| 1 | PROGRAM PLOTTERTEST(OUTPUT); |
| 2 | |
| 3 | CONST UP="H"; DOWN="I"; |
| 4 | C=100.0; P=0.125; RHO=0.0174532925; |
| 5 | X0=950.0; Y0=1300.0; |
| 6 | |
| 7 | VAR X,Y,R,PHI: REAL; |
| 8 | GRAD: INTEGER; |
| 9 | |
| 10 | PENXPOS,PENYPOS: INTEGER; |
| 11 | |
| 12 | (********** P L O T T E R PROZEDUREN **********) |
| 13 | |
| 14 | PROCEDURE PEN(I:CHAR); |
| 15 | BEGIN WRITE(I) END; |
| 16 | |
| 17 | PROCEDURE SEND(IX,IY: INTEGER); |
| 18 | BEGIN |
| 19 | IF IX>=0 THEN WRITE( IX:1,"@") |
| 20 | ELSE WRITE(-IX:1,"P"); |
| 21 | IF IY>=0 THEN WRITE( IY:1,"A") |
| 22 | ELSE WRITE(-IY:1,"Q") |
| 23 | END; |
| 24 | |
| 25 | PROCEDURE MOVE(X,Y: REAL); |
| 26 | BEGIN |
| 27 | PENXPOS:=ROUND(X); PENYPOS:=ROUND(Y); |
| 28 | WRITE("H"); |
| 29 | SEND(PENXPOS,PENYPOS); |
| 30 | WRITELN("K") |
| 31 | END; |
| 32 | |
| 33 | PROCEDURE LINE(X,Y: REAL); |
| 34 | VAR DX,DY: INTEGER; |
| 35 | BEGIN |
| 36 | DX:=ROUND(X)-PENXPOS; |
| 37 | DY:=ROUND(Y)-PENYPOS; |
| 38 | SEND(DX,DY); WRITELN("J"); |
| 39 | PENXPOS:=PENXPOS+DX; PENYPOS:=PENYPOS+DY |
| 40 | END; |
| 41 | |
| 42 | PROCEDURE SYSIZE(R,G: INTEGER); |
| 43 | BEGIN |
| 44 | WRITE("C", CHR(G+16*(R+2))) |
| 45 | END; |
| 46 | |
| 47 | (***********************************************) |
| 48 | |
| 49 | BEGIN |
| 50 | MOVE(200,2600); |
| 51 | SYSIZE(0,6); |
| 52 | WRITELN("BPLOTTER-PROGRAMMIERUNG IN PASCAL-S"); |
| 53 | MOVE(X0,Y0); |
| 54 | PEN(DOWN); |
| 55 | MOVE(X0+C,Y0); |
| 56 | PEN(DOWN); |
| 57 | FOR GRAD := 1 TO 180 DO |
| 58 | BEGIN |
| 59 | PHI := 5*GRAD*RHO; |
| 60 | R := C*EXP(P*PHI); |
| 61 | X := R*COS(PHI); |
| 62 | Y := R*SIN(PHI); |
| 63 | LINE(X0+X,Y0+Y) |
| 64 | END; |
| 65 | PEN(UP) |
| 66 | END. |