Re: gEDA-user: Error in Centroid Calculation

[Bert Timmerman <bert.timmerman@xxxxxxxxx>]

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()
> (
> )
> 
> 



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