playscii/docs/design/old/art_class.txt

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example: an art with 4 frames and 3 layers
Art
|width, height, charset, palette: stuff that's written to / read from disk
|renderables: list of renderables using us
|vert_array, elem_array: geo array for all layers (changes on: resize, layer add/del)
|update lists: tiles of specific frame+layers whose array data we should update
|frames
|0
|delay: time before display next frame
|uv_array, fg_color_array, bg_color array: arrays for all layers of this frame
| (changes on: tile edit, art resize, layer add/del)
|layers
|0
|z: z depth for this layer
|chars, fg_colors, bg_colors: data (lists of rows) for this layer
|1
|z
|chars, fg_colors, bg_colors
|2
|z
|chars, fg_colors, bg_colors
|1
|delay
|uv_array, fg_color_array, bg_color array
|layers
|0
|z
|chars, fg_colors, bg_colors
|1
|z
|chars, fg_colors, bg_colors
|2
|z
|chars, fg_colors, bg_colors
|2
|delay
|uv_array, fg_color_array, bg_color array
|layers
|0
|z
|chars, fg_colors, bg_colors
|1
|z
|chars, fg_colors, bg_colors
|2
|z
|chars, fg_colors, bg_colors
|3
|delay
|uv_array, fg_color_array, bg_color array
|layers
|0
|z
|chars, fg_colors, bg_colors
|1
|z
|chars, fg_colors, bg_colors
|2
|z
|chars, fg_colors, bg_colors