{ 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 varFan2; interface uses BaseVariation, XFormMan; type TVariationFan2 = class(TBaseVariation) private FX, FY: double; dy, dx, dx2: double; old: byte; procedure CalcNew; 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; procedure GetCalcFunction(var f: TCalcFunction); override; end; implementation uses Math; { TVariationFan2 } /////////////////////////////////////////////////////////////////////////////// procedure TVariationFan2.Prepare; const EPS = 1E-10; begin dy := FY; dx := pi * (sqr(FX) + EPS); dx2 := dx/2; end; procedure TVariationFan2.GetCalcFunction(var f: TCalcFunction); begin if old = 1 then f := CalcFunction else f := CalcNew; end; procedure TVariationFan2.CalcFunction; var r, a : double; sinr, cosr: double; Angle: double; begin Angle := arctan2(FTx^, FTy^); if System.Frac((Angle + dy)/dx) > 0.5 then a := Angle - dx2 else a := Angle + dx2; SinCos(a, sinr, cosr); r := vvar * sqrt(sqr(FTx^) + sqr(FTy^)); FPx^ := FPx^ + r * sinr; FPy^ := FPy^ + r * cosr; end; /////////////////////////////////////////////////////////////////////////////// procedure TVariationFan2.CalcNew; var r, a : double; sinr, cosr: double; Angle: double; begin Angle := arctan2(FTx^, FTy^); if System.Frac((Angle + dy)/dx) > 0.5 then a := Angle - dx2 else a := Angle + dx2; SinCos(a, sinr, cosr); r := vvar * sqrt(sqr(FTx^) + sqr(FTy^)); FPx^ := FPx^ + r * cosr; FPy^ := FPy^ + r * sinr; FPz^ := FPz^ + vvar * FTz^; end; constructor TVariationFan2.Create; begin FX := 2 * Random - 1; FY := 2 * Random - 1; old := 1; end; /////////////////////////////////////////////////////////////////////////////// class function TVariationFan2.GetInstance: TBaseVariation; begin Result := TVariationFan2.Create; end; /////////////////////////////////////////////////////////////////////////////// class function TVariationFan2.GetName: string; begin Result := 'fan2'; end; /////////////////////////////////////////////////////////////////////////////// function TVariationFan2.GetVariableNameAt(const Index: integer): string; begin case Index Of 0: Result := 'fan2_x'; 1: Result := 'fan2_y'; 2: Result := 'fan2_old'; else Result := ''; end end; /////////////////////////////////////////////////////////////////////////////// function TVariationFan2.SetVariable(const Name: string; var value: double): boolean; begin Result := False; if Name = 'fan2_x' then begin FX := Value; Result := True; end else if Name = 'fan2_y' then begin FY := Value; Result := True; end else if Name = 'fan2_old' then begin if (Value < 0) then Value := 0; if (Value > 1) then Value := 1; old := Round(Value); Result := True; end end; function TVariationFan2.ResetVariable(const Name: string): boolean; begin Result := False; if Name = 'fan2_x' then begin FX := 0; Result := True; end else if Name = 'fan2_y' then begin FY := 0; Result := True; end else if Name = 'fan2_old' then begin old := 1; Result := True; end end; /////////////////////////////////////////////////////////////////////////////// function TVariationFan2.GetNrVariables: integer; begin Result := 3 end; /////////////////////////////////////////////////////////////////////////////// function TVariationFan2.GetVariable(const Name: string; var value: double): boolean; begin Result := False; if Name = 'fan2_x' then begin Value := FX; Result := True; end else if Name = 'fan2_y' then begin Value := FY; Result := True; end else if Name = 'fan2_old' then begin Value := old; Result := True; end end; /////////////////////////////////////////////////////////////////////////////// initialization RegisterVariation(TVariationClassLoader.Create(TVariationFan2), true, false); end.