Hi, I’ve recently taken to mucking around with the pattern effect column. So wrote this:
function delete_effect_column()
local s=renoise.song()
local currTrak = s.selected_track_index
local currPatt = s.selected_pattern_index
local reksult = s.selected_pattern.number_of_lines
for i=1,8 do
for s=1,reksult do
renoise.song().patterns[currPatt].tracks[currTrak].lines[s].effect_columns[i].number_value=00
renoise.song().patterns[currPatt].tracks[currTrak].lines[s].effect_columns[i].amount_value=00
end
end
end
renoise.tool():add_keybinding {name = "Global:Paketti:Delete effectcolumn content from current track", invoke = function() delete_effect_column() end }
It wipes all the effect_column contents for the 8 effect_columns, no matter if they’re shown or not. But it does it sslloowwllyy. I’m wondering how this could be optimized?
Hi, I can think of two things that would ensure better performance:
Use a pattern iterator for looping through lines. There are many different iterators to choose from, but for this purpose the “effect_columns_in_pattern_track” would be the one to go with.
Use API methods for clearing the line / checking if the line needs to be cleared
So your example could become like this:
local s = renoise.song()
local track_index = s.selected_track_index
local patt_index = s.selected_pattern_index
local iter = renoise.song().pattern_iterator:effect_columns_in_pattern_track(patt_index,track_index)
for _,line in iter do
if not line.is_empty then
line:clear()
end
end
These were amazing suggestions. Thank you very much. This makes me believe that if examples like this can be called from the pattern_iterator, that I’ll be able to use these bits of code from you to learn what other functions the pattern_iterator can have. cheers!
Well, there isn’t much to them really, they just represent different ways of looping through the song/pattern/track/columns.
In essence, they can be more efficient than a manual loop, but in practice it really depends on what you want to achieve. For instance, it wouldn’t be very clever to use a pattern iterator if we just wanted to change a single line!!
I suspect the real time-saver in the example above is the check for whether the line is empty, and the use of the clear() command.
