145 lines
3.4 KiB
ObjectPascal
145 lines
3.4 KiB
ObjectPascal
unit varPerspective;
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interface
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uses
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BaseVariation, XFormMan;
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const
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var_a_name='perspective_angle';
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var_f_name='perspective_dist';
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type
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TVariationPerspective = class(TBaseVariation)
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private
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angle, focus: double;
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vsin, vf, vfcos: 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 CalcFunction; override;
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procedure Prepare; 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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// TVariationPerspective
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///////////////////////////////////////////////////////////////////////////////
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constructor TVariationPerspective.Create;
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begin
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angle := random;
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focus := 2*random + 1;
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end;
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procedure TVariationPerspective.Prepare;
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begin
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vsin := sin(angle*pi/2);
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vf := vvar * focus;
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vfcos := vf * cos(angle*pi/2);
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end;
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procedure TVariationPerspective.CalcFunction;
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{$if false}
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var
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t: double;
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begin
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t := (focus - fty^*vsin);
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FPx^ := FPx^ + vf * ftx^ / t;
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FPy^ := FPy^ + vfcos * fty^ / t;
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{$else}
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asm
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mov ecx, [eax + FTy]
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fld qword ptr [ecx]
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fld st
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fmul qword ptr [eax + vsin]
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fsubr qword ptr [eax + focus]
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fld st
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mov ecx, [eax + FTx]
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fdivr qword ptr [ecx]
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fmul qword ptr [eax + vf]
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mov ecx, [eax+FPx]
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fadd qword ptr [ecx]
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fstp qword ptr [ecx]
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fdivp st(1), st
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fmul qword ptr [eax + vfcos]
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mov ecx, [eax+FPy]
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fadd qword ptr [ecx]
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fstp qword ptr [ecx]
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fwait
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{$ifend}
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationPerspective.GetInstance: TBaseVariation;
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begin
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Result := TVariationPerspective.Create;
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationPerspective.GetName: string;
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begin
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Result := 'perspective';
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end;
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///////////////////////////////////////////////////////////////////////////////
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class function TVariationPerspective.GetVariableNameAt(const Index: integer): string;
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begin
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case Index of
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0: Result := var_a_name;
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1: Result := var_f_name;
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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 TVariationPerspective.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 = var_a_name then begin
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angle := Value;
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Result := True;
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end else if Name = var_f_name then begin
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focus := 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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class function TVariationPerspective.GetNrVariables: integer;
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begin
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Result := 2;
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end;
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///////////////////////////////////////////////////////////////////////////////
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function TVariationPerspective.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 = var_a_name then begin
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Value := angle;
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Result := True;
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end else if Name = var_f_name then begin
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Value := focus;
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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(TVariationPerspective);
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end.
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