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TGraphObject, , :
Type
TGraphObj = Object
x, y: Integer; color: Word;
constructor init(ax, ay: Integer; acolor: Word);
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procedure Draw(acolor: Word); Virtual;
procedure Show;
procedure Hide;
procedure Moveto(dx, dy: Integer);
end;
: x, y ; Color . . TGraphObj, , , . ( x y) ( Color). Draw , Show Hide . MoveTo . , TGraphObj, . .
, . Init TGraphObj .
Draw . TGraphObj ‑. PutPixel, Line .. TGraphObj Draw (). TGraphObj , , , TGraphObj Draw, .
TGraphObj Draw. Init Draw.
TGraphObj Draw . Show, Draw aColor, Color, , Hide Draw c GetBkColor, .. .
TGraphObj , MoveTo. Hide o , Show . Show, Hide Draw. MoveTo , Draw.
, , .. . , .
:
Constructor TGraphobj.init;
Begin x:= ax; y:= ay; color:= acolor; end;
, .. . .
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TGraphObj , Draw .
Procedure TGraphObj.draw;
Begin End;
Hide, Show MoveTo , Draw .
Procedure TGraphObj.Show;
Begin Draw(color); End;
Procedure TGraphObj.Hide;
Begin Draw(getbkcolor); End;
Procedure TGraphObj.MoveTo;
Begin Hide; x:= x + dx; y:= y + dy; Show; End;
TGraphObj TPoint, . , , TGraphObj, Toint Draw:
Type
TPoint = Object(TGraphObj)
Procedure Draw(acolor: word); Virtual;
End;
Procedure TPoint.Draw;
Begin PutPixel(x, y, color); End;
TPoint - TGraphObj. , MoveTo, . TGraphObj.MoveTo TPoint.Draw, . Init TPoint, . TPoint.Draw Init, .
-, . , :
TLine = Object(TGraphObj)
dx, dy: integer;
Constructor init(x1, x2, y1, y2: integer; acolor: word);
Procedure Draw(acolor: word); Virtual;
End;
dx, dy . TLine.Init TGraphObj x, y color. dx, dy.
Constructor TLine.init;
Begin
Inherited init(x1, y1, acolor);
dx:= x2 - x1; dy:= y2 - y1;
End;
TLine.init x, y, color, , TGraphObj.Init.
dx, dy . TLine.Draw dx dy.
Procedure TLine.Draw;
Begin
SetColor(acolor); Line(x, y, x + dx, y + dy);
End;
TCircle :
Type
TCircle = Object (TGraphObj)
r: Integer;
Constructor Init (ax, ay, ar: Integer; acolor: Word);
Procedure Draw (acolor: Word); Virtual;
End;
Constructor TCircle.Init;
Begin
Inherited Init(ax, ay, acolor);
r:= ar
End;
Procedure TCircle.Draw;
Begin
SetColor(acolor);
Circle (x, y, r)
End;
, , :
uses graph;
Type TGraphobj = Object
x, y: integer; color: word;
Constructor init(ax, ay: integer; acolor: word);
Procedure Draw(acolor: word); Virtual;
Procedure Show;
Procedure Hide;
Procedure Moveto(dx, dy: integer);
End;
TPoint = Object(TGraphObj)
Procedure Draw(acolor: word); Virtual;
End;
TLine = Object(TGraphObj)
dx, dy: integer;
Constructor init(x1, x2, y1, y2: integer; acolor: Word);
Procedure Draw(acolor: word);Virtual;
End;
Constructor TGraphobj.init;
Begin x:= ax; y:= ay;color:= acolor; End;
Procedure TGraphObj.Draw;
Begin End;
Procedure TGraphObj.Show;
Begin Draw(color); End;
Procedure TGraphObj.Hide;
Begin Draw(getbkcolor); End;
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Procedure TGraphObj.MoveTo;
Begin Hide; x:= x + dx; y:= y + dy; Show; End;
Procedure TPoint.Draw;
Begin PutPixel(x, y, color); End;
Constructor TLine.init;
Begin
Inherited init(x1,y1,acolor);
dx:= x2 - x1; dy:= y2 - y1;
End;
Procedure TLine.Draw;
Begin
SetColor(acolor); line(x,y,x+dx,y+dy);
End;
Var d, m: integer; pp: TPoint; ll: TLine;
{ TPoint; ll TLine}
Begin
d:= detect;
Initgraph(d, m, c:\pascal\bgi); { }
if graphresult <> 0 then halt(1);
{ }
ll.init(10, 20, 10, 20, 3); ll.oveto (50, 50);
{ }
pp.init(10, 10, 4); pp.oveTo(50, 50);
readln;
end.
