Hi,
Here comes again. Sorry I send it from a wrong address.
-------- Forwarded Message --------
Subject: Dr Geo: A point needs to be animated over a preexisting object?
Date: Mon, 21 Sep 2015 20:09:29 -0500
From: Offray Vladimir Luna Cárdenas <offray.l...@mutabit.com>
To: Any question about pharo is welcome <pharo-users@lists.pharo.org>
Hi,
Some of my students are exploring modeling as a tool to understand
physical phenomena. In particular they're working on uniform movement.
The idea is to take data from a lab experiment on uniform movement and
plot it on a geometrical program and then use animation to reproduce the
lab movement inside the plotting to see if they can get the analitycal
expression which models the movement. The bridge between experimental
data and the analytical expression is animation as a way to validate,
reconstruct models. We're considering geogebra and DrGeo for this. I'm
more familiar with smalltalk that with javascript, but the question
we're facing is how to animate a point following a vector direction but
going beyond it.
Considering the following figure:
So the idea is that A, B, C and D are points in a position versus time
graph taken from the real lab experiment. "p" is a point which will
follow the trajectory of the vector "u", which has the same direction of
the segment that goes from A to B (it can be even overlapped) and is
animated describing the red trajectory going for p to p' (which has the
same x value of D, but a different y value). A way to do it will be put
and invisible line that passing from A to B (and beyond) and make the
point "p" move on it, but we're wondering if there is a way to just give
vector direction and magnitude and make the point move, without creating
an explicit line before.
Seems that nor geogebra or DrGeo can deal with animating a free object
following a (vectorial described) trajectory.
Is this possible?
Cheers,
Offray
