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- Font = class()
- -- - The Hershey Fonts were originally created by Dr.
- -- A. V. Hershey while working at the
- -- U. S. National Bureau of Standards.
- -- Useful Links:
- -- http://emergent.unpythonic.net/software/hershey
- -- http://paulbourke.net/dataformats/hershey/
- -- Re-encoding of font information and other shenanigans
- -- by Tom Bortels bortels@gmail.com November 2011
- -- all rights reversed (Hail Eris!)
- -- "If I have seen a little further it is by standing
- -- on the shoulders of Giants."
- -- Isaac Newton
- function Font:init()
- -- font data - 2 decimal character # of points,
- -- followed by 2*points of point data
- -- 9->-9, 8-<-8, ... 1->-1, 0->0, A->1, B->2, ... Z->26
- self.code = "9876543210ABCDEFGHIJKLMNOPQRSTUVWXYZ"
- -- this is the Hershey Roman Simplex font for ascii 32-127
- self.fontdata =
- "00160810EUEG11EBDAE0FAEB0516DUDN11LULN1121KYD711QYJ711DLRL11"
- .. "CFQF2620HYH411LYL411QROTLUHUETCRCPDNEMGLMJOIPHQFQCOAL0H0EACC"
- .. "3124UUC011HUJSJQIOGNENCPCRDTFUHUJTMSPSSTUU11QGOFNDNBP0R0TAUC"
- .. "UESGQG3426WLWMVNUNTMSKQFOCMAK0G0EADBCDCFDHEILMMNNPNRMTKUITHR"
- .. "HPIMKJPCRAT0V0WAWB0710ESDTEUFTFREPDO1014KYIWGTEPDKDGEBG2I5K7"
- .. "1014CYEWGTIPJKJGIBG2E5C70816HUHI11CRML11MRCL0526MRM011DIVI08"
- .. "10FAE0DAEBFAF1E3D40226DIVI0510EBDAE0FAEB0222TYB71720IUFTDQCL"
- .. "CIDDFAI0K0NAPDQIQLPQNTKUIU0420FQHRKUK01420DPDQESFTHULUNTOSPQ"
- .. "POOMMJC0Q01520EUPUJMMMOLPKQHQFPCNAK0H0EADBCD0620MUCGRG11MUM0"
- .. "1720OUEUDLEMHNKNNMPKQHQFPCNAK0H0EADBCD2320PROTLUJUGTEQDLDGEC"
- .. "GAJ0K0NAPCQFQGPJNLKMJMGLEJDG0520QUG011CUQU2920HUETDRDPENGMKL"
- .. "NKPIQGQDPBOAL0H0EADBCDCGDIFKILMMONPPPROTLUHU2320PNOKMIJHIHFI"
- .. "DKCNCODRFTIUJUMTORPNPIODMAJ0H0EADC1110ENDMELFMEN11EBDAE0FAEB"
- .. "1410ENDMELFMEN11FAE0DAEBFAF1E3D40324TRDIT00526DLVL11DFVF0324"
- .. "DRTID02018CPCQDSETGUKUMTNSOQOONMMLIJIG11IBHAI0JAIB5527RMQOOP"
- .. "LPJOINHKHHIFKENEPFQH11LPJNIKIHJFKE11RPQHQFSEUEWGXJXLWOVQTSRT"
- .. "OULUITGSEQDOCLCIDFEDGBIAL0O0RATBUC11SPRHRFSE0818IUA011IUQ011"
- .. "DGNG2321DUD011DUMUPTQSRQROQMPLMK11DKMKPJQIRGRDQBPAM0D01821RP"
- .. "QROTMUIUGTERDPCMCHDEECGAI0M0OAQCRE1521DUD011DUKUNTPRQPRMRHQE"
- .. "PCNAK0D01119DUD011DUQU11DKLK11D0Q00818DUD011DUQU11DKLK2221RP"
- .. "QROTMUIUGTERDPCMCHDEECGAI0M0OAQCRERH11MHRH0822DUD011RUR011DK"
- .. "RK0208DUD01016LULEKBJAH0F0DACBBEBG0821DUD011RUDG11ILR00517DU"
- .. "D011D0P01124DUD011DUL011TUL011TUT00822DUD011DUR011RUR02122IU"
- .. "GTERDPCMCHDEECGAI0M0OAQCRESHSMRPQROTMUIU1321DUD011DUMUPTQSRQ"
- .. "RNQLPKMJDJ2422IUGTERDPCMCHDEECGAI0M0OAQCRESHSMRPQROTMUIU11LD"
- .. "R21621DUD011DUMUPTQSRQROQMPLMKDK11KKR02020QROTLUHUETCRCPDNEM"
- .. "GLMJOIPHQFQCOAL0H0EACC0516HUH011AUOU1022DUDFECGAJ0L0OAQCRFRU"
- .. "0518AUI011QUI01124BUG011LUG011LUQ011VUQ00520CUQ011QUC00618AU"
- .. "IKI011QUIK0820QUC011CUQU11C0Q01114DYD711EYE711DYKY11D7K70214"
- .. "0UN31114IYI711JYJ711CYJY11C7J71016FOHRJO11CLHQML11HQH0021602"
