Questions on position tracking, especially using Mathematica coordinate tracking functions and control objects such as Locator, LocatorPane, and ClickPane.

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4
votes
1answer
158 views

Overlaying location pointer on to a png file

So I have started off with importing a png image of size $512\times 1024$ px. I have then created two locators as demonstrated on the Wolfram tutorials: ...
1
vote
1answer
179 views

Behaviour of Locator

I seek advice regarding the constrained behaviour of the Locator: appears confined to square {0,0}->{1,1}. When I change starting position it snaps to this constrained region. The code I am referring ...
4
votes
1answer
765 views

How do I draw a credible velocity vs. time graph using Locators?

This is partly a math question, partly a Mathematica question. For educational purposes, I'm making a simple demonstration to create a velocity over time graph from six locators. On the basis of ...
2
votes
2answers
180 views

Manipulating several values from the same interval

Some of my calculations depend on the choice of several values from the interval [-2, 2] (it is more or less interpolation of a fixed function using the points as parameters). I want to create a ...
1
vote
2answers
250 views

Locator following other locator in DynamicModule

I'm trying to create a dynamic environment where I specify, using two locators, the initial condition (position (x,y) and velocity angle (alpha)) of a 2D particle. To simplify, I'm assuming the ...
0
votes
1answer
98 views

Item Resizing when using Locators

I am having some difficulty in resizing a Stream Plot when using locators: Whenever I try to resize the Stream Plot, one of the locators instead moves to the cursor. ...
5
votes
1answer
171 views

Using the mouse coordinates to index a matrix

I would like to "write" on to a matrix using the mouse. That is, I would like to use the integer value of Locator coordinates (p) to index a matrix. Then, if the mouse button is down, write a 1 in ...
6
votes
2answers
429 views

How to dynamically update Locator[] constraints?

I need to visualize Menelaus' theorem for a triangle with moving locators for each of six points. So the vertexes of the triangle can move in any possible way, and the three points on the sides of the ...
9
votes
1answer
255 views

Locator Appearance

I am using LocatorPane with LocatorAutoCreate -> True. I would like to have the appearance of each new locator be different. ...
6
votes
1answer
198 views

Different actions with dragging and clicking points in same graphic

On a graphic (in this example a simple plot), I need two points to move when I drag with the mouse, and these points must move to location {1,1} when I click on them. This is how I got it to work, ...
4
votes
3answers
779 views

How to align dynamic graphics and an image within an Overlay?

I have dynamic graphics over an image but they won't line up, what am I doing wrong? ...