TeeCanvas3d + Antialias drawing LineSeries dualcolor

[JES]

Hi,

I don't think that you have compiled your version with global project define: TEEANTIALIAS (because in picture you have two pixels width horizontal line).

So your version uses actually GDI+ library to draw that antialias version.

When TeeChart sources are compiled with TEEANTIALIAS define it still draws non horizontal lines in wrong color.

Janne

[Yeray]

Hi Janne,

We're studying the problem and we'll be back here asap.

[Yeray]

Hello Janne,

I'll send a beta version of the TeeChart sources to the mail account you have registered in this forum so you can test this.
Now, adding the TEEANTIALIAS define, we get this:

image.png (25.89 KiB) Viewed 11100 times

Note the color isn't perfect. This is because our AntiAlias is doing a blending with the background and it gives blue-greyed line.

[JES]

Hi,

it is better now, but when data is dense and lines overlaps each other it still looks bad.
Can it be fixed like it was in older versions.

Dense data

DualColor.png (130.2 KiB) Viewed 11115 times

Data that does not overlap lines is better (actually this kind of data/drawing GDI+ is good)

ok.png (39.3 KiB) Viewed 11110 times

Thanks,
Janne

[Yeray]

Hi Janne,

It doesn't look so bad for me only changing the color and the number of values.
Isn't this what you get with the example some posts above and the following changes?

Code: Select all

  with Chart1.AddSeries(TFastLineSeries) as TFastLineSeries do
  begin
    Color:=clRed;
    //AddArray([10,10,12,1,15,13,13]);
    FillSampleValues(100000);
    BeforeDrawValues:=SeriesBeforeDrawValues;
    AfterDrawValues:=SeriesAfterDrawValues;
  end;

2014-03-18_1637.png (33.91 KiB) Viewed 11057 times

On the other hand, having so many overlapping points makes the chart difficult to read. You may be interested on setting the TFastLineSeries DrawAllPoints property to false or reducing the number of points with the TDownSamplingFunction.

[JES]

Hi,

it looks same as your sample.

I am drawing process data values and user can choose freely resolution, so it can contain a lot of values (and I don't want to reduce visible points programmatically, eq. DrawAllPoints:=false; if user have choosen to see accurate data).

Why is it not possible to get old Antialias drawing back, this does not look good (I'm using now GDI drawing with these new versions but old Antialias was much nicer looking).

This is not acceptable

image.png (381.79 KiB) Viewed 11041 times

Thanks,
Janne

[JES]

Hi,

any news on this issue?

Janne

[Yeray]

Hi Janne,

I'm sorry for the late reply here. We're studying what changed and what's the best way to go we can suggest you.

[Yeray]

Hi Janne,

I'm sorry for the late reply here. We're studying what changed and what's the best way to go we can suggest you.

We've just corrected it.
Since the fix is simple and you are a source code customer, we can tell you the changes to apply. At TeeAntiAlias.pas you'll find the BlendColor (in your case it may be BlendColor1):

Code: Select all

procedure TAntiAliasCanvas.BlendColor(const AX,AY:Integer; const Dist:Single);

At the beginning of this function you'll find this:

Code: Select all

      if IFilter.RGBA then
      {$R-}
      with IFilter.LinesRGBA[AY,AX] do
      {$IFDEF WASRANGE}
      {$R+}
      {$ENDIF}
      begin
        // BGR
        Red:=Round(Dist*(Red-r))    + r;
        Green:=Round(Dist*(Green-g))+ g;
        Blue:=Round(Dist*(Blue-b))  + b;
      end

Modify the above for this:

Code: Select all

      if IFilter.RGBA then
      {$R-}
      with IFilter.LinesRGBA[AY,AX] do
      {$IFDEF WASRANGE}
      {$R+}
      {$ENDIF}
      begin
        // BGR
        Red:=Round(Dist*(Red-b))    + b;
        Green:=Round(Dist*(Green-g))+ g;
        Blue:=Round(Dist*(Blue-r))  + r;
      end

[JES]

Hi,

great, now it works fine, thanks!

Janne