- .. "P20710FUETDRDPEOFPEQ1719ONO011OKMMKNHNFMDKCHCFDCFAH0K0MAOC17"
- .. "19DUD011DKFMHNKNMMOKPHPFOCMAK0H0FADC1418OKMMKNHNFMDKCHCFDCFA"
- .. "H0K0MAOC1719OUO011OKMMKNHNFMDKCHCFDCFAH0K0MAOC1718CHOHOJNLMM"
- .. "KNHNFMDKCHCFDCFAH0K0MAOC0812JUHUFTEQE011BNIN2219ONO2N5M6K7H7"
- .. "F611OKMMKNHNFMDKCHCFDCFAH0K0MAOC1019DUD011DJGMINLNNMOJO00808"
- .. "CUDTEUDVCU11DND01110EUFTGUFVEU11FNF3E6C7A70817DUD011NNDD11HH"
- .. "O00208DUD01830DND011DJGMINLNNMOJO011OJRMTNWNYMZJZ01019DND011"
- .. "DJGMINLNNMOJO01719HNFMDKCHCFDCFAH0K0MAOCPFPHOKMMKNHN1719DND7"
- .. "11DKFMHNKNMMOKPHPFOCMAK0H0FADC1719ONO711OKMMKNHNFMDKCHCFDCFA"
- .. "H0K0MAOC0813DND011DHEKGMINLN1717NKMMJNGNDMCKDIFHKGMFNDNCMAJ0"
- .. "G0DACC0812EUEDFAH0J011BNIN1019DNDDEAG0J0LAOD11ONO00516BNH011"
- .. "NNH01122CNG011KNG011KNO011SNO00517CNN011NNC00916BNH011NNH0F4"
- .. "D6B7A70817NNC011CNNN11C0N03914IYGXFWEUESFQGPHNHLFJ11GXFVFTGR"
- .. "HQIOIMHKDIHGIEICHAG0F2F4G611FHHFHDGBFAE1E3F5G6I70208DYD73914"
- .. "EYGXHWIUISHQGPFNFLHJ11GXHVHTGRFQEOEMFKJIFGEEECFAG0H2H4G611HH"
- .. "FFFDGBHAI1I3H5G6E72324CFCHDKFLHLJKNHPGRGTHUJ11CHDJFKHKJJNGPF"
- .. "RFTGUJUL"
- local i=1
- local c=32
- self.font = {}
- while (i < string.len(self.fontdata)) do
- local cs = string.char(c)
- self.font[cs] = {}
- local points = string.sub(self.fontdata, i, i+1)
- self.font[cs].points = points
- self.font[cs].char = cs
- self.font[cs].ascii = c
- self.font[cs].width = string.sub(self.fontdata, i+2, i+3)
- i = i + 4
- self.font[cs].data = string.sub(self.fontdata, i, i+points*2)
- i = i + points*2
- c = c + 1
- end
- i=-9
- self.decode = {}
- for c in self.code:gmatch"." do
- self.decode[c]=i
- i=i+1
- end
- end
- -- returns width in pixels of unscaled, strokeWidth(1) string
- function Font:stringwidth(s)
- local x, l, i = 0, string.len(s)
- for i = 1, l do
- x = x + self.font[s:sub(i, i)].width
- end
- return x
- end
- -- draw a string at x,y (skipping offscreen draws)
- function Font:drawstring(s, x, y)
- local l, i
- l = string.len(s)
- for i = 1, l do
- local c = s:sub(i, i)
- local w = self.font[c].width
- if ((x + w) >= 0) then
- x = x + (self:drawchar(c, x, y))
- else
- x = x + w -- skip offscreen left (but track position)
- end
- if (x > WIDTH) then break end -- skip offscreen right
- end
- end
- -- optimized draw string at x,y (old version for reference)
- function Font:olddrawstring(s, x, y)
- local l, i
- l = string.len(s)
- for i = 1, l do
- x = x + (self:drawchar(string.sub(s, i, i), x, y))
- end
- end
- function Font:drawchar(c, x, y)
- local ax, ay, bx, by, minx, maxx = -1, -1, -1, -1, -1, -1
- local p, plot
- local ch = self.font[c]
- for p=1, ch.points do
- ax=bx
- ay=by
- bx=self.decode[ch.data:sub(p*2-1, p*2-1)]
- by=self.decode[ch.data:sub(p*2, p*2)]
- plot=true
- if ((ax==-1) and (ay==-1)) then plot=false end
- if ((bx==-1) and (by==-1)) then plot=false end
- if (plot) then
- line(x+ax, y+ay, x+bx, y+by)
- end
- end
- return ch.width -- for drawstring
- end
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