Курсовая работа по информатике
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| UNIT VGA13h;
INTERFACE Type PScreen = ^TScreen; TScreen = Array [0..199,0..319] of Byte; Const ScreenHeight = 200; ScreenWidth = 320; GetMaxY = ScreenHeight-1; GetMaxX = ScreenWidth-1; MidX = GetMaxX div 2; MidY = GetMaxY div 2; PageSize = ScreenHeight*ScreenWidth; QuarterSize = PageSize div 4; VideoSegment:Word = 0; Base1:Word = 0; Base2:Word = 0; Page1:PScreen = NIL; Page2:PScreen = NIL; Function DetectVGA:Boolean; Procedure SetGraphMode; Procedure SetTextMode; Procedure MakePixelSquare; Procedure CopyBase(Source,Destin:Word); Procedure ClearBase(Base:Word); Procedure FillBase(Base,Ofs,Count:Word;Color:Longint); Procedure MoveBase(Source,Destin,Count:Word); Procedure TileBase(Base,Ofs,Count:Word;Tile:Pointer;Len:Word); Procedure PutPixel(Base:Word;x,y:Integer;Color:Byte); Function GetPixel(Base:Word;x,y:Integer):Byte; Procedure Line(Base:Word;x1,y1,x2,y2:Integer;Color:Byte); Procedure VLine(Base:Word;x,y1,y2:Integer;Color:Byte); Procedure HLine(Base:Word;y,x1,x2:Integer;Color:Byte); Procedure Bar(Base:Word;x1,y1,x2,y2:Integer;Color:Byte); Procedure Polygon(Base:Word;x1,y1,x2,y2,x3,y3,x4,y4:Integer;c:Byte); Function InitVirtualPage:Boolean; Procedure DoneVirtualPage; IMPLEMENTATION Var VirtualPage:Pointer; {$L VGA13H.OBJ} Function DetectVGA; external; Procedure SetGraphMode; external; Procedure SetTextMode; external; Procedure MakePixelSquare; external; Procedure CopyBase; external; Procedure ClearBase; external; Procedure FillBase; external; Procedure MoveBase; external; Procedure TileBase; external; Procedure PutPixel; external; Function GetPixel; external; Procedure HLine; external; Procedure VLine; external; Procedure Polygon; Var xpos:array [0..199,0..1] of Word; mny,mxy,y:Integer; i:Word; s1,s2,s3,s4:Shortint; begin mny:=y1; if y2 if y2>mxy then mxy:=y2; if y3>mxy then mxy:=y3; if y4>mxy then mxy:=y4; s1:=byte(y1 if y1<>y2 then Repeat xpos[y,byte(y1 Until y=y2+s1 else xpos[y,byte(y1 if y2<>y3 then Repeat xpos[y,byte(y2 Until y=y3+s2 else xpos[y,byte(y2 if y3<>y4 then Repeat xpos[y,byte(y3 Until y=y4+s3 else xpos[y,byte(y3 if y4<>y1 then Repeat xpos[y,byte(y4 Until y=y1+s4 else xpos[y,byte(y1 end; Procedure Line; Var dx,dy,sx,sy,d,d1,d2,x,y,i:Integer; begin dx:=Abs(x2-x1); dy:=Abs(y2-y1); if x2>=x1 then sx:=+1 else sx:=-1; if y2>=y1 then sy:=+1 else sy:=-1; Mem[Base:(y1 shl 8)+(y1 shl 6)+x1]:=Color; if dy<=dx then begin d:=(dy shl 1)-dx; d1:=dy shl 1; d2:=(dy-dx) shl 1; x:=x1+sx; y:=y1; for i:=1 to dx do begin if d>0 then begin d:=d+d2; y:=y+sy; end else d:=d+d1; Mem[Base:(y shl 8)+(y shl 6)+x]:=Color; x:=x+sx; end; end else begin d:=(dx shl 1)-dy; d1:=dx shl 1; d2:=(dx-dy) shl 1; x:=x1; y:=y1+sy; for i:=1 to dy do begin if d>0 then begin d:=d+d2; x:=x+sx; end else d:=d+d1; Mem[Base:(y shl 8)+(y shl 6)+x]:=Color; y:=y+sy; end; end; end; Procedure Bar; Var Row,Column:Integer; begin for Row:=y1 to y2 do for Column:=x1 to x2 do Mem[Base:(Row shl 8)+(Row shl 6)+Column]:=Color; end; Function InitVirtualPage; Var Temp:Longint; begin VirtualPage:=NIL; Base2:=0; Page2:=NIL; InitVirtualPage:=false; GetMem(VirtualPage,PageSize+15); Temp:=(Longint(Seg(VirtualPage^)) shl 4)+Longint(Ofs(VirtualPage^)); if Temp and $F<>0 then Temp:=(Temp shr 4)+1 else Temp:=Temp shr 4; Base2:=Temp; Page2:=Ptr(Base2,0); ClearBase(Base2); InitVirtualPage:=true; end; Procedure DoneVirtualPage; begin FreeMem(VirtualPage,PageSize+15); VirtualPage:=NIL; Base2:=0; Page2:=NIL; end; {==================================================================} BEGIN VideoSegment:=SegA000; Base1:=VideoSegment; Page1:=Ptr(Base1,0); InitVirtualPage; END. жүктеу/скачать 201,5 Kb. Достарыңызбен бөлісу:
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