Output of file : IPLOT.SP contained in archive : SPL.ZIP
BEGIN

COMMENT
This program will plot a set of points in three
dimensions using the high resolution graphics. ;

REAL extent,vx,vy,topx,topy;
REAL ARRAY x(500),y(500),z(500);
INTEGER limit,i;

PROCEDURE Plotter;
BEGIN
COMMENT This procedure scales and plots the points on
the computer screen. ;

INTEGER i;
REAL maxx,maxy,minx,miny,difx,dify;

maxx := -1*10^30; maxy := maxx; minx := 1*10^30; miny := minx;
topx := 639; topy := 200;

FOR i := 1 STEP 1 UNTIL limit DO
BEGIN
IF x(i) >= maxx THEN maxx := x(i);
IF x(i) <= minx THEN minx := x(i);
IF y(i) >= maxy THEN maxy := y(i);
IF y(i) <= miny THEN miny := y(i);
END

COMMENT The maximum and minimum x and y values are computed. ;

difx := maxx-minx; dify := maxy-miny;

FOR i := 1 STEP 1 UNTIL limit DO
BEGIN
x(i) := ((x(i)-minx)/difx)*topx;
y(i) := ((y(i)-miny)/dify)*topy;
PSET(x(i),topy-y(i)),7;
END

END

PROCEDURE Convert_3D_to_2D;
BEGIN

COMMENT This procedure converts 3 dimensional coordinates to
2 dimensional coordinates. ;

REAL cosine_45,sine_45;
INTEGER i;

cosine_45 := COS((45.*3.14159)/180.);
sine_45 := SIN((45.*3.14159)/180.);

FOR i := 1 STEP 1 UNTIL limit DO
BEGIN
x(i) := x(i) + (extent-y(i))*cosine_45;
y(i) := z(i) + (extent-y(i))*sine_45;
END

END

COMMENT This is the start of the main program. ;

HOME; SCREEN 2;

Start_plot:

INPUT('Enter the scale factor:' @ extent); HOME;

OUTPUT('.... WAIT ....');

IF extent < 0 THEN GO Finish;
i:=1;
FOR vx := -1. STEP .1 UNTIL 1. DO
BEGIN
FOR vy := -1. STEP .1 UNTIL 1. DO
BEGIN
x(i) := vx; y(i) := vy; z(i) := SQR(2.-vx^2-vy^2); i := i+1;
END
END

COMMENT Points have been computed,now set up axes. ;

x(i+1) := extent; y(i+1) := 0; z(i+1) := 0;
x(i+2) := -extent; y(i+2) := 0; z(i+2) := 0;
x(i+3) := 0; y(i+3) := extent; z(i+3) := 0;
x(i+4) := 0; y(i+4) := -extent; z(i+4) := 0;
x(i+5) := 0; y(i+5) := 0; z(i+5) := extent;
x(i) := 0; y(i) := 0; z(i) := -extent;
limit := i+5;

Convert_3D_to_2D;

HOME;

Plotter;

OUTPUT( DATE\$ + ' ' + TIME\$ );

LINE (x(i+1),topy-y(i+1)) - (x(i+2),topy-y(i+2)),7;
LINE (x(i+3),topy-y(i+3)) - (x(i+4),topy-y(i+4)),7;
LINE (x(i),topy-y(i)) - (x(i+5),topy-y(i+5)),7;

Busy: IF INKEY\$ = '' THEN GO TO Busy;
ELSE GO TO Start_plot;

Finish:
END


### 3 Responses to “Category : Miscellaneous Language Source CodeArchive   : SPL.ZIPFilename : IPLOT.SP”

1. Very nice! Thank you for this wonderful archive. I wonder why I found it only now. Long live the BBS file archives!

2. This is so awesome! 😀 I’d be cool if you could download an entire archive of this at once, though.

3. But one thing that puzzles me is the “mtswslnkmcjklsdlsbdmMICROSOFT” string. There is an article about it here. It is definitely worth a read: http://www.os2museum.com/wp/mtswslnk/