TPlotgrid zeichnet Strich in Polygon

[Stewag]

... hier die Lösung, aus https://www.youtube.com/watch?app=de...nnel=QuarkCube
:-)

Code:

var
  FPoints: TPolygon;

procedure TfMain.CalculateCos;
var
  i: Integer;
begin
  SetLength(FPoints, Resolution + 1); // Alloc space for number of points to be calculated
  SetParams;
  for i := 0 to High(FPoints) do
  begin
    FPoints[i].X := Origin.X + Radian * xPixels / Pi; // Calculate X value with scaling
    FPoints[i].Y := Origin.Y - cos(Radian) * yPixels; // Calculate Y value (f(X)) with scaling
    Radian := Radian + Interval; // Set next point
  end;
end;

procedure TfMain.PlotGridPaint(Sender: TObject; Canvas: TCanvas; const ARect: TRectF);
var
  i: Integer;
begin
  PlotGrid.Canvas.Stroke.Thickness := 2; // Liniendicke  
  CalculateCos; // hier nur Cosinus
  PlotGrid.Canvas.Stroke.Color := TAlphaColorRec.White;

  for i := 1 to High(FPoints) do
    PlotGrid.Canvas.DrawLine(FPoints[i - 1], FPoints[i], 1);
end;