81 lines
2.1 KiB
Lua
81 lines
2.1 KiB
Lua
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local marker_lookup = ...;
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-- Format marker ids to allow their use as formspec element ids.
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-- We're mostly concerned with guarding against the : character because it is
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-- common for ids and has an alternate meaning in formspecs.
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-- id: The id to format
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--
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-- Returns the formatted id
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local function format_marker_id(id)
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return id:gsub(":", "_");
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end
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-- Find the marker data for a given id
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-- id: The id to search for
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--
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-- Returns the marker data, or nil if not found
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local function get_marker(id)
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if not id then
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return nil;
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end
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id = format_marker_id(id);
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for _,marker in pairs(marker_lookup) do
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if marker.id == id then
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return marker;
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end
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end
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return nil;
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end
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-- Register a marker with textures to display
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-- id: A string containing the id of the marker
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-- name: A string containing the displayedname of the marker
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-- textures: A table of texture names.
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-- These should correspond with detail levels,
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-- any detail level past the length of the table will return the last texture
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local function add_marker(id, name, textures)
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if not id then
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return nil;
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end
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id = format_marker_id(id);
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local existing_marker = get_marker(id);
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if existing_marker then
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existing_marker.name = name;
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existing_marker.textures = textures;
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else
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marker_lookup[#marker_lookup+1] = {
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id = id,
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name = name,
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textures = textures,
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};
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end
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end
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-- Get the texture name (minus extension) for the given marker and detail level.
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-- id: A string containing the marker id
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-- detail: The detail level
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-- Returns a string with a texture name, or nil if no matching marker was found.
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local function get_marker_texture(id, detail)
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if not id then
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return nil;
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end
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id = format_marker_id(id);
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local marker = get_marker(id);
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if marker then
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return marker.textures[math.min(detail, #marker.textures)];
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end
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return nil;
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end
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return {
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add = add_marker,
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get = get_marker,
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get_texture = get_marker_texture,
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};
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