Реферат: Исследование и моделирование с помощью компьютера электрических полей
If Qc[X,Y]>0 then Form1.Canvas.Brush.Color:=clRed
else Form1.Canvas.Brush.Color:=clBlue;
Circle(X*25+13,Y*25+13,Abs(4*Qc[X,Y])-1,0);
End;
Procedure Circle(X,Y,R:Real;W:Byte);
Begin
If W=0 then Form1.Canvas.Ellipse(Round(X-R),Round(Y-R),Round(X+R),Round(Y+R));
If W=1 then Form1.Image1.Canvas.Ellipse(Round(X-R),Round(Y-R),Round(X+R),Round(Y+R));
End;
Procedure RefreshStatus(X,Y:Byte);
Var Q:Integer;
St:String;
Begin
Form1.StatusBar1.Panels.Items[0].Text:='';
Form1.StatusBar1.Panels.Items[1].Text:='';
Form1.StatusBar1.Panels.Items[2].Text:='';
If Qc[X,Y]=0 then Exit;
Q:=Abs(Qc[X,Y])-1;
Q:=Round(Exp(Q*Ln(2)));
If Qc[X,Y]<0 then Q:=-Q;
St:='X = '+IntToStr(X*25+13)+'('+IntToStr(X)+')'; Form1.StatusBar1.Panels.Items[0].Text:=St;
St:='Y = '+IntToStr(Y*25+13)+'('+IntToStr(Y)+')'; Form1.StatusBar1.Panels.Items[1].Text:=St;
St:='Q = '+IntToStr(Q)+'q'; Form1.StatusBar1.Panels.Items[2].Text:=St;
End;
Procedure PaintLines;
Var I,P:Integer;
B,E:LongWord;
Begin
B:=DateTimeToTimeStamp(Now).Time;
Form1.StatusBar1.Panels.Items[4].Text:='Рисование линий напряженности... Пожалуйста, подождите...';
Prepare;
ElRefresh;
Form1.Image1.Repaint;
Form1.Image1.Canvas.Pen.Color:=clSilver;
For I:=1 to Nc do If Qrc[I,3]<0 then begin
If Qrc[I,3]=-1 then For P:=1 to Z do ElTrack(Qrc[I,1]+3*Cos(((P-1)*360/Z)*Pi/180),Qrc[I,2]+3*Sin(((P-1)*360/Z)*Pi/180),I,1);
If Qrc[I,3]=-2 then For P:=1 to 2*Z do ElTrack(Qrc[I,1]+3*Cos(((P-1)*180/Z)*Pi/180),Qrc[I,2]+3*Sin(((P-1)*180/Z)*Pi/180),I,1);
If Qrc[I,3]=-4 then For P:=1 to 4*Z do ElTrack(Qrc[I,1]+3*Cos(((P-1)*90/Z)*Pi/180),Qrc[I,2]+3*Sin(((P-1)*90/Z)*Pi/180),I,1);
Form1.Image1.Repaint;
end;
For I:=1 to Nc do If Qrc[I,3]>0 then begin
If Qrc[I,3]=1 then For P:=1 to Z do ElTrack(Qrc[I,1]+3*Cos(((P-1)*360/Z)*Pi/180),Qrc[I,2]+3*Sin(((P-1)*360/Z)*Pi/180),I,-1);
If Qrc[I,3]=2 then For P:=1 to 2*Z do ElTrack(Qrc[I,1]+3*Cos(((P-1)*180/Z)*Pi/180),Qrc[I,2]+3*Sin(((P-1)*180/Z)*Pi/180),I,-1);
If Qrc[I,3]=4 then For P:=1 to 4*Z do ElTrack(Qrc[I,1]+3*Cos(((P-1)*90/Z)*Pi/180),Qrc[I,2]+3*Sin(((P-1)*90/Z)*Pi/180),I,-1);
Form1.Image1.Repaint;
end;
ElRefresh;
E:=DateTimeToTimeStamp(Now).Time;
Form1.StatusBar1.Panels.Items[4].Text:='Готово...';
Form1.StatusBar1.Panels.Items[3].Text:=FloatToStr((E-B)/1000)+' сек';
End;
Procedure Prepare;
Var I,P,Q:SmallInt;
Begin
Form1.Image1.Align:=alClient;
Form1.Image1.Canvas.Brush.Color:=clBlack;
Form1.Image1.Canvas.FillRect(Rect(0,0,Form1.Image1.Width,Form1.Image1.Height));
For I:=1 to Nc do For P:=1 to 3 do Qrc[I,P]:=0; Nc:=0;
For I:=0 to 63 do For P:=0 to 47 do
