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- {************************************************************************
- * *
- * PLOT Test Program *
- * *
- ************************************************************************}
-
- PROGRAM main;
- VAR
- x,y: ARRAY [1..20] of REAL;
- a,x1,y1,x2,y2,yf: REAL;
- i,j,n: INTEGER;
-
- {$I GRAF1.PAS}
- {$I GRAF2.PAS}
-
- BEGIN
- grinit ('test.vec ');
-
- { Plot Polygon }
- n := 20;
-
- FOR i := 1 to n DO BEGIN { set up corner coord. }
- a := 6.28318 * i / n;
- x[i] := cos(a)*0.49 + 0.5;
- y[i] := sin(a)*0.49 + 0.5;
- END;
-
- Writeln(CON, 'Plotting ',n,' sided polygon');
-
- FOR i := 1 to n DO BEGIN { connect corners }
- FOR j := i+1 to n DO segmnt( x[i],y[i], x[j],y[j] );
- END;
-
- gprint; { advance to new frame }
- color(0);
- erase;
- color(127);
-
- writecmd('T',1); {use Text cmd to advance page}
- FOR I := 1 TO 18 DO writecmd( Chr(10),1 );
- writecmd( Chr(0),1 );
-
- { Plot Sine Curve Graph }
-
- Writeln(CON, 'Plotting sine curve figure');
-
- Writeln(CON, ' Drawing axes and grid');
- chset( 0.0292, 0.0279, 0.0 );
- graph( 0.0,10.0,5, -1.0,1.0,6, 0.15,0.85,0.1,0.9 );
-
- Writeln(CON, ' Drawing outline curve');
- point ( sx(0.0), sy(0.0) );
-
- a := 0.2;
- WHILE a<=10.0 DO BEGIN { draw outline }
- x1 := a;
- y1 := exp( -a/5.0 ) * sin(a);
-
- vector( sx(x1), sy(y1) );
- a := a + 0.2
- END;
-
- Writeln(CON, ' Filling area under curve');
- yf := sy(0.0);
- x1 := sx(0.0);
- y1 := sy(0.0);
-
- color(96);
-
- a := 0.2;
- WHILE a<=10.0 DO BEGIN { fill in outline }
- x2 := sx(a);
- y2 := sy( exp( -a/5.0 ) * sin(a) );
- fill ( x1,y1, x2,y2, yf);
- x1 := x2;
- y1 := y2;
- a := a + 0.2
- END;
-
- Writeln(CON, ' Printing title');
- gstrng( 0.425, 0.95,'Sine Curve Test Plot');
-
- Writeln(CON, 'Finished Plotting');
- grfini;
- END.