[SOLVED] Snap won't enable

[Coachz]

I have a project that I can't enable snap on. I'm sure I screwed something up but have no idea where to look. Very odd.

[Coachz]

I deleted every track and snap still can't be enabled. I think this project is corrupted somehow or I have a wack setting. I have attached the project. Thanks for any ideas as we are laying guitar work and it's really hard to copy sections without snap. I saved it as a new project but no change.

[Coachz]

I opened a new project tab and copied all the tracks to a new project with no problem and the snap works so that's a fix ! yay

[Coachz]

That's 2 projects today that lost the ability to snap and I had to copy the entire project into a new project. Can a dev please checkout my attached project to tell me what happened please.

[Pink Wool]

Could it have something to do with the tempo map? I can confirm the snapping not working on your project file.

[Coachz]

Originally Posted by Pink Wool

Could it have something to do with the tempo map? I can confirm the snapping not working on your project file.

Thanks for the reply. On the master track I deleted the tempo and saved/reopened the project but I still have no snap. It's got me stumped.

[karbomusic]

Your snap/grid settings has most everything unchecked (right click the snap button in toolbar). Open another project that works, screenshot the snap/grid settings and compare to this project.

[Coachz]

karbomusic, you fixed it. I have some code that does things with snap that must be doing more than I though. Thanks VERY much. These are my normal snap settings

[Coachz]

So what code do I need to enable grid lines ? I'm not getting how config variables work.

-- enable grid lines
retval = reaper.SNM_SetIntConfigVar( "projshowgrid", 1)


projshowgrid

Description:
Several Snap/Grid-Settings, as set in Snap/Grid Settings located in menu Options -> Snap/grid -> Snap/grid settings
It is an integer-bitfield.

&1=0, Show grid, line spacing-checkbox(off) - unchecked
&1=1, Show grid, line spacing-checkbox(on) - checked

&2=0, Snap Media items to grid(off) - unchecked
&2=1, Snap Media items to grid(on) - checked

&4=0, Snap Cursor to grid(off) - unchecked
&4=1, Snap Cursor to grid(on) - checked

&8=0, Snap Selection to grid(off) - unchecked
&8=1, Snap Selection to grid(on) - checked

&16=0, Snap Media items to selection/markers/cursor(off) - unchecked
&16=1, Snap Media items to selection/markers/cursor(on) - checked

&32=0, Snap Cursor to selection/markers/cursor(off) - unchecked
&32=1, Snap Cursor to selection/markers/cursor(on) - checked

&64=0, Snap Selection to selection/markers/cursor(off) - unchecked
&64=1, Snap Selection to selection/markers/cursor(on) - checked

&128=0, Snap media items to nearby media items up to(off) - unchecked
&128=1, Snap media items to nearby media items up to(on) - checked

&256=0, Enable snapping(on) - checked
&256=1, Enable snapping(off) - unchecked

&512=0, Use the same grid division in arrange view and MIDI editor(also in MIDI Editor -> Options)(off) - unchecked
&512=1, Use the same grid division in arrange view and MIDI editor(also in MIDI Editor -> Options)(on) - checked

&1024=0, Snap to grid at any distance(off) - unchecked
&1024=1, Snap to grid at any distance(on) - checked

&2048 and &4096, Media items snap at-dropdownlist

0 0, Mouse-position dependent
1 0, Only snap at start/snap offset
0 1, Snap both start/end

&8192=0, Snap cursor to edges of media items on any track(off) - unchecked
&8192=1, Snap cursor to edges of media items on any track(on) - checked

&16384=0, unknown
&16384=1, unknown

&32768=0, Grid snap settings follow grid visibility(on) - checked
&32768=1, Grid snap settings follow grid visibility(off) - unchecked

&65536=0, unknown
&65536=1, unknown

&131072=0, Snap to project sample rate(off) - unchecked
&131072=1, Snap to project sample rate(on) - checked

[nofish]

Originally Posted by Coachz

So what code do I need to enable grid lines ? I'm not getting how config variables work.

