Initial commit

Variations/varPreSpherical.pas

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+{
+     Apophysis Copyright (C) 2001-2004 Mark Townsend
+     Apophysis Copyright (C) 2005-2006 Ronald Hordijk, Piotr Borys, Peter Sdobnov
+     Apophysis Copyright (C) 2007-2008 Piotr Borys, Peter Sdobnov
+     
+     Apophysis "3D hack" Copyright (C) 2007-2008 Peter Sdobnov
+     Apophysis "7X" Copyright (C) 2009-2010 Georg Kiehne
+     Apophysis AV "Phoenix Edition" Copyright (C) 2021 Alice V. Koryagina
+
+     This program is free software; you can redistribute it and/or modify
+     it under the terms of the GNU General Public License as published by
+     the Free Software Foundation; either version 2 of the License, or
+     (at your option) any later version.
+
+     This program is distributed in the hope that it will be useful,
+     but WITHOUT ANY WARRANTY; without even the implied warranty of
+     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+     GNU General Public License for more details.
+
+     You should have received a copy of the GNU General Public License
+     along with this program; if not, write to the Free Software
+     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+}
+
+unit varPreSpherical;
+
+interface
+
+uses
+  BaseVariation, XFormMan;
+
+type
+  TVariationPreSpherical = class(TBaseVariation)
+  public
+    constructor Create;
+
+    class function GetName: string; override;
+    class function GetInstance: TBaseVariation; override;
+
+    procedure CalcFunction; override;
+  end;
+
+implementation
+
+uses
+  Math;
+
+{ TVariationPreSpherical }
+
+///////////////////////////////////////////////////////////////////////////////
+procedure TVariationPreSpherical.CalcFunction;
+var r: double;
+begin
+  r := vvar / (sqr(FTx^) + sqr(FTy^) + 10e-300);
+  FTx^ := FTx^ * r;
+  FTy^ := FTy^ * r;
+  // FTz^ := VVAR * FTz^;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+constructor TVariationPreSpherical.Create;
+begin
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+class function TVariationPreSpherical.GetInstance: TBaseVariation;
+begin
+  Result := TVariationPreSpherical.Create;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+class function TVariationPreSpherical.GetName: string;
+begin
+  Result := 'pre_spherical';
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+initialization
+  RegisterVariation(TVariationClassLoader.Create(TVariationPreSpherical), false, false);
+end.