155 lines
3.5 KiB
ObjectPascal
155 lines
3.5 KiB
ObjectPascal
unit varFan2;
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interface
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uses
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BaseVariation, XFormMan;
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type
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TVariationFan2 = class(TBaseVariation)
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private
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FX, FY: double;
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dy, dx, dx2: double;
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public
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constructor Create;
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class function GetName: string; override;
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class function GetInstance: TBaseVariation; override;
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function GetNrVariables: integer; override;
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function GetVariableNameAt(const Index: integer): string; override;
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function SetVariable(const Name: string; var value: double): boolean; override;
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function GetVariable(const Name: string; var value: double): boolean; override;
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procedure Prepare; override;
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procedure CalcFunction; override;
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end;
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implementation
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uses
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Math;
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{ TVariationFan2 }
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///////////////////////////////////////////////////////////////////////////////
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procedure TVariationFan2.Prepare;
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const
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EPS = 1E-10;
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begin
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dy := FY;
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dx := pi * (sqr(FX) + EPS);
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dx2 := dx/2;
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end;
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procedure TVariationFan2.CalcFunction;
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var
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r, a : double;
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sinr, cosr: double;
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Angle: double;
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begin
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{
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r := sqrt(FTx^ * FTx^ + FTy^ * FTy^);
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if (FTx^ < -EPS) or (FTx^ > EPS) or (FTy^ < -EPS) or (FTy^ > EPS) then
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Angle := arctan2(FTx^, FTy^)
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else
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Angle := 0.0;
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dy := FY;
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dx := PI * (sqr(FX) + EPS);
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dx2 := dx/2;
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t := Angle+dy - System.Int((Angle + dy)/dx) * dx;
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if (t > dx2) then
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a := Angle - dx2
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else
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a := Angle + dx2;
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FPx^ := FPx^ + vvar * r * sin(a);
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FPy^ := FPy^ + vvar * r * cos(a);
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}
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Angle := arctan2(FTx^, FTy^);
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if System.Frac((Angle + dy)/dx) > 0.5 then
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a := Angle - dx2
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else
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a := Angle + dx2;
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asm // SinCos(a, sinr, cosr);
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FLD qword ptr [a]
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FSINCOS
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FSTP qword ptr [sinr]
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FSTP qword ptr [cosr]
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FWAIT
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end;
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r := vvar * sqrt(sqr(FTx^) + sqr(FTy^));
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FPx^ := FPx^ + r * cosr;
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FPy^ := FPy^ + r * sinr;
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end;
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///////////////////////////////////////////////////////////////////////////////
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constructor TVariationFan2.Create;
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begin
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FX := 2 * Random - 1;
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FY := 2 * Random - 1;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationFan2.GetInstance: TBaseVariation;
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begin
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Result := TVariationFan2.Create;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationFan2.GetName: string;
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begin
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Result := 'fan2';
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationFan2.GetVariableNameAt(const Index: integer): string;
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begin
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case Index Of
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0: Result := 'fan2_x';
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1: Result := 'fan2_y';
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else
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Result := '';
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end
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationFan2.SetVariable(const Name: string; var value: double): boolean;
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begin
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Result := False;
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if Name = 'fan2_x' then begin
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FX := Value;
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Result := True;
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end else if Name = 'fan2_y' then begin
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FY := Value;
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Result := True;
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end
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationFan2.GetNrVariables: integer;
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begin
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Result := 2
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationFan2.GetVariable(const Name: string; var value: double): boolean;
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begin
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Result := False;
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if Name = 'fan2_x' then begin
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Value := FX;
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Result := True;
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end else if Name = 'fan2_y' then begin
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Value := FY;
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Result := True;
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end
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end;
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///////////////////////////////////////////////////////////////////////////////
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initialization
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RegisterVariation(TVariationClassLoader.Create(TVariationFan2));
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end.
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