NULL mag Issue 09 18 Simple animator

Published in

· 26 Dec 2020

this script is used to make simple animations with ascii/ansi chars. it will display a sequence of characters, to form an animation and it will also, replace the background chars, that may be overwritten. this way, the

animation will not interfere with the background image.

uses cfg; 
procedure anim(str:string); 
type 
  tchar = record 
    x : byte; 
    y : byte; 
    a : byte; 
    c : char; 
  end; 
var 
  buf : array[1..10] of tchar 
  i,d:integer; 
  s:string; 
  tmp:string; 
  wait:integer; 
  sx,sy:string; 
  sa:byte; 
  ch:char; 
  procedure clearbuf; 
  var a:byte; 
  begin 
    for a:=1 to 10 do begin 
      buf[a].x:=0; 
      buf[a].y:=0; 
      buf[a].a:=0; 
      buf[a].c:=' '; 
    end; 
  end; 

  procedure restorebuf; 
  var a:byte; 
  begin 
    for a := 1 to 10 do 
      if buf[a].x<>0 then writexy(buf[a].x,buf[a].y,buf[a].a,buf[a].c); 
  end; 

begin 
  s := str; 
  if s[length(s)]<>';' then s:=s+';'; 
  while length(s)>0 do begin 
    d := pos(';',s); 
    if d>0 then begin 
      tmp:=copy(s,1,d-1); 
      delete(s,1,d); 
    end else begin 
      tmp:=s; 
    end; 
    wait := str2int(copy(tmp,length(tmp)-2,3)); 
    delete(tmp,length(tmp)-2,3); 
    i:=1; 
    clearbuf; 
    while length(tmp)>0 and i<11 do begin 
      buf[i].x:=str2int(copy(tmp,1,2)); 
      buf[i].y:=str2int(copy(tmp,3,2)); 
      buf[i].a:=GetAttrXY(buf[i].x,buf[i].y); 
      buf[i].c:=GetCharXY(buf[i].x,buf[i].y); 
      if buf[i].c=#0 then buf[i].c:=' '; 
      sa := str2int(copy(tmp,5,3)); 
      ch := copy(tmp,8,1); 
      delete(tmp,1,8); 
      writexy(buf[i].x,buf[i].y,sa,ch); 
      i:=i+1; 
    end; 
    delay(wait); 
    restorebuf; 
  end; 
end; 

// frame field 
// xxyyattc 
// xx  : two digit x position (ex. 03,10,70) 
// yy  : two digit y position (ex. 01,03,10,24) 
// att : three digit color attribute. calculate like this: att = fg + (bg * 16) 
//       yellow on blue background is att = 14 + (1 * 16) = 31, so att = 031 
//       black on gray background is  att = 0  + (7 * 16) = 112, so att = 112 
// c   : the character to display 

begin 
  dispfile('logoff'); 
  anim('1010014!500;1013014!510;1019014!510;1021014@510;'); 
  anim('0921014`1021014#1121014\510;0921014.1021014:1121014,300'); 
  anim('1010003.300;1010003o300;1010003O300'); 
  anim('4015003.300;4015003o300;4015003O300'); 
  anim('7005003.300;7005003o300;7005003O300'); 

  gotoxy(1,24); 
  write('|PN'); 

end.

each frame is separated with the symbol ; you can have up to 10 frame fields in the same frame. each frame is drawn immediately. at the end of each frame you must enter a time delay in milliseconds from 000 to 999. if you don't want to delay the display just enter 000.

each frame field is 8 chars wide. if you do a mistake, the script may even crash. see frame field explanation above.

using the anim function, you can even make a script to use it as an oneliner to display animations inside menus.