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0039_Printing Epson Graphics.pas
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Pascal/Delphi Source File
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1994-11-30
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4KB
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117 lines
{
From: randyd@alpha2.csd.uwm.edu (Randall Elton Ding)
>Does anyone have any code that shows how one might print some graphics
>on a 9 or 24-pin Epson compatible dot-matrix printer? I'm specifically
I pulled this out of my graphstuff unit which I made years ago. It
was designed for my epson mx100 (thats mx not fx) printer... early 80's.
The mx printer has 9 pins and only 8 are used for graphics.
Hopefully the escape codes are the same for your newer epson.
}
program foo;
uses graph;
const
rotate90 = true;
widepaper = false;
procedure developgraph(rotate: boolean);
{ if passed parameter is true, the graphics
image will be rotated 90 degrees to fit on
a narrow sheet of printer paper, if false
the image will completely fill the wide
paper erect and double height }
const maxprinter = 816; { maximum pixel width of printer }
var
graphwidth,graphheight,printerwidth,printerheight: integer;
n1,n2,sx,sy,x,y,y2,pixcolr: integer;
widthratio,heightratio: real;
blank: boolean;
bitloc,bits: byte;
bytes: array [1..maxprinter] of byte;
lst: text;
begin
assign(lst,'lpt1');
rewrite(lst);
case rotate of
widepaper: begin { develop erect on wide paper }
graphwidth:= getmaxx+1;
graphheight:= getmaxy+1;
printerwidth:= maxprinter; { scale 1.275 x 2 }
printerheight:= graphheight*2;
end;
rotate90: begin { if rotate then reverse x and y }
graphwidth:= getmaxy+1;
graphheight:= getmaxx+1;
printerwidth:= graphwidth; { scale 1 x 1 }
printerheight:= graphheight;
end;
end;
n2:= printerwidth div 256;
n1:= printerwidth mod 256;
write (lst,chr(27),'A',chr(8)); { set line spacing to 8 }
widthratio:= printerwidth/graphwidth;
heightratio:= printerheight/graphheight;
y:= 0;
while y < printerheight do begin
blank:= true; { remains true if entire printer pass is blank }
for x:= 1 to printerwidth do begin
sx:= trunc ((x-1)/widthratio); { screen x coorid }
bits:= 0;
bitloc:= $80;
for y2:= y to y+7 do begin
sy:= trunc(y2/heightratio); { screen y coorid }
if sy < graphheight then begin { last printer pass is incomplete }
case rotate of
widepaper: pixcolr:= getpixel (sx,sy);
rotate90: pixcolr:= getpixel (sy,sx); { x and y swaped }
end;
if pixcolr > 0 then bits:= bits or bitloc;
end;
bitloc:= bitloc shr 1;
end;
case rotate of
widepaper: bytes [x]:= bits;
rotate90: bytes [printerwidth-x+1]:= bits; { reverse image }
end;
if bits > 0 then blank:= false; { have something to print this pass }
end;
if not blank then begin { line feed if nothing to print this pass }
write (lst,chr(27),'K',chr(n1),chr(n2)); { set printer graph mode }
for x:= 1 to printerwidth do write (lst,chr(bytes[x]));
end;
writeln (lst); { output 8 printer pixels high per pass }
y:= y+8;
end;
write (lst,chr(12)); { top of form }
write (lst,chr(27),'@'); { re-initalize printer }
close(lst);
end;
Var
gd, gm,
Count : Integer;
begin
{ Demo By Kerry Sokalsky - SWAG Support Team }
Gd := Detect;
InitGraph(gd, gm, 'e:\bp\bgi');
For Count := 1 to 100 do
Circle(Random(500) + 50, Random(380) + 50, Random(50));
Readln;
DevelopGraph(False);
Readln;
end.