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%pl[link=lines,width=1] vs. %pl[link=lines,width=3]

 
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Kenneth_Smith



Joined: 18 May 2012
Posts: 828
Location: Lanarkshire, Scotland.
PostPosted: Mon Jul 28, 2025 3:35 pm    Post subject: %pl[link=lines,width=1] vs. %pl[link=lines,width=3] Reply with quote
In the following program two %pl graphs are used to plot identical data.

The data is an impulse function � zero everywhere but at one point where is it 10 units.

The first %pl with %pl[WIDTH=1] draws the expected graph. In the second %pl with %pl[WIDTH=3] the graph overshoots the desired magnitude of the impulse (by far more than 3 pixels).

Please see the annotated graphic below:
https://www.dropbox.com/scl/fi/5vk4iin61argojqmkhfgq/Screenshot-2025-07-28-150549.jpg?rlkey=5zlx6vqrapgc6h4mkdjaictml&st=6cpbqh0l&dl=0

For both %pl graphs the link option is set to LINES, so this should not be related to the default �TENSION� setting.

If the parameter N (number of data points) is reduced from 200 to 20, this does not occur.

I am using the 22nd June FTN95 and DLLs.

Sorry Paul, I broke %pl again!


Code:
program test_pl
use clrwin
implicit none
integer, parameter :: n = 200  !## Change n to 20 and everthing is OK
integer :: i, iw
real*8 :: x(n), y(n)

do i = 1, n
  x(i) = i
end do
y = 0.d0
y(n/2) = 10.d0  ! Magnitude 10 impulse at one time instant

print*, 'min/max y = ', minval(y), maxval(y)

! This graph is drawn correctly
call winop@('%pl[native,n_graphs=1,x_array,link=lines,gridlines,y_min=0,y_max=12,symbol=10]')
call winop@('%pl[width=1]')   !###
call winop@('%pl[Title="This graph is correct with width=1"]')
iw = winio@('%pl&',900,300,n,x,y)

! This graph has a problem
call winop@('%pl[native,n_graphs=1,x_array,link=lines,gridlines,y_min=0,y_max=12,symbol=10]')
call winop@('%pl[width=3]')   !### only difference between the configuration of the two %pl graphs
call winop@('%pl[Title="This graph is not correct with width=3"]')
iw = winio@('%ff%pl&',900,300,n,x,y)
iw = winio@('')

end program test_pl
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PaulLaidler
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Joined: 21 Feb 2005
Posts: 8235
Location: Salford, UK
PostPosted: Mon Jul 28, 2025 5:18 pm    Post subject: Reply with quote
Ken

Thank you for the feedback. I have logged this for investigation.
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PaulLaidler
Site Admin


Joined: 21 Feb 2005
Posts: 8235
Location: Salford, UK
PostPosted: Wed Aug 06, 2025 12:13 pm    Post subject: Reply with quote
Ken

This behaviour reflects a limitation of the Microsoft GDI+ library.
The plot values are correct on calling an API called GdipDrawLines.
I suspect that it is not a fault but simply a limitation relating to what you can draw when joining thick lines at a spike point.
It may be possible to apply a clipping rectangle but it would be messy.
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