tachart nogui demo exeption
lazarus / 55-TAChart

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pacific2 · 2013-02-04 08:53

Dear all
I have just installed the 1.04 version under ubuntu. the compilation
of nogui demo works fine but I get the following exception when I try
to execute the program.

No other problems on lazarus, may be a linux miss configuration ?
anny idea?
Thanks in advance

[FORMS.PP] ExceptionOccurred
  Sender=FreeTypeException
  Exception=Font file "Arial.ttf" not found
  Stack trace:
  $0000000000802795
  $0000000000803FED
  $0000000000800D58
  $00000000004C521B line 254 of ../../tadrawerfpcanvas.pas
  $00000000006ACF06 line 492 of tatypes.pas
  $00000000006D9C98 line 721 of tatypes.pas
  $00000000006ADD62 line 586 of tatypes.pas
  $00000000006D8417 line 570 of tachartaxisutils.pas
  $000000000068D09F line 660 of tachartaxis.pas
  $000000000068F0B9 line 950 of tachartaxis.pas
  $00000000004BB1EA line 1184 of tagraph.pas
  $00000000004B83F7 line 765 of tagraph.pas
  $0000000000464918 line 39 of noguidemo.lpr
TApplication.HandleException Font file "Arial.ttf" not found
  Stack trace:
  $0000000000802795
  $0000000000803FED
  $0000000000800D58
  $00000000004C521B line 254 of ../../tadrawerfpcanvas.pas
  $00000000006ACF06 line 492 of tatypes.pas
  $00000000006D9C98 line 721 of tatypes.pas
  $00000000006ADD62 line 586 of tatypes.pas
  $00000000006D8417 line 570 of tachartaxisutils.pas
  $000000000068D09F line 660 of tachartaxis.pas
  $000000000068F0B9 line 950 of tachartaxis.pas
  $00000000004BB1EA line 1184 of tagraph.pas
  $00000000004B83F7 line 765 of tagraph.pas
  $0000000000464918 line 39 of noguidemo.lpr
exception at 0000000000802795:
Font file "Arial.ttf" not found.

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Ask · 2013-02-04 09:06

The demo requires font file, "Arial.ttf", which you should put in the
same directory as demo executable.

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pacific2 · 2013-02-04 09:58

Thanks for your rapid answer

Actually I have already tryed this solution but it appear that the
file Arial.ttf was empty (it seems thats there is several of such
files on ubuntu ???) Anyway I get a not empty file and I tryed again.
This time I get a new error type (see below). I conclude that all
Arial.ttf are not suitable. Can you please tell me where can I get the
good one.

[FORMS.PP] ExceptionOccurred
  Sender=FreeTypeException
  Exception=Error 6 while making string bitmaps step 4
  Stack trace:
  $00000000008017DE
  $000000000080186B
  $00000000008034BF
  $0000000000803CB0
  $000000000080124E
  $0000000000800EDE
  $00000000004B0FF2
  $00000000004AFB69
  $00000000004C5312 line 275 of ../../tadrawerfpcanvas.pas
  $00000000004C7B42 line 349 of tadrawutils.pas
  $00000000006ADD8E line 587 of tatypes.pas
  $00000000006D8417 line 570 of tachartaxisutils.pas
  $000000000068D09F line 660 of tachartaxis.pas
  $000000000068F0B9 line 950 of tachartaxis.pas
  $00000000004BB1EA line 1184 of tagraph.pas
  $00000000004B83F7 line 765 of tagraph.pas
  $0000000000464918 line 39 of noguidemo.lpr
TApplication.HandleException Error 6 while making string bitmaps step
4
  Stack trace:
  $00000000008017DE
  $000000000080186B
  $00000000008034BF
  $0000000000803CB0
  $000000000080124E
  $0000000000800EDE
  $00000000004B0FF2
  $00000000004AFB69
  $00000000004C5312 line 275 of ../../tadrawerfpcanvas.pas
  $00000000004C7B42 line 349 of tadrawutils.pas
  $00000000006ADD8E line 587 of tatypes.pas
  $00000000006D8417 line 570 of tachartaxisutils.pas
  $000000000068D09F line 660 of tachartaxis.pas
  $000000000068F0B9 line 950 of tachartaxis.pas
  $00000000004BB1EA line 1184 of tagraph.pas
  $00000000004B83F7 line 765 of tagraph.pas
  $0000000000464918 line 39 of noguidemo.lpr
exception at 00000000008017DE:
Error 6 while making string bitmaps step 4.

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Ask · 2013-02-04 12:21

I am not sure how to help here -- I am on Windows,
and both system font file and random file found with Google worked for
me.

Anyway, it is planned in the nearest future to use LazFreeType
librsary for Nogui chart,
which should at least be easier to debug.

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pacific2 · 2013-02-04 18:36

thank you Asck

I tried to see where occurs the error.

if I put under comment the following line, the png file is generated
but with a black picture

chart.Draw(d, Rect(0, 0, chart.Width, chart.Height));

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Ask · 2013-02-05 00:26

This is to be expected -- chart.Draw procedure draws the chart, so is
you comment it out, nothing happens.

Please post your version of ttf file, so I can try it.

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pacific2 · 2013-02-05 09:42

here is 2 examples of font I tried with no success. I also triad an
other arial font but it was too big (>700ko) to put it in the post
attachement.
good luck ;-)

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Ask · 2013-02-05 10:10

Both fonts worked for me on Windows (although the Times font is
unreadable at such a small size).

Perhaps update your FreeType?
Alternatively, see this topic.

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pacific2 · 2013-02-05 11:59

the freetype seems to be uptodate. Furthermore, the following program
works fine, font are corectly displayed. I will see the the discussion
on TBGRABitmap + NoGUI

http://wiki.freepascal.org/Developing_with_Graphics#Drawing_text_with_
sharp_edges_.28non_antialiased.29

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Ask · 2013-02-05 12:58

This programs uses widgetset font drawing procedures, not freetype
directly.

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pacific2 · 2013-02-05 14:40

A possible sub optimal solution (that works for my purpose) could be
to delete the orientation indications
I comment the following lines:
 d.DoGetFontOrientation  := @CanvasGetFontOrientationFunc;
-> no more errors at the execution but le left axis is not clean

I delete the following in order to have a bit clearer left axis
chart.LeftAxis.Marks.Frame.Style := psSolid;