Animate tiles marked as animated in tile_config.json

[verate]

Summary

SUMMARY: Infrastructure "Tile animations can be defined in tile_config.json files"

Purpose of change

Animations can add information and atmosphere to the game. Tiny lights can blink, enemies can sway, icons can hover. This change allows tilesets to specify looping animations for individual tiles that will play during the player's turn.

Describe the solution

Tileset maintainers mark tile definitions with "animated": true and specify fg/bg sprite lists, with weight being overloaded to indicate the number of frames, at a standard rate of 60fps (example below). The game reads the json animated property into tile_type and uses the current time to determine which sprite image to render.

Describe alternatives you've considered

Some tiles use fg/bg to display different images based on the tile's in-world position, rather than based on the time. For monsters, the icon is based on some identifier. We could introduce some sort of two-dimensional weighed list to handle animations for such tiles, but this can be a future project.

Testing

Format the single-line tile_config file for Ultimate, find the t_console entry, and replace with:

{
	"id": "t_console",
	"animated": true,
	"fg": [
		{"weight": 50, "sprite": 2290},
		{"weight": 10, "sprite": 2285}
	]
},

Ensure animations are enabled. Find a console and confirm that its screen flickers. Must be a loose wire.

[Fris0uman]

How is this going to interact with the compose script?

[verate]

How is this going to interact with the compose script?

Tile information is preserved by the compose script, and this should apply to this new animated flag (as it does to rotates and multitile). The flag would be added to the tile entry, the script would preserve it, and the game would read it from the output tile config.

[ifreund]

Thanks!

[Fris0uman]

could you explain this feature in TILESET.md please.
https://github.com/CleverRaven/Cataclysm-DDA/blob/master/doc/TILESET.md