For questions about calculating intersections using {tikz-pgf} or {pgfplots}, including PGF's `intersections` library.

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4
votes
1answer
348 views

Tikz: Drawing a line from a focus to the edge of an ellipse

This question is similar to Tikz: connecting two vectors from the focus of an ellipse to the edge but not the same. In this instance, I want the the length of line to be a specific distance. If ...
4
votes
1answer
1k views

Tikz: drawing a line to the edge of a circle

If I wanted to draw a line to the edge of a circle, I could simple do the following \pgfmathsetmacro{\a}{2} \draw (0, 0) circle (\a cm); \draw[-latex] (0, 0) -- ({\a * cos(angle)}, {\a * ...
7
votes
1answer
657 views

Tikz: placing a node at the intersection of two circles along a hyperbola

I know one can use the intersection package to find the point of intersection but I don't understand how to do it yet. I would like to label the increasing order of the intersections F^*_2, F^*_1, ...
9
votes
1answer
505 views

Drawing little semicircle to show that two intersecting lines are not connected [duplicate]

I want my diagram to show that two intersecting lines are not actually connected, but one passes above the other. The best result I would like to achieve would be a small semicircle as used in ...
2
votes
1answer
102 views

Problem numbering chapter, sections [duplicate]

I'm trying to write something in LaTeX, I would change the style of my paragraph numbering. I would have this: ** My PDF ** My Chapter I My section 1 My section 2 To do so, I put ...
5
votes
2answers
307 views

Highlighting intersections

I would like to highlight the region C in the Euler diagram below. I tried to play around with fill opacity command, but I was not able to highlight C alone. Should I use the intersections libraries ...
11
votes
2answers
1k views

Crossing paths in TikZ without intersection

Once again, I'm preparing a new logic puzzle; Resuko to be precise. For the race track, I would like to have a symbolized bridge/underbridge -|-. I searched this site, but only found this question: ...
5
votes
1answer
770 views

Right Angle Symbol Alignment with TikZ/Calc

I used a solution from @Jake from this post Insertion of Perpendicular Symbol at Intersection of Two Lines, but the alignment is not quite right. I have my suspicions why, but I don't understand the ...
2
votes
0answers
359 views

How to find intersections between line and rectangle with rounded corners [closed]

I'm trying to display a line "under" a rectangle. For this I tried using the intersections package, but somehow I the line doesn't stop: \documentclass[a4paper]{article} \usepackage{tikz} ...
2
votes
0answers
26 views

node at sloped path and/or not respecting every path/.style [duplicate]

I'm producing a schematic Nyquist plot, and I want to create an arc between the x-axis and a straight line, which should be denoted PM (phase margin). I use the intersections library to find the ...
8
votes
1answer
492 views

ellipse intersecting a circle

I am trying to draw an ellipse which intersects the sphere of influence, that is, the dashed circle around the moon. The ellipse needs to pass through (-170.864:.7cm) location along the v0 vector and ...
9
votes
1answer
215 views

Avoiding line intersection

i wanna do something like that: Non-intersecting lines on class diagram with that: http://www.texample.net/tikz/examples/oxidation-and-reduction/ It will be something like:
4
votes
1answer
216 views

Plotting the frequency bandwidth

I do not have almost any experience with pgfplot and I am having some problems with something which seemed really easy. What I want to do is filling the area between a function and two vertical ...
3
votes
1answer
375 views

Creating Interactive graphs like Stack exchange reputation tab

I like to prepare an interactive timeline graph (static on load, but dynamic on MouseHover event). Somehow is similar to the Stack-exchange reputation tab for an user. One classic example is here. ...
13
votes
1answer
554 views

How to decorate a path with arrows at certain coordinates?

Next example (taken from TiKZ manual) shows how to find intersection points between two paths. Once you know intersection points it's easy to decorate them with any marking. But if I want to use an ...
10
votes
2answers
2k views

Intersection of 2 surface plots in pgfplots

My question is pretty much a duplicate of this one. I'd like pgfplots to display the intersection between tho surface plots properly. Unfortunately, my function is quite different from the one in the ...
4
votes
1answer
87 views

Why two macros in intersections are not expancded?

Two path names inside intersections are not working. Only one macro seems to work. I have tries all the combinations of macro expansion but in vain. In the following 'h\x and \vy' is not working. It ...
3
votes
2answers
721 views

Make line extend beyond endpoint and intersect with line

Is it possible to have a line go through two coordinates and then extend until it intersects with another line? The line in question is not horizontal nor vertical (otherwise I could use the ...
1
vote
0answers
38 views

Extract x and y coordinates when using intersectionlibary [duplicate]

Possible Duplicate: Coordinates of intersections I have the following minimal plot \documentclass{standalone} \usepackage{pgfplots} \usetikzlibrary{intersections} ...
9
votes
2answers
533 views

