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PDF = {}
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PDF.new = function()
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local pdf = {} -- instance variable
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local page = {} -- array of page descriptors
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local object = {} -- array of object contents
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local xref_table_offset -- byte offset of xref table
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local catalog_obj -- global catalog object
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local pages_obj -- global pages object
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local procset_obj -- global procset object
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--
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-- Private functions.
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--
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local add = function(obj)
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table.insert(object, obj)
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obj.number = table.getn(object)
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return obj
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end
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local get_ref = function(obj)
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return string.format("%d 0 R", obj.number)
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end
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local write_object
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local write_direct_object
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local write_indirect_object
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write_object = function(fh, obj)
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if type(obj) == "table" and obj.datatype == "stream" then
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write_indirect_object(fh, obj)
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else
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write_direct_object(fh, obj)
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end
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end
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write_direct_object = function(fh, obj)
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if type(obj) ~= "table" then
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fh:write(obj .. "\n")
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elseif obj.datatype == "dictionary" then
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local k, v
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fh:write("<<\n")
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for k, v in pairs(obj.contents) do
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fh:write(string.format("/%s ", k))
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write_object(fh, v)
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end
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fh:write(">>\n")
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elseif obj.datatype == "array" then
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local v
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fh:write("[\n")
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for _, v in ipairs(obj.contents) do
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write_object(fh, v)
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end
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fh:write("]\n")
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elseif obj.datatype == "stream" then
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local len = 0
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if type(obj.contents) == "string" then
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len = string.len(obj.contents)
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else -- assume array
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local i, str
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for i, str in ipairs(obj.contents) do
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len = len + string.len(str) + 1
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end
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end
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fh:write(string.format("<< /Length %d >>\n", len))
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fh:write("stream\n")
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if type(obj.contents) == "string" then
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fh:write(obj.contents)
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else -- assume array
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local i, str
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for i, str in ipairs(obj.contents) do
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fh:write(str)
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fh:write("\n")
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end
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end
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fh:write("endstream\n")
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end
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end
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write_indirect_object = function(fh, obj)
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obj.offset = fh:seek()
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fh:write(string.format("%d %d obj\n", obj.number, 0))
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write_direct_object(fh, obj)
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fh:write("endobj\n")
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end
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local write_header = function(fh)
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fh:write("%PDF-1.0\n")
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end
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local write_body = function(fh)
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local i, obj
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for i, obj in ipairs(object) do
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write_indirect_object(fh, obj)
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end
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end
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local write_xref_table = function(fh)
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local i, obj
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xref_table_offset = fh:seek()
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fh:write("xref\n")
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fh:write(string.format("%d %d\n", 1, table.getn(object)))
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for i, obj in ipairs(object) do
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fh:write(
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string.format("%010d %05d n \n", obj.offset, 0)
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)
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end
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end
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local write_trailer = function(fh)
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fh:write("trailer\n")
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fh:write("<<\n")
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fh:write(string.format("/Size %d\n", table.getn(object)))
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fh:write("/Root " .. get_ref(catalog_obj) .. "\n")
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fh:write(">>\n")
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fh:write("startxref\n")
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fh:write(string.format("%d\n", xref_table_offset))
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fh:write("%%EOF\n")
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end
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--
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-- Instance methods.
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--
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pdf.new_font = function(pdf, tab)
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local subtype = tab.subtype or "Type1"
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local name = tab.name or "Helvetica"
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local font_obj = add {
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datatype = "dictionary",
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contents = {
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Type = "/Font",
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Subtype = "/" .. subtype,
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BaseFont = "/" .. name,
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}
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}
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return font_obj
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end
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pdf.new_page = function(pdf)
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local pg = {} -- instance variable
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local contents = {} -- array of operation strings
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local used_font = {} -- fonts used on this page
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--
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-- Private functions.
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--
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local use_font = function(font_obj)
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local i, f
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for i, f in ipairs(used_font) do
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if font_obj == f then
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return "/F" .. i
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end
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end
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table.insert(used_font, font_obj)
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return "/F" .. table.getn(used_font)
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end
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--
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-- Instance methods.
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--
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--
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-- Text functions.
