Questions tagged [locator]
Questions on position tracking, especially using Mathematica coordinate tracking functions and control objects such as Locator, LocatorPane, and ClickPane.
106
questions
0
votes
1
answer
51
views
TrackingFunction does not work when more than one Locator in Manipulator
TrackingFunction example
Manipulate[
Graphics[Circle[], PlotRange -> 2],
{{pt, {0, 0}}, Locator, TrackingFunction -> (pt = #/Max[Norm[#], 1]; &)}]
...
- 197
2
votes
0
answers
39
views
Freeze slider if locator moved
I have list of many locators in my Manipulate:
{{listoflocs, listoflocsinit }, Locator, LocatorAutoCreate -> True }
And I have a slider there:
...
- 21
0
votes
0
answers
55
views
Reset Button for Manipulate and freezing Sliders
I work on a Bezier curve subdivision project. I managed to implement it, but I faced some problems. (The code of my program is presented below.)
Firstly, if I change parameter n after changing other ...
- 21
5
votes
1
answer
251
views
Calligraphic Pen Signature Pane
This exchange about writing the infinity symbol using a calligraphic pen nib (https://mathematica.stackexchange.com/a/13376/43662) gave me an idea that is a bit steep for me to implement.
The idea is ...
- 1,951
0
votes
1
answer
106
views
Two locators in separate plots using Manipulate
I want to create two figures, side by side, each with an independent Locator.
I want to do this using Manipulate, because I can easily use information from each Locator in both plots.
This answer did ...
- 73
3
votes
2
answers
175
views
Selecting Plot for Locator
Assume I have a manipulate with two graphics/plots as outputs. One of my parameters is a locator. How can I select in which of the plots the locator appears?
Let's say I have the output given by this:
...
7
votes
2
answers
249
views
Manipulate[] with interdependent Locators
how would I create a Manipulate to draw a InfiniteLine between two Locator?
The first Loactor should control the x/y of the first point together with the y of the second one.
The second Locator should ...
- 851
4
votes
1
answer
97
views
How to use multiple Locators with different TrackingFunction in Manipulate?
I am trying to use TrackingFunction with Locator inside Manipulate, and it works fine with a ...
- 217
2
votes
1
answer
61
views
How to restrict a locator to a line that changes based on manipulated variables?
I am trying to have a locator move along a manipulated line but every time I manipulate the variables the locator doesn't move across the new line. How can I get the locator to move across the line ...
- 23
3
votes
0
answers
134
views
a "Calculate" button for Manipulate with Locator points
Looking for a methodology where the user can move the points of a Locator and then click a button to ask for calculations to proceed. The motivation for this is that the calculations of the full ...
- 1,027
3
votes
1
answer
141
views
Removing locators breaks labels
I have some locators in a LocatorPane and want to let users remove them. Unfortunately, it seems doing this conflicts with the ...
- 31.2k
4
votes
0
answers
67
views
Remove Locator doesn't work
I have the issue that I can't remove Locators, when using LocatorAutoCreate->True.
For example the code snippet taken from "LocatorPlane" -> Options-> LocatorAutoCreate
...
- 81
3
votes
1
answer
71
views
How to make a LocatorPane Appearance option dynamic?
I have a DynamicModule that contains a LocatorPane. The number of locators can be changed. The locators are labelled with a number. When the number of locators are changed the label numbers should ...
- 16.1k
2
votes
1
answer
62
views
Can I make the locators in a locator pane move over the whole pane?
I'm trying use LocatorPane to produce locators that can move anywhere in the entire row of text I am displaying and not just in one of the rectangles, which is what ...
- 547
3
votes
1
answer
155
views
How can I prevent TabView from resetting the current tab?
This is a simplification of a problem that has arisen in a project regarding Euclidean activities for verifying proportions via operations
on pairs of magnitudes. In the project, the LocatorPane is ...
- 16.6k
6
votes
1
answer
149
views
How to control two different variables with Locator?
