forked from minetest-mods/digilines
Merge remote-tracking branch 'upstream/master'
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commit
4e6b34da34
107
lcd.lua
107
lcd.lua
@ -5,7 +5,6 @@
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-- load characters map
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local chars_file = io.open(minetest.get_modpath("digilines").."/characters", "r")
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local charmap = {}
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local max_chars = 12
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if not chars_file then
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print("[digilines] E: LCD: character map file not found")
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else
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@ -21,7 +20,7 @@ else
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end
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-- CONSTANTS
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local LCD_WITH = 100
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local LCD_WIDTH = 100
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local LCD_PADDING = 8
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local LINE_LENGTH = 12
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@ -30,31 +29,96 @@ local NUMBER_OF_LINES = 5
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local LINE_HEIGHT = 14
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local CHAR_WIDTH = 5
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assert((CHAR_WIDTH+1) * LINE_LENGTH <= LCD_WIDTH - LCD_PADDING*2, "LCD: Lines set too long!")
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assert((LINE_HEIGHT+1) * NUMBER_OF_LINES <= LCD_WIDTH - LCD_PADDING*2, "LCD: Too many lines!")
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local split = function(s, pat)
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-- adapted from https://stackoverflow.com/a/1647577/4067384
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-- simplified for our only usecase
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local st, g = 1, s:gmatch("()("..pat..")")
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local function getter()
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if st then
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local segs, seps, sep = st, g()
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st = sep and seps + #sep
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return s:sub(segs, (seps or 0) - 1)
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end
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end
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return getter
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end
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local create_lines = function(text)
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--[[
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Typeset the lines according to these rules (in order of subjective significance):
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- words that fit on the screen but would let the current line overflow are placed on a new line instead
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- " | " always forces a linebreak
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- spaces are included, except when there is a linebreak anyway
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- words with more characters than fit on screen are just chopped up, filling the lines as full as possible
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- don't bother typesetting more lines than fit on screen
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- if we are on the last line that will fit on screen
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]]--
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local line = ""
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local line_num = 1
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local tab = {}
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for word in string.gmatch(text, "%S+") do
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if string.len(line)+string.len(word) < LINE_LENGTH and word ~= "|" then
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if line ~= "" then
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local flush_line_and_check_for_return = function()
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table.insert(tab, line)
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line_num = line_num+1
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if line_num > NUMBER_OF_LINES then
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return true
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end
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line = ""
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end
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for par in split(text, " | ") do
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for word in split(par, "%s") do
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if string.len(word) <= LINE_LENGTH and line_num < NUMBER_OF_LINES then
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local line_len = string.len(line)
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if line_len > 0 then
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-- remember the space
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line_len = line_len + 1
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end
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if line_len + string.len(word) <= LINE_LENGTH then
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if line_len > 0 then
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line = line.." "..word
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else
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line = word
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end
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else
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table.insert(tab, line)
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if word ~= "|" then
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line = word
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if word == " " then
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-- don't add the space since we have a line break
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else
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if line_len > 0 then
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-- ok, we need the new line
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if flush_line_and_check_for_return() then return tab end
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end
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line = word
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end
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end
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else
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-- chop up word to make it fit
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local remaining
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while true do
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remaining = LINE_LENGTH - string.len(line)
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if remaining < LINE_LENGTH then
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line = line .. " "
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remaining = remaining - 1
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end
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if remaining < string.len(word) then
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line = line .. string.sub(word, 1, remaining)
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word = string.sub(word, remaining+1)
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if flush_line_and_check_for_return() then return tab end
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else
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-- used up the word
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line = line .. word
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break
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end
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end
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end
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end
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-- end of paragraph
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if flush_line_and_check_for_return() then return tab end
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line = ""
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end
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line_num = line_num+1
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if line_num > NUMBER_OF_LINES then
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return tab
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end
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end
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end
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table.insert(tab, line)
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return tab
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end
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@ -63,7 +127,7 @@ local generate_line = function(s, ypos)
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local parsed = {}
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local width = 0
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local chars = 0
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while chars < max_chars and i <= #s do
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while chars < LINE_LENGTH and i <= #s do
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local file = nil
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if charmap[s:sub(i, i)] ~= nil then
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file = charmap[s:sub(i, i)]
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@ -73,10 +137,13 @@ local generate_line = function(s, ypos)
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i = i + 2
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else
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print("[digilines] W: LCD: unknown symbol in '"..s.."' at "..i)
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if charmap[" "] ~= nil then
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file = charmap[" "]
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end
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i = i + 1
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end
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if file ~= nil then
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width = width + CHAR_WIDTH
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width = width + CHAR_WIDTH + 1
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table.insert(parsed, file)
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chars = chars + 1
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end
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@ -84,7 +151,7 @@ local generate_line = function(s, ypos)
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width = width - 1
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local texture = ""
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local xpos = math.floor((LCD_WITH - 2 * LCD_PADDING - width) / 2 + LCD_PADDING)
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local xpos = math.floor((LCD_WIDTH - width) / 2)
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for ii = 1, #parsed do
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texture = texture..":"..xpos..","..ypos.."="..parsed[ii]..".png"
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xpos = xpos + CHAR_WIDTH + 1
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@ -93,8 +160,8 @@ local generate_line = function(s, ypos)
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end
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local generate_texture = function(lines)
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local texture = "[combine:"..LCD_WITH.."x"..LCD_WITH
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local ypos = 16
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local texture = "[combine:"..LCD_WIDTH.."x"..LCD_WIDTH
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local ypos = math.floor((LCD_WIDTH - LINE_HEIGHT*NUMBER_OF_LINES) / 2)
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for i = 1, #lines do
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texture = texture..generate_line(lines[i], ypos)
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ypos = ypos + LINE_HEIGHT
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