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|
--
-- This file contains parts of pgfplotscoordprocessing.code.tex and pgfplotsplothandlers.code.tex .
--
-- It contains
--
-- pgfplots.Axis
-- pgfplots.Coord
-- pgfplots.Plothandler
--
-- and some related classes.
local math=math
local pgfplotsmath = pgfplots.pgfplotsmath
local type=type
local tostring=tostring
local error=error
local table=table
local pgfmathparse = pgfplots.pgfluamathparser.pgfmathparse
do
-- all globals will be read from/defined in pgfplots:
local _ENV = pgfplots
-----------------------------------
local pgftonumber =pgfluamathfunctions.tonumber
Coord = newClass()
function Coord:constructor()
self.x = { nil, nil, nil }
self.unboundedDir = nil
self.meta= nil
self.metatransformed = nil -- assigned during vis phase only
self.unfiltered = nil
self.pgfXY = nil -- assigned during visphase only
return self
end
function Coord:copy(other)
for i = 1,#other.x do self.x[i] = other.x[i] end
self.meta = other.meta
self.metatransformed = other.metatransformed
self.unfiltered = nil -- not needed
end
function Coord:__tostring()
local result = '(' .. stringOrDefault(self.x[1], "--") ..
',' .. stringOrDefault(self.x[2], "--") ..
',' .. stringOrDefault(self.x[3], "--") ..
') [' .. stringOrDefault(self.meta, "--") .. ']'
if not self.x[1] and self.unfiltered then
result = result .. "(was " .. tostring(self.unfiltered) .. ")"
end
return result
end
local stringToFunctionMap = pgfluamathfunctions.stringToFunctionMap
-- a reference to a Coord which is returned by math expressions involving 'x', 'y', or 'z'
-- see surveystart()
local pseudoconstant_pt = nil
local function pseudoconstant_x() return pseudoconstant_pt.x[1] end
local function pseudoconstant_y() return pseudoconstant_pt.x[2] end
local function pseudoconstant_z() return pseudoconstant_pt.x[3] end
local function pseudoconstant_rawx() return pgftonumber(pseudoconstant_pt.unfiltered.x[1]) end
local function pseudoconstant_rawy() return pgftonumber(pseudoconstant_pt.unfiltered.x[2]) end
local function pseudoconstant_rawz() return pgftonumber(pseudoconstant_pt.unfiltered.x[3]) end
local function pseudoconstant_meta() return pseudoconstant_pt.meta end
-- @return the old value
local function updatePseudoConstants(pt)
local old = pseudoconstant_pt
pseudoconstant_pt = pt
return old
end
-------------------------------------------------------
LinearMap = newClass()
-- A map such that
-- [inMin,inMax] is mapped linearly to [outMin,outMax]
--
function LinearMap:constructor(inMin, inMax, outMin, outMax)
if not inMin or not inMax or not outMin or not outMax then error("arguments must not be nil") end
if inMin == inMax then
self.map = function (x) return inMin end
else
if inMin > inMax then error("linear map received invalid input domain " .. tostring(inMin) .. ":" .. tostring(inMax)) end
self.offset = outMin - (outMax-outMin)*inMin/(inMax-inMin)
self.scale = (outMax-outMin)/(inMax-inMin)
end
end
function LinearMap:map(x)
return x*self.scale + self.offset
end
PointMetaMap = newClass()
function PointMetaMap:constructor(inMin,inMax, warnForfilterDiscards)
if not inMin or not inMax or warnForfilterDiscards == nil then error("arguments must not be nil") end
self._mapper = LinearMap.new(inMin,inMax, 0, 1000)
self.warnForfilterDiscards = warnForfilterDiscards
end
function PointMetaMap:map(meta)
if pgfplotsmath.isfinite(meta) then
local result = self._mapper:map(meta)
result = math.max(0, result)
result = math.min(1000, result)
return result
else
if self.warnForfilterDiscards then
log("The per point meta data '" .. tostring(meta) .. " (and probably others as well) is unbounded - using the minimum value instead.\n")
self.warnForfilterDiscards=false
end
return 0
end
end
-------------------------------------------------------
-- Abstract base class of all plot handlers.
-- It offers basic functionality for the survey phase.
