Movable Points

You can change a static point to a movable point by clicking and long holding the icon next to the expression list. A style editor will pop up with different drag options.

Another way to create a movable point is to enter a point with a parameter for one or both coordinates. Click and drag the point around the graph to change the value of the parameter(s).

 

To make graphs more interactive, use parameters from your movable point in your expressions.

Explore this graph here: https://www.desmos.com/calculator/slkjzmm3ly

 

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27 Comments

  • 2
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    Mbraun17

    can you limit the movable point to only move along a static line or curve?

  • 0
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    Finchs

    Mbraun17: Yes, you can limit a movable point to only move along a static line or curve: if you want to limit a point to stay on f(x), write this (a,f(a)). For Example (a,sin(a)) will make a point that is draggable along a sine wave and will set a to the points x coordinate.

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    羅驥韡

    Can we limit the movable point to only move along the unit circle x^2 + y^2 = 1 ?

  • 0
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    Sara Rezvi

    how do you attach an image to the movable point? I am doing an angry birds quadratic project, and want a yellow bird image to attach to a movable point on my parabola. How do I do that? Thanks!! ~ Sara

  • 0
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    Sara Rezvi
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    Team Desmos

    Sara - try putting the center of the image as (a, f(a)) and play the slider to move the image. Let us know if that does the trick!

  • 0
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    Dion Snopel

    Is it possible to graph more points, such as y3 & x3? (The Three's being lower.)

     

  • 0
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    Team Desmos

    Dion - you can create multiple movable points within a graph such as (a,b) and (x1, x2). 

  • 1
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    Whelpleyc7808

    can you make a triangle based on this theory

  • 0
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    Team Desmos

    You can create a triangle by making a table of points and connecting them!

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    Bquidzinski16

    Is there a way to have a triangle with two stationary points and one movable, if so can someone show me?

  • 0
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    Team Desmos

    Try using a table to achieve what you're looking for: https://www.desmos.com/calculator/etxitn5krt

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    Matthew Melgoza

    is there a way for moving point to have restriction? i am trying to make a box where there appears to have a ball bouncing around inside but i cant get rid of the excess 'balls'. i would like for it to seem like there is only one ball. here is my project: https://www.desmos.com/calculator/zqoio2i2p9

    Edited by Matthew Melgoza
  • 0
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    Bradstein PierrePaul
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    Team Desmos

    Bradstein: What sort of problem are you seeing? If you're able to describe it, we might be able to help you resolve it.

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    Bradstein PierrePaul

    If you move the point on the left to the right side, the line dissappears. It's the same for all 3 points.

    http://wikisend.com/download/769296/2016-07-07T23-03-21Z.webm 

  • 0
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    Team Desmos

    Bradstein: Thanks for the clarification. I've updated your graph with a little trick so that the triangle side considers min and max in the range restriction. https://www.desmos.com/calculator/lge94lcy0l

    You can use this approach to update the other two sides. Let me know if that helps. :)

  • 0
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    Edward Niemann

    If you still need help with that Bradstein, I would recommend something like this. I am not sure if this is the most efficient way, but it is what I usually do. https://www.desmos.com/calculator/kklsw2ur5e

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    ahmad fahadh ilyas

    How to limit movable point only move along circle or ellipse?

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    Sgsmathck

    Or getting a movable point on something like 0=x^3 + y^3 - 6xy ?

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    18pastrickk

    Is there a way to move multiple points at once the same time?

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    Whelpleyc7808

    Same variables in one point as the others

    Edited by Whelpleyc7808
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    Julian Chalmers

    How do you attach a movable point to the intercept point of two graphs so that you get a continuous read out of the coordinates of the intercept? Here is my graph: https://www.desmos.com/calculator/w3p0utvdzp 

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    Maya Mikelson

    I have a hyperbola with its vertex on the circumference of a circle. The circle is moving around around the point (5, 5) in an eliptical orbit. How do I put a circle on the hyperbola so that it moves along it and never leaves it. Here's what I have so far: https://www.desmos.com/calculator/csfgmn3u7f

    Thanks

    Edited by Maya Mikelson
  • 0
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    Mudassir

    As in cartesian we do like this https://www.desmos.com/calculator/ll3mv9e7lm similarly If i want a movable point that should move on the polar curve like  https://www.desmos.com/calculator/f1456ab1c3 by using slider. what should i do? 

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    Lucas Bowar

    What about getting a moving point along an ellipse, but while the ellipse is rotating. I am trying to graph the orbit of mercury.

    I know it's rough, but here is what I have so far: https://www.desmos.com/calculator/hudstsh8pj 

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    Janine Ryder

    Is it possible to copy some of the "Build a bigger fence" activity? I love it and want to use it for an intro to quadratics, but the first slide is very misleading to students, as "all areas are the same" is not an option. Is there anyway I can copy/edit this? thanks

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