It's my first time here but I didn't find answer to my problem and I can't menage that by myself,Mathematica documentation or even by previous stackexchange problems.
In Manipulate I have two ...
- 484
4
votes
0
answers
35
views
AutoAction not working with Locator and LocatorPane
This code is from the "Neat Examples" part on the LocatorPane page of the documentation:
...
8
votes
1
answer
228
views
How to make a Locator3D/LocatorSphere?
On Making a LocatorSphere:
Okay so I'm trying to realize a Locator3D-esque functionality for Mathematica. Something like a <...
- 3,322
1
vote
1
answer
234
views
Fix " not a Graphics primitive or directive" error in Dynamic Locator Pane
I am aware this might seem like a duplicate, however, I have viewed these posts (1 & 2) and have been unable to solve this.
...
- 547
1
vote
1
answer
178
views
Two locators on two different plots in Manipulate
I am trying to create a Manipulate module that shows two plots, and have locators on each of those plots, as well as two sliders. The locators do do not affect each ...
- 402
6
votes
1
answer
122
views
How to implement LocatorAutoCreate functionality using EventHandler[]?
The documentation for LocatorPane says that LocatorPane is a special case of EventHandler, and gives the following code:
...
- 117
1
vote
1
answer
60
views
Locator position as argument in ImageTrim
I want to create a snippet that shows an image with two locators, and side-by-side with its crop based upon the position of the locators. Here is what I wrote. But it gives error that the list of ...
- 794
2
votes
1
answer
63
views
How to change color of LocatorPane Dynamic point constrained to LogLogPlot line - when point is above set value?
In the following LogLogPlot, I'd like to have the Dynamic[pt] color change from Purple to <...
- 167
2
votes
1
answer
53
views
How to constrain LocatorPane Dynamic point to a LogLogPlot line?
LocatorPane constrains to Plot[curve]:
...
- 167
7
votes
1
answer
227
views
Mean RGB value of a locator region?
i am working at a color deconvolution using Ruifrok and Johnston's method (as described here).
To get a custom stain, I need to realize a vector with mean RGB values of a region in a given image. So ...
- 71
2
votes
1
answer
106
views
Creating multiple locators in Manipulator with constrained motion
I found a code to create multiple controls for a manipulate with a manipulate input and is working perfectly.
...
9
votes
1
answer
279
views
How to make simple closed curve that can be smoothly morphed using locators
Given a simple closed curve in 2D with some locators on it, I would like to have be able to stretch and squish parts of the curve by moving the locators to morph the curve into another simple closed ...
- 5,463
7
votes
2
answers
687
views
How to add a point and drag it into position in a 3D plot?
I have some plotted points and I would like to add new points and be able to drag a pre-existing or added point using my mouse. After I am satisfied with the new plot, I would like to extract the ...
- 10.5k
3
votes
2
answers
194
views
How to rotate a graph with a locator?
Manipulate[
Graphics[Rotate[Line[{{0, 0}, p}], \[Theta], {0, 0}],
PlotRange -> 2], {{p, {1, 1}}, Locator}, {\[Theta], 0, 2 \[Pi]}]
I want to rotate a graph ...
- 95
3
votes
0
answers
50
views
Is it possible to prevent LocatorPane from modifying locator positions unless Alt ket is down?
I am using the LocatorAutoCreate option which allows the user to hold Alt while clicking in order to create/remove locators. However, I need to be able to prevent ...
- 31
11
votes
3
answers
342
views
How do I determine which Locator is selected in a LocatorPane with multiple Locators?
This is a cross-post of http://community.wolfram.com/groups/-/m/t/1186782
I am working on something where I need to know which locator out of many is currently being changed.
Here is some working ...
- 3,968
3
votes
1
answer
78
views
Is it possible to use the second argument of Dynamic when the first argument is a list?
I want to make a LocatorPane which allows the user to move the locators, with the restriction that the locators can only be moved to integer coordinates. However, I ...
