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  1. or download this
    my @clips = (
        { cx => $X * 0.500, cy => $Y * 0.4,   rx2 => ( $X * 0.295 )**2, ry
    +2 => ( $Y * 0.40 )**2 },
    ...
        { cx => $X * 0.428, cy => $Y * 0.748, rx2 => ( $X * 0.067 )**2, ry
    +2 => ( $Y * 0.038)**2 },
        ...
    };
    
  2. or download this
    sub clip {
        my( $x, $y ) = @_;
    ...
        ...
        return 0;
    }