NULL mag Issue 09 28 Plasma demo textmod

eZine lover (@eZine)

Published in 

null magazine

 · 26 Dec 2020

another demo for text mode... this time a plasma effect... not very good. at least not so amazing like the fire effect one.. but still counts :)

program plasma; 

uses fastcrt; 

const 

  width = 80; 

Var 
    XAnswer,YAnswer, 
    ToAdd, 

    X,Y                 : Integer; 
    SinArray            : Array [0..width] Of Integer; 

Function Rad(Angle      : Real): Real; 
Begin 
  Rad := Angle*PI/180; 
End; 
Begin 
{set 80x50 mode to have a better resolution ;) } 

asm 
  mov     ax, 1112h 
  xor     bl, bl 
  int     10h 

end; 

{Now to create our sine array} 
  For X := 0 to width Do 
    Begin 
        SinArray[X] := Trunc(Sin(Rad(X))*1024); 
    End; 
  ToAdd := 0; 

  While Not Keypressed Do 

  Begin 

    wait_retrace; 

    ToAdd := ToAdd + 1; 

{Here we add our small amount to our dynamic variable} 

    For  X := 0 to 80 Do 
    Begin 
      XAnswer := 20 * SinArray[((X * 4  ) + (ToAdd      )) Mod width]+ 

                 30 * SinArray[((X      ) + (ToAdd * 4  )) Mod width]+ 

                 50 * SinArray[((X Div 4) + (ToAdd Div 4)) Mod width]; 

{This is our first answer for our X coordinate of the square} 
      For Y := 0 to 50 Do 

      Begin 

          YAnswer := 40 * SinArray[((Y * 6  ) + (ToAdd      )) Mod width]+ 
                     40 * SinArray[((Y      ) + (ToAdd * 6  )) Mod width]+ 
                     20 * SinArray[((Y      ) + (ToAdd Div 6)) Mod width]; 
{This is our second answer for our Y coordinate of the square} 

{This function writes the "pixel" on the screen. You can use any funtion} 

{you want to display a char on the screen} 

          fastout(x,y,chr(219),(XAnswer+YAnswer) Shr 10); 
      End; 

    End; 
  End; 

  {back to 80x25 mode} 
  xsetmode(3); 
End.