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Fillsize := A; 
if A < W then
  A := A * (1 / Fillsize) //wobei 1 ein beliebiger Faktor sein kann, 
        //Fillsize =/=0 und möglichst |Fillsize|>1                    

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W = 100

Fillsize:= SolveForX(PercentDone, W)                    

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A = 3                    

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Fillsize:= SolveForX(PercentDone, W) + A                    

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Fillsize:= SolveForX(PercentDone, W) + A - (( SolveForX(PercentDone, W) / A) * w)                    

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Fillsize := SolveForX(PercentDone, W) + (1 / SolveForX(PercentDone, W)) * A                    

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Fillsize := SolveForX(PercentDone, W) + (1 div (SolveForX(PercentDone, W) + 1) * PaintRect.Left);                    

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Fillsize := trunc(SolveForX(PercentDone, W);/// + (1 / (SolveForX(PercentDone, W)+ 1) * PaintRect.Left));
//Animage ist die gesamte Fläsche 0-100 zB
//PaintRect ist nur die Fläsche inerhalb des Borders zb 3Pixel kleiner als Animage
//FillSize fängt aber bei 0 an mh....

AnImage.Canvas.FillRect(Rect(PaintRect.Left, PaintRect.Top, FillSize, PaintRect.Bottom));                    

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if FBorderStyle = bsSingle then
    InflateRect(PaintRect, -FBorderSize, -FBorderSize);                    

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unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    Timer1: TTimer;
    procedure FormPaint(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
    FPercent: Integer;
    FPixels: Integer;
    procedure PaintGauge;
    procedure CalcPixels;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

const
  MAXWIDTH = 375;
  PENWIDTH = 1;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  FPercent := 0;
  CalcPixels;
  Form1.Repaint;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
  if FPercent < 100 then
  begin
    CalcPixels;
    Inc(FPercent);
    Caption := Format('Prozent: %d / Pixel: %d', [FPercent, FPixels]);
  end
  else
    FPercent := 0;
  Form1.Repaint;
end;

procedure TForm1.FormPaint(Sender: TObject);
begin
  PaintGauge;
end;

procedure TForm1.CalcPixels;
begin
  FPixels := MAXWIDTH * FPercent div 100;
end;

procedure TForm1.PaintGauge;
begin
  // Rahmen
  Canvas.Pen.Style := psSolid;
  Canvas.Pen.Color := clBlack;
  Canvas.Pen.Width := PENWIDTH;
  Canvas.Rectangle(100, 75, 100+MAXWIDTH, 90);
  // Hintergrund
  Canvas.Brush.Style := bsSolid;
  Canvas.Brush.Color := clWhite;
  Canvas.FillRect(Rect(100+PENWIDTH,75+PENWIDTH,100+MAXWIDTH-PENWIDTH,90-PENWIDTH));
  // Fortschritt
  Canvas.Brush.Style := bsSolid;
  Canvas.Brush.Color := clRed;
  Canvas.FillRect(Rect(100+PENWIDTH,75+PENWIDTH,100+PENWIDTH+FPixels+PENWIDTH,90-PENWIDTH));
end;

end.                    

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UseableWidth := MAXWIDTH - (2 * PENWIDTH);                    

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FPixels := UseableWidth * FPercent div 100;                    

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Canvas.Rectangle(100, 75, 100+MAXWIDTH, 90);
Canvas.FillRect(Rect(100+PENWIDTH,75+PENWIDTH,100+MAXWIDTH-PENWIDTH,90-PENWIDTH)); // für den Hintergrund
Canvas.FillRect(Rect(100+PENWIDTH,75+PENWIDTH,100+PENWIDTH+FPixels,90-PENWIDTH)); // für den Fortschritt                    

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Canvas.Rectangle(100-PENWIDTH, 75-PENWIDTH, 100+MAXWIDTH+PENWIDTH, 90+PENWIDTH);
Canvas.FillRect(Rect(100,75,100+MAXWIDTH,90)); // für den Hintergrund
Canvas.FillRect(Rect(100,75,100+FPixels,90)); // für den Fortschritt                    

