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rstar-tree's Issues

SpatialPoint.distance seems wrong

SpatialPoint.distance(...) looks like this:

        float distance = 0;
        for (int i = 0; i < _cords.length; i++) {
            float tmp = (_cords[i] * _cords[i]) - (otherPoints[i] * otherPoints[i]);
            if(tmp < 0)
                tmp = -1 * tmp;
            distance += tmp;
        }
        return (float)Math.pow(distance, 0.5);

I believe this is wrong. The calculation of tmp should look like this:
float tmp = (_cords[i] - otherPoints[i]) * (_cords[i]) - otherPoints[i]);

The whole loop could then be simplified to:

        float distance = 0;
        for (int i = 0; i < _cords.length; i++) {
            float tmp = _cords[i] - otherPoints[i];
            distance += tmp * tmp;
        }
        return (float)Math.sqrt(distance);

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