{
     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

     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 varAuger;

interface

uses
  BaseVariation, XFormMan;

type
  TVariationAuger = class(TBaseVariation)
  private
    auger_freq, auger_weight, auger_scale, auger_sym: 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 TVariationAuger.Prepare;
begin
end;

procedure TVariationAuger.CalcFunction;
var x, y, s, t, dx, dy: double;
begin
  x := FTx^;
  y := FTy^;

  s := sin(auger_freq * x);
  t := sin(auger_freq * y);

  dx := x + auger_weight * (0.5 * auger_scale * t + abs(x) * t);
  dy := y + auger_weight * (0.5 * auger_scale * s + abs(y) * s);

  FPx^ := FPx^ + VVAR * (x + auger_sym * (dx - x));
  FPy^ := FPy^ + VVAR * dy;
  FPz^ := FPz^ + VVAR * FTz^;
end;

///////////////////////////////////////////////////////////////////////////////
constructor TVariationAuger.Create;
begin
  auger_freq := 5; auger_weight := 0.5;
  auger_scale := 0.1; auger_sym := 0;
end;

///////////////////////////////////////////////////////////////////////////////
class function TVariationAuger.GetInstance: TBaseVariation;
begin
  Result := TVariationAuger.Create;
end;

///////////////////////////////////////////////////////////////////////////////
class function TVariationAuger.GetName: string;
begin
  Result := 'auger';
end;

///////////////////////////////////////////////////////////////////////////////
function TVariationAuger.GetVariableNameAt(const Index: integer): string;
begin
  case Index Of
  0: Result := 'auger_freq';
  1: Result := 'auger_weight';
  2: Result := 'auger_scale';
  3: Result := 'auger_sym';
  else
    Result := '';
  end
end;

///////////////////////////////////////////////////////////////////////////////
function TVariationAuger.SetVariable(const Name: string; var value: double): boolean;
begin
  Result := False;
  if Name = 'auger_freq' then begin
    auger_freq := Value;
    Result := True;
  end else if Name = 'auger_weight' then begin
    auger_weight := Value;
    Result := True;
  end else if Name = 'auger_scale' then begin
    auger_scale := Value;
    Result := True;
  end else if Name = 'auger_sym' then begin
    auger_sym := Value;
    Result := True;
  end
end;
function TVariationAuger.ResetVariable(const Name: string): boolean;
begin
  Result := False;
  if Name = 'auger_freq' then begin
    auger_freq := 5;
    Result := True;
  end else if Name = 'auger_weight' then begin
    auger_weight := 0.5;
    Result := True;
  end else if Name = 'auger_scale' then begin
    auger_scale := 0.1;
    Result := True;
  end else if Name = 'auger_sym' then begin
    auger_sym := 0;
    Result := True;
  end
end;

///////////////////////////////////////////////////////////////////////////////
function TVariationAuger.GetNrVariables: integer;
begin
  Result := 4
end;

///////////////////////////////////////////////////////////////////////////////
function TVariationAuger.GetVariable(const Name: string; var value: double): boolean;
begin
  Result := False;
  if Name = 'auger_freq' then begin
    Value := auger_freq;
    Result := True;
  end else if Name = 'auger_weight' then begin
    Value := auger_weight;
    Result := True;
  end else if Name = 'auger_scale' then begin
    Value := auger_scale;
    Result := True;
  end else if Name = 'auger_sym' then begin
    Value := auger_sym;
    Result := True;
  end
end;

///////////////////////////////////////////////////////////////////////////////
initialization
  RegisterVariation(TVariationClassLoader.Create(TVariationAuger), true, false);
end.