, . , : , , . . . .
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Unit GraphApp;
Interface
Type
TGraphApp = Object
Procedure Init;
Procedure Run;
Destructor Done;
End;
Implementatin
Procedure TGraphApp.Init;
...
End;
...
End.
:
Program Grph_Objects;
Uses GraphApp;
Var App: TGraphApp;
Begin
App.Init;
App.Run;
App.Done
End.
App TGraphApp. .
:
Program Grph_Objects;
Uses GraphApp;
Type
PGraphApp = ^ TGraphApp;
Var App: PGraphApp;
Begin
App:= New(PGraphApp, Init);
App^.Run;
App^.Done
End.
GraphObj, :
Unit GraphApp;
Interface
Uses GraphObj; { }
Const NPoints = 100;
Type
{}
TGraphApp = Object
Points: Array [1.. Npoints] of Tpoint;
Line: Tline;
Rect: TRect;
Circ: TCircle;
ActiveObj: Integer;
Procedure Init;
Procedure Run;
Procedure Done;
Procedure ShowAll;
Procedure MoveActiveObj (dx, dy: Integer);
End;
Implementation
Uses Graph, Crt;
Procedure TGraphApp.Init;
{ . Npoints Tpoint, Tline, Tcircle Trect}
Var d, r, Err, k: Integer;
Begin
{ }
d:= Detect;
InitGraph (d, r, \bgi);
Err:= GraphResult;
If Err<>0 Then
Begin
writeln( ,Err); Halt;
End;
{ }
For k:= 1 to Npoints do
Points[k].Init(Random(GetMaxX),Random(GetMaxY), Random(15) + 1);
{ }
Line.Init(GetMaxX div 3, GetMaxY div 3, 2 * GetMaxX div 3,
2 * GetMaxY div 3, LighRed);
Circ.Init(GetMaxX div 2, GetMaxY div 2, GetMaxY div 5, White);
Rect.Init(2 * GetMaxX div 5, 2 * GetMaxY div 5, 3 * GetMaxX div 5,
3 * GetMaxY div 5, Yellow);
ShowAll; { }
ActiveObj:= 1 { }
End; {TGraphApp.Init}
Procedure TGraphApp.Run;
{ Tab }
Var
Stop: Boolean; { Esc}
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Const d = 5; { }
Begin
Stop:= False;
{ }
Repeat
Case ReadKey Of
#27: Stop:= True; { Esc}
#9: Begin { Tab}
inc(ActiveObj);
If ActiveObj > 3 Then ActiveObj:= 3
End;
#0: case Readkey of
#71: MoveActiveObj(-d, -d); { }
#72: MoveActiveObj(0, -d); {}
#73: MoveActiveObj(d, -d); { }
#75: MoveActiveObj(-d, 0); {}
#77: MoveActiveObj(d, 0); {}
#79: MoveActiveObj(-d, d); { }
#80: MoveActiveObj(0, d); {}
#81: MoveActiveObj(d, d); { }
End
End;
ShowAll;
Until Stop
End; {TGraphApp.Run}
Destructor TGraphApp.Done;
{ }
Begin
CloseGraph
End; {TGraphApp.Done}
Procedure TgraphApp.ShowAll;
{ }
Var
k: Integer;
Begin
For k:= 1 to Npoints do Points[k].Show;
Line.Show;
Rect.Show;
Circ.Show;
End;
Procedure TGraphApp.MoveActiveObj;
{ }
Begin
Case ActiveObj of
1: Rect.MoveTo (dx, dy);
2: Circ.MoveTo (dx, dy);
3: Line.MoveTo (dx, dy);
End;
End;
End.
