152 lines
3.9 KiB
ObjectPascal
152 lines
3.9 KiB
ObjectPascal
unit varBlob;
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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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TVariationBlob = class(TBaseVariation)
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private
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FLow, FHigh, FWaves: double;
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VLow, VHeight: 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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class function GetNrVariables: integer; override;
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class 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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{ TVariationBlob }
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///////////////////////////////////////////////////////////////////////////////
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procedure TVariationBlob.Prepare;
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begin
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VHeight := vvar * (FHigh - FLow) / 2;
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VLow := vvar * FLow + VHeight;
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end;
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procedure TVariationBlob.CalcFunction;
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var
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r : double;
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begin
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{
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r := sqrt(FTx^ * FTx^ + FTy^ * FTy^);
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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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r := r * (FLow + (FHigh - FLow) * (0.5 + 0.5 * sin(FWaves * Angle)));
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FPx^ := FPx^ + vvar * r * sin(Angle);
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FPy^ := FPy^ + vvar * r * cos(Angle);
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}
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// --Z-- LOL!!! just look at this:
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// sin(a) = x / r, (well, normal people use y/r, but since we swapped x and y...)
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// then:
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// r * sin(a) = r * x / r = x !!!
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// so, WE DON'T NEED TO CALCULATE "r" AT ALL!!!!!
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// (and no need to calculate sin and cos, ofcourse :)
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// r := (FLow + (FHigh - FLow) * (0.5 + 0.5 * sin(FWaves * Angle)));
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// now let's precalc ^^^^^ all this :)
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r := VLow + VHeight * sin(FWaves * arctan2(FTx^, FTy^));
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FPx^ := FPx^ + r * FTx^;
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FPy^ := FPy^ + r * FTy^;
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// mwahaha, 20% speed increase - and I didn't even use any ASM :-)
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationBlob.GetName: string;
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begin
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Result := 'blob';
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationBlob.GetVariableNameAt(const Index: integer): string;
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begin
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case Index Of
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0: Result := 'blob_low';
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1: Result := 'blob_high';
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2: Result := 'blob_waves';
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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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class function TVariationBlob.GetNrVariables: integer;
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begin
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Result := 3;
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationBlob.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 = 'blob_low' then begin
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FLow := Value;
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Result := True;
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end else if Name = 'blob_high' then begin
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FHigh := Value;
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Result := True;
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end else if Name = 'blob_waves' then begin
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Value := Round(Value);
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FWaves := 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 TVariationBlob.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 = 'blob_low' then begin
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Value := FLow;
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Result := True;
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end else if Name = 'blob_high' then begin
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Value := FHigh;
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Result := True;
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end else if Name = 'blob_waves' then begin
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Value := FWaves;
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Result := True;
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end
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end;
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///////////////////////////////////////////////////////////////////////////////
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constructor TVariationBlob.Create;
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begin
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inherited Create;
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FWaves := Round(2 + 5 * Random);
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FLow := 0.2 + 0.5 * random;
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FHigh := 0.8 + 0.4 * random;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationBlob.GetInstance: TBaseVariation;
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begin
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Result := TVariationBlob.Create;
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end;
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///////////////////////////////////////////////////////////////////////////////
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initialization
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RegisterVariation(TVariationBlob);
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end.
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