Arrows at intersection in TikZ

I want to have the arrow tips on the intersection between the rectangle and the lines. Here I've got a M(N)WE:

documentclass[border=5pt,tikz]standalone usetikzlibraryintersections begindocument begintikzpicture clip[draw] (0,0) rectangle (3,3); path[name path=a] (0,0) rectangle (3,3); % draw[name path=b] (1.5,1.5) --+ (-2,2); % path[name intersections=of=a and b,by=s]; % node[fill=red,circle,inner sep=1pt] at (s) ; foreach x in 0,10,...,350 draw[name path=x,shift=(1.5,1.5)] (0,0) -- (x:2); % pgfmathsetmacrobx path[name intersections=of=x and a,by=sx]; endtikzpicture enddocument

Of course I could manually type the intersetions, but can I use the comman in a foreach loop, too?

foreach loop

+1 but please wrap the x in braces such that it compiles: path[name intersections=of=x and a,by=sx]; otherwise the space after x gets eaten and TikZ does not see the and.
– marmot
Aug 24 at 17:27

x

path[name intersections=of=x and a,by=sx];

x

and

@marmot Alternative: of=a and x, so you don't need these ugly braces ;)
– TeXnician
Aug 24 at 17:28

of=a and x

@TeXnician: Oh God, thank you! xD
– current_user
Aug 24 at 17:30

3 Answers
3

I usually name paths in such a way that they do not end with a macro. That way I am save if I compute the intersection between two paths with a macro.

documentclass[border=5pt,tikz]standalone usetikzlibraryintersections begindocument begintikzpicture clip[draw] (0,0) rectangle (3,3); path[name path=a] (0,0) rectangle (3,3); draw[name path=b] (1.5,1.5) --+ (-2,2); path[name intersections=of=a and b,by=s]; node[fill=red,circle,inner sep=1pt] at (s) ; foreach x in 0,10,...,350 draw[name path=x-path,shift=(1.5,1.5)] (0,0) -- (x:2); % pgfmathsetmacrobx path[name intersections=of=x-path and a,by=sx]; endtikzpicture enddocument

Without any intersections:

documentclass[border=5pt,tikz]standalone begindocument begintikzpicture draw (0,0) rectangle (3,3); foreach rot in 0,90,180,270 foreach x in -40,-30,...,40 draw[->] (1.5,1.5) --++([rotate=rot]x : 1.5/cos(x)); endtikzpicture enddocument

enter image description here

Arrows touching the right side of the rectangle can be easily drawn as draw[->] (1.5,1.5) --++(x : 1.5/cos(x)), where each arrow at angle x has length 1.5/cos(x). Then, we should repeat this for the remaining upper, left, and bottom sides of the rectangle, the outer foreach loop does this by rotating arrows at the respective angles.

draw[->] (1.5,1.5) --++(x : 1.5/cos(x))

x

1.5/cos(x)

foreach

You can try the following (switch a and x):

a

x

intersections

documentclass[border=5pt,tikz]standalone usetikzlibraryintersections begindocument begintikzpicture clip[draw] (0,0) rectangle (3,3); path[name path=a] (0,0) rectangle (3,3); % draw[name path=b] (1.5,1.5) --+ (-2,2); % path[name intersections=of=a and b,by=s]; % node[fill=red,circle,inner sep=1pt] at (s) ; foreach x in 0,10,...,350 draw[name path=x,shift=(1.5,1.5)] (0,0) -- (x:2); % pgfmathsetmacrobx path[name intersections=of=a and x, by=sx]; draw[->] (1.5,1.5)-- (sx); endtikzpicture enddocument

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

搜尋此網誌

Dfyjkt