149 lines
4.2 KiB
ObjectPascal
149 lines
4.2 KiB
ObjectPascal
{
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Apophysis Copyright (C) 2001-2004 Mark Townsend
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Apophysis Copyright (C) 2005-2006 Ronald Hordijk, Piotr Borys, Peter Sdobnov
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Apophysis Copyright (C) 2007-2008 Piotr Borys, Peter Sdobnov
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Apophysis "3D hack" Copyright (C) 2007-2008 Peter Sdobnov
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Apophysis "7X" Copyright (C) 2009-2010 Georg Kiehne
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Apophysis AV "Phoenix Edition" Copyright (C) 2021 Alice V. Koryagina
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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}
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unit varFlux;
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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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TVariationFlux = class(TBaseVariation)
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private
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spread, spr: 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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///////////////////////////////////////////////////////////////////////////////
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procedure TVariationFlux.Prepare;
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begin
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spr := 2 + spread;
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end;
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///////////////////////////////////////
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procedure TVariationFlux.CalcFunction;
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var
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avgr, avga, xmv, xpv, frc,
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x, y, y2, s, c: double;
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begin
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// Avoid reduant calculations by precalculating everything what is used at least twice
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x := FTx^;
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xpv := x + VVAR;
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xmv := x - VVAR;
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y := FTy^;
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y2 := sqr(y);
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// We have a division by zero problem in the original flux
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// (What if y + (x-vvar) == 0 ????)
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frc := sqrt(y2 + sqr(xmv));
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if (frc = 0) then frc := 1.0;
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avgr := VVAR * (spr * sqrt(sqrt(y2 + sqr(xpv) ) / frc));
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avga := (arctan2(y, xmv) - arctan2(y, xpv)) / 2.0;
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SinCos(avga, s, c);
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FPx^ := FPx^ + avgr * c;
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FPy^ := FPy^ + avgr * s;
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FPz^ := FPz^ + vvar * FTz^;
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end;
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///////////////////////////////////////////////////////////////////////////////
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constructor TVariationFlux.Create;
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begin
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spread := 0;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationFlux.GetInstance: TBaseVariation;
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begin
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Result := TVariationFlux.Create;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationFlux.GetName: string;
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begin
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Result := 'flux';
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationFlux.GetVariableNameAt(const Index: integer): string;
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begin
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case Index Of
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0: Result := 'flux_spread';
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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 TVariationFlux.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 = 'flux_spread' then begin
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spread := 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 TVariationFlux.GetNrVariables: integer;
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begin
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Result := 1
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationFlux.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 = 'flux_spread' then begin
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Value := spread;
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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(TVariationFlux), true, false);
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end.
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