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gdouble sp_absolute_metric_to_metric (gdouble length_src, const SPMetric metric_src, const SPMetric metric_dst);
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GString * sp_metric_to_metric_string (gdouble length, const SPMetric metric_src, const SPMetric metric_dst, bool m);
9
GString * sp_metric_to_metric_string (gdouble length, const SPMetric metric_src, const SPMetric metric_dst, gboolean m);
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// convenience since we mostly deal with points
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#define SP_METRIC_TO_PT(l,m) sp_absolute_metric_to_metric(l,m,SP_PT);