Plothandler = newClass()
-- @param name the plot handler's name (a string)
-- @param axis the parent axis
-- @param pointmetainputhandler an instance of PointMetaHandler or nil if there is none
function Plothandler:constructor(name, axis, pointmetainputhandler)
if not name or not axis then
error("arguments must not be nil")
end
self.axis = axis
self.config = PlothandlerConfig.new()
self.name = name
self.coordindex = 0
self.metamin = math.huge
self.metamax = -math.huge
self.autocomputeMetaMin = true
self.autocomputeMetaMax = true
self.coords = {}
self.pointmetainputhandler = pointmetainputhandler
self.pointmetamap = nil -- will be set later
self.filteredCoordsAway = false
self.plotHasJumps = false
-- will be set before the visualization phase starts. At least.
self.plotIs3d = false
return self
end
function Plothandler:__tostring()
return 'plot handler ' .. self.name
end
-- @see \pgfplotsplothandlersurveybeforesetpointmeta
function Plothandler:surveyBeforeSetPointMeta()
end
-- @see \pgfplotsplothandlersurveyaftersetpointmeta
function Plothandler:surveyAfterSetPointMeta()
end
-- PRIVATE
--
-- appends a fully surveyed point
function Plothandler:addSurveyedPoint(pt)
table.insert(self.coords, pt)
-- log("addSurveyedPoint(" .. tostring(pt) .. ") ...\n")
end
-- PRIVATE
--
-- assigns the point meta value by means of the PointMetaHandler
function Plothandler:setperpointmeta(pt)
if pt.meta == nil and self.pointmetainputhandler ~= nil then
self.pointmetainputhandler:assign(pt)
end
end
-- PRIVATE
--
-- updates point meta limits
function Plothandler:setperpointmetalimits(pt)
if pt.meta ~= nil then
if not type(pt.meta) == 'number' then error("got unparsed input "..tostring(pt)) end
if self.autocomputeMetaMin then
self.metamin = math.min(self.metamin, pt.meta )
end
if self.autocomputeMetaMax then
self.metamax = math.max(self.metamax, pt.meta )
end
end
end
-- @see \pgfplotsplothandlersurveystart
function Plothandler:surveystart()
stringToFunctionMap["x"] = pseudoconstant_x
stringToFunctionMap["y"] = pseudoconstant_y
stringToFunctionMap["z"] = pseudoconstant_z
stringToFunctionMap["rawx"] = pseudoconstant_rawx
stringToFunctionMap["rawy"] = pseudoconstant_rawy
stringToFunctionMap["rawz"] = pseudoconstant_rawz
stringToFunctionMap["meta"] = pseudoconstant_meta
end
-- @see \pgfplotsplothandlersurveyend
-- returns executable TeX code to communicate return values.
function Plothandler:surveyend()
-- empty by default.
return ""
end
-- @see \pgfplotsplothandlersurveypoint
function Plothandler:surveypoint(pt)
updatePseudoConstants(nil)
local updateLimits = self.config.updateLimits
local current = self.axis:parsecoordinate(pt, self.config.filterExpressionByDir)
-- this here defines the math functions for x, y, or z.
-- FIXME: are there any hidden callers which rely on these constants in parsecoordinate!?
updatePseudoConstants(current)
if current.x[1] ~= nil then
current = self.axis:preparecoordinate(current)
if updateLimits then
self.axis:updatelimitsforcoordinate(current)
end
end
self.axis:datapointsurveyed(current, self)
self.coordindex = self.coordindex + 1;
end
-- PUBLIC
--
-- @return a string containing all surveyed coordinates in the format which is accepted \pgfplotsaxisdeserializedatapointfrom
function Plothandler:surveyedCoordsToPgfplots(axis)
return self:getCoordsInTeXFormat(axis, self.coords)
end
-- PUBLIC
--
-- @return a string containing all coordinates in the format which is accepted \pgfplotsaxisdeserializedatapointfrom
-- @param extraSerializer a function which takes an instance of Coord and returns a string. can be nil.
function Plothandler:getCoordsInTeXFormat(axis, coords, extraSerializer)
if not axis then error("arguments must not be nil") end
local result = {}
for i = 1,#coords,1 do
local pt = coords[i]
local ptstr = self:serializeCoordToPgfplots(pt)
local axisPrivate = axis:serializeCoordToPgfplotsPrivate(pt)
if extraSerializer then
axisPrivate = extraSerializer(pt) .. "{" .. axisPrivate .. "}"
end
local serialized = "{" .. axisPrivate .. ";" .. ptstr .. "}"
table.insert(result, serialized)
end
return table.concat(result)
end
-- PRIVATE
--
-- does the same as \pgfplotsplothandlerserializepointto
function Plothandler:serializeCoordToPgfplots(pt)
return
toTeXstring(pt.x[1]) .. "," ..
