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m_arc.init(0.0, 0.0, rx, ry, start_angle, sweep_angle);
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trans_affine mtx = trans_affine_rotation(angle);
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mtx *= trans_affine_translation(cx, cy);
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for(unsigned i = 2; i < m_arc.num_vertices()-2; i += 2)
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mtx.transform(m_arc.vertices() + i, m_arc.vertices() + i + 1);