TRadialGradientRenderer.InsertColorStop

procedure InsertColorStop(offsetFrac: single; color: TColor32);


Apart from innermost and outermost gradient colors (see SetParameters), additional colors can be inserted into the color gradient. The innermost color's offset is 0 (zero) and the outermost color's offset is 1, so when inserting additional colors into the gradient, the 'offsetFrac' parameter needs to be between 0 and 1.

  uses Img32, Img32.Fmt.PNG, Img32.vector, Img32.Draw;
  ...
  var
    img: TImage32;
    path: TPathD;
    rec: TRect;
    radGradRend: TRadialGradientRenderer;
  begin
    img.SetSize(256,256);
    rec := img.Bounds;
    Windows.InflateRect(rec, -3,-3);
    path := Pie(rec, angle15, -angle15);
    
    //do the drawing
    DrawLine(img, path, 1, clBlack32, esPolygon);
    radGradRend := TRadialGradientRenderer.Create;
    radGradRend.SetParameters(rec, clFuchsia32, clBlue32);
    radGradRend.InsertColorStop(0.3, clRed32);
    radGradRend.InsertColorStop(0.4, clYellow32);
    radGradRend.InsertColorStop(0.5, clYellow32);
    radGradRend.InsertColorStop(0.7, clLime32);
    radGradRend.InsertColorStop(0.8, clAqua32);
    DrawPolygon(img, path, frNonZero, radGradRend);
    radGradRend.Free;
    DrawLine(img, path, 5, clMaroon32, esPolygon);

    img.SaveToFile('pacman3.png');
    img.Free;
  end;

See Also

SetParameters