Added four Visualizer colormap function and png files

[smathimech]

This MR address this issue #4689

Details:

• Added four different colormap function for visualizer.
• Conversion script not requires (adding new function).

[CLAassistant]

All committers have signed the CLA.

[smathimech]

This is my first contribution to this modelica repository. I'm part of Modelon, India. I hope that, signed the CLA correctly.

[thorade]

Mathi, thanks for adding these colormaps. You used two email addresses while committing, can you add the second address also to your github profile?

The existing colormaps are all in this overview/comparison, maybe the new maps could be added there as well?
https://github.com/modelica/ModelicaStandardLibrary/blob/master/Modelica/Resources/Images/Mechanics/MultiBody/Visualizers/Colors/ColorMaps/ColorMaps.png

[smathimech]

Since i don't the original source file of this colormap, it's quite difficult to get similar represenations. Let me know, if this need to improved further.

[tobolar]

Thanks for this contribution. Please consider my comments below (resctricted to Modelica.Mechanics.MultiBody.Visualizers.Colors.ColorMaps).

1. The definition of Plasma and Viridis seems to be identical.

2. TrafficlightColor can even be renamed to TrafficLight.

3. Function name shall start with a lower case letter (see Modelica.UsersGuide.Conventions.ModelicaCode.Naming):

   • CoolWarm -> coolWarm
   • TrafficlightColor similarly
   • Plasma similarly
   • Viridis similarly

   When renamed, please update also figure Modelica/Resources/Images/Mechanics/MultiBody/Visualizers/Colors/ColorMaps/ColorMaps.png accordingly.

4. Class description string is missing in

   • TrafficlightColor
   • Plasma
   • Viridis

5. For TrafficlightColor, maybe the default n_colors=3 makes more sense.

[smathimech]

Thanks for this contribution. Please consider my comments below (resctricted to Modelica.Mechanics.MultiBody.Visualizers.Colors.ColorMaps).

1. The definition of Plasma and Viridis seems to be identical.

2. TrafficlightColor can even be renamed to TrafficLight.

3. Function name shall start with a lower case letter (see Modelica.UsersGuide.Conventions.ModelicaCode.Naming):

   • CoolWarm -> coolWarm
   • TrafficlightColor similarly
   • Plasma similarly
   • Viridis similarly

   When renamed, please update also figure Modelica/Resources/Images/Mechanics/MultiBody/Visualizers/Colors/ColorMaps/ColorMaps.png accordingly.

4. Class description string is missing in

   • TrafficlightColor
   • Plasma
   • Viridis

5. For TrafficlightColor, maybe the default n_colors=3 makes more sense.

Thanks for the comments.

1. Both colormap might identical, but it might be have some use case.
2. Renamed to TrafficLight.
3. All four function name start's with small letter.
4. updated the figure and string description details as well.
5. For TrafficLight, have applied the modifier n_colors=3.