function barChart( frame )
local res = {}
local args = frame.args -- can be changed to frame:getParent().args
local values, xlegends, colors, tooltips, yscales = {}, {}, {}, {} ,{}, {}, {}
local groupNames, unitsSuffix, unitsPrefix = {}, {}, {}
local width, height, stack, delimiter = 500, 350, false, ':'
local chartWidth, chartHeight, defcolor, scalePerGroup
local keywords = {
width = 'width',
height = 'height',
stack = 'stack',
colors = 'colors',
group = 'group',
xlegend = 'x legends',
tooltip = 'tooltip',
defcolor = 'default color',
scalePerGroup = 'scale per group',
unitsPrefix = 'units prefix',
unitsSuffix = 'units suffix',
groupNames = 'group names',
} -- here is where you want to translate
local numGroups, numValues
local scaleWidth
function nulOrWhitespace( s )
return not s or mw.text.trim( s ) == ''
end
function validate()
function asGroups( name, tab, toDuplicate, emptyOK )
if #tab == 0 and not emptyOK then
error( "must supply values for " .. keywords[name] )
end
if #tab == 1 and toDuplicate then
for i = 2, numGroups do tab[i] = tab[1] end
end
if #tab > 0 and #tab ~= numGroups then
error ( keywords[name] .. ' should contain the same number of items as the number of groups (' .. numGroups .. ')')
end
end
-- do all sorts of validation here, so we can assume all params are good from now on.
-- among other things, replace numerical values with mw.language:parseFormattedNumber() result
chartHeight = height - 80
numGroups = #values
numValues = #values[1]
defcolor = defcolor or 'blue'
colors[1] = colors[1] or defcolor
scaleWidth = scalePerGroup and 80 * numGroups or 100
chartWidth = width -scaleWidth
asGroups( 'unitsPrefix', unitsPrefix, true, true )
asGroups( 'unitsSuffix', unitsSuffix, true, true )
asGroups( 'colors', colors, true, true )
asGroups( 'groupNames', groupNames, false, false )
if stack and scalePerGroup then
error( string.format( 'Illegal settings: %s and %s are incompatible.', keyword.stack, keyword.scalePerGroup ) )
end
for gi = 2, numGroups do
if #values[gi] ~= numValues then error( keywords.group .. " " .. gi .. " does not have same number of values as " .. keywords.group .. " 1" ) end
end
if #xlegends ~= numValues then error( 'Illegal number of ' .. keywords.xlegend .. '. Should be exatly ' .. numValues ) end
end
function extractParams()
function testone( keyword, key, val, tab )
i = keyword == key and 0 or key:match( keyword .. "%s+(%d+)" )
if not i then return end
i = tonumber( i ) or error("Expect numerical index for key " .. keyword .. " instead of '" .. key .. "'")
if i > 0 then tab[i] = {} end
for s in mw.text.gsplit( val, '%s*' .. delimiter .. '%s*' ) do
table.insert( i == 0 and tab or tab[i], s )
end
return true
end
for k, v in pairs( args ) do
if k == keywords.width then
width = tonumber( v )
if not width or width < 200 then
error( 'Illegal width value (must be a number, and at least 200): ' .. v )
end
elseif k == keywords.height then
height = tonumber( v )
if not height or height < 200 then
error( 'Illegal height value (must be a number, and at least 200): ' .. v )
end
elseif k == keywords.stack then stack = true
elseif k == keywords.scalePerGroup then scalePerGroup = true
elseif k == keywords.defcolor then defcolor = v
else
for keyword, tab in pairs( {
group = values,
xlegend = xlegends,
colors = colors,
tooltip = tooltips,
unitsPrefix = unitsPrefix,
unitsSuffix = unitsSuffix,
groupNames = groupNames,
} ) do
if testone( keywords[keyword], k, v, tab )
then break
end
end
end
end
end
function roundup( x ) -- returns the next round number: eg., for 30 to 39.999 will return 40, for 3000 to 3999.99 wil return 4000. for 10 - 14.999 will return 15.