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--
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pg.begin_text = function(pg)
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table.insert(contents, "BT")
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end
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pg.end_text = function(pg)
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table.insert(contents, "ET")
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end
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pg.set_font = function(pg, font_obj, size)
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table.insert(contents,
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string.format("%s %f Tf",
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use_font(font_obj), size)
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)
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end
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pg.set_text_pos = function(pg, x, y)
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table.insert(contents,
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string.format("%f %f Td", x, y)
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)
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end
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pg.show = function(pg, str)
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table.insert(contents,
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string.format("(%s) Tj", str)
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)
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end
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pg.set_char_spacing = function(pg, spc)
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table.insert(contents,
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string.format("%f Tc", spc)
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)
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end
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--
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-- Graphics - path drawing functions.
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--
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pg.moveto = function(pg, x, y)
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table.insert(contents,
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string.format("%f %f m", x, y)
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)
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end
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pg.lineto = function(pg, x, y)
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table.insert(contents,
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string.format("%f %f l", x, y)
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)
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end
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pg.curveto = function(pg, x1, y1, x2, y2, x3, y3)
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local str
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if x3 and y3 then
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str = string.format("%f %f %f %f %f %f c",
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x1, y1, x2, y2, x3, y3)
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else
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str = string.format("%f %f %f %f v",
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x1, y1, x2, y2)
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end
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table.insert(contents, str)
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end
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pg.rectangle = function(pg, x, y, w, h)
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table.insert(contents,
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string.format("%f %f %f %f re",
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x, y, w, h)
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)
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end
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--
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-- Graphics - colours.
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--
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pg.setgray = function(pg, which, gray)
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assert(which == "fill" or which == "stroke")
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assert(gray >= 0 and gray <= 1)
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if which == "fill" then
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table.insert(contents,
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string.format("%d g", gray)
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)
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else
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table.insert(contents,
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string.format("%d G", gray)
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)
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end
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end
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pg.setrgbcolor = function(pg, which, r, g, b)
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assert(which == "fill" or which == "stroke")
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assert(r >= 0 and r <= 1)
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assert(g >= 0 and g <= 1)
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assert(b >= 0 and b <= 1)
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if which == "fill" then
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table.insert(contents,
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string.format("%f %f %f rg", r, g, b)
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)
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else
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table.insert(contents,
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string.format("%f %f %f RG", r, g, b)
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)
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end
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end
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pg.setcmykcolor = function(pg, which, c, m, y, k)
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assert(which == "fill" or which == "stroke")
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assert(c >= 0 and c <= 1)
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assert(m >= 0 and m <= 1)
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assert(y >= 0 and y <= 1)
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assert(k >= 0 and k <= 1)
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if which == "fill" then
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table.insert(contents,
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string.format("%f %f %f %f k", c, m, y, k)
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)
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else
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table.insert(contents,
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string.format("%f %f %f %f K", c, m, y, k)
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)
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end
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end
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--
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-- Graphics - line options.
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--
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pg.setflat = function(pg, i)
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assert(i >= 0 and i <= 100)
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table.insert(contents,
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string.format("%d i", i)
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)
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end
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pg.setlinecap = function(pg, j)
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assert(j == 0 or j == 1 or j == 2)
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table.insert(contents,
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string.format("%d J", j)
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)
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end
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pg.setlinejoin = function(pg, j)
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assert(j == 0 or j == 1 or j == 2)
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table.insert(contents,
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string.format("%d j", j)
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)
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end
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pg.setlinewidth = function(pg, w)
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table.insert(contents,
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string.format("%d w", w)
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)
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end
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pg.setmiterlimit = function(pg, m)
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assert(m >= 1)
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table.insert(contents,
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string.format("%d M", m)
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)
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end
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pg.setdash = function(pg, array, phase)
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local str = ""
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local v
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for _, v in ipairs(array) do
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str = str .. v .. " "
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end
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table.insert(contents,
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string.format("[%s] %d d", str, phase)
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)
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end
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--
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-- Graphics - path-terminating functions.
