "optical effects".

I couldn't remove some "optical side effects". When magnifying glass is slowly moved from outside a frame inside it over a border you see a "diffraction grid".

Download source - 27 Kb



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Organizations are increasingly gravitating toward mobile-first application development as they assess the need to revamp their application portfolios to support touch computing and mobility. Consumerization has brought higher expectations for application usability along with the mobile devices themselves. Enterprises are increasingly shifting their new application acquisitions and development efforts toward mobile platforms. With this backdrop, it is natural to expect application platform vendors to invest in …

  • For the first time in modern history, workplace demographics now span four generations. Understanding the unique social influences that have shaped the behaviors of each is instrumental in creating productive work teams. And when managed effectively, their strengths, perspectives, and experiences can bring synergy in the workplace. Download this white paper for best practices on how to better understand and effectively manage a multi-generational workforce.

Most Popular Programming Stories

More for Developers

RSS Feeds

Thanks for your registration, follow us on our social networks to keep up-to-date