User:Gabbar1947/GSOC17/Report

Annotations: Implement support for 2D annotations | Project Report

The project was divided into two parts:

• Creating a new primitive for annotations
• Rendering the primitives to the wireframe view
• Support for the screen projection

Creating a new primitive for annotations

• What was basically required was a container to hold things together

  https://sourceforge.net/p/brlcad/patches/469/#ea23
  https://sourceforge.net/p/brlcad/patches/469/#34f1

Rendering the primitive on screen

• The next part was to add support for the visualization of the primitive
• Input for the primitive also handled through the 'in' command in the patches mentioned below

 https://sourceforge.net/p/brlcad/patches/471/#97f3
 https://sourceforge.net/p/brlcad/patches/471/#4b72

Support for the 3D->2D projection

• Annotations always remain in the plane of the screen
• Modifying the projection matrices for all the display managers was another task
• Scaling the annotations was another issue
• All of this was handled by the patches mentioned below

  https://sourceforge.net/p/brlcad/patches/471/#cd2e
  https://sourceforge.net/p/brlcad/patches/471/#acd7

Project Extension

After discussions with the mentors, some extension ideas came up:

• Functionality to set up the annotation properties for the primitive
• Extension for the geometric shape of the annotation
• Common functionality for the annotation and the sketch primitive in order to reduce redundancy
• Features related to the coordinate system like the annotation scaling
• Algorithm to provide a bounding box for the text using the relative coordinates