Created
May 10, 2013 02:46
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Text with scrolling and wrapping support for LOVE 0.8.0
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--[[ | |
v0.91 text.lua | |
Copyright (c) 2013 Minh Ngo | |
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. | |
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
--]] | |
local path = (...):match('^.+[%.\\/]') or '' | |
require (path..'utf8') | |
local defaultFont = love.graphics.newFont() | |
local lg = love.graphics | |
local floor = math.floor | |
local abs = math.abs | |
local concat = table.concat | |
local insert = table.insert | |
local chunkpatterns= {'(%S+)','(\n)','([^%S\n]+)'} | |
local function multigmatch(str,patterns) | |
local startindex = 1 | |
return function() | |
local mini,chunk,newstart | |
for a,pattern in ipairs(patterns) do | |
local i,j,capture = str:find(pattern,startindex) | |
if i then | |
if mini and i < mini then | |
mini = i | |
chunk = capture | |
newstart = j+1 | |
elseif not mini then | |
mini = i | |
chunk = capture | |
newstart = j+1 | |
end | |
end | |
end | |
startindex = newstart | |
return chunk | |
end | |
end | |
local function createRowStrings(self,str) | |
local i = 1 | |
local currentrow = 1 | |
local rowstrings = self.rowstrings | |
local chunkCache = {} | |
local rowWidth = 0 | |
local width = self.width | |
local font = self.font | |
for chunk in multigmatch(str,chunkpatterns) do | |
if chunk ~= '\n' then | |
local chunkWidth = font:getWidth(chunk) | |
while chunkWidth > width do | |
local chunklen = chunk:utf8len() | |
local piecelen = floor((width-rowWidth)/chunkWidth*chunklen) | |
local piecechunk = chunk:utf8sub(1,piecelen) | |
while font:getWidth(piecechunk)+rowWidth > width do | |
piecelen = piecelen-1 | |
piecechunk = chunk:utf8sub(1,piecelen) | |
end | |
insert(chunkCache,piecechunk) | |
rowstrings[currentrow]= concat(chunkCache) | |
currentrow = currentrow+1 | |
rowWidth = 0 | |
chunkCache = {} | |
chunk = chunk:utf8sub(piecelen-chunklen) | |
chunkWidth = font:getWidth(chunk) | |
end | |
if chunkWidth+rowWidth > width then | |
rowstrings[currentrow]= (concat(chunkCache)):match '(.-)%s*$' | |
currentrow = currentrow+1 | |
local word = chunk:match('(%S+)') | |
rowWidth = word and chunkWidth or 0 | |
chunkCache = {word} | |
else | |
insert(chunkCache,chunk) | |
rowWidth = rowWidth+chunkWidth | |
end | |
else | |
rowstrings[currentrow]= concat(chunkCache) | |
currentrow = currentrow+1 | |
rowWidth = 0 | |
chunkCache = {} | |
end | |
end | |
rowstrings[currentrow]= concat(chunkCache) | |
end | |
local function cacheLengthsAndWidths(t) | |
for i,row in ipairs(t.rowstrings) do | |
local rowlen = row:utf8len() | |
t.__length = t.__length + rowlen | |
t.rowlengths[i]= rowlen | |
t.rowWidths[i] = t.font:getWidth(row) | |
end | |
end | |
--[[ | |
================================================= | |
CLASS | |
================================================= | |
--]] | |
local text = {} | |
text.__index = text | |
function text.new(str,width,font) | |
local t = {} | |
t.width = width | |
t.font = font or defaultFont | |
t.rowstrings = {} | |
t.rowlengths = {} | |
t.rowWidths = {} | |
t.align = nil | |
t.subalign = nil | |
t.heightspace = 0 | |
t.__length = 0 | |
t.startbottom = false | |
createRowStrings(t,str) | |
cacheLengthsAndWidths(t) | |
t.viewable = t.__length | |
return setmetatable(t,text) | |
end | |
--[[ | |
------------------------------------------------- | |
SETTER/GETTERS | |
------------------------------------------------- | |
--]] | |
function text:getString(row) | |
return row and self.rowstrings[row] or concat(self.rowstrings,'\n') | |
end | |
function text:iterateRows() | |
return ipairs(self.rowstrings) | |
end | |
function text:setViewable(length,rowoffset,startbottom) | |
length = length or self.__length | |
if length == 0 then error 'viewable length must be not be zero' end | |
self.startbottom = startbottom | |
local total = 0 | |
if rowoffset then | |
local factor = length < 0 and -1 or 1 | |
for i = 1,rowoffset-1 do | |
total = total + self.rowlengths[i]*factor | |
end | |
end | |
self.viewable = total + length | |
end | |
function text:getViewable() | |
return self.viewable or self.__length,self.startbottom | |
end | |
function text:setAlign(align,subalign) | |
self.align = align | |
self.subalign = subalign | |
end | |
function text:getAlign() | |
return self.align,self.subalign | |
end | |
function text:setHeightSpacing(spacing) | |
self.heightspace = spacing or 0 | |
end | |
function text:getHeightSpacing() | |
return self.heightspace | |
end | |
function text:getTotalHeight() | |
local totalrows = #self.rowstrings | |
return self.font:getHeight()*totalrows + self.heightspace*(totalrows-1) | |
end | |
function text:getLength(row) | |
return row and self.rowlengths[row] or self.__length | |
end | |
function text:getTotalRows() | |
return #self.rowstrings | |
end | |
function text:getFont() | |
return self.font | |
end | |
function text:getWidth(row) | |
return row and self.rowWidths[row] or self.width | |
end | |
--[[ | |
------------------------------------------------- | |
MAIN | |
------------------------------------------------- | |
--]] | |
function text:draw(x,y,r,sx,sy,ox,oy,kx,ky) | |
local oldfont = lg.getFont() or defaultFont | |
lg.setFont(self.font) | |
ox,oy = ox or 0,oy or 0 | |
local h = self.heightspace + self.font:getHeight() | |
local rs = self.rowstrings | |
local rw = self.rowWidths | |
local font = self.font | |
local width = self.width | |
local align = self.align | |
local subalign = self.subalign | |
local leftscroll= self.viewable < 0 | |
local remaining = self.viewable*(leftscroll and -1 or 1) | |
local i = self.startbottom and #rs or 1 | |
local oi = self.startbottom and -1 or 1 | |
while rs[i] do | |
local rowlen = self.rowlengths[i] | |
remaining = remaining-rowlen | |
local ox2,ox3= 0,0 | |
local str | |
if leftscroll then | |
str = remaining < 0 and rs[i]:utf8sub(rowlen-(rowlen+remaining),rowlen) or rs[i] | |
else | |
str = remaining < 0 and rs[i]:utf8sub(1,remaining+rowlen) or rs[i] | |
end | |
if align == 'center' then | |
ox2 = floor( (rw[i]-width)/2 ) | |
elseif align == 'right' then | |
ox2 = floor( rw[i]-width ) | |
end | |
if subalign == 'center' then | |
ox3 = floor( -(rw[i]-font:getWidth(str))/2 ) | |
elseif subalign == 'right' then | |
ox3 = floor( -(rw[i]-font:getWidth(str) ) ) | |
end | |
lg.print(str, x,y, r, sx,sy, ox+ox2+ox3,oy+(1-i)*h, kx,ky) | |
if remaining < 0 then break end | |
i = i + oi | |
end | |
lg.setFont(oldfont) | |
end | |
return text |
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