If Qc[I,P]<>0 then begin
Inc(Nc);
Qrc[Nc,1]:=I*25+13;
Qrc[Nc,2]:=P*25+13;
Q:=Abs(Qc[I,P])-1;
Q:=Round(Exp(Q*Ln(2)));
If Qc[I,P]<0 then Q:=-Q;
Qrc[Nc,3]:=Q;
end;
End;
Procedure ElTrack(X,Y:Real;B,K:Integer);
Var U,Vx,Vy,Dx,Dy,Deg:Real;
I,P,Num:Integer;
Br,Alr:Boolean;
Begin
Num:=0; Br:=False; Alr:=False;
SetLength(Last,0);
While (X>0) and (Y>0) and (X<Form1.Width) and (Y<Form1.Height) do begin
Vx:=0; Vy:=0; Deg:=0;
For I:=1 to Nc do begin
Dx:=Qrc[I,1]-X;
Dy:=Qrc[I,2]-Y;
Deg:=Sqrt(Dx*Dx+Dy*Dy);
If (Deg<3) and (I<>B) then Break;
Deg:=Deg*Deg*Deg;
Vx:=Vx+(K*Qrc[I,3]*Dx/Deg);
Vy:=Vy+(K*Qrc[I,3]*Dy/Deg);
end;
If (Deg<3) and (I<>B) then Break;
U:=1; If Sqrt(Vx*Vx+Vy*Vy)=0 then Break;
If Sqrt(Vx*Vx+Vy*Vy)<>0 then U:=1/Sqrt(Vx*Vx+Vy*Vy);
Vx:=U*Vx; Vy:=U*Vy; X:=X+Vx; Y:=Y+Vy;
For I:=0 to Num-1 do If (Last[I,1]=Round(X)) and (Last[I,2]=Round(Y)) and (I<Num-3) then begin
If Form2.RadioButton3.Checked=True then Exit;
If Form2.CheckBox1.Checked=True then begin
For P:=0 to Length(E0)-1 do
If (Abs(Round(X)-E0[P].X)<=1) and (Abs(Round(Y)-E0[P].Y)<=1) then begin
Alr:=True; Break; end;
If Alr=False then begin
with Form1.Image1.Canvas do begin
Brush.Style:=bsClear; Pen.Color:=clYellow;
Ellipse(Round(X-5),Round(Y-5),Round(X+5),Round(Y+5));
Font.Color:=clYellow;
TextOut(Round(X-8),Round(Y+6),'E=0');
Pen.Color:=clSilver;
end;
SetLength(E0,Length(E0)+1);
E0[Length(E0)-1].X:=Round(X); E0[Length(E0)-1].Y:=Round(Y);
end;
end;
Br:=True;
If Form2.RadioButton4.Checked=True then Break;
end;
If Br=True then Break;
Inc(Num); SetLength(Last,Num);
Last[Num-1,1]:=Round(X); Last[Num-1,2]:=Round(Y);
End;
If (Br=True) and (Form2.CheckBox2.Checked=True) and (Form2.RadioButton4.Checked=True) then
Form1.Image1.Canvas.Pen.Color:=clYellow else Form1.Image1.Canvas.Pen.Color:=clSilver;
For I:=1 to Num-2 do begin
Form1.Image1.Canvas.MoveTo(Last[I,1],Last[I,2]);
Form1.Image1.Canvas.LineTo(Last[I+1,1],Last[I+1,2]);
end;
End;
Procedure ElTrackForMoving(X,Y:Real;K:Integer;Stop:Real);
Var Xb,U,Vx,Vy,Dx,Dy,Deg:Real;
Num,I:Integer;
Begin
Num:=0; Xb:=X;
While (X>0) and (Y>0) and (X<Form1.Width) and (Y<Form1.Height) do begin
Vx:=0; Vy:=0;
For I:=1 to Nc do begin
Dx:=Qrc[I,1]-X;
Dy:=Qrc[I,2]-Y;
Deg:=Sqrt(Dx*Dx+Dy*Dy);
If (Deg<Abs(Qrc[I,3])*3) then Exit;
Deg:=Deg*Deg*Deg;
Vx:=Vx+(K*Qrc[I,3]*Dx/Deg);
Vy:=Vy+(K*Qrc[I,3]*Dy/Deg);
end;
U:=1;
If Sqrt(Vx*Vx+Vy*Vy)<>0 then U:=1/Sqrt(Vx*Vx+Vy*Vy);
Vx:=U*Vx; Vy:=U*Vy;
Form1.Image1.Canvas.MoveTo(Round(X),Round(Y));
X:=X+Vx; Y:=Y+Vy;
For I:=0 to Num-1 do If (Last[I,1]=Round(X)) and (Last[I,2]=Round(Y)) and (I<Num-3) then Exit;
Inc(Num); SetLength(Last,Num);
