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my $point = new Point();
$point->set_X( 3 );
...
$end_point = $point->copy();

$image->draw_line_from_to( $start_point, $end_point, BLACK );

my $point = new Point(3, 4);
...
...

my $end_point = $point;
$image->line( $start_point, $end_point, BLACK );