Examples utility unit

The examples in this section make use of the unit vidutil, which contains the TextOut function. This function writes a text to the screen at a given location. It looks as follows:

Example

unit vidutil;

Interface

uses
  video;

Procedure TextOut(X,Y : Word;Const S : String);

Implementation

Procedure TextOut(X,Y : Word;Const S : String);

Var
  W,P,I,M : Word;

begin
  P:=((X-1)+(Y-1)*ScreenWidth);
  M:=Length(S);
  If P+M>ScreenWidth*ScreenHeight then
    M:=ScreenWidth*ScreenHeight-P;
  For I:=1 to M do
    VideoBuf^[P+I-1]:=Ord(S[i])+($07 shl 8);
end;

end.