[Mapserver-users] What is the resolution item on the map object?
Murilo Lacerda Yoshida
murilo.yoshida at agx.com.br
Fri Jun 18 14:29:30 PDT 2004
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Hi all,
I was reading the mapscale.c. In the calculateScale method it uses a
resolution member of the map object.
Then I looked at the mapfile documentation, it says that the
resolution member is used to calculate scales, and that its default is
72 pixels per inch.
I normally do not define this member in my map files.
Ok, so that means that all my scales are calculated by considering
that 1 inch equals 72 pixels?
If I use php/mapscript, should I refresh this member every time my
extents change so I get the actual scale?
I am a little confused about this.
Thanks,
Murilo
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<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> </span>Hi =
all,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> </span>I was reading the <span =
class=3DSpellE>mapscale.c</span>…
In the <span class=3DSpellE>calculateScale</span> method it uses a =
resolution member
of the map object…<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> </span>Then I looked at the <span =
class=3DSpellE>mapfile</span>
documentation, it says that the resolution member is used to calculate =
scales,
and that its default is 72 pixels per inch.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> </span>I normally do not define this =
member in
my map files.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> </span>Ok, so that means that all my =
scales are
calculated by considering that 1 inch equals 72 =
pixels?<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> </span>If I use php/<span =
class=3DSpellE>mapscript</span>,
should I refresh this member every time my extents change so I get the =
actual
scale?<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> </span>I am a little confused about =
this…<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> =
</span>Thanks,<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 face=3DArial><span lang=3DEN-US =
style=3D'font-size:
10.0pt;font-family:Arial;mso-ansi-language:EN-US'><span
style=3D'mso-spacerun:yes'> =
</span>Murilo<o:p></o:p></span></font></p>
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