Triangulate crashes in sweep.cc:703 about poly2tri HOT 3 CLOSED

Looking at your set of values this is most likely a result of lack of floating 
point precision. 

This is because of your data range. If you translate and scale your point 
values to be in the range -1 and 1 you should be fine I think.

Just translating to be in centered around 0 should be enough but the epsilon 
used in the lib is tuned for values in the range 0 and 1. So scaling helps with 
precision tests to.

So if you have your points in an array[] you should try this:
Sometime you might also have to round values to 12 decimals since poly2tri uses 
en epsilon of 1.0e-12 for some tests.

double d;
double[] range = new double[] { Double.MAX_VALUE, 
Double.MIN_VALUE,Double.MAX_VALUE, Double.MIN_VALUE };
double[] center = new double[2];

for( int i=0; i<array.length; i += 2 )
{
   range[0] = Math.min( array[i], range[0] );
   range[1] = Math.max( array[i], range[1] );
   range[2] = Math.min( array[i+1], range[2] );
   range[3] = Math.max( array[i+1], range[3] );
}

center[0] = (range[0] + range[1])/2;
center[1] = (range[2] + range[3])/2;

if( (range[1]-range[0]) > (range[3]-range[2]) )
{
   d = 2/(range[1] - range[0]);  
}
else
{
   d = 2/(range[3] - range[2]);  
}

for( int i=0; i<array.length; i += 2 )
{
   array[i] = d*(array[i] - center[0]);
   array[i+1] = d*(array[i+1] - center[1]);
}

This was a precision issue in input data