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The Algorithmist

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Prince EXO3 Black Review Part 2

My recent two hitting sessions were against a heavy, cold wind.  I was quite pleased with how the frame held up against the wind.  Here are some pics of the racquet, courtesy of Tom Coyle (Hilton D/FW Lakes).  The EXO3 Black is shown by itself and compared right next to the O3 Speedport Black (both [...] (translate)

Prince EXO3 Black Review Part 1

This is the first in a multi-part review of the Prince EXO3 Black.  I’ve hit with this racquet four times with my standard stringbed of Pro Hurricane Tour 17 on the mains and VS Team Gut 17 on the crosses.  I previously used an O3 Speedport Black, although have been hitting with the Black Team [...] (translate)

Prince EXO3 Black

I can’t believe I have a new racquet.  I’ve been hitting with the O3 Speedport Black Team while recovering from a shoulder injury.  For some time, I have wanted to upgrade to a heavier, stiffer frame.  A couple months ago, I heard that Prince was coming out with the successor to the Speedport Black and [...] (translate)

Going Underground for a While

Just returned from a long business trip.  I’ve started a new and pretty intense gig.  I’m back to work with the Flex framework for the first time in two years and already doing Google Finance-style data visualizations.  I’ll be extremely busy for the next two weeks and then go on vacation for two weeks.  I [...] (translate)

Degrafa Cardinal Spline

The Degrafa Cardinal spline is now available from the Origin branch.  Usage is very similar to the Catmull-Rom spline with the exception of the tension parameter.  The Cardinal spline is based on the C-R code base, so it supports closure.  The algorithm is the same as the C-R spline, so it is best used for [...] (translate)

Degrafa Bezier X at Y Test Program

There is not much difference from the demo of the Bezier x-at-y method from the previously posted y-at-x demos.  Here is the MXML for the test case.  Most of the heavy lifting is in the displayXatY() method.  Study that and you should have a pretty good understanding of how the Bezier x-at-y method is applied. If [...] (translate)

Bezier Y at X Algorithm

A few requests for the algorithm behind the Bezier y-at-x and x-at-y methods have been received.  The code is self-contained in the com.degrafa.geometry.AdvancedQuadraticBezier and AdvancedCubicBezier classes.  Both classes accept control points in their constructors and use classes from com.degrafa.utilities.math .  The latter classes are independent from any internal Degrafa architecture.  So, people who maintain their [...] (translate)

New Degrafa Bezier Methods

I have received a couple requests for x-at-y methods in the advanced quadratic and cubic Bezier classes to complement the existing y-at-x methods.  Fortunately, the algorithm is the same, just a different set of coefficients, so it was an easy addition. The x-at-y problem is typically used to distribute sprites left-to-right and top-to-bottom along the contour [...] (translate)

Cardinal Splines Part 5

Continuing from part 4 of this series, we are looking at tension values outside the range of zero to one. When T is negative, then s = (1-T)/2 increases from 1/2 and grows without limit as T becomes larger negative. So, what happens for large values of s? Using the same four knots and [...] (translate)

Cardinal Splines Part 4

Continuing from part 3 of this series, a formal tension parameter, T = 1-2s, was introduced. All we noted about tension was that T=0 corresponds to s = 1/2. At s=1/2, the Cardinal spline takes on the form of the more familiar Catmull-Rom spline. The Catmull-Rom spline may, however, be derived independently [...] (translate)

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