Em sex., 1 de abr. de 2022 às 13:46, Miller Puckette <msp@ucsd.edu> escreveu:

Because when just making a patch the origin is conventionally top left,
not bottom left.  So pixels count downward, and if you want "y" to increase
as you go up, that's the opposite dorection.

Sure, but let me see if I get things straight. This is just meaningful for Data Structures, right? Cause if I change this in a "regular" canvas, I don't see any difference. But maybe I'm missing something.

all the "units per pixel" values only affect data structure scalars.

Now, I can see the difference is where to consider the origin (0/0 coordinate), but I don't know what's the benefit besides maybe having a more intuitive expectation when resizing the window, right? Perhaps one could argue it also makes easier to know where to append objects on the canvas, but I'm not sure about that.

Anyway, I really think it makes it very confusing for setting and retrieving field values that represent the horizontal axis. In the Data Structures tutorial examples, like 02.getting.data, the height of the triangle is a negative number. This is particularly troublesome for arrays, cause we really expect that the higher the element is, the higher its value should be.

 

Just install a mirror on your desktop and look at your screen downward
through it, and you'll see 'y' increase upward when 'scale' is set to 1 :)

Not sure if that fixes everything and this can be easily fixed by setting the "Y units per pixel" value to a positive number, like in the 07.sequencer examples, which, by the way, makes much more sense to follow the score.

I'm now revising the Data Structures tutorial in my documentation updates and would like to bring this discussion into attention. I have changed all the patches so the "Y" unit is set to positive values and have better documented how this works. But anyway, I really think it makes more sense for a default value that we have Y units set to "1".

the problem is that when making new patches where height plays a role, unless you know the limits for your height and set your window accordingly, you'll always have to play around with the vertical slider for it to display correctly. Also, I think I remember display errors in the windows when opening them, even if the canvas was saved with enough height; readjusting minimally the canvas height fixes it.

Unless that a window slider control method would be added to pdcontrol to complement such issues, which would anyway be a good idea - it would allow for lots of new GUI possibilities.

Joao