Spurious triangles in Pie Chart's SVG Export

[IanK]

If you export a pie chart to a SVG file, as well as all the expected content it seems to include a set of random triangles too - sample available on request, as the forums don't allow them to be attached to posts.

To reproduce, just add a TChart to a new form, give this a pie chart series (with the initial set of random values), and do the export with a line of this form:

Code: Select all

VclTee.TeeSVGCanvas.TeeSaveToSVGFile(Chart1, 'C:\Test.svg', 500, 500) ;

Is a fix available for this?

As an aside, the call appears to ignore any values given to the optional third and forth parameters (which are width and height from their names). I haven't been able to find any documentation for this function, so it's not 100% clear how they're meant to be used - could you clarify, please?

[Yeray]

Hello,

If you export a pie chart to a SVG file, as well as all the expected content it seems to include a set of random triangles too - sample available on request, as the forums don't allow them to be attached to posts.

I've reproduced the problem in 2D (it works fine in 3D) so I've added it to the public tracker:
http://bugs.teechart.net/show_bug.cgi?id=1965

As an aside, the call appears to ignore any values given to the optional third and forth parameters (which are width and height from their names). I haven't been able to find any documentation for this function, so it's not 100% clear how they're meant to be used - could you clarify, please?

I've seen this problem seems to appear since we implemented the fix for #734. We are revising it and we'll be back to you asap.

Thanks for reporting both problems.

[Yeray]

As an aside, the call appears to ignore any values given to the optional third and forth parameters (which are width and height from their names). I haven't been able to find any documentation for this function, so it's not 100% clear how they're meant to be used - could you clarify, please?

I've seen this problem seems to appear since we implemented the fix for #734. We are revising it and we'll be back to you asap.

Fixed for the next maintenance release.

[IanK]

Thanks for the update Yeray, and for addressing the export size problem so promptly.

Regarding the triangles, the export I'm getting them on is a 3D one; I've had another go at attaching a sample file, this time with the extension changed to ".txt" (and then ".dat") to try to get past any blocked types, but in both cases they were disallowed too. Is there a safe extension I could use, or another way of getting the file to you?

Regards,
Ian

Hello,

If you export a pie chart to a SVG file, as well as all the expected content it seems to include a set of random triangles too - sample available on request, as the forums don't allow them to be attached to posts.

I've reproduced the problem in 2D (it works fine in 3D) so I've added it to the public tracker:
http://bugs.teechart.net/show_bug.cgi?id=1965

As an aside, the call appears to ignore any values given to the optional third and forth parameters (which are width and height from their names). I haven't been able to find any documentation for this function, so it's not 100% clear how they're meant to be used - could you clarify, please?

I've seen this problem seems to appear since we implemented the fix for #734. We are revising it and we'll be back to you asap.

Thanks for reporting both problems.

[IanK]

A further update on this; given that the .svg file is XML, and that's essentially text, I thought I'd get get sample through to you by posting it in the message body. Please see below.

Also, after some tentative poking around it turns out that the run of lines of the form:

Code: Select all

<polygon fill="rgb(160,160,160)" fill-opacity="0.5" stroke="none" ... />

are responsible for the triangles I reported; delete these and you get a clean chart (and that's something I can do in code, as a stopgap).

Hope this is of use!

.svg file contents follow:

Code: Select all

<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
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Sample&#32;Chart
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</text>
<rect  x="319" y="117"  width="8" height="8" fill="silver" fill-opacity="0.5"/>
<rect  x="319" y="117"  width="6" height="6" fill="rgb(179,8,14)" fill-opacity="1" stroke="black" stroke-opacity="1"/>
<text x="330" y="138" font-family="Verdana" font-size="8pt"  fill="black" fill-opacity="1">
398
</text>
<text x="355" y="138" font-family="Verdana" font-size="8pt"  fill="black" fill-opacity="1">
Chairs
</text>
<rect  x="319" y="130"  width="8" height="8" fill="silver" fill-opacity="0.5"/>
<rect  x="319" y="130"  width="6" height="6" fill="rgb(242,192,93)" fill-opacity="1" stroke="black" stroke-opacity="1"/>
</svg>

[Yeray]

Hello Ian,

Regarding the extensions allowed in this forum, note you should be able to put your .svg file in a .zip and attach it here.
Another alternative would be to open the .svg and make an screenshot to generate a .png and attach it here.

Regarding the wrong triangles, I've tested 3D several times and it always gives me a correct result, ie:

Code: Select all

uses Series, TeeSVGCanvas;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.AddSeries(TPieSeries).FillSampleValues;
  TeeSaveToSVGFile(Chart1, 'E:\tmp\exports\pie.svg', 500, 300);
end;

Screenshot of the .svg:

iexplore_2018-01-12_09-10-40.png (17.24 KiB) Viewed 16115 times

In your case, it seems only the shadow is messed up, and removing those polygons you are removing that shadow.

On the other hand, in 2D I always get a completely messed up chart. Actually, the shadow seems to be correct:

Code: Select all

uses Series, TeeSVGCanvas;

procedure TForm1.FormCreate(Sender: TObject);
begin
  Chart1.View3D:=False;
  Chart1.AddSeries(TPieSeries).FillSampleValues;

  TeeSaveToSVGFile(Chart1, 'E:\tmp\exports\pie.svg', 500, 300);
end;

Screenshot of the .svg:

iexplore_2018-01-12_09-14-44.png (30.87 KiB) Viewed 16125 times

[IanK]

Hello Ian,

Regarding the extensions allowed in this forum, note you should be able to put your .svg file in a .zip and attach it here.
Another alternative would be to open the .svg and make an screenshot to generate a .png and attach it here.

Regarding the wrong triangles, I've tested 3D several times and it always gives me a correct result, ie:

Hi Yeray,

Thanks for running those tests; FWIW I'm still repeatably getting the odd triangle/shadow behaviour here (I've checked, and I'm using the 2017.23 version of the code) - the attached project's what I'm using to generate it. (I tried attaching the built EXE, but that led to a ZIP exceeding the forum size limits.)

Regards,
Ian

[Yeray]

Hello Ian,

The fix just implemented for #1965 seems to fix the problem you are experiencing with the shadows.
In v2017.23 I get this with your project:

iexplore_2018-01-12_13-39-41.png (25.27 KiB) Viewed 16121 times

And I get this with the fix:

iexplore_2018-01-12_13-39-50.png (19.01 KiB) Viewed 16117 times

[IanK]

Hello Ian,

The fix just implemented for #1965 seems to fix the problem you are experiencing with the shadows.

Excellent - thanks for your help with this, Yeray!