-- enable grid lines
retval = reaper.SNM_SetIntConfigVar( "projshowgrid", 1)

That's it but you also need a

reaper.UpdateArrange()

to trigger a redraw.
(For a more detailed rundown about config vars see here.)

edit:
Nah, this is wrong sorry, as it turns all the other bits off.
This should be the one:

enableOK = reaper.SNM_SetIntConfigVar("projshowgrid", reaper.SNM_GetIntConfigVar("projshowgrid", -666)|1) -- bitwise OR, set bit

[Coachz]

Thanks so much. That code worked even without updating arrange but how did you get to that from this and why do you have to wrap SNM_GetIntConfigVar in SNM_GetIntConfigVar ? Thanks !!

&1=0, Show grid, line spacing-checkbox(off) - unchecked
&1=1, Show grid, line spacing-checkbox(on) - checked

[nofish]

You first get the current value of projshowgrid, then you set the first bit of it (that's what the '&1' in the doc is saying) to 1 (on) by bitwise ORing it with 1 (binary ...000001) because
0 OR 1 == 1 and
1 OR 1 == 1
so it's set to 1 no matter of the previous state (the other bits stay the same because 1 OR 0 == 1 and 0 OR 0 == 0).
https://en.wikipedia.org/wiki/Bitwise_operation#OR

Sorry, Wiki probably does a better job explaining than me..

[Coachz]

Originally Posted by nofish

You first get the current value of projshowgrid, then you set the first bit of it (that's what the '&1' in the doc is saying) to 1 (on) by bitwise ORing it with 1 (binary ...000001) because
0 OR 1 == 1 and
1 OR 1 == 1
so it's set to 1 no matter of the previous state (the other bits stay the same because 1 OR 0 == 1 and 0 OR 0 == 0).
https://en.wikipedia.org/wiki/Bitwise_operation#OR

Sorry, Wiki probably does a better job explaining than me..

I see. Thanks nofish for taking the time to help me out. Have a great day !

[Coachz]

Originally Posted by nofish

That's it but you also need a

reaper.UpdateArrange()

to trigger a redraw.
(For a more detailed rundown about config vars see here.)

edit:
Nah, this is wrong sorry, as it turns all the other bits off.
This should be the one:

enableOK = reaper.SNM_SetIntConfigVar("projshowgrid", reaper.SNM_GetIntConfigVar("projshowgrid", -666)|1) -- bitwise OR, set bit

So the -666 is the return value from getting and then you are ORing it with the one. And if you wanted to set another property you would OR it with whatever its associated value was like maybe 256 right?

[nofish]

Originally Posted by Coachz

So the -666 is the return value from getting and then you are ORing it with the one.

The -666 is just an arbitrarily chosen errvalue which is returned in case SNM_GetIntConfigVar() fails (see doc).
So a more non-lazy version of it would be:

-- enable show grid line spacing
projshowgridConfig = reaper.SNM_GetIntConfigVar("projshowgrid", -666)
if projshowgridConfig ~= -666 then -- got value ok, we can continue
  -- set 1st bit of projshowgridConfig to 1 (by bitwise ORing with 1)
  enableOK = reaper.SNM_SetIntConfigVar("projshowgrid", projshowgridConfig|1)
  -- may check if enableOK returned true...
end

And if you wanted to set another property you would OR it with whatever its associated value was like maybe 256 right?

In principle yes, but note that for Enable snapping the doc says:

&256=0, Enable snapping(on) - checked
&256=1, Enable snapping(off) - unchecked

So in this case you have to do a bitwise AND NOT for enabling snapping (clear the 9th bit):

-- enable snapping
projshowgridConfig = reaper.SNM_GetIntConfigVar("projshowgrid", -666)
if projshowgridConfig ~= -666 then -- got value ok, we can continue
  enableOK = reaper.SNM_SetIntConfigVar("projshowgrid", projshowgridConfig&(~256))
  -- may check if enableOK returned true...
end

or the lazy version:

enableOK = reaper.SNM_SetIntConfigVar("projshowgrid", (reaper.SNM_GetIntConfigVar("projshowgrid", -666)&(~256))) -- bitwise AND NOT, clear bit

[Coachz]

Very interesting and thank you for the information. So how do you know when you need to do an or or an and not?

[nofish]

OR for setting a bit (when it says &n=1 in the doc), AND NOT for clearing a bit (when it says &n=0 in the doc).

[Coachz]

Got it, thanks my friend