Box placement.

[honky]

Good morning,
I have horizontal lines every 20 pixels.
With Py = MouseY, I place a box. (which falls where I click: 132, 145, 157 ... ect ...)
I would like the box to be placed with a step of 10 pixels 130 140 150.
How to do ?
Thank you for.

[tsh73]

Have a look
nomainwin
open "Do some clicks" for graphics_nsb_nf as #gr
#gr "trapclose [quit]"
#gr "down"

#gr "home"
#gr "posxy cx cy"

for y = 20 to 2*cy step 20
   #gr "line ";0;" "; y;" "; 2*cx;" "; y
next

#gr "flush"
#gr "when leftButtonUp [draw]"
wait

[draw]
   ch=20
   cw=10
' MouseX; " "; MouseY
'ajust them to 10
   mx= 10*int(MouseX/10)
   my= 10*int(MouseY/10)
   #gr "place ";mx;" ";my
   #gr "\";mx;",";my
   #gr "place ";mx;" ";my
   #gr "box ";mx+cw*len(mx;",";my);" ";my-ch
wait

[quit]
   close #gr
end


[honky]

It's work fine.
Thank you tsh73

[flobert]

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[plus]

Fine tuned, stepping 20 and putting boxes between the lines.
nomainwin
open "Do some clicks" for graphics_nsb_nf as #gr
#gr "trapclose [quit]"
#gr "down"

#gr "home"
#gr "posxy cx cy"

for y = 20 to 2*cy step 20
   #gr "line ";0;" "; y;" "; 2*cx;" "; y
next

#gr "flush"
#gr "when leftButtonUp [draw]"
wait

[draw]
   ch=20
   cw=10
' MouseX; " "; MouseY
'ajust them to 10
   mx= 10*int(MouseX/10)
   my= 20*int(MouseY/20)+ 20
   #gr "place ";mx+12;" ";my-3
   #gr "\";mx;",";my
   #gr "place ";mx;" ";my+1
   #gr "box ";mx+cw*len(mx;",";my);" ";my-ch
wait

[quit]
   close #gr
end