tp draw

I compile an old Turbo Pascal (1987) program with

errors : illegal identifier DRAW.
=======================

What is the correct one ,

for NEW TURBO PASCAL (7.0 , FREE PASCAL) ? Thank you.

---------------------------------------------------------


procedure DrawDistribution ; {draws the distribution of weight vectors:
linear array}
const
cl = 200 ; { white ; }
xw = 320 ;
yw = 160 ;
var
x, y, xo, yo : integer ;

procedure DrawLine (i : integer) ;
begin {draw A line connecting two weight vectors}
xo := X ;
X := round ((xw div 2) * (m[i,0] + m[i+1,0])) ;
yo := Y ;
Y := round ((yw div 2) * (m[i,1] + m[i+1,1])) ;
draw (xo, yo, x, y, cl) ;
draw (x-1, y-1, x+1, y-1, cl) ;
draw (x-1, y, x+1, y, cl) ;
draw (x-1, y+1, x+1, y+1, cl) ;
end ; {DrawLine}

begin {DrawDistribution}
hires ;
{ graphbackground (black) ; }
case DensityFunction of {draw the corresponding frame}
Square : begin
draw (159, 19, 481, 19, cl) ;
draw (481, 19, 481, 181, cl) ;
draw (481, 181, 159, 181, cl) ;
draw (159, 181, 159, 19, cl) ;
end ;
triangle : begin
draw (159, 181, 481, 181, cl) ;
...............................

Comments

  • : I compile an old Turbo Pascal (1987) program with
    :
    : errors : illegal identifier DRAW.
    : =======================
    :
    : What is the correct one ,
    :
    : for NEW TURBO PASCAL (7.0 , FREE PASCAL) ? Thank you.
    :
    : ---------------------------------------------------------
    :
    :
    : procedure DrawDistribution ; {draws the distribution of weight vectors:
    : linear array}
    : const
    : cl = 200 ; { white ; }
    : xw = 320 ;
    : yw = 160 ;
    : var
    : x, y, xo, yo : integer ;
    :
    : procedure DrawLine (i : integer) ;
    : begin {draw A line connecting two weight vectors}
    : xo := X ;
    : X := round ((xw div 2) * (m[i,0] + m[i+1,0])) ;
    : yo := Y ;
    : Y := round ((yw div 2) * (m[i,1] + m[i+1,1])) ;
    : draw (xo, yo, x, y, cl) ;
    : draw (x-1, y-1, x+1, y-1, cl) ;
    : draw (x-1, y, x+1, y, cl) ;
    : draw (x-1, y+1, x+1, y+1, cl) ;
    : end ; {DrawLine}
    :
    : begin {DrawDistribution}
    : hires ;
    : { graphbackground (black) ; }
    : case DensityFunction of {draw the corresponding frame}
    : Square : begin
    : draw (159, 19, 481, 19, cl) ;
    : draw (481, 19, 481, 181, cl) ;
    : draw (481, 181, 159, 181, cl) ;
    : draw (159, 181, 159, 19, cl) ;
    : end ;
    : triangle : begin
    : draw (159, 181, 481, 181, cl) ;
    : ...............................
    :
    It looks like Draw() is a user-defined procedure, which calls MoveTo() and LineTo() to draw a line. It isn't so hard to code it again. Other than that, it should run on both versions of Pascal.
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