Diff of /tags/15/Variations/varBipolar.pas [000000] .. [r1]  Maximize  Restore

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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
+
+     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 varBipolar;
+
+interface
+
+uses
+  BaseVariation, XFormMan;
+
+type
+  TVariationBipolar = class(TBaseVariation)
+  private
+    bipolar_shift, v_4, v, s: 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 TVariationBipolar.Prepare;
+begin
+  v_4 := VVAR * 0.15915494309189533576888376337251;
+  v := VVAR * 0.636619772367581343075535053490061;
+  s := -1.57079632679489661923 * (bipolar_shift);
+end;
+
+procedure TVariationBipolar.CalcFunction;
+var x2y2, y, t, x2, f, g : double;
+begin
+  x2y2 := sqr(FTx^) + sqr(FTy^);
+  y := 0.5 * ArcTan2(2.0 * FTy^, x2y2 - 1.0) + (s);
+
+    if (y > 1.57079632679489661923) then
+        y := -1.57079632679489661923 + fmod(y + 1.57079632679489661923, PI)
+    else if (y < -1.57079632679489661923) then
+        y := 1.57079632679489661923 - fmod(1.57079632679489661923 - y, PI);
+
+    t := x2y2 + 1.0;
+    x2 := 2.0 * FTx^;
+
+    f := t + x2;
+    g := t - x2;
+
+    if (g = 0) or (f/g <= 0) then
+      Exit;
+    
+    FPx^ := FPx^ + (v_4) * Ln((t+x2) / (t-x2));
+    FPy^ := FPy^ + (v) * y;
+
+  FPz^ := FPz^ + vvar * FTz^;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+constructor TVariationBipolar.Create;
+begin
+  bipolar_shift := 0;
+  v_4 := 0;
+  v := 0;
+  s := 0;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+class function TVariationBipolar.GetInstance: TBaseVariation;
+begin
+  Result := TVariationBipolar.Create;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+class function TVariationBipolar.GetName: string;
+begin
+  Result := 'bipolar';
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+function TVariationBipolar.GetVariableNameAt(const Index: integer): string;
+begin
+  case Index Of
+  0: Result := 'bipolar_shift';
+  else
+    Result := '';
+  end
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+function TVariationBipolar.SetVariable(const Name: string; var value: double): boolean;
+var temp: double;
+begin
+  Result := False;
+  if Name = 'bipolar_shift' then begin
+    temp := frac(0.5 * (value + 1.0));
+    value := 2.0 * temp - 1.0;
+    bipolar_shift := Value;
+    Result := True;
+  end 
+end;
+function TVariationBipolar.ResetVariable(const Name: string): boolean;
+begin
+  Result := False;
+  if Name = 'bipolar_shift' then begin
+    bipolar_shift := 0;
+    Result := True;
+  end;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+function TVariationBipolar.GetNrVariables: integer;
+begin
+  Result := 1
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+function TVariationBipolar.GetVariable(const Name: string; var value: double): boolean;
+begin
+  Result := False;
+  if Name = 'bipolar_shift' then begin
+    Value := bipolar_shift;
+    Result := True;
+  end
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+initialization
+  RegisterVariation(TVariationClassLoader.Create(TVariationBipolar), true, false);
+end.

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