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Compass function 8 posts, 2 escritores, 9 lectores, inició hace 50 meses

publicado hace 50 meses (Wednesday, February 5) por jne4sl
#1
I find that compass() is prone to causing system errors without explanation.  It seems to me that there are some inconsistencies if the call includes referenced points.  If I go back and give each point referenced an explicit name, the system error will go away.  In particular, a radius I specify is likely to be the length of some other object or the distance between two points [p1:p2].l, so that may be what does it.  But I don't get a syntax error, just a system error.  (I haven't tried to replicate the problem in a small program, but I've bumped up against it for a while now.)

publicado hace 50 meses (Wednesday, February 5) por jne4sl
#2
Actually scratch that, it's when the points are a reference that there's a problem.  E.g.:

p1 = point(0,0)
p2 = point(10,0)
p3 = point(15,10)
l1 = [p1:p2]
l2 = [p1:p3]

   p4 = compass(p1,     [p1:p2].l, p3,     [p1:p3].l/2)
//p4 = compass(l1.p1, [p1:p2].l, p3,     [p1:p3].l/2)  
//p4 = compass(p1,     [p1:p2].l, l2.p2, [p1:p3].l/2)

I'd expect the last three lines to all do the same thing, but only the first works.  The second causes a system error, the third NaN.

publicado hace 50 meses (Thursday, February 6) por Sewist
#3
The syntax l1 = [p1:p2] is not actually documented.

It should be l1=line(p1,p2) and then you can refer to p1 as l1.p1

p1 = point(0,0)
p2 = point(10,0)
p3 = point(15,10)
l1 = line(p1,p2)
l2 = line(p1,p3)

p4 = compass(p1,     [p1:p2].l, p3,     [p1:p3].l/2)

doesn't return a system error. 



publicado hace 50 meses (Thursday, February 6) por jne4sl
#4
Ah, okay, that didn't occur to me, something to look out for.  I mostly use [p1:p2] in references, but I must use it carelessly instead of line(p1,p2) all the time. 

publicado hace 50 meses (Thursday, February 6) por jne4sl
#5
I went back and changed the definitions of l1 and l2 to use line(), but I'm still getting errors.  Maybe it's an abuse of notation, but most functions can take explicit points or referenced points.  Checking a little more, I find a problem with Compass() and Intercept().  The other ones I tried work the way I expect.  The lines that are commented out cause errors, or mistakes, but I think they should work, e.g. the three lines should create the same p4, or the same p7.

p1 = point(0,0)
p2 = point(10,0)

p3 = point(15,10)
l1 = line(p1,p2)
l2 = line(p1,p3)
p4 = compass(p1,[p1:p2].l,p3,[p1:p3].l/2)
//p4 = compass(l1.p1,[p1:p2].l,p3,[p1:p3].l/2)
//p4 = compass(p1,[p1:p2].l,l2.p2,[p1:p3].l/2)
p5 = apply(p1,l1.l,l2.a1)
p5 = apply(l1.p1,l1.l,l2.a1)
a1 = arc(p1,p3,[p1:p4].a1,[p4:p3].a2)
a1 = arc(l2.p1,l2.p2,[l1.p1:p4].a1,[p4:l2.p2].a2)
p6 = meet(p1,l2.a1+5,p3,l2.a2-15)
p6 = meet(l2.p1,l2.a1+5,l2.p2,l2.a2-15)
p7 = intercept(p1,l1.l/2,p3,l2.a2,1)
//p7 = intercept(l2.p1,l1.l/2,p3,l2.a2,1)
//p7 = intercept(p1,l1.l/2,l2.p2,l2.a2,1)
p8 = adjacent(p1, p3, [p1:p3].l/5, 2)
p8 = adjacent(l2.p1,l2.p2, [p1:p3].l/5, 2)
p9 = midpoint(p1,p2)
p9 = midpoint(l1.p1,l1.p2)
Este post tiene respuestas: ( #7 )

publicado hace 50 meses (Friday, February 7) por Sewist
#6
Thanks, I reported it to IT and they are looking into it!

Este post es la respuesta a #5
publicado hace 50 meses (Friday, February 7) por Sewist
#7
The IT just released a fix, could you please check if it's ok now?

publicado hace 50 meses (Friday, February 7) por jne4sl
#8
Thanks, it works!