You can draw walls and doors directly onto a battlemap using coordinates. To draw a wall, use the _ character followed by coordinates.
Example
https://otfbm.io/_B3J3
This will draw a line from B3 to J3
You can finish a line and start a new one with the _ character
Example
https://otfbm.io/_B3J3_B6J6
You can add doors with following codes:
-o open door,
-d closed door,
-b double door,
-s secret door
Here is a complex example:
Example
https://otfbm.io/_B2G2G4H4-dH6G6G8-sF9E10-bC10B10B2_B6-oG6
Colors
Color support has been added to walls and doors. The same colors can be used as per tokens. The character -c is used to specify the color. This must be defined at the start of each wall segment. Eg. for the wall section _a2g2, you can change its color to blue like so _-cba2g2
Example Without Color
https://otfbm.io/_a2g2
Example With Color
https://otfbm.io/_-cba2g2