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use lib "$FindBin::Bin/../lib";
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use Slic3r::Geometry qw(rad2deg_dir angle3points PI);
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#==========================================================
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is line_atan([ [0, 0], [10, 0] ]), (0), 'E atan2';
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is line_atan([ [10, 0], [0, 0] ]), (PI), 'W atan2';
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is line_atan([ [0, 0], [0, 10] ]), (PI/2), 'N atan2';
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is line_atan([ [0, 10], [0, 0] ]), -(PI/2), 'S atan2';
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is line_atan([ [10, 10], [0, 0] ]), -(PI*3/4), 'SW atan2';
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is line_atan([ [0, 0], [10, 10] ]), (PI*1/4), 'NE atan2';
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is line_atan([ [0, 10], [10, 0] ]), -(PI*1/4), 'SE atan2';
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is line_atan([ [10, 0], [0, 10] ]), (PI*3/4), 'NW atan2';
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#==========================================================
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is line_direction([ [0, 0], [10, 0] ]), (0), 'E direction';
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is line_direction([ [10, 0], [0, 0] ]), (0), 'W direction';
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is line_direction([ [0, 0], [0, 10] ]), (PI/2), 'N direction';
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is line_direction([ [0, 10], [0, 0] ]), (PI/2), 'S direction';
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is line_direction([ [10, 10], [0, 0] ]), (PI*1/4), 'SW direction';
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is line_direction([ [0, 0], [10, 10] ]), (PI*1/4), 'NE direction';
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is line_direction([ [0, 10], [10, 0] ]), (PI*3/4), 'SE direction';
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is line_direction([ [10, 0], [0, 10] ]), (PI*3/4), 'NW direction';
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#==========================================================
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is rad2deg_dir(0), 90, 'E (degrees)';
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is rad2deg_dir(PI), 270, 'W (degrees)';
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is rad2deg_dir(PI/2), 0, 'N (degrees)';
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is rad2deg_dir(-(PI/2)), 180, 'S (degrees)';
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is rad2deg_dir(PI*1/4), 45, 'NE (degrees)';
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is rad2deg_dir(PI*3/4), 135, 'NW (degrees)';
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is rad2deg_dir(PI/6), 60, '30°';
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is rad2deg_dir(PI/6*2), 30, '60°';
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#==========================================================
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is angle3points([0,0], [10,0], [0,10]), PI/2, 'CW angle3points';
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is angle3points([0,0], [0,10], [10,0]), PI/2*3, 'CCW angle3points';
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#==========================================================
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return Slic3r::Line->new(@$l)->atan2_;
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return Slic3r::Line->new(@$l)->direction;
b'\\ No newline at end of file'