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procedure TGaugeButton.Paint;
var
   TheImage: TBitmap;
   OverlayImage: TBltBitmap;
   PaintRect: TRect;
   Distance: Integer;
begin
    with Canvas do
    begin
       TheImage:= TBitmap.Create;
       try
          TheImage.Height:= Height;
          TheImage.Width:= Width;

         PaintRect:= ClientRect;
         if FBorderStyle = bsSingle then
            InflateRect(PaintRect, -FBorderWidth, -FBorderWidth);

        OverlayImage:= TBltBitmap.Create;
        try
           OverlayImage.MakeLike(TheImage);
           PaintBorder(OverlayImage);                        //Hier wird die BorderFarbe gemallt
           PaintAsBar(OverlayImage, PaintRect);              //hier wird progress gezeichnet
           PaintALink(OverlayImage);                         //speziell für mich 
        
           PaintAsText(OverlayImage, PaintRect);             //speziel für mich           
           TheImage.Canvas.Draw(0, 0, OverlayImage);

        finally
          OverlayImage.Free;
        end;
  
        Canvas.Draw(0, 0, TheImage);
    finally
       TheImage.Destroy;
    end;
end;


procedure TGaugeButton.PaintBorder(AnImage: TBitmap);
begin
    AnImage.Canvas.Brush.Color:= FBorderColor;
    AnImage.Canvas.FillRect(AnImage.Canvas.ClipRect);
end;


procedure TGaugeButton.PaintAsBar(AnImage: TBitmap; PaintRect: TRect);
var
   FillSize: Longint;
   W, I, mergepos: Integer;
   RsValue, GsValue, BsValue, ReValue, GeValue, BeValue: Double;
begin
    W:= PaintRect.Right;
                                                         
    AnImage.Canvas.Brush.Color:= FBackColor;             
    AnImage.Canvas.FillRect(PaintRect);                  
    AnImage.Canvas.Pen.Width:= 1;
    AnImage.Canvas.Brush.Color:= FStartColor;            

     //---------------das ist die einzigste stelle Wo ich was berücksichtigen muss------------///
    Fillsize := trunc(SolveForX(PercentDone, W)*(W - PaintRect.Left) / W +PaintRect.Left);
    //---------------------------------------------------------------------------------------////
                                                           
    AnImage.Canvas.FillRect(Rect(PaintRect.Left, PaintRect.Top, FillSize, PaintRect.Bottom));
end;                    

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procedure TGaugeButton.Paint;
var
  DrawRect, ChunkRect, CaptionRect: TRect;
begin
  inherited;
  DrawRect := ClientRect;
  Canvas.Brush.Style := bsClear;
  // progress bar
  InflateRect(DrawRect, -2, -2);
  if FMouseDown then
    OffsetRect(DrawRect, 1, 1);
  ThemeServices.DrawElement(Canvas.Handle, ThemeServices.GetElementDetails(tpBar), DrawRect);
  // progress chunk
  InflateRect(DrawRect, -1, -1);
  ChunkRect := DrawRect;
  if FMax > FMin then
    Dec(ChunkRect.Right, (FMax - FPosition) * (ChunkRect.Right - ChunkRect.Left) div (FMax - FMin))
  else if FMax < FMin then
    Inc(ChunkRect.Left, (FMax - FPosition) * (ChunkRect.Right - ChunkRect.Left) div (FMax - FMin));
  ThemeServices.DrawElement(Canvas.Handle, ThemeServices.GetElementDetails(tpChunk), ChunkRect);
  // caption
  CaptionRect := DrawRect;
  DrawText(Canvas.Handle, PChar(Text), Length(Text), CaptionRect, DT_CENTER or DT_WORDBREAK or DT_CALCRECT);
  InflateRect(DrawRect, - (DrawRect.Right - CaptionRect.Right) div 2,
    - (DrawRect.Bottom - CaptionRect.Bottom) div 2);
  DrawText(Canvas.Handle, PChar(Text), Length(Text), DrawRect, DT_CENTER or DT_WORDBREAK);
end;