161 lines
3.5 KiB
ObjectPascal
161 lines
3.5 KiB
ObjectPascal
{
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Apophysis AV "Phoenix Edition" Copyright (C) 2021 Alice V. Koryagina
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Restored Z_ZVortex variation from Apophysis Cothe's plugin pack
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}
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unit varZVortex;
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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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TVariationZVortex = class(TBaseVariation)
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private
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sides: integer;
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angle, spin: double;
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sds2, ang2: 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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function ResetVariable(const Name: string): 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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////////////////////////
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procedure TVariationZVortex.Prepare;
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begin
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sds2 := sides * 0.5 / pi;
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ang2 := angle * 0.5 * pi;
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end;
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procedure TVariationZVortex.CalcFunction;
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var
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r, phi, t, sn, cn, sn1, cn1: double;
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begin
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r := Math.Hypot(FTx^, FTy^);
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phi := arctan2(FTy^, FTx^);
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if (r = 0) then r := 1E-300;
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t := sds2 * phi + spin * Math.log2(r);
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// AV: these Z+ variations with lost sources are drive me crazy:
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// they are always use vvar in a non-linear way!
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t := vvar * (t - floor(t)) / sds2;
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sn := sin(ang2) * t + phi;
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cn := cos(ang2) * t - 1;
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SinCos(sn, sn1, cn1);
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FPx^ := FPx^ + (r * cn1 + FTx^ * cn);
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FPy^ := FPy^ + (r * sn1 + FTy^ * cn);
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end;
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constructor TVariationZVortex.Create;
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begin
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sides := random(12) + 1;
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angle := 2 * random - 1;
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spin := 2 * random - 1;
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end;
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class function TVariationZVortex.GetInstance: TBaseVariation;
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begin
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Result := TVariationZVortex.Create;
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end;
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class function TVariationZVortex.GetName: string;
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begin
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Result := 'Z_vortex';
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end;
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function TVariationZVortex.GetNrVariables: integer;
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begin
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Result := 3;
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end;
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function TVariationZVortex.GetVariable(const Name: string;
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var value: double): boolean;
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begin
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Result := False;
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if Name = 'Z_vortex_sides' then begin
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value := sides;
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Result := True;
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end
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else if Name = 'Z_vortex_angle' then begin
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value := angle;
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Result := True;
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end
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else if Name = 'Z_vortex_spin' then begin
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value := spin;
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Result := True;
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end;
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end;
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function TVariationZVortex.GetVariableNameAt(const Index: integer): string;
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begin
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case Index of
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0: Result := 'Z_vortex_sides';
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1: Result := 'Z_vortex_angle';
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2: Result := 'Z_vortex_spin';
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else
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Result := '';
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end;
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end;
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function TVariationZVortex.SetVariable(const Name: string;
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var value: double): boolean;
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begin
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Result := False;
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if Name = 'Z_vortex_sides' then begin
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if Value = 0 then Value := 1;
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sides := Round(value);
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Result := True;
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end
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else if Name = 'Z_vortex_angle' then begin
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angle := value;
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Result := True;
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end
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else if Name = 'Z_vortex_spin' then begin
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spin := value;
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Result := True;
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end;
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end;
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function TVariationZVortex.ResetVariable(const Name: string): boolean;
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begin
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Result := False;
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if Name = 'Z_vortex_sides' then begin
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sides := 1;
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Result := True;
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end
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else if Name = 'Z_vortex_angle' then begin
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angle := 0;
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Result := True;
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end
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else if Name = 'Z_vortex_spin' then begin
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spin := 0;
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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(TVariationZVortex), false, false);
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end.
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