95a2f54683
git-svn-id: https://svn.code.sf.net/p/apophysis7x/svn/trunk@1 a5d1c0f9-a0e9-45c6-87dd-9d276e40c949
148 lines
4.4 KiB
ObjectPascal
148 lines
4.4 KiB
ObjectPascal
{
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Apophysis Copyright (C) 2001-2004 Mark Townsend
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Apophysis Copyright (C) 2005-2006 Ronald Hordijk, Piotr Borys, Peter Sdobnov
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Apophysis Copyright (C) 2007-2008 Piotr Borys, Peter Sdobnov
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Apophysis "3D hack" Copyright (C) 2007-2008 Peter Sdobnov
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Apophysis "7X" Copyright (C) 2009-2010 Georg Kiehne
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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}
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unit varRings2;
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interface
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uses
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BaseVariation, XFormMan;
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type
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TVariationRings2 = class(TBaseVariation)
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private
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FVal, dx: double;
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public
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constructor Create;
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class function GetName: string; override;
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class function GetInstance: TBaseVariation; override;
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function GetNrVariables: integer; override;
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function GetVariableNameAt(const Index: integer): string; override;
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function SetVariable(const Name: string; var value: double): boolean; override;
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function GetVariable(const Name: string; var value: double): boolean; override;
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procedure Prepare; override;
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procedure CalcFunction; override;
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end;
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implementation
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uses
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Math;
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{ TVariationRings2 }
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///////////////////////////////////////////////////////////////////////////////
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procedure TVariationRings2.Prepare;
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const
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EPS = 1E-10;
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begin
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dx := sqr(FVal) + EPS;
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end;
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procedure TVariationRings2.CalcFunction;
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var
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r: double;
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Length: double;
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Angle: double;
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begin
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Length := sqrt(sqr(FTx^) + sqr(FTy^));
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{ // all this range-checking crap only slows us down...
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if (FTx^ < -EPS) or (FTx^ > EPS) or (FTy^ < -EPS) or (FTy^ > EPS) then
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Angle := arctan2(FTx^, FTy^)
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else
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Angle := 0.0;
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} // ...and besides, we don't need arctan() if we have Length!
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// dx := sqr(FVal) + EPS; - we can precalc it!!!
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// r := Length + dx - System.Int((Length + dx)/(2 * dx)) * 2 * dx - dx + Length * (1-dx);
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// ^^^^......he he, lots of useless calculations......^^^^
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r := vvar * (2 - dx * (System.Int((Length/dx + 1)/2) * 2 / Length + 1));
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FPx^ := FPx^ + r * FTx^;
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FPy^ := FPy^ + r * FTy^;
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FPz^ := FPz^ + vvar * FTz^;
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end;
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///////////////////////////////////////////////////////////////////////////////
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constructor TVariationRings2.Create;
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begin
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FVal := Random * 2;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationRings2.GetInstance: TBaseVariation;
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begin
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Result := TVariationRings2.Create;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationRings2.GetName: string;
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begin
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Result := 'rings2';
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationRings2.GetVariableNameAt(const Index: integer): string;
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begin
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case Index Of
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0: Result := 'rings2_val';
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else
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Result := '';
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end
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationRings2.SetVariable(const Name: string; var value: double): boolean;
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begin
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Result := False;
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if Name = 'rings2_val' then begin
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FVal := Value;
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Result := True;
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end
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationRings2.GetNrVariables: integer;
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begin
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Result := 1
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationRings2.GetVariable(const Name: string; var value: double): boolean;
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begin
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Result := False;
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if Name = 'rings2_val' then begin
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Value := FVal;
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Result := True;
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end
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end;
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///////////////////////////////////////////////////////////////////////////////
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initialization
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RegisterVariation(TVariationClassLoader.Create(TVariationRings2), true, false);
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end.
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