local ordermag = 10 ^ math.floor( math.log10( x ) )
local normalized = x / ordermag
local top = normalized >= 1.5 and ( math.floor( normalized + 1 ) ) or 1.5
return ordermag * top, top, ordermag
end
function calcHeightLimits() -- if limits were passed by user, use ithem, otherwise calculate. for "stack" there's only one limet.
if stack then
local sums = {}
for _, group in pairs( values ) do
for i, val in ipairs( group ) do sums[i] = ( sums[i] or 0 ) + val end
end
local sum = roundup( math.max( unpack( sums ) ) )
for i = 1, #values do yscales[i] = sum end
else
for i, group in ipairs( values ) do yscales[i] = math.max( unpack( group ) ) end
end
for i, scale in ipairs( yscales ) do yscales[i] = roundup( scale ) end
if not scalePerGroup then for i = 1, #values do yscales[i] = math.max( unpack( yscales ) ) end end
end
function tooltip( gi, i, val )
if tooltips and tooltips[gi] and not nulOrWhitespace( tooltips[gi][i] ) then return tooltips[gi][i] end
local groupName = not nulOrWhitespace( groupNames[gi] ) and groupNames[gi] .. ': ' or ''
local prefix = unitsPrefix[gi] or unitsPrefix[1] or ''
local suffix = unitsSuffix[gi] or unitsSuffix[1] or ''
return groupName .. prefix .. mw.getContentLanguage():formatNum( tonumber( val ) or 0 ) .. suffix
end
function calcHeights( gi, i, val )
local barHeight = math.floor( val / yscales[gi] * chartHeight )
local top, base = chartHeight - barHeight, 0
if stack then
local rawbase = 0
for j = 1, gi - 1 do rawbase = rawbase + values[j][i] end -- sum the "i" value of all the groups below our group, gi.
base = math.floor( chartHeight * rawbase / yscales[gi] ) -- normally, and especially if it's "stack", all the yscales must be equal.
end
return barHeight, top - base
end
function groupBounds( i )
local setWidth = math.floor( chartWidth / numValues )
local setOffset = ( i - 1 ) * setWidth
return setOffset, setWidth
end
function calcx( gi, i )
local setOffset, setWidth = groupBounds( i )
setWidth = 0.85 * setWidth
if stack then
local barWidth = math.min( 38, math.floor( 0.8 * setWidth ) )
return setOffset + (setWidth - barWidth) / 2, barWidth
end
local barWidth = math.floor( 0.75 * setWidth / numGroups )
local left = setOffset + math.floor( ( gi - 1 ) / numGroups * setWidth )
return left, barWidth
end
function drawbar( gi, i, val )
local color, tooltip = colors[gi] or defcolor or 'blue', tooltip( gi, i, val )
local left, barWidth = calcx( gi, i )
local barHeight, top = calcHeights( gi, i, val )
local style = string.format("position:absolute;left:%spx;top:%spx;height:%spx;min-width:%spx;max-width:%spx;background-color:%s;box-shadow:4px -3px 3px 1px grey;",
left, top, barHeight, barWidth, barWidth, color)
table.insert( res, mw.text.tag( 'div', { style = style, title = tooltip, }, "" ) )
end
function drawYScale()
function drawSingle( gi, color, width, single )
local yscale = yscales[gi]
local _, top, ordermag = roundup( yscale * 0.999 )
local numnotches = top <= 1.5 and top * 4
or top < 4 and top * 2
or top
local valStyleStr =
single and 'position:absolute;height=20px;text-align:right;vertical-align:middle;width:%spx;top:%spx;padding:0 2px'
or 'position:absolute;height=20px;text-align:right;vertical-align:middle;width:%spx;top:%spx;left:3px;background-color:%s;color:white;font-weight:bold;text-shadow:-1px -1px 0 #000,1px -1px 0 #000,-1px 1px 0 #000,1px 1px 0 #000;padding:0 2px'
