147 lines
4.2 KiB
ObjectPascal
147 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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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 varEscher;
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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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TVariationEscher = class(TBaseVariation)
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private
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escher_beta, bc, bd: 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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function ResetVariable(const Name: string): 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 TVariationEscher.Prepare;
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begin
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sincos(escher_beta, bd, bc);
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bc := 0.5 * (1.0 + bc);
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bd := 0.5 * bd;
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end;
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procedure TVariationEscher.CalcFunction;
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var sn, cs, ang, lnr, m : double;
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begin
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ang := arctan2(FTy^, FTx^); // Angular polar dimension
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lnr := 0.5 * ln(FTx^*FTx^ + FTy^*FTy^); // Natural logarithm of the radial polar dimension.
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m := VVAR * exp(bc * lnr - bd * ang);
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sincos(bc * ang + bd * lnr, sn, cs);
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FPx^ := FPx^ + m * cs;
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FPy^ := FPy^ + m * sn;
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FPz^ := FPz^ + vvar * FTz^;
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end;
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///////////////////////////////////////////////////////////////////////////////
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constructor TVariationEscher.Create;
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begin
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escher_beta := 0;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationEscher.GetInstance: TBaseVariation;
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begin
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Result := TVariationEscher.Create;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationEscher.GetName: string;
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begin
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Result := 'escher';
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationEscher.GetVariableNameAt(const Index: integer): string;
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begin
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case Index Of
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0: Result := 'escher_beta';
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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 TVariationEscher.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 = 'escher_beta' then begin
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value := frac((value + PI) / PI2) * PI2 - PI; // AV: added 2*pi precalc
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escher_beta := Value;
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Result := True;
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end
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end;
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function TVariationEscher.ResetVariable(const Name: string): boolean;
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begin
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Result := False;
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if Name = 'escher_beta' then begin
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escher_beta := 0;
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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 TVariationEscher.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 TVariationEscher.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 = 'escher_beta' then begin
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Value := escher_beta;
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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(TVariationEscher), true, false);
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end. |