A Silverlight 4 application that uses the CompositionTarget.Rendering
event to create a hypnotic animation effect of coloured circles moving across a
Canvas playing field. This is an expanded and more entertaining version of the app
I wrote a few weeks ago as a proof of concept that this is the correct technique
to create "long running animations". The original app only had one circle
moving at fixed speed, now you can adjust the speed and the size and count of the
circles.
The (x,y) points of each circle are calculated by a random sum of Sine functions
like this:
x = s1 Sin[c1 * arg] + s2 Sin[c2
* arg] + s3 Sin[c3 * arg] + ...
y = same technique
The sn sign values are random +1 or -1. The cn coefficient values are random
values from 0.5 to 6.0. This creates a long and seemingly chaotic closed path which
is a kind of Lissajous pattern. The circles have random colours and they fly around
the path at different argument offsets. For simplicity, the circles all have the
same size and they all move at the same speed.
This app is only intended to demonstrate the lovely animation effects you can create
by listening to the Rendering event; it has a fixed size window, it
does not use binding and it has not been globalised or localised. A zip of the complete
Visual Studio 2008 solution is available HERE.
Greg Keogh (29-May-2010)
Back to: Computers Home Page
To clarify what the "seemingly chaotic closed path" looks like, below
is a parametric plot generated by Mathematica V7 using randomly chosen signs and
argument coefficients with 3 terms. The demo app uses 5 terms, so the path is even
longer and more convoluted.
