new variation: rectangles

2.10/Source/varRectangles.pas

@@ -0,0 +1,178 @@
+{
+     Apophysis Copyright (C) 2001-2004 Mark Townsend
+     Apophysis Copyright (C) 2005-2006 Ronald Hordijk, Piotr Borys, Peter Sdobnov
+     Apophysis Copyright (C) 2007 Piotr Borys, Peter Sdobnov
+
+     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.
+}
+{
+     This variation was started by Michael Faber
+}
+
+unit varRectangles;
+
+interface
+
+uses
+  BaseVariation, XFormMan;
+
+type
+  TVariationRectangles = class(TBaseVariation)
+  private
+    FRectanglesX, FRectanglesY, RectanglesXFactor: double;
+  public
+    constructor Create;
+
+    class function GetName: string; override;
+    class function GetInstance: TBaseVariation; override;
+
+    class function GetNrVariables: integer; override;
+    class 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;
+
+    procedure GetCalcFunction(var f: TCalcFunction); override;
+    procedure CalcFunction; override;
+    procedure CalcZeroX;
+    procedure CalcZeroY;
+    procedure CalcZeroXY;
+
+  end;
+
+implementation
+
+uses
+  Math;
+
+{ TVariationRectangles }
+
+///////////////////////////////////////////////////////////////////////////////
+
+procedure TVariationRectangles.GetCalcFunction(var f: TCalcFunction);
+begin
+  if IsZero(FRectanglesX) then begin
+    if IsZero(FRectanglesY) then
+      f := CalcZeroXY
+    else
+      f := CalcZeroX;
+  end
+  else if IsZero(FRectanglesY) then
+    f := CalcZeroY
+  else f := CalcFunction;
+end;
+
+procedure TVariationRectangles.CalcFunction;
+begin
+  FPx^ := FPx^ + vvar * ((2*floor(FTx^/FRectanglesX) + 1)*FRectanglesX - FTx^);
+  FPy^ := FPy^ + vvar * ((2*floor(FTy^/FRectanglesY) + 1)*FRectanglesY - FTy^);
+end;
+
+procedure TVariationRectangles.CalcZeroX;
+begin
+  FPx^ := FPx^ + vvar * FTx^;
+  FPy^ := FPy^ + vvar * ((2*floor(FTy^/FRectanglesY) + 1)*FRectanglesY - FTy^);
+end;
+
+procedure TVariationRectangles.CalcZeroY;
+begin
+  FPx^ := FPx^ + vvar * ((2*floor(FTx^/FRectanglesX) + 1)*FRectanglesX - FTx^);
+  FPy^ := FPy^ + vvar * FTy^;
+end;
+
+procedure TVariationRectangles.CalcZeroXY;
+begin
+  FPx^ := FPx^ + vvar * FTx^;
+  FPy^ := FPy^ + vvar * FTy^;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+class function TVariationRectangles.GetName: string;
+begin
+  Result := 'rectangles';
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+class function TVariationRectangles.GetVariableNameAt(const Index: integer): string;
+begin
+  case Index Of
+  0: Result := 'rectangles_x';
+  1: Result := 'rectangles_y';
+  2: Result := 'rectangles_x_factor';
+  else
+    Result := '';
+  end
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+class function TVariationRectangles.GetNrVariables: integer;
+begin
+  Result := 3;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+function TVariationRectangles.SetVariable(const Name: string; var value: double): boolean;
+begin
+  Result := False;
+  if Name = 'rectangles_x' then begin
+    FRectanglesX := Value;
+    Result := True;
+  end else if Name = 'rectangles_y' then begin
+    FRectanglesY := Value;
+    Result := True;
+  end
+  else if Name = 'rectangles_x_factor' then begin
+    RectanglesXFactor := Value;
+    Result := True;
+  end
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+function TVariationRectangles.GetVariable(const Name: string; var value: double): boolean;
+begin
+  Result := False;
+  if Name = 'rectangles_x' then begin
+    Value := FRectanglesX;
+    Result := True;
+  end else if Name = 'rectangles_y' then begin
+    Value := FRectanglesY;
+    Result := True;
+  end
+  else if Name = 'rectangles_x_factor' then begin
+    Value := RectanglesXFactor;
+    Result := True;
+  end
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+constructor TVariationRectangles.Create;
+begin
+  inherited Create;
+
+  FRectanglesX  := 1.0;
+  FRectanglesY := 1.0;
+  RectanglesXFactor := 2.0;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+class function TVariationRectangles.GetInstance: TBaseVariation;
+begin
+  Result := TVariationRectangles.Create;
+end;
+
+///////////////////////////////////////////////////////////////////////////////
+initialization
+  RegisterVariation(TVariationRectangles);
+end.