Nimarble

It's a marble game modeled after a classic from the arcade era. Works with touchpad and trackball, untested but possibly impractical with a mouse.

Screenshot

Development

It uses nimgl and requires cimgui to be installed or present in current directory.

Build:
```
nimble build
```
Run
```
./nimarble
```

Usage

It's largely keyboard-driven. Use L to toggle between controlling the marble and normal mouse mode.

Key	Action
Up	pan_up
Down	pan_down
Left	pan_left
Right	pan_right
PageUp	pan_in
PageDown	pan_out
Home	pan_ccw
End	pan_cw
`[`	prev_level
`]`	next_level
`L`	toggle_mouse_lock
`P`	pause
`S`	step_frame
`F`	follow
`W`	toggle_wireframe
`G`	toggle_god
`X`	respawn
`R`	do_reset_player
`E`	focus_editor
`Q`	do_quit

Editor keymap:

Key	Action
Escape	back
Tab	toggle_cursor
Up	cursor N
Down	cursor S
Left	cursor W
Right	cursor E
PageUp	cursor NW
PageDown	cursor SE
Home	cursor SW
End	cursor NE
`-`	dec
`=`/`+`	inc
`0` .. `9`	set_number
`.`	decimal point
`B`	toggle_brush
BS/Delete	delete
`X`	set_mask XX
`C`	set_mask IC
`U`	set_mask CU
`L`	set_mask LL
`V`	set_mask VV
`A`	set_mask AA
`J`	set_mask JJ
`I`	set_mask II
`H`	set_mask HH
`R`	set_mask RH
`G`	set_mask GG
`S`	set_mask SW
`P`	set_mask P1
`M`	set_mask EM
`Y`	set_mask EY
`T`	set_mask TU
`N`	set_mask IN
`O`	set_mask OU
`W`	save
`E`	leave

Level structure

A level is comprised of layers comprising the height map which is just a grid of floating point numbers, and a mask which defines the attributes of each point such as entity start points, surface type, or whether there is a cliff.

Levels are stored as TSV files making spreadsheet interoperability relatively straightforward. Generally each level will have two TSV files which are arranged with each row's starting column increasing every row, which enables what I call the "vertical is diagonal" perspective of the playing field.

Masks