Get Curve parameters
Note that functions returns the tables starting with index 0 contrary to LUA's usual index starting with 1
@status current Introduced in 2.0.12
curve
(unsigned number) curve number (use 0 for Curve1)
nil
requested curve does not exist
table
curve data:
name
(string) name
type
(number) type
smooth
(boolean) smooth
points
(number) number of points
y
(table) table of Y values:
key
is point number (zero based)
value
is y value
x
(table) only included for custom curve type:
key
is point number (zero based)
value
is x value