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-- ps.lua
-- lua interface to postscript
-- Luiz Henrique de Figueiredo (lhf@csg.uwaterloo.ca)
-- 14 May 96
PS={}
function P(x)
write(x.."\n")
end
-------------------------------------------------------------------- control --
function PS.open(title)
if title==nil then title="(no title)" end
P("%!PS-Adobe-2.0 EPSF-1.2")
P("%%Title: "..title)
P("%%Creator: ps.lua from Lua 2.4")
P("%%CreationDate: "..date())
P("%%Pages: (atend)")
P("%%BoundingBox: (atend)")
P("%%EndComments")
P("%%BeginProcSet: ps.lua")
P("/s { stroke } bind def")
P("/f { fill } bind def")
P("/m { moveto } bind def")
P("/l { lineto } bind def")
P("/L { moveto lineto stroke } bind def")
P("/t { show } bind def")
P("/o { 0 360 arc stroke } bind def")
P("/O { 0 360 arc fill } bind def")
P("/p { 3 0 360 arc fil } bind def")
P("/F { findfont exch scalefont setfont } bind def")
P("/LS { 0 setdash } bind def")
P("/LW { setlinewidth } bind def")
P("%%EndProcSet: ps.lua")
P("%%EndProlog")
P("%%BeginSetup")
P("0 setlinewidth")
P("1 setlinejoin")
P("1 setlinecap")
P("10 /Times-Roman F")
P("%%EndSetup\n")
P("%%Page: 1 1")
-- cxmin=dv.xmin; cxmax=dv.xmax; cymin=dv.ymin; cymax=dv.ymax
xmin=1000; xmax=-1000; ymin=1000; ymax=-1000
page=1
end
function PS.close()
P("stroke")
P("showpage")
P("%%Trailer")
P("%%Pages: "..page)
P("%%BoundingBox: "..xmin.." "..ymin.." "..xmax.." "..ymax)
P("%%EOF")
end
function PS.clear()
if (empty) then return end
page=page+1
P("showpage")
P("%%Page: "..page.." "..page)
empty=1
end
function PS.comment(s)
P("% "..s)
end
--------------------------------------------------------------- direct color --
function PS.rgbcolor(r,g,b)
P(r.." "..g.." "..b.." setrgbcolor")
end
function PS.gray(g)
P(g.." setgray")
end
---------------------------------------------------------------- named color --
function PS.color(c)
P("C"..c)
end
function PS.defrgbcolor(c,r,g,b)
P("/C"..c.." { "..r.." "..g.." "..b.." setrgbcolor } def")
end
function PS.defgraycolor(c,g)
P("/C"..c.." { "..g.." setgray } def")
end
----------------------------------------------------------------------- line --
function PS.line(x1,y1,x2,y2)
P(x2.." "..y2.." "..x1.." "..y1.." L")
PS.update(x1,y1)
PS.update(x2,y2)
end
function PS.moveto(x,y)
P(x.." "..y.." m")
PS.update(x,y)
end
function PS.lineto(x,y)
P(x.." "..y.." l")
PS.update(x,y)
end
function PS.linewidth(w)
P(w.." LW")
end
function PS.linestyle(s)
P("["..s.."] LS")
end
----------------------------------------------------------------------- text --
function PS.font(name,size)
if (size==nil) then size=10 end
P(size.." /"..name.." F")
end
function PS.text(x,y,s)
P(x.." "..y.."m ("..s..") t")
PS.update(x,y)
end
--------------------------------------------------------------------- circle --
function PS.circle(x,y,r)
P(x.." "..y.." "..r.." o")
PS.update(x-r,y-r)
PS.update(x+r,y+r)
end
function PS.disk(x,y,r)
P(x.." "..y.." "..r.." O")
PS.update(x-r,y-r)
PS.update(x+r,y+r)
end
function PS.dot(x,y)
P(x.." "..y.." p")
PS.update(x-r,y-r)
PS.update(x+r,y+r)
end
------------------------------------------------------------------------ box --
function PS.rectangle(xmin,xmax,ymin,ymax)
P(xmin.." "..ymin.." m "..
xmax.." "..ymin.." l "..
xmax.." "..ymax.." l "..
xmin.." "..ymax.." l s")
PS.update(xmin,ymin)
PS.update(xmax,ymax)
end
function PS.box(xmin,xmax,ymin,ymax)
P(xmin.." "..ymin.." m "..
xmax.." "..ymin.." l "..
xmax.." "..ymax.." l "..
xmin.." "..ymax.." l f")
PS.update(xmin,ymin)
PS.update(xmax,ymax)
end
-------------------------------------------------------- update bounding box --
function PS.update(x,y)
-- if (x>=cxmin and x<=cxmax and y>=cxmin and y<=cxmax) then
if (x<xmin) then xmin=x elseif (x>xmax) then xmax=x end
if (y<ymin) then ymin=y elseif (y>ymax) then ymax=y end
empty=0
-- end
end
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