This guidance will give a quick overview on how to implement lines on the Dynmap, for example to mark the Fellowship Path. A full command list can be found on the Dynmap wiki below:
命令 · Dynmap Wiki

Our Dynmap link: http://build.mcmiddleearth.com:8123/index.html#



Marker Sets
The map has been divided into sets. Sets are essentially layers than you can toggle on and off at will. A number of sets have already been created, the list can be seen below. Within a set any type of dynmap marker can be put, from icons, to lines and polygons. When creating a new marker, consider if you want it to be part of a current set, or if it requires a new one to be created. Bear in mind, it is better to have less sets so the list is not too long, though having the option to toggle on and off different layers is useful.



Sets can be created with the command /dmarker addset
A current set can be edited with the command /dmarker updateset
Sets can be included with a number of configurable augments, such as being able to set their position on the list (priority), and changing if they are hidden by default.

Augments:
id: - sets the ID of the set (for editing/changing)
label: - set the label for the set which appears on the set list (labels must be in quotations)
newlabel: - let’s you change the label on a currently created set (labels must be in quotations)
prio: - sets the priority on the list (higher numbers near the top)
hide: - sets if the set layer is toggled on automatically

All set IDs:
Fellowship path (incl. Sam & Frodo): Fellowship
Aragorn, Legolas & Gimli path: A
Merry & Pippin: MP
March on the Black Gate: B


Line Markers
Each “group” of the Fellowship has an individual coloured line, which is split up into multiple shorter lines joined together to create seamless transition. The colours of these lines have been specifically chosen so that they are easily visible for people who experience the three most common forms of colour blindness. A useful guide to these can be found at the below link.
Coloring for Colorblindness

Colours:
Main fellowship/Frodo & Sam - FF0000
Aragorn Path - 1A85FF
Merry & Pippin together - E66100
Merry & Eowyn - D41159
Pippin & Gandalf - E1BE6A
March on the Black Gate - 1AFF1A

Lines can be created with the command /dmarker addline and edited /dmarker updateline. A line is created using a many points at regular intervals with /dmarker addcorner. There may be a limit to how many points can be saved on a single line however I did not reach this (some lines went up to about ~350 points). When you do /dmarker addcorner, the point which is saved is not the centre of the block, but the north-east corner of the block (see example below).



Each line has a “label”. When you click on the line on the Dynmap, the label shows what the Line is, for example “Merry and Pippin 1” (the 1 being used to help identify the ID of the path in case you need to amend it). A full list of ID’s is below;

F# e.g F1 for all Fellowship path lines (Bag End - Emyn Muil)
MP# e.g MP1 for Merry & Pippin’s path lines (Emyn Muil - Dol Baran)
M# e.g M1 for Merry & Eowyns path (Dol Baran - Minas Tirith)
P# e.g P1 for Pippin & Gandalfs path (Dol Baran - Minas Tirith)
A# e.g A1 for Aragorn, Legolas & Gimli’s path (Emyn Muil - Minas Tirith)
B# e.g B1 for the March on the Black Gate (Minas Tirith - Black Gate)

Once again, each line comes with a number of configurable augments:
id: - sets the ID of the line (for editing/changing)
label: - set the label for the line which appears when you click on the line (labels must be in quotations)
newlabel: - let’s you change the label on a currently created line (labels must be in quotations)
color: - sets the colour of the line (using hex code)
Weight: - sets the width of the line (all lines are using a weight of 4 for our purposes)
opacity: - sets the opacity of each line (all lines are using 1 for our purposes)
set:- selects which set for the line to be saved to
newset: - changes the set which the line is a member of

Another thing to consider is areas where multiple paths run adjacent to eachother e.g in Rohan. Each path should run a minimum of 3 blocks away from another to avoid too much overlap when zoomed out.

Example - If you want a make a new line (for this example another Sam/Frodo line) this is what you would do;

1. Mark your path out with wool at regular intervals so it is smooth
2. Stand on each wool block and type /dmarker addcorner
3. Once all your points are marked, type /dmarker addline id:SF1 label:”Sam and Frodo 1” set:Fellowship color:FF0000 weight:4 opacity:1

Done!