- 33
2
votes
1
answer
165
views
How can I scale a locator's coordinate within an image?
How can I use the Scaled feature and modify the Appearance of the Locator within ...
- 1,853
1
vote
1
answer
117
views
Initial Value of Locator in Manipulate
Consider the following example:
Manipulate[u, {u, Locator}]
which evaluates to:
Now, if you start moving the locator around, you will see the coordinates update:...
- 1,008
2
votes
2
answers
130
views
Problems With Locator Position Resetting
I am currently attempting to write code that allows users to add shapes to a window and arrange them to create an image. To do this, I make each shape into a locator. This method seems to work well. ...
- 23
2
votes
0
answers
138
views
How to fix a locator to a desired plot of a Grid of plots?
In my interactive demonstration there is a grid of plots, where 2 are 1D plots and the other 2 are contour ones. I need a locator placed in one of the contour plots to manipulate the parameters of the ...
- 38.7k
1
vote
0
answers
146
views
Constraining locators [duplicate]
Is there any canonical way to constrain locators either continuously (e.g. to lie on the graph of a function) or discretely (snap to grid leaps to mind)? The documentation seems a little sketchy on ...
- 5,064
1
vote
1
answer
184
views
Making a cursor for graphics using a Locator in LocatorPane
I am trying to add some cursors to a plot. I am using LocatorPane and form the cursors by setting the Appearance option. However, I can't seem to find out how big the cursors will be and I need them ...
- 16.1k
2
votes
2
answers
263
views
Assign Locator points to a specific plot
Result on the left is not what I intended to do: it has two sets of Locator points. Trying to determine why two sets of Locator points are appearing. I only intended to have one set.
Result on ...
- 1,027
2
votes
2
answers
142
views
Why does `Locator` changes graphics depending on `ImageSize`?
This is driving me nuts. Consider this Manipulate command
...
- 5,423
1
vote
0
answers
211
views
Implementing a Locator for Graphics3D drawing tools for programmatic drawing
As a hobby I write from time to time some tools for programmatic technical drawing. Below I give an example of a function modifyGraphics[] which enables one to fast ...
- 38.7k
4
votes
1
answer
193
views
Performance issue of Manipulate with NSolve and Locator
I want to solve a nonlinear equation eq in a Manipulate environment as the following one using a ...
- 5,423
3
votes
1
answer
105
views
3
votes
1
answer
277
views
Overlaying an image with a movable disk that can be resized
I'm trying to create this:
A map with a PNG picture in the background
A locator for position
The locator (p1) needs to have a disk with center in p1
The problem is that the locator disk and the map ...
- 157
2
votes
0
answers
86
views
How constrain a Locator to follow a list of points inside Manipulate?
I would like position two locators on discrete positions which are list's elements and represent a list of point's coordinates.
I've ani image and on this I've detected ten circle shape. Now I'd like ...
- 21
6
votes
1
answer
195
views
Constraining locators in a locator pane to a specified data set
What is the best method to constrain multiple locator points to a set of data? A while back, I needed a program that could perform a linear fit for a specified range of data points. In an effort to ...
- 61
6
votes
2
answers
620
views
Insert new points at specific places in the Locator Pane?
I am trying to make some BSplineCurve examples for my students. For fun I created the following Manipulate that draw an elephant using ...
- 1,047
2
votes
2
answers
137
views
Dynamic locator: update to new position inside `Manipluate`
I'd like the locator to update to its new position when k is altered:
...
- 8,152
3
votes
2
answers
183
views
Preventing LocatorPane Locator from moving when PlotRange changes
I have a LocatorPane within a Manipulate such that the range of the plot behind the Locator ...
- 33
3
votes
1
answer
81
views
Context-aware Locator
I'm trying to use a Locator for some image processing tasks. Unfortunately, the images we're using have a high dynamic range of low-frequency black and white ...
- 1,800