Skip to main content

General Information

What You Will Find in This Document​

This document provides information about the "RxSDK Display" components:

  • RxDisplayCOM: Used to display all file formats to a Windows device.
  • RxDisplay3DCOM: Used only to display 3D file formats.

The Coordinate Systems​

The RxSDK operates with three coordinate systems as follows:

  • Original Coordinate System: Created by the original application used to generate the document.
  • World Coordinate System: Used internally by RxViewCOM and RimEngine.
  • Screen Coordinate System: Used by Windows (device coordinates).

When a document is loaded, it is transformed and scaled from the original coordinate system to the world coordinate system. When a document is displayed, it is transformed and scaled from the world coordinate system to the screen coordinate system.

A document may have either a top-down or bottom-up world coordinate system, depending on the source format:

  • Most CAD-based formats (e.g., DWG, DGN, PLT) use a bottom-up system.
  • Most other document formats (e.g., TIFF, PDF, Word) use a top-down system.

You can use the following functions provided by RxDocCOM to transform coordinates:

  • ScreenToWorld: Transforms from screen to world coordinates.
  • WorldToScreen: Transforms from world to screen coordinates.