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justify.lua
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justify.lua
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-- justify.lua
--
-- The MIT License (MIT)
-- Copyright (c) 2014 Ingemar Bergmark, Swipeware
-- 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 justifyFull = function(options)
assert(options.text, "No text specified.")
options.maxWidth = options.maxWidth or display.contentWidth
options.font = options.font or native.systemFont
options.fontSize = options.fontSize or 12
options.fillColor = options.fillColor or {1}
local words = {}
-- divide string into words
for word in options.text:gmatch("[^%s]+") do
words[#words + 1] = word
end
-- set up intermediary text object
local tmp = display.newText {
text = " ",
font = options.font,
fontSize = options.fontSize
}
-- create individual text objects for each word
local output = {}
local lineCount = 0
local lineLength = 99999999
local spaceWidth = tmp.width
for i = 1, #words do
tmp.text = words[i]
if (lineLength + tmp.width > options.maxWidth) then
if (lineCount > 0) then
output[lineCount].full = true
end
lineLength = 0
lineCount = lineCount + 1
output[lineCount] = {}
output[lineCount].words = {}
output[lineCount].length = 0
output[lineCount].full = false
end
local index = #output[lineCount].words + 1
output[lineCount].words[index] = display.newText {
text = words[i],
font = options.font,
fontSize = options.fontSize
}
output[lineCount].words[index]:setFillColor(unpack(options.fillColor))
output[lineCount].words[index].anchorX = ((options.rtl == true) and 1 or 0)
output[lineCount].length = output[lineCount].length + tmp.width
lineLength = lineLength + tmp.width + spaceWidth
end
tmp:removeSelf()
-- create lineGroup with justified text
local lineGroup = display.newGroup()
local lineHeight = output[1].words[1].height -- get height from first word
local newY = lineHeight / 2 -- adjust text downwards
for lineNumber, line in pairs(output) do
local index = #lineGroup + 1
local newX = (options.rtl == true) and options.maxWidth or 0
local lineSpaceWidth = spaceWidth
if (line.full) then
lineSpaceWidth = (options.maxWidth - line.length) / (#line.words - 1)
end
for wordNumber, word in pairs(line.words) do
lineGroup:insert(word)
word.x = newX
word.y = newY
newX = newX + (word.width + lineSpaceWidth) * ((options.rtl == true) and -1 or 1)
end
newY = newY + lineHeight
end
return lineGroup
end
local public = {}
public.justifyFull = justifyFull
return public