toTeXstring(pt.x[2]) .. "," ..
toTeXstring(pt.x[3])
end
function Plothandler:visualizationPhaseInit()
if self.pointmetainputhandler ~=nil then
local rangeMin
local rangeMax
if self.config.pointmetarel == PointMetaRel.axiswide then
rangeMin = self.axis.axiswidemetamin
rangeMax = self.axis.axiswidemetamax
else
rangeMin = self.metamin
rangeMax = self.metamax
end
self.pointmetamap = PointMetaMap.new(rangeMin, rangeMax, self.config.warnForfilterDiscards)
end
end
-- PRECONDITION: visualizationPhaseInit() has been called some time before.
function Plothandler:visualizationTransformMeta(meta)
if meta == nil then
log("could not access the 'point meta' (used for example by scatter plots and color maps). Maybe you need to add '\\addplot[point meta=y]' or something like that?\n")
return 1
else
return self.pointmetamap:map(meta)
end
end
-- Modifies coords inplace.
-- @return nothing.
-- see \pgfplots@apply@zbuffer@sort@coordinates
function Plothandler:sortCoordinatesByViewDepth()
local coords = self.coords
local axis = self.axis
local viewdir = axis.viewdir
-- Step 1: compute view depth for every coordinate
local getVertexDepth = axis.getVertexDepth
for i=1,#coords do
local vertexDepth = getVertexDepth(axis,coords[i])
coords[i].vertexDepth = vertexDepth
end
-- Step 2: sort (inplace)
local comparator = function(ptA, ptB)
return ptA.vertexDepth > ptB.vertexDepth
end
table.sort(coords, comparator)
-- Step 3: cleanup: do not leave 'vertexDepth' inside of the array
for i=1,#coords do
coords[i].vertexDepth = nil
end
end
-------------------------------------------------------
-- Generic plot handler: one which has the default survey phase
-- It is actually the same as Plothandler...
GenericPlothandler = newClassExtends(Plothandler)
function GenericPlothandler:constructor(name, axis, pointmetainputhandler)
Plothandler.constructor(self,name, axis, pointmetainputhandler)
end
-------------------------------------------------------
UnboundedCoords = { discard="d", jump="j" }
PointMetaRel = { axiswide = 0, perplot =1 }
-- contains static configuration entities.
PlothandlerConfig = newClass()
function PlothandlerConfig:constructor()
self.unboundedCoords = UnboundedCoords.discard
self.warnForfilterDiscards=true
self.pointmetarel = PointMetaRel.axiswide
self.updateLimits = true
self.filterExpressionByDir = {"", "", ""}
return self
end
-------------------------------------------------------
-- a PlotVisualizer takes an input Plothandler and visualizes its results.
--
-- "Visualize" can mean
-- * apply the plot handler's default visualization phase
-- * visualize just plot marks at each of the collected coordinates
-- * visualize just error bars at each collected coordinate
-- * ...
--
-- this class offers basic visualization support. "Basic" means that it will merely transform and finalize input coordinates.
PlotVisualizer = newClass()
-- @param sourcePlotHandler an instance of Plothandler
function PlotVisualizer:constructor(sourcePlotHandler)
if not sourcePlotHandler then error("arguments must not be nil") end
self.axis = sourcePlotHandler.axis
self.sourcePlotHandler=sourcePlotHandler
if sourcePlotHandler.plotIs3d then
self.qpointxyz = self.axis.qpointxyz
else
self.qpointxyz = self.axis.qpointxy
end
end
-- Visualizes the results.
--
-- @return any results. The format of the results is currently a list of Coord, but I am unsure of whether it will stay this way.
--
-- Note that a PlotVisualizer does _not_ modify self.sourcePlotHandler.coords
function PlotVisualizer:getVisualizationOutput()
local result = {}
local coords = self.sourcePlotHandler.coords
-- standard z buffer choices (not mesh + sort) is currently handled in TeX
-- as well as other preparations
-- FIXME : stacked plots?