Last[Num-1,1]:=Round(X); Last[Num-1,2]:=Round(Y);
Form1.Image1.Canvas.LineTo(Round(X),Round(Y));
If Stop<>0 then If Abs(Xb-X)>Stop then Exit;
End;
SetLength(Last,0);
End;
Procedure ElRefresh;
Var I:Integer;
Begin
Form1.Image1.Canvas.Pen.Color:=clWhite;
For I:=1 to Nc do begin
If Qrc[I,3]>0 then Form1.Image1.Canvas.Brush.Color:=clRed else Form1.Image1.Canvas.Brush.Color:=clBlue;
If Abs(Qrc[I,3])<>4 then Circle(Qrc[I,1],Qrc[I,2],Abs(4*Qrc[I,3])-1,1) else
Circle(Qrc[I,1],Qrc[I,2],11,1);
end;
End;
Procedure Stop;
Begin
LineExpl:=False; EkviExpl:=False;
SetLength(E0,0);
Form1.StatusBar1.Panels.Items[0].Text:='';
Form1.StatusBar1.Panels.Items[1].Text:='';
Form1.StatusBar1.Panels.Items[2].Text:='';
End;
Procedure Redactor;
Var I,P:SmallInt;
Begin
If Form1.StatusBar1.Panels.Items[4].Text='Редактор' then Exit;
Form1.Image1.Align:=alNone;
Form1.Image1.Height:=0; Form1.Image1.Width:=0;
Form1.Refresh; DrawGrid;
For I:=1 to Nc do For P:=1 to 3 do Qrc[I,P]:=0; Nc:=0;
For I:=0 to 63 do For P:=0 to 47 do RefreshSquare(I,P);
Form1.StatusBar1.Panels.Items[4].Text:='Редактор';
End;
Function Potenc(X,Y:Integer):Real;
Var I:Integer;
Tmp,Dist:Real;
Begin
Tmp:=0;
For I:=1 to Nc do begin
Dist:=Sqrt(((Qrc[I,1]-X)*(Qrc[I,1]-X)+(Qrc[I,2]-Y)*(Qrc[I,2]-Y)));
If Dist<>0 then Tmp:=Tmp+(Qrc[I,3]/Dist) else begin Potenc:=0; Exit; end;
end;
Potenc:=Tmp;
End;
Function RealPotenc(X,Y:Integer):Real;
Var I:Integer;
Dx,Dy,Tmp,Dist:Real;
Begin
Tmp:=0;
For I:=1 to Nc do begin
Dx:=(Qrc[I,1]-X)/25*StrToFloat(Form2.Edit2.Text);
Dy:=(Qrc[I,2]-Y)/25*StrToFloat(Form2.Edit2.Text);
Dist:=Sqrt(Dx*Dx+Dy*Dy);
If Dist<>0 then Tmp:=Tmp+(Qrc[I,3]*StrToFloat(Form2.Edit1.Text)/Dist) else begin RealPotenc:=0; Exit; end;
end;
RealPotenc:=Tmp/StrToFloat(Form2.Edit3.Text);
End;
Function CheckEkviBegin(X,Y:Integer):Boolean;
Begin
CheckEkviBegin:=False;
If (X-1=EkX) and ((Y-1=EkY) or (Y=EkY) or (Y+1=EkY)) then CheckEkviBegin:=True;
If (X+1=EkX) and ((Y-1=EkY) or (Y=EkY) or (Y+1=EkY)) then CheckEkviBegin:=True;
If (X=EkX) and ((Y-1=EkY) or (Y+1=EkY)) then CheckEkviBegin:=True;
End;
Procedure PaintEkvi(X,Y:Integer;Pot:Real;O:Byte);
Var P:Array[1..4] of Real;
M:Array[1..4] of Boolean;
Xt,Yt:Integer;
I,Min:Byte;
Begin
For I:=1 to 4 do P[I]:=0; For I:=1 to 4 do M[I]:=True;
P[1]:=Abs(Pot-Potenc(X,Y-1)); P[2]:=Abs(Pot-Potenc(X+1,Y));
P[3]:=Abs(Pot-Potenc(X,Y+1)); P[4]:=Abs(Pot-Potenc(X-1,Y));
If Potenc(X,Y-1)=0 then Exit;
If Potenc(X,Y+1)=0 then Exit;
If Potenc(X+1,Y)=0 then Exit;
If Potenc(X-1,Y)=0 then Exit;
If O=1 then begin Ekv[X+1,Y+1]:=True; Ekv[X-1,Y+1]:=True; end;
If O=2 then begin Ekv[X-1,Y-1]:=True; Ekv[X-1,Y+1]:=True; end;
