57 lines
2.0 KiB
Python
57 lines
2.0 KiB
Python
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#! /usr/bin/env python3
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'''
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Copyright (C) 2019 Grant Patterson <grant@revoltlabs.co>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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'''
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from math import copysign, cos, pi, sin
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from inkex import Transform
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def rotate_matrix(node, a):
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bbox = node.bounding_box()
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cx = bbox.center_x
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cy = bbox.center_y
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return Transform([[cos(a), -sin(a), cx], [sin(a), cos(a), cy]]) @ Transform([[1, 0, -cx], [0, 1, -cy]])
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def optimal_rotations(node, precision):
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step = pi / float(precision)
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bbox = node.bounding_box()
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min_width = bbox.right - bbox.left
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min_width_angle = None
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min_bbox_area = min_width * (bbox.bottom - bbox.top)
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min_bbox_area_angle = None
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for i in range(precision):
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angle = -pi/2.0 + i*step
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rotated = node.bounding_box(rotate_matrix(node, angle))
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width = rotated.width
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height = rotated.height
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bbox_area = width * height
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if width < min_width:
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min_width = width
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min_width_angle = angle
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if bbox_area < min_bbox_area:
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if width > height:
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# To keep results similar to min_width_angle, rotate by an
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# additional 90 degrees which doesn't affect bbox area.
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angle -= copysign(pi/2.0, angle)
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min_bbox_area = bbox_area
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min_bbox_area_angle = angle
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return min_width_angle, min_bbox_area_angle
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