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#include <glib/gstring.h>
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#include <glib/gtypes.h>
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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, 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);
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#define SP_PT_TO_METRIC(l,m) sp_absolute_metric_to_metric(l,SP_PT,m);
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#define SP_PT_TO_METRIC_STRING(l,m) sp_metric_to_metric_string(l, SP_PT, m, TRUE)
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#define SP_PT_TO