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CD ROM Paradise Collection 4 1995 Nov.iso
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SCREEN.SWG
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0033_Screen I-O Routines.pas
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Pascal/Delphi Source File
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1993-10-28
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3KB
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101 lines
{***********************************************************************}
PROGRAM ScreenPortDemo; { Sept 6/93, Greg Estabrooks. }
USES CRT; { LastMode,Clrscr. }
CONST
Speed = 50; { Define speed for moving screen portion}
{******** Change this to make the screen move faster/slower *******}
TYPE
ScreenPort = RECORD
ScreenSt :ARRAY[1..4000] OF BYTE;
NumCols,
NumRows :BYTE;
END;
ScreenPtr = ^ScreenSet;
ScreenSet = ARRAY[1..50,1..80,0..1] OF BYTE;
{ 1..50 = Row, 0..79 = Col, 0 = Character,
1 = Color Byte }
VAR
TextScreen :SCREENPTR;
BaseOfScreen :WORD;
BPort,
SPort :ScreenPort;
Row,Colm :WORD;
PROCEDURE SaveScrPort( Col1, Row1, Col2, Row2 :BYTE; VAR ScrP :SCREENPORT );
VAR
LLength :BYTE;
Counter1,Counter2 :WORD;
BEGIN
Counter2 := 1;
LLength := (2 * (Col2 - Col1))+2;
For Counter1 := Row1 To Row2 DO
BEGIN
Move(TextScreen^[Counter1,Col1,0],ScrP.ScreenST[Counter2],LLength);
Inc(Counter2,LLength);
END;
ScrP.NumCols := LLength;
ScrP.NumRows := Row2 - Row1;
END;
PROCEDURE RestoreScrPort( Col,Row :BYTE; VAR ScrP :SCREENPORT );
VAR
Counter1,Counter2 :WORD;
BEGIN
Counter2 := 1;
For Counter1 := Row To (Row + ScrP.NumRows) Do
BEGIN
Move(ScrP.ScreenST[Counter2],TextScreen^[Counter1,Col,0],ScrP.NumCols);
Inc(Counter2,ScrP.NumCols);
END;
END;
BEGIN
IF LastMode = 7 THEN { Check current video mode. }
BaseOfScreen := $B000 { If Monochrome load mono segment. }
ELSE
BaseOfScreen := $B800; { if not load color segment. }
TextScreen := Ptr(BaseOfScreen,0); { Now point TextScreen proper area.}
SaveScrPort(10,5,20,15,BPort);{ Save a cleared part of the screen. }
GotoXY(1,1); { Move to top corner of screen. }
FOR Row := 1 to 20 DO { Generate screen for demonstration. }
FOR Colm := 1 to 80 DO
Write('A');
SaveScrPort(10,5,20,15,SPort);{ Save a portion of the screen. }
ClrScr; { Clear the screen. }
SaveScrPort(10,5,20,15,BPort);{ Redisplay saved portion. }
FOR Colm := 10 to 50 DO { Animate portion right. }
BEGIN
RestoreScrPort(Colm,5,SPort);
Delay(Speed);
RestoreScrPort(Colm,5,BPort);
END;
FOR Row := 5 to 14 DO { Animate Portion Down. }
BEGIN
RestoreScrPort(50,Row,SPort);
Delay(Speed);
RestoreScrPort(50,Row,BPort);
END;
FOR Colm := 50 DOWNTO 10 DO { Animate Portion Left. }
BEGIN
RestoreScrPort(Colm,14,SPort);
Delay(Speed);
RestoreScrPort(Colm,14,BPort);
END;
FOR Row := 14 DOWNTO 5 DO { Animate Portion Up. }
BEGIN
RestoreScrPort(10,Row,SPort);
Delay(Speed);
RestoreScrPort(10,Row,BPort);
END;
RestoreScrPort(10,5,SPort);
Readln;
END.
{***********************************************************************}