I found an error. The main loop computes the squared area of each
rectangle. It should compute the squared area of each triangle. I
have divided the squared area result by 4 to compensate.
Also, I have tweaked the zoom level algorithm. The API controls zoom
speed. I will bet if you run a histogram on the characters in the
zoom level string, you will find a significantly different number of
points at each zoom level between the two algorithms. Clearly, more
points at a given zoom level will result in longer zoom times. I am
using the first level at which a point deviates from a straight line
by one pixel. Changing the tolerance will change the zoom string
which will impact zoom speed.
Finally, I may be nit-picking but the area computation depends on both
the x & y components. If the x & y components to not share a common
scale, the area comnputation will be biased. A degree of Longitude
difference should have less influence than a degree of Latitude
difference. At the equator the error is zero. At each pole the error
is infinite.
The changes can be found in:
www.polyarc.us/packer.js
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