-- FIXME : error bars?
for i = 1,#coords do
local result_i
local result_i = Coord.new()
result_i:copy(coords[i])
if result_i.x[1] ~= nil then
self:visphasegetpoint(result_i)
else
self:notifyJump(result_i)
end
result[i] = result_i
end
return result
end
-- PROTECTED
-- resembles \pgfplotsplothandlervisualizejump -- or at least that part which can be done in LUA.
-- It does not visualize anything, but it can be used to modify the coordinate
function PlotVisualizer:notifyJump(pt)
-- do nothing.
end
function PlotVisualizer:visphasegetpoint(pt)
pt.untransformed = {}
for j = 1,#pt.x do
pt.untransformed[j] = pt.x[j]
end
self.axis:visphasetransformcoordinate(pt)
-- FIXME : prepare data point (only for stacked)
pt.pgfXY = self.qpointxyz(pt.x)
end
-------------------------------------------------------
-- An abstract base class for a handler of point meta.
-- @see \pgfplotsdeclarepointmetasource
PointMetaHandler = newClass()
-- @param isSymbolic
-- expands to either '1' or '0'
-- A numeric source will be processed numerically in float
-- arithmetics. Thus, the output of the @assign routine should be
-- a macro \pgfplots@current@point@meta in float format.
--
-- The output of a numeric point meta source will result in meta
-- limit updates and the final map to [0,1000] will be
-- initialised automatically.
--
-- A symbolic input routine won't be processed.
-- Default is '0'
--
-- @param explicitInput
-- expands to either
-- '1' or '0'. In case '1', it expects explicit input from the
-- coordinate input routines. For example, 'plot file' will look for
-- further input after the x,y,z coordinates.
-- Default is '0'
--
function PointMetaHandler:constructor(isSymbolic, explicitInput)
self.isSymbolic =isSymbolic
self.explicitInput = explicitInput
return self
end
-- During the survey phase, this macro is expected to assign
-- \pgfplots@current@point@meta
-- if it is a numeric input method, it should return a
-- floating point number.
-- It is allowed to return an empty string to say "there is no point
-- meta".
-- PRECONDITION for '@assign':
-- - the coordinate input method has already assigned its
-- '\pgfplots@current@point@meta' (probably as raw input string).
-- - the other input coordinates are already read.
-- POSTCONDITION for '@assign':
-- - \pgfplots@current@point@meta is ready for use:
-- - EITHER a parsed floating point number
-- - OR an empty string,
-- - OR a symbolic string (if the issymbolic boolean is true)
-- The default implementation is
-- \let\pgfplots@current@point@meta=\pgfutil@empty
--
function PointMetaHandler.assign(pt)
error("This instance of PointMetaHandler is not implemented")
end
-- A PointMetaHandler which merely acquires values of either x,y, or z.
CoordAssignmentPointMetaHandler = newClassExtends( PointMetaHandler )
function CoordAssignmentPointMetaHandler:constructor(dir)
PointMetaHandler.constructor(self, false,false)
if not dir then error "nil argument for 'dir' is unsupported." end
self.dir=dir
end
function CoordAssignmentPointMetaHandler:assign(pt)
if not pt then error("arguments must not be nil") end
pt.meta = pgftonumber(pt.x[self.dir])
end
XcoordAssignmentPointMetaHandler = CoordAssignmentPointMetaHandler.new(1)
YcoordAssignmentPointMetaHandler = CoordAssignmentPointMetaHandler.new(2)
ZcoordAssignmentPointMetaHandler = CoordAssignmentPointMetaHandler.new(3)
-- A class of PointMetaHandler which takes the 'Coord.meta' as input
ExplicitPointMetaHandler = newClassExtends( PointMetaHandler )
function ExplicitPointMetaHandler:constructor()
PointMetaHandler.constructor(self, false,true)
end
function ExplicitPointMetaHandler:assign(pt)
if pt.unfiltered ~= nil and pt.unfiltered.meta ~= nil then
pt.meta = pgftonumber(pt.unfiltered.meta)
end
end
-- a point meta handler which evaluates a math expression.
