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@markandgo markandgo/text.lua
Created May 10, 2013

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Text with scrolling and wrapping support for LOVE 0.8.0
--[[
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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