Difference between revisions of "GEF3D Coordinate Systems"

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== Coordinate Systems ==
 
== Coordinate Systems ==
=== Screen Coordinates ===
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=== Mouse Coordinates ===
also called mouse coordinates in GEF or window coordinates in OpenGL
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also called window coordinates in OpenGL
=== Global World Coordinates ===
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=== World Coordinates ===
 
3D coordinates in world space
 
3D coordinates in world space
 
==== Inverted Coordinate System ====
 
==== Inverted Coordinate System ====
 
origin seems to be in the upper left / front corner
 
origin seems to be in the upper left / front corner
 
==== Figure-local 3D Coordinates ====
 
==== Figure-local 3D Coordinates ====
=== Surface Coordinates ===
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=== Virtual Coordinates ===
2D coordinates on the surface of a 3D host figure
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2D coordinates supplied to embedded 2D editors
==== Figure-local 2D Coordinates ====
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only applies to embedded 2D editors
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== Coordinate Conversion ==
 
== Coordinate Conversion ==

Revision as of 19:08, 29 June 2009

In GEF, there usually is one global coordinate system and figure-local coordinate systems to deal with. Generally, mouse coordinates can be translate to the global coordinate system and the figure-local coordinate systems in a simple and straightforward fashion, and users of the framework seldomly have to deal with these issues. In GEF3D however, there are more coordinate systems involved and dealing with those can become cumbersome. This article aims to describe the concepts of coordinate systems and coordinate system conversion in GEF3D.

Contents

Coordinate Systems

Mouse Coordinates

also called window coordinates in OpenGL

World Coordinates

3D coordinates in world space

Inverted Coordinate System

origin seems to be in the upper left / front corner

Figure-local 3D Coordinates

Virtual Coordinates

2D coordinates supplied to embedded 2D editors

Coordinate Conversion

  • global world coordinates <-> figure-local 3D coordinates
  • surface coordinates <-> global world coordinates
  • screen coordinates + depth value -> global world coordinates
  • screen coordinates -> figure-local 3D coordinates
  • screen coordinates -> surface coordinates

Embedded 2D GEF Editors

Make Yourself at Home: Creating a Fake 2D Environment

Coordinate conversion, Virtual picking, modified SWT events