-- ATTENTION: the expression cannot depend on TeX macro values
ExpressionPointMetaHandler = newClassExtends( PointMetaHandler )
-- @param expression an expression. It can rely on functions which are only available in plot context (in plot expression, x and y are typically defined)
function ExpressionPointMetaHandler:constructor(expression)
PointMetaHandler.constructor(self, false,false)
self.expression = expression
end
function ExpressionPointMetaHandler:assign(pt)
pt.meta = pgfmathparse(self.expression)
if not pt.meta then
error("point meta=" .. self.expression .. ": expression has been rejected.")
end
end
-------------------------------------------------------
DatascaleTrafo = newClass()
function DatascaleTrafo:constructor(exponent, shift)
self.exponent=exponent
self.shift=shift
self.scale = math.pow(10, exponent)
end
function DatascaleTrafo:map(x)
return self.scale * x - self.shift
end
-------------------------------------------------------
-- An axis.
Axis = newClass()
function Axis:constructor()
self.is3d = false
self.clipLimits = true
self.autocomputeAllLimits = true -- FIXME : redundant!?
self.autocomputeMin = { true, true, true }
self.autocomputeMax = { true, true, true }
self.isLinear = { true, true, true }
self.min = { math.huge, math.huge, math.huge }
self.max = { -math.huge, -math.huge, -math.huge }
self.datamin = { math.huge, math.huge, math.huge }
self.datamax = { -math.huge, -math.huge, -math.huge }
self.axiswidemetamin = { math.huge, math.huge }
self.axiswidemetamax = { -math.huge, -math.huge }
-- will be populated by the TeX code:
self.plothandlers = {}
-- needed during visualization phase:
self.datascaleTrafo={}
-- needed during visualization phase: a vector of 3 elements, each is a vector of 2 elements.
-- self.unitvectors[1] is (\pgf@xx,\pgf@xy)
self.unitvectors={}
-- needed during visualization phase -- but only for 3d!
self.viewdir = {}
return self
end
function Axis:getVertexDepth(pt)
local vertexDepth = 0
local vertex = pt.x
local viewdir = self.viewdir
if vertex[1] == nil then
-- an empty coordinate. Get rid of it.
return 0
end
if #vertex ~=3 then
error("Cannot compute vertex depth of " .. tostring(pt) .. ": expected a 3d point but got " .. tostring(#vertex))
end
if not viewdir or #viewdir~=3 then error("got unexpected view dir " ..tostring(viewdir) ) end
for k = 1,3 do
local component = vertex[k]
vertexDepth = vertexDepth + component*viewdir[k]
end
return vertexDepth
end
function Axis:setunitvectors(unitvectors)
if not unitvectors or #unitvectors ~= 3 then error("got illegal arguments " .. tostring(unitvectors)) end
self.unitvectors = unitvectors
local pgfxx = unitvectors[1][1]
local pgfxy = unitvectors[1][2]
local pgfyx = unitvectors[2][1]
local pgfyy = unitvectors[2][2]
local pgfzx = unitvectors[3][1]
local pgfzy = unitvectors[3][2]
self.qpointxyz = function(xyz)
local result = {}
result[1] = xyz[1] * pgfxx + xyz[2] * pgfyx + xyz[3] * pgfzx
result[2] = xyz[1] * pgfxy + xyz[2] * pgfyy + xyz[3] * pgfzy
return result
end
if pgfxy==0 and pgfyx ==0 then
self.qpointxy = function(xy)
local result = {}
result[1] = xy[1] * pgfxx
result[2] = xy[2] * pgfyy
return result
end
else
self.qpointxy = function(xyz)
local result = {}
result[1] = xyz[1] * pgfxx + xyz[2] * pgfyx
result[2] = xyz[1] * pgfxy + xyz[2] * pgfyy
return result
end
end
end
-- PRIVATE
--
-- applies user transformations and logs
--
-- @see \pgfplots@prepared@xcoord
function Axis:preparecoord(dir, value)
-- FIXME : user trafos, logs (switches off LUA backend)
return value
end
function Axis:filtercoord(dir, ptCoords, filterExpressionByDir)
if not dir or not ptCoords or not filterExpressionByDir then error("Arguments must not be nil") end
local result = ptCoords.x[dir]
if filterExpressionByDir[dir]:len() > 0 then
for j = 1,#ptCoords.x do
ptCoords.x[j] = pgftonumber(ptCoords.x[j])
end
local old = updatePseudoConstants(ptCoords)
result = pgfmathparse(filterExpressionByDir[dir])
updatePseudoConstants(old)
end
return result
end
-- PRIVATE
-- @see \pgfplotsaxisserializedatapoint@private
function Axis:serializeCoordToPgfplotsPrivate(pt)
return toTeXstring(pt.meta)
end
-- PRIVATE
--
function Axis:validatecoord(dir, point)
if not dir or not point then error("arguments must not be nil") end
local result = pgftonumber(point.x[dir])
if result == nil then
result = nil
elseif result == pgfplotsmath.infty or result == -pgfplotsmath.infty or pgfplotsmath.isnan(result) then
result = nil
point.unboundedDir = dir
end
point.x[dir] = result
end
-- PRIVATE
--
-- @see \pgfplotsaxisparsecoordinate
function Axis:parsecoordinate(pt, filterExpressionByDir)
-- replace empty strings by 'nil':
for i = 1,3 do
pt.x[i] = stringOrDefault(pt.x[i], nil)
end
pt.meta = stringOrDefault(pt.meta)
if pt.x[3] ~= nil then
self.is3d = true
end
local result = Coord.new()
local unfiltered = Coord.new()
unfiltered.x = {}
unfiltered.meta = pt.meta
for i = 1,3 do
unfiltered.x[i] = pt.x[i]
end
result.unfiltered = unfiltered
-- copy values such that filtercoord can access them in the same order as the TeX impl.