Tikz — Rotating a line around an intersection

I've been trying to rotate a line around an intersection. The problem (I think) is that the intersection is in a previous scope (I need that to have the correct clipping), and the new scope doesn't ...
6
votes
1answer
342 views

TikZ Intersection missing the true intersection slightly

I'm having issues with the intersection feature. It works, but it seems to "miss" the true intersection a bit. The code below produces the error for me. See this image (can't post it directly because ...
3
votes
1answer
322 views

Lines generated with TikZ intersections are too short

My script calculates several intersections of lines (green) with a vertical "wall" (not shown). The intersections (small red dots) are fine. But the lines from one intersection to another intersection ...
17
votes
1answer
1k views

Intersection of two surfaces

I'm trying to create a signed distance function S(x), where I want to intersect S(x) = 0 with a plane. The problem is not to get the two functions into a plot, but to get the two functions to visual ...
8
votes
3answers
724 views

Intersection of lines to draw a convex function

I'm trying to draw (in TikZ) a convex function f constructed as the minimum of the linear functions f1, f2, f3 and f4. To do that, my inclination is to use the intersections of said lines to find the ...
7
votes
1answer
509 views

tikz intersection fails in combination with the library calc

In the second example I am trying to work the the library intersection. It works fine as long as I don't use the calc library. The first example shows my intention. I am using ($2*(w1')$) which ...
10
votes
2answers
2k views

“pgf Error: No shape named i-0 is known”, but only upon 2nd run

Update 2012-01-31: This seems to be a version (and/or OS specific) problem. It breaks on my latest TeXLive2011 on a Mac, but I can get it to run on my PC version of MiKTeX 2.8, and @MarcvanDongen ...
7
votes
3answers
2k views

How to Intersect an arc with a line without calculating the angle

I'd like to draw an optics-related figure, for which I need to draw several beams with varying opening angles, which will need to be labeled. What I've come up at the moment (boiled down to a minimal ...
11
votes
2answers
2k views

Coordinates of intersections

In axis environment I have a curve and a line intersecting it. How can I get components of intersection-1, intersection-2 etc. in axis units? \documentclass{minimal} \usepackage{pgfplots} ...
2
votes
1answer
177 views

finding points on path with given x-coordinate (marking f(x) points for given x's)

A y=f(x) function is given as path; for a set of x-coordinates, I want to place node (x,f(x)) onto the path, and connect it with (x,0) with vertical line. I have not got very far myself: \tikz{ ...
13
votes
3answers
7k views

TikZ: Intersection of two lines

what is the easiest way to determine the intersection of two lines? I tried \usetikzlibrary{intersections} \begin{tikzpicture}[every node/.style={black,above right}] \draw[name path=line 1] (0,0) -- ...
4
votes
1answer
323 views

More: Generalised: Accessing the logic values of a TikZ coordinate

This is a follow-up question to: Generalised: Accessing the logic values of a TikZ coordinate. In that question a PGFplot answer was suggested by jake. I took that answer and modified it to the ...
6
votes
1answer
1k views

How do I name a plot in tikz and use it for intersections?

I want to create a figure with 3 plots, a vertical reference line, and marks at the intersections of each plot with the reference line. The plots come from an external table. Plotting works, but ...
11
votes
2answers
2k views

How to access \xmin, \xmax, \ymin, \ymax from within PGFplots axis environment

In the MWE example below I have the values specified twice, but would prefer not to have to do that. Furthermore, it is possible to allow PGFplots to automatically select these end points so I would ...
12
votes
2answers
4k views

Insertion of perpendicular symbol at intersection of two perpendicular lines

This provides good details on How to draw a line passing through a point and perpendicular to another?. What I would like to do is to extend this somehow to add the usual geometry symbol to indicate ...
4
votes
1answer
663 views

How to specify a name path for the axis in PGFplots

When I use the {axis} environment, the axis are drawn automatically so I am not able to specify a name for them? I would like to be able to compute intersections with the axis as in Intersections in ...
7
votes
1answer
535 views

Is there a way to clear paths previously defined with name path global in TikZ

In the solution to Intersections in PGFplots it was pointed out that each \addplot command was drawn in its own scope and using name path would not survive outside of that \addplot command. The ...
13
votes
1answer
2k views

Intersections in PGFplots

I can get intersections to work in TikZ, but not PGF plots. I defined a command to show the intersections to make sure that it is identical in both cases. Commenting out the \ShowIntersection line in ...
4
votes
0answers
907 views

Drawing tri-axial ellipsoid and intersecting it with a sphere [closed]

I would like to draw a tri-axial ellipsoid (that is, an ellipsoid with three different main axes). I'd also like to draw a sphere in the same picture, showing the curves of intersection between the ...
7
votes
3answers
737 views

Bad intersection of lines in TikZ

Consider the following: \documentclass{minimal} \usepackage{tikz} \begin{document} \begin{tikzpicture}[line width = 4] \coordinate (a) at (0,0); \coordinate (b) at (1,0); \coordinate (c) at (1,1); ...