{ 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 varHypertile3D2; interface uses BaseVariation, XFormMan; type TVariationHypertile3D2 = class(TBaseVariation) private hypertile3D2_p, hypertile3D2_q: integer; pa, cx, c2, c2x, s2x, s2y, s2z: double; public constructor Create; class function GetName: string; override; class function GetInstance: TBaseVariation; override; function GetNrVariables: integer; override; function GetVariableNameAt(const Index: integer): string; override; function SetVariable(const Name: string; var value: double): boolean; override; function GetVariable(const Name: string; var value: double): boolean; override; function ResetVariable(const Name: string): boolean; override; procedure Prepare; override; procedure CalcFunction; override; end; implementation uses Math; /////////////////////////////////////////////////////////////////////////////// procedure TVariationHypertile3D2.Prepare; var t, qa, r: double; begin pa := PI2 / hypertile3D2_p; qa := PI2 / hypertile3D2_q; t := cos(pa); r := -(t - 1) / (t + cos(qa)); if (r > 0) then r := 1 / sqrt(1 + r) else r := 1; cx := r; c2 := sqr(cx); c2x := 2 * cx; s2x := 1 + c2; s2y := 1 - c2; s2z := 1 - c2; end; procedure TVariationHypertile3D2.CalcFunction; var r2, sina, cosa, x2cx, x, y, vr: double; begin r2 := sqr(FTx^) + sqr(FTy^) + sqr(FTz^); x2cx := c2x * FTx^; x := FTx^ * s2x - cx * (-r2 - 1); y := FTy^ * s2y; vr := vvar / (c2 * r2 + x2cx + 1); SinCos(random(32767) * pa, sina, cosa); FPx^ := FPx^ + vr * (x * cosa + y * sina); FPy^ := FPy^ + vr * (y * cosa - x * sina); FPz^ := FPz^ + vr * (FTz^ * s2z); end; /////////////////////////////////////////////////////////////////////////////// constructor TVariationHypertile3D2.Create; begin hypertile3D2_p := 3; hypertile3D2_q := 7; end; /////////////////////////////////////////////////////////////////////////////// class function TVariationHypertile3D2.GetInstance: TBaseVariation; begin Result := TVariationHypertile3D2.Create; end; /////////////////////////////////////////////////////////////////////////////// class function TVariationHypertile3D2.GetName: string; begin Result := 'hypertile3D2'; end; /////////////////////////////////////////////////////////////////////////////// function TVariationHypertile3D2.GetVariableNameAt(const Index: integer): string; begin case Index Of 0: Result := 'hypertile3D2_p'; 1: Result := 'hypertile3D2_q'; else Result := ''; end end; /////////////////////////////////////////////////////////////////////////////// function TVariationHypertile3D2.SetVariable(const Name: string; var value: double): boolean; begin Result := False; if Name = 'hypertile3D2_p' then begin if Value < 3 then Value := 3; hypertile3D2_p := Round(Value); Result := True; end else if Name = 'hypertile3D2_q' then begin if Value < 3 then Value := 3; hypertile3D2_q := Round(Value); Result := True; end; end; function TVariationHypertile3D2.ResetVariable(const Name: string): boolean; begin Result := False; if Name = 'hypertile3D2_p' then begin hypertile3D2_p := 3; Result := True; end else if Name = 'hypertile3D2_q' then begin hypertile3D2_q := 7; Result := True; end; end; /////////////////////////////////////////////////////////////////////////////// function TVariationHypertile3D2.GetNrVariables: integer; begin Result := 2; end; /////////////////////////////////////////////////////////////////////////////// function TVariationHypertile3D2.GetVariable(const Name: string; var value: double): boolean; begin Result := False; if Name = 'hypertile3D2_p' then begin Value := hypertile3D2_p; Result := True; end else if Name = 'hypertile3D2_q' then begin Value := hypertile3D2_q; Result := True; end; end; /////////////////////////////////////////////////////////////////////////////// initialization RegisterVariation(TVariationClassLoader.Create(TVariationHypertile3D2), true, false); end.