for i = 1,self:loopMax() do
result.x[i] = pt.x[i]
end
-- FIXME : self:prefilter(pt[i])
for i = 1,self:loopMax() do
result.x[i] = self:preparecoord(i, pt.x[i])
result.x[i] = self:filtercoord(i, result, filterExpressionByDir)
end
-- FIXME : result.x = self:xyzfilter(result.x)
for i = 1,self:loopMax() do
self:validatecoord(i, result)
end
local resultIsBounded = true
for i = 1,self:loopMax() do
if result.x[i] == nil then
resultIsBounded = false
end
end
if not resultIsBounded then
result.x = { nil, nil, nil}
end
return result
end
-- PROTECTED
--
-- @see \pgfplotsaxispreparecoordinate
function Axis:preparecoordinate(pt)
-- the default "preparation" is to return it as is (no number parsing)
--
-- FIXME : data cs! Stacking!
return pt
end
-- PRIVATE
--
-- returns either 2 if this axis is 2d or 3 otherwise
--
-- FIXME : shouldn't this depend on the current plot handler!?
function Axis:loopMax()
if self.is3d then return 3 else return 2 end
end
-- PRIVATE:
--
-- updates axis limits for pt
-- @param pt an instance of Coord
function Axis:updatelimitsforcoordinate(pt)
local isClipped = false
if self.clipLimits then
for i = 1,self:loopMax(),1 do
if not self.autocomputeMin[i] then
isClipped = isClipped or pt.x[i] < self.min[i]
end
if not self.autocomputeMax[i] then
isClipped = isClipped or pt.x[i] > self.max[i]
end
end
end
if not isClipped then
for i = 1,self:loopMax(),1 do
if self.autocomputeMin[i] then
self.min[i] = math.min(pt.x[i], self.min[i])
end
if self.autocomputeMax[i] then
self.max[i] = math.max(pt.x[i], self.max[i])
end
end
end
-- Compute data range:
if self.autocomputeAllLimits then
-- the data range will be acquired simply from the axis
-- range, see below!
else
for i = 1,self:loopMax(),1 do
self.datamin[i] = math.min(pt.x[i], self.min[i])
self.datamax[i] = math.max(pt.x[i], self.max[i])
end
end
end
-- PRIVATE
--
-- unfinished, see its fixmes
function Axis:addVisualizationDependencies(pt)
-- FIXME : 'visualization depends on'
-- FIXME : 'execute for finished point'
return pt
end
-- PROTECTED
--
-- indicates that a data point has been surveyed by the axis and that it can be consumed
function Axis:datapointsurveyed(pt, plothandler)
if not pt or not plothandler then error("arguments must not be nil") end
if pt.x[1] ~= nil then
plothandler:surveyBeforeSetPointMeta()
plothandler:setperpointmeta(pt)
plothandler:setperpointmetalimits(pt)
plothandler:surveyAfterSetPointMeta()
-- FIXME : error bars
-- FIXME: collect first plot as tick
-- note that that TeX code would also remember the first/last coordinate in a stream.
