How do we calculate length & width of an arc custom shape, or get the mid point of an arc.

Hi Dave, all

I have an issue on getting custom shapes size from a padstack. Some shapes which has arcs gives a rounded value if we use a bounding box. Example if the shape Bbox is(-0.362 -0.572)(0.362 0.572) , if we measure length & width in custom shape it sometimes can be 0.5715 instead of 0.572(rounded). I have raised to cadence & they have provided me with a code which i worked on. Attach is the code. When i asked cadence how do i get the length & width, the advice that  the min x can be subtracted from the max to obtain the width.The same can be done for the height using the y values. Below is the modified code that i manage to do.I still see issues when ever i see a half moon shape with arcs. If i can get the mid point of every arcs then i might solve this issue, unless you can suggest a better way. Please help & advice. Attach also snap shots of the results & shapes that i see which does not gives correct results.

Thanks

Jerry

From Cadence

defun( _TEST_getTopPadData (pin_dbid)
prog( ( pad_id xy cw acp wdth)
pad_id = axlDBGetPad( pid "PIN/TOP" "REGULAR")
axlMsgPut("Pad shape name: %s" pad_id->name)
axlMsgPut("Bounding Box: %L" pad_id->bBox)
fig_id= car(pad_id->figure)
pth_seg_list = axlPathGetPathSegs(fig_id)
seg_number = 1
foreach(seg pth_seg_list
xy = seg->_endPoint
if( seg->_arcClockwise then
cw = "Clockwise"
else
cw ="Counter_clockwise"
)
if( seg->_arcCenter then
acp=seg->_arcCenter
else
acp=list("Line")
)
wdth = seg->_width
if( acp=seg->_arcCenter then
axlMsgPut( "Seg No: %d Arc EndPoint: %L Arc Dir: %s Arc Center: %L Width:%f"
seg_number
xy
cw
acp
wdth
)
else
axlMsgPut( "Seg No: %d Line EndPoint: %L Width: %f" seg_number xy wdth)
)
seg_number++
)

return(nil)
))

Modified

defun( _TEST ()

axlVisibleDesign(nil)
axlVisibleLayer("PIN/TOP" t)
axlSetFindFilter(?enabled list("noall" "pins" "text") ?onButtons list("noall" "pins" "text"))
axlSetFindFilter(?enabled '(noall pins text) ?onButtons '(pins text))
np=axlAddSelectAll()
pin_dbid=car(axlGetSelSet(np))

list_x=nil
list_y=nil
list_1=nil

prog( ( pad_id xy cw acp wdth acp2 rad )
pad_id = axlDBGetPad( pin_dbid "PIN/TOP" "REGULAR")
axlMsgPut("Pad shape name: %s" pad_id->name)
axlMsgPut("Bounding Box: %L" pad_id->bBox)
fig_id= car(pad_id->figure)
pth_seg_list = axlPathGetPathSegs(fig_id)
seg_number = 0
foreach(seg pth_seg_list
xy = seg->_endPoint
if( seg->_arcClockwise then
cw = "Clockwise"
else
cw ="Counter_clockwise"
)
if( seg->_arcCenter then
acp=seg->_arcCenter
acp2=seg->startEnd
rad=seg->radius
else
acp=list("Line")
)
wdth = seg->_width
mid=axlMidPointArc(acp2 acp rad width t)
if( acp=seg->_arcCenter then
axlMsgPut( "Seg No: %d Arc EndPoint: %L Arc Dir: %s Arc Center: %L Width:%f"
seg_number
xy
cw
acp
wdth
)


else
axlMsgPut( "Seg No: %d Line EndPoint: %L Width: %f" seg_number xy wdth)
)
seg_number++
p_o=list(xy)
xpo=caar(p_o)
ypo=cadar(p_o)
list_x=cons(xpo list_x)
list_y=cons(ypo list_y)



;axlMsgPut("list_sx: %L" listx)
;axlMsgPut("list_sy: %L" listy)
;axlMsgPut("list_minx: %L" xmin)
;axlMsgPut("list_maxx: %L" xmax)



)

;listpts=reverse(list_x)
listx=sort(list_x 'lessp)
listy=sort(list_y 'lessp)

lx=length(listx)
ly=length(listy)

xmi=nthelem(1 listx)
xmx=nthelem(lx listx)

ymi=nthelem(1 listy)
ymx=nthelem(ly listy)


x_wid=abs(xmx-xmi)

y_hgt=abs(ymx-ymi)


axlMsgPut("list_x: %L" listx)
axlMsgPut("list_y: %L" listy)

axlMsgPut("x: %.3f" x_wid)
axlMsgPut("y: %.3f" y_hgt)



return(nil)
)
)

2350.custom_shape_error.docx