Re: How to drow arrow in 3D space?
- To: mathgroup at smc.vnet.net
- Subject: [mg16716] Re: [mg16688] How to drow arrow in 3D space?
- From: BobHanlon at aol.com
- Date: Wed, 24 Mar 1999 02:23:40 -0500
- Sender: owner-wri-mathgroup at wolfram.com
In a message dated 3/20/99 7:40:31 AM, krupa at alpha.sggw.waw.pl writes:
>Arrow package draws arrows using point from 2D space.
>
>E.g.:
>A={1,3}
>B ={4,5}
>Show[Graphics[Arrow[A,B]]]
>
>but it does not work when
>A={1,2,4} and B={4,5,7}
>
>Is there any package which draws *color* arrows in that case?
>
Jan,
Needs["Graphics`Arrow`"];
arrowList = {
{{0, 0}, {.75, .25}},
{{.25, .75}, {.5, .75}},
{{.5, 1.75}, {.75, .9}},
{{.25, 1.2, .25}, {.25, .75}},
{{.2, .75}, {.5, .5, .5}},
{{.2, .5, .9}, {.75, .75, .5}}
};
Show[Graphics[Join[
{Hue[.6]},
Arrow[Sequence @@ #]& /@
(arrow2D = Select[arrowList,
((Length[#[[1]]] == 2) && (Length[#[[2]]] == 2))&]),
{Hue[0]},
Arrow[Sequence @@ #]& /@ Map[Take[#, 2]&,
Complement[arrowList, arrow2D], {2}]
]]];
Blue arrows are the two-dimensional arrows. The red arrows
are the projections of the three-dimensional arrows onto the
{x, y} plane.
Bob Hanlon