-- This is unnecessary here.
local serialized = self:addVisualizationDependencies(pt)
plothandler:addSurveyedPoint(serialized)
else
-- COORDINATE HAS BEEN FILTERED AWAY
if plothandler.config.unboundedCoords == UnboundedCoords.discard then
plothandler.filteredCoordsAway = true
if plothandler.config.warnForfilterDiscards then
local reason
if pt.unboundedDir == nil then
reason = "of a coordinate filter."
else
reason = "it is unbounding (in " .. tostring(pt.unboundedDir) .. ")."
end
log("NOTE: coordinate " .. tostring(pt) .. " has been dropped because " .. reason .. "\n")
end
elseif plothandler.config.unboundedCoords == UnboundedCoords.jump then
if pt.unboundedDir == nil then
plothandler.filteredCoordsAway = true
if plothandler.config.warnForfilterDiscards then
local reason = "of a coordinate filter."
log("NOTE: coordinate " .. tostring(pt) .. " has been dropped because " .. reason .. "\n")
end
else
plothandler.plotHasJumps = true
local serialized = self:addVisualizationDependencies(pt)
plothandler:addSurveyedPoint(serialized)
end
end
end
-- note that the TeX variant would increase the coord index here.
-- We do it it surveypoint.
end
local function axisLimitToTeXString(name, value)
if value == math.huge or value == -math.huge then
return ""
end
return "\\gdef" .. name .. "{" .. toTeXstring(value) .. "}"
end
local function toTeXxyzCoord(namePrefix, pt )
local x = toTeXstring(pt.x[1])
local y = toTeXstring(pt.x[2])
local z = toTeXstring(pt.x[3])
return
"\\gdef" .. namePrefix .. "@x{" .. x .. "}" ..
"\\gdef" .. namePrefix .. "@y{" .. y .. "}" ..
"\\gdef" .. namePrefix .. "@z{" .. z .. "}";
end
local function findFirstValidCoord(coords)
for i=1,#coords do
local pt = coords[i]
if pt.x[1] ~=nil then
return pt
end
end
return nil
end
local function findLastValidCoord(coords)
for i=#coords,1,-1 do
local pt = coords[i]
if pt.x[1] ~=nil then
return pt
end
end
return nil
end
-- PUBLIC
--
-- @return a set of (private) key-value pairs such that the TeX code of pgfplots can
-- access survey results of the provided plot handler
--
-- @param plothandler an instance of Plothandler
function Axis:surveyToPgfplots(plothandler)
local plothandlerResult = plothandler:surveyend()
local firstCoord = findFirstValidCoord(plothandler.coords) or Coord.new()
local lastCoord = findLastValidCoord(plothandler.coords) or Coord.new()
local result =
plothandlerResult ..
toTeXxyzCoord("\\pgfplots@currentplot@firstcoord", firstCoord) ..
toTeXxyzCoord("\\pgfplots@currentplot@lastcoord", lastCoord) ..
axisLimitToTeXString("\\pgfplots@metamin", plothandler.metamin) ..
axisLimitToTeXString("\\pgfplots@metamax", plothandler.metamax) ..
"\\c@pgfplots@coordindex=" .. tostring(plothandler.coordindex) .. " " ..
axisLimitToTeXString("\\pgfplots@xmin", self.min[1]) ..
axisLimitToTeXString("\\pgfplots@ymin", self.min[2]) ..
axisLimitToTeXString("\\pgfplots@xmax", self.max[1]) ..
axisLimitToTeXString("\\pgfplots@ymax", self.max[2]);
if self.is3d then
result = result ..
axisLimitToTeXString("\\pgfplots@zmin", self.min[3]) ..
axisLimitToTeXString("\\pgfplots@zmax", self.max[3]) ..
"\\global\\pgfplots@threedimtrue ";
end
if plothandler.plotHasJumps then
result = result ..
"\\def\\pgfplotsaxisplothasjumps{1}"
else
result = result ..
"\\def\\pgfplotsaxisplothasjumps{0}"
end
if plothandler.filteredCoordsAway then
result = result ..
"\\def\\pgfplotsaxisfilteredcoordsaway{1}"
else
result = result ..
"\\def\\pgfplotsaxisfilteredcoordsaway{0}"
end
return result
end
-- resembles \pgfplotsaxisvisphasetransformcoordinate
function Axis:visphasetransformcoordinate(pt)
for i = 1,#pt.x do
pt.x[i] = self.datascaleTrafo[i]:map( pt.x[i] )
end
end
-- will be set by TeX code (in \begin{axis})
gca = nil
end
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