local notchStyleStr = 'position:absolute;height=1px;min-width:5px;top:%spx;left:%spx;border:1px solid %s;'
for i = 1, numnotches do
local val = i / numnotches * yscale
local y = chartHeight - calcHeights( gi, 1, val )
local div = mw.text.tag( 'div', { style = string.format( valStyleStr, width - 10, y - 10, color ) }, mw.getContentLanguage():formatNum( tonumber( val ) or 0 ) )
table.insert( res, div )
div = mw.text.tag( 'div', { style = string.format( notchStyleStr, y, width - 4, color ) }, '' )
table.insert( res, div )
end
end
if scalePerGroup then
local colWidth = 80
local colStyle = "position:absolute;height:%spx;min-width:%spx;left:%spx;border-right:1px solid %s;color:%s"
for gi = 1, numGroups do
local left = ( gi - 1 ) * colWidth
local color = colors[gi] or defcolor
table.insert( res, mw.text.tag( 'div', { style = string.format( colStyle, chartHeight, colWidth, left, color, color ) } ) )
drawSingle( gi, color, colWidth )
table.insert( res, '</div>' )
end
else
drawSingle( 1, 'black', scaleWidth, true )
end
end
function drawXlegends()
local setOffset, setWidth
local legendDivStyleFormat = "position:absolute;left:%spx;top:10px;min-width:%spx;max-width:%spx;text-align:center;veritical-align:top;"
local tickDivstyleFormat = "position:absolute;left:%spx;height:10px;width:1px;border-left:1px solid black;"
for i = 1, numValues do
if not nulOrWhitespace( xlegends[i] ) then
setOffset, setWidth = groupBounds( i )
-- setWidth = 0.85 * setWidth
table.insert( res, mw.text.tag( 'div', { style = string.format( legendDivStyleFormat, setOffset - 5, setWidth - 10, setWidth - 10 ) }, xlegends[i] or '' ) )
table.insert( res, mw.text.tag( 'div', { style = string.format( tickDivstyleFormat, setOffset + setWidth / 2 ) }, '' ) )
end
end
end
function printGroupList()
if #groupNames > 1 then
local list = {}
local spanStyle = "padding:0 1em;background-color:%s"
for gi = 1, #groupNames do
local span = mw.text.tag( 'span', { style = string.format( spanStyle, colors[gi] ) }, ' ' ) .. ' '.. groupNames[gi]
table.insert( list, mw.text.tag( 'li', {}, span ) )
end
table.insert( res, mw.text.tag( 'ul', {}, table.concat( list, '\n' ) ) )
end
end
function drawChart()
table.insert( res, mw.text.tag( 'div', { style = string.format( 'max-width:%spx;', width ) } ) )
table.insert( res, mw.text.tag( 'div', { style = string.format("position:relative;min-height:%spx;min-width:%spx;max-width:%spx;", height, width, width ) } ) )
table.insert( res, mw.text.tag( 'div', { style = string.format("float:right;position:relative;min-height:%spx;min-width:%spx;max-width:%spx;border-left:1px black solid;border-bottom:1px black solid;", chartHeight, chartWidth, chartWidth ) } ) )
for gi, group in pairs( values ) do
for i, val in ipairs( group ) do
drawbar( gi, i, val )
end
end
table.insert( res, '</div>' )
table.insert( res, mw.text.tag( 'div', { style = string.format("position:absolute;height:%spx;min-width:%spx;max-width:%spx;", chartHeight, scaleWidth, scaleWidth, scaleWidth ) } ) )
drawYScale()
table.insert( res, '</div>' )
table.insert( res, mw.text.tag( 'div', { style = string.format( "position:absolute;top:%spx;left:%spx;width:%spx;", chartHeight, scaleWidth, chartWidth ) } ) )
drawXlegends()
table.insert( res, '</div>' )
table.insert( res, '</div>' )
printGroupList()
table.insert( res, '</div>' )
end
extractParams()
validate()
calcHeightLimits()
drawChart()
return table.concat( res, "\n" )
end
return { ['bar-chart'] = barChart }
