Being new at this I ran into several problems. First some code:
import vmath
type
Seg = array[4, Vec2]
Segs = array[4, Seg]
Spline = tuple[t: seq[float32], xy: seq[Vec2], v: seq[Vec2], a:
seq[Vec2], lengt: seq[float32]]
proc bezier(segment: Seg, res: int): Spline =
#var t: seq[float32]
let
t1 = 1 / float32(res)
t2 = t1 * t1
t3 = t2 * t1
b0 = segment[0]
b1 = segment[1]
b2 = segment[2]
b3 = segment[3]
a = -b0 + 3 * b1 + -3 * b2 + b3
b = 3 * b0 + -6 * b1 + 3 * b2
c = -3 * b0 + 3 * b1
var
d = b0
fd1 = a * t3 + b * t2 + c * t1 #initial velocity
fd2 = 6 * a * t3 + 2 * b * t2 #initial acceleration
fd3 = 6 * a * t3 #acceleration change
seqt = @[float32(0.0)]
seqxy = @[d]
seqfd1 = @[fd1]
seqfd2 = @[fd2]
seqlen = @[length(d)]
for i in 1 .. res:
d += fd1
fd1 += fd2 #speed
fd2 += fd3 #acceleration
seqt.add(float32(i)*t1)
seqxy.add(d)
seqfd1.add(fd1)
seqfd2.add(fd2)
seqlen.add(length(d))
let spline: Spline = [t: seqt, xy: seqxy, v: seqfd1, a: seqfd2]
return spline
Run
Error: undeclared identifier t after uncomment t I get: Error: cannot evaluate
at compile time: t
Simple question, what to do.
Second question, in python I would use a dictionary to hold the several lists
and work directly with that. What would a suitable container be with Nim. I
tried tables (can't work with mixed type?), put it all in a seq (gets a bit
cumbersome) and tuples so far.
