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Re: gEDA-user: Error in Centroid Calculation
Hi John,
In my git-ified pcb repo I have:
<quote>
Author: danmc <danmc>
Date: 01/03/2008 12:45:12 AM
Parent: change the preprocessor logic a bit to avoid #ifdef-ing i...
Child: apply patch 1852864 GTK HID: scrolled layer preferences
Branch: master (Display nets as a hierarchical tree in the netlist
window.) origin (Display nets as a hierarchical tree in the netlist
window.)
Branch: pcb-20080202 (set version for 20080202 release)
Follows: pcb-20070912-base (news for 20070912)
Precedes: pcb-20080202-base (update for 20080202)
Fix a problem with the X-Y output file where the y values were mirrored
and offset with respect to the RS274-X output. Given that this bug has
been here since the code was written 3 years ago, I conclude that in
fact no one has used this feature.
</quote>
also look at:
http://archives.seul.org/geda/user/Jan-2008/msg00016.html
Kind regards,
Bert Timmerman.
On Mon, 2008-09-29 at 13:04 -0400, John Luciani wrote:
> IIRC board coordinates are measured from the upper left
> so board size should have no affect on the centroid coordinates
> within my board.
>
> If I center the crosshair in the center of the 0805 (which is the
> centroid for this package) both versions of PCB display
> the value (700,325). When the xy data is output the two versions
> differ.
>
> (* jcl *)
>
> On Mon, Sep 29, 2008 at 12:04 PM, Bert Timmerman
> <bert.timmerman@xxxxxxxxx> wrote:
> > Hmm, let's do some math:
> >
> > Board size: Xpcb = 184200, Ypcb = 85400 [mil/100].
> >
> > C1 is on: Xcomp = 700, Ycomp = 325 [mil]
> >
> > Centroid XY coords: X = Xcomp, Y = Ypcb - Ycomp = 854 -325 = 529 [mil]
> >
> > Hmm, version 20080202 looks good to me.
> >
> > Where are your origins ?
> >
> > IIRC, Dan did explain this one (and complain about nobody using this
> > feature, since he found it was buggy for years !).
> >
> > Kind regards,
> >
> > Bert Timmerman.
> >
> > On Mon, 2008-09-29 at 09:13 -0400, John Luciani wrote:
> >> There appears to be an error in the centroid calculation in
> >> pcb-20080202. If I load the pcb (below) in version pcb-20050315 and
> >> output the xy data I get
> >>
> >> C1,"0805","0.1u",700.00,325.00,0,bottom
> >>
> >> when I output xy data with pcb-20080202 (both lesstif and gtk)
> >> I get
> >>
> >> C1,"0805","0.1u",700.00,529.00,0,bottom
> >>
> >> For this footprint the mark is set at the centroid. (700,325) is
> >> correct.
> >>
> >> (* jcl *)
> >>
> >> #-------- pcb example -----------
> >>
> >> # release: pcb-bin 20050315
> >> # date: Mon Sep 29 08:04:13 2008
> >> # user: jluciani (jluciani)
> >> # host: rossini.luciani-family.org
> >>
> >> PCB["" 184200 85400]
> >>
> >> Grid[2500.00000000 0 0 1]
> >> Cursor[171354 117519 2.391741]
> >> Thermal[0.500000]
> >> DRC[749 10 800 800]
> >> Flags(0x00000000000018d8)
> >> Groups("1,c:2,s:3:4:5:6:7:8")
> >> Styles["Signal,1200,3800,2000,1000:Power,2500,6500,4600,1000:Fat,5000,7500,5200,1000:Skinny,900,3200,1600,1000"]
> >>
> >> Element[0x00000080 "0805" "C1" "0.1u" 70000 32500 14799 -2421 2 100 0x00000080]
> >> (
> >> Pad[-3740 -393 -3740 393 5118 2000 6118 "input" "1" 0x00000180]
> >> Pad[3740 -393 3740 393 5118 2000 6118 "input" "2" 0x00000180]
> >> ElementLine [-7799 -4452 7799 -4452 1000]
> >> ElementLine [7799 -4452 7799 4452 1000]
> >> ElementLine [-7799 4452 7799 4452 1000]
> >> ElementLine [-7799 -4452 -7799 4452 1000]
> >>
> >> )
> >>
> >> Layer(1 "component")
> >> (
> >> )
> >> Layer(2 "solder")
> >> (
> >> )
> >> Layer(3 "3")
> >> (
> >> )
> >> Layer(4 "4")
> >> (
> >> )
> >> Layer(5 "5")
> >> (
> >> )
> >> Layer(6 "6")
> >> (
> >> )
> >> Layer(7 "7")
> >> (
> >> )
> >> Layer(8 "outline")
> >> (
> >> )
> >> Layer(9 "silk")
> >> (
> >> )
> >> Layer(10 "silk")
> >> (
> >> )
> >> NetList()
> >> (
> >> )
> >>
> >>
> >
> >
> >
> > _______________________________________________
> > geda-user mailing list
> > geda-user@xxxxxxxxxxxxxx
> > http://www.seul.org/cgi-bin/mailman/listinfo/geda-user
> >
>
>
>
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