[Mapserver-users] R: R: I: R: Aesthetics with label

[Ballini Yvain]

Yes,
I'm using antialiasing but the distortion of the characters remains the same.
Of course, it isn't a high priority but I'm quite surprised that nobody has let some message on the mailing list about it.
Indeed, this is a limit that can become important for cartografic applications in which some performant labelling is requested.
Thanks a lot.
Yvain.
 

-----Messaggio originale-----
Da: Steve Lime [mailto:steve.lime at dnr.state.mn.us] 
Inviato: giovedì 26 febbraio 2004 1.01
A: Ballini Yvain
Oggetto: Re: R: I: R: Mathematical model applied to the option ANGLEAUTO

Aesthetics just aren't a high priority to many folks. It was better with Freetype 1 but the GD folks decided to drop that support and we followed suit. Are you using antialiasing?

Steve

>>> "Ballini Yvain" <Ballini.Yvain at seat.it> 02/24/04 1:45 AM >>>
Using some other font, indeed the situation changes but it remains a little distorted.
I'm actually using gd-2.0-15 and freetype-2.1.3 with mapserver 4.0 on Windows XP...but if it's due to the version, I don't understand why nobody has noticed it in the last months.
Thanks again.
Yvain.


-----Messaggio originale-----
Da: Steve Lime [mailto:steve.lime at dnr.state.mn.us]
Inviato: lunedì 23 febbraio 2004 21.26
A: Ballini Yvain
Oggetto: Re: I: R: Mathematical model applied to the option ANGLE AUTO

I guess I suggest trying a couple of things to troubleshoot this:

  - try another font, does the problem persist
  - make sure you are using the most recent versions of GD and Freetype

Steve

>>> "Ballini Yvain" <Ballini.Yvain at seat.it> 2/23/2004 11:33:00 AM >>>
 
Well, trying to fix an angle value for all the labels, I see that the problem of distortion remains, that shows that it isn't due to the option ANGLE AUTO (see Milano2.png).
 

-----Messaggio originale-----
Da: Ballini Yvain
Inviato: lunedì 23 febbraio 2004 18.17
A: 'steve.lime at dnr.state.mn.us'
Oggetto: I: R: Mathematical model applied to the option ANGLE AUTO

I'm looking at the file mapprimitive.c but I am not sure it is there that the angle is computed in my case.
In the unction bufferPolyline of mapprimitive.c, it seems like you said that only one value is calculated for all the points of the feature. How could you explain the "distorted" characters, that I get using this value?
Thanks again.
Yvain.

-----Messaggio originale-----
Da: Ballini Yvain
Inviato: lunedì 23 febbraio 2004 17.49
A: 'Steve Lime'
Oggetto: R: R: Mathematical model applied to the option ANGLE AUTO

Of course,
Here I send tou "Milano.png" which I'm getting with my application.
The distorsion is light but there is a distorsion for the labels of the streets (see for example "via F. Pecorari" under, or "via S. Paolo" above): not all the characters are aligned and that's not beautiful. If I fix a value for the angle, it doesn't give this problem but it doesn't follow of course the street'direction.
Are you sure that only 1 angle value is computered for each label feature? If yes, the problem would be due to a small change of the position value...?
Thanks !
Yvain.

-----Messaggio originale-----
Da: Steve Lime [mailto:steve.lime at dnr.state.mn.us]
Inviato: lunedì 23 febbraio 2004 17.40
A: Ballini Yvain
Oggetto: Re: R: Mathematical model applied to the option ANGLE AUTO

That's how it works now though, only 1 angle is computed. I suspect problems either with Freetype/GD or perhaps with the font you are using. Do you have a screen shot showing the distortion?

Steve

>>> "Ballini Yvain" <Ballini.Yvain at seat.it> 2/23/2004 10:38:23 AM >>>
Thanks for the answer.
I make this question because with my application, the angle which is given using the option ANGLE AUTO is ok, but it seems to recalculated for all the characters of the label (it gives me some distorted label when I'm applying it to a street layer). I would like to have only one angle value for each label feature, which would correspond to the average angle of the current segment of the street. I dont't know if I'm clear with my english...! :) Bye.
Yvain.

-----Messaggio originale-----
Da: Steve Lime [mailto:steve.lime at dnr.state.mn.us]
Inviato: lunedì 23 febbraio 2004 17.32
A: Ballini Yvain
Oggetto: Re: Mathematical model applied to the option ANGLE AUTO

Hi there: I guess I'm confused by your email. The angle is computed on a label-by-label basis (i.e. for all characters) already. The code is in mapprimitive.c...

Steve

>>> "Ballini Yvain" <Ballini.Yvain at seat.it> 2/23/2004 8:29:43 AM >>>

Hi Steve,

I've seen that you are a kind of "guru" of mapserver. I would like to modify something about the mathematical model applied to the option ANGLE AUTO for the labels in mapserver 4.0.
I would like to do the calculation of the angle only once for each label and not for all character like it semms to be made in the current version. Could you indicate me where I should look for this part in the source?
Thanks a lot.
Best reagrs.
Yvain Ballini.