[PD] [datastruct] calculations inside drawing instructions
xaero at inwind.it
Sat Apr 9 01:48:08 CEST 2005
>Perhaps you want to compare your solution to the datastruct adsr
>envelope which is in Frank Barknecht s data structures tutorial:
>it s file 18-tut.pd, and you have to have grob-library.pd open
i looked at that patch, but it is not so good... really it allows you to
set more parameters than needed.
for now i got working a representation of A,D,S,R values with datastruct:
but this task is pretty useless. the useful part of datastructures is
that the user manipulate the vector *directly*.
but it is a harder work to let the user modify the adsr graph and keep
the structure "tidy" (for tidy i mean: when the user drag the attack
time, the patch has to set
and so on...)
here i notice the absence of separation between model's data and view's
data (did you ever hear about MVC concept?).
practically: the view part (V) shows some values, but the model part (M)
keep other values. in addiction: the V part translate user input (on
itself) into values suitable for data, and viceversa, when model's data
changes, the view updates itself.
if [drawpolygon] (and other drawing instructions) could (should!) do
calculations inside them, this part would be done automagically.
just for a structure like this, it is a pain in the ass maintain M and V
in sync. (i can't still make a full working example). imagine yourself
what could happen with a more complex structure.
in addition, having model separate from view, allows you to have many
views that belongs to one data-structure, and this is good.
sorry if the tone of my post sounds surly, it is not my intention.
i think my english is not so good too :)
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