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If \a extend_zero_length is true, then if the x or y vectors are empty
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they will be made length 1 in order to store the newly calculated
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void transform(Geom::Matrix const &matrix, double scale_x, double scale_y, bool extend_zero_length = false);
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void transform(Geom::Affine const &matrix, double scale_x, double scale_y, bool extend_zero_length = false);
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/** Gets current value of dx vector at \a index. */
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double getDx(unsigned index);