Marker and MarkerArray Display plugin

[Sarath18]

I would like to work on the Marker and MarkerArray display plugin. Since MarkerArray is a list of Markers, creating a MarkerManager for processing the incoming marker message makes sense and will reduce a lot of redundant code. I plan to add support for these in the following stages:

• Part 1: MarkerDisplay plugin

  • Create a Marker manager class to process and visualize the incoming marker messages
  • Add, Delete and Delete All marker actions
  • Basic Geometries (Arrow, Cube, Sphere, Cylinder)
  • Geometry List (Line List, Line Strip, Points, Triangle List)
  • Basic marker properties (Color, Scale, and Pose)

• Part 2: Add support for more geometry types and their properties

  • Sphere List
  • Cube List
  • Text markers
  • Mesh markers

• Part 3: MarkerArrayDisplay plugin

  • Process, visualize and manage multiple markers received as MarkerArray message

• Part 4: Additional properties

  • Marker Namespaces (with GUI config)
  • Frame locking
  • Marker Lifetime

[chapulina]

In case you haven't seen it, there's a MarkerManager class on ign-gazebo that could be helpful. But that uses Ignition Transport.

[Sarath18]

Thank you for the reference. Fortunately, the MarkerManager that I wrote over the weekend is quite similar to MarkerManager available in ign-gazebo. I'll try to keep the logic similar and open a PR for Part 1 today.