bool
CubeSpatialReference::transformExtentToMBR(const SpatialReference* to_srs,
double& in_out_xmin,
double& in_out_ymin,
double& in_out_xmax,
double& in_out_ymax ) const
{
// input bounds:
Bounds inBounds(in_out_xmin, in_out_ymin, in_out_xmax, in_out_ymax);
Bounds outBounds;
// for each CUBE face, find the intersection of the input bounds and that face.
for (int face = 0; face < 6; ++face)
{
Bounds faceBounds( (double)(face), 0.0, (double)(face+1), 1.0);
Bounds intersection = faceBounds.intersectionWith(inBounds);
// if they intersect (with a non-zero area; abutting doesn't count in this case)
// transform the intersection and include in the result.
if (intersection.isValid() && intersection.area2d() > 0.0)
{
double
xmin = intersection.xMin(), ymin = intersection.yMin(),
xmax = intersection.xMax(), ymax = intersection.yMax();
if (transformInFaceExtentToMBR(to_srs, face, xmin, ymin, xmax, ymax))
{
outBounds.expandBy(Bounds(xmin, ymin, xmax, ymax));
}
}
}
if (outBounds.valid())
{
in_out_xmin = outBounds.xMin();
in_out_ymin = outBounds.yMin();
in_out_xmax = outBounds.xMax();
in_out_ymax = outBounds.yMax();
return true;
}
else
{
return false;
}
}