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--
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pg.stroke = function(pg)
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table.insert(contents, "S")
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end
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pg.closepath = function(pg)
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table.insert(contents, "h")
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end
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pg.fill = function(pg)
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table.insert(contents, "f")
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end
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pg.newpath = function(pg)
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table.insert(contents, "n")
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end
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pg.clip = function(pg) -- no effect until next newpath
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table.insert(contents, "W")
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end
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--
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-- Graphics - state save/restore.
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--
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pg.save = function(pg)
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table.insert(contents, "q")
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end
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pg.restore = function(pg)
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table.insert(contents, "Q")
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end
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--
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-- Graphics - CTM functions.
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--
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pg.transform = function(pg, a, b, c, d, e, f) -- aka concat
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table.insert(contents,
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string.format("%f %f %f %f %f %f cm",
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a, b, c, d, e, f)
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)
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end
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pg.translate = function(pg, x, y)
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pg:transform(1, 0, 0, 1, x, y)
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end
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pg.scale = function(pg, x, y)
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if not y then y = x end
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pg:transform(x, 0, 0, y, 0, 0)
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end
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pg.rotate = function(pg, theta)
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local c, s = math.cos(theta), math.sin(theta)
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pg:transform(c, s, -1 * s, c, 0, 0)
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end
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pg.skew = function(pg, tha, thb)
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local tana, tanb = math.tan(tha), math.tan(thb)
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pg:transform(1, tana, tanb, 1, 0, 0)
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end
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pg.add = function(pg)
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418 |
local contents_obj, this_obj, resources
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419 |
local i, font_obj
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420 |
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421 |
contents_obj = add {
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422 |
datatype = "stream",
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423 |
contents = contents
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}
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resources = {
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datatype = "dictionary",
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contents = {
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Font = {
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datatype = "dictionary",
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contents = {}
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},
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ProcSet = get_ref(procset_obj)
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}
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}
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436 |
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437 |
for i, font_obj in ipairs(used_font) do
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resources.contents.Font.contents["F" .. i] =
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get_ref(font_obj)
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end
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441 |
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442 |
this_obj = add {
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datatype = "dictionary",
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contents = {
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445 |
Type = "/Page",
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446 |
Parent = get_ref(pages_obj),
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447 |
Contents = get_ref(contents_obj),
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448 |
Resources = resources
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}
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450 |
}
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451 |
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452 |
table.insert(pages_obj.contents.Kids.contents,
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get_ref(this_obj))
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454 |
pages_obj.contents.Count = pages_obj.contents.Count + 1
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455 |
end
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456 |
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457 |
table.insert(page, pg)
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|
458 |
return pg
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|
459 |
end
|
|
460 |
|
|
461 |
pdf.write = function(pdf, file)
|
|
462 |
local fh
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|
463 |
|
|
464 |
if type(file) == "string" then
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|
465 |
fh = assert(io.open(file, "w"))
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466 |
else
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|
467 |
fh = file
|
|
468 |
end
|
|
469 |
|
|
470 |
write_header(fh)
|
|
471 |
write_body(fh)
|
|
472 |
write_xref_table(fh)
|
|
473 |
write_trailer(fh)
|
|
474 |
|
|
475 |
fh:close()
|
|
476 |
end
|
|
477 |
|
|
478 |
-- initialize... add a few objects that we know will exist.
|
|
479 |
pages_obj = add {
|
|
480 |
datatype = "dictionary",
|
|
481 |
contents = {
|
|
482 |
Type = "/Pages",
|
|
483 |
Kids = {
|
|
484 |
datatype = "array",
|
|
485 |
contents = {}
|
|
486 |
},
|
|
487 |
Count = 0
|
|
488 |
}
|
|
489 |
}
|
|
490 |
|
|
491 |
catalog_obj = add {
|
|
492 |
datatype = "dictionary",
|
|
493 |
contents = {
|
|
494 |
Type = "/Catalog",
|
|
495 |
Pages = get_ref(pages_obj)
|
|
496 |
}
|
|
497 |
}
|
|
498 |
|
|
499 |
procset_obj = add {
|
|
500 |
datatype = "array",
|
|
501 |
contents = { "/PDF", "/Text" }
|
|
502 |
}
|
|
503 |
|
|
504 |
return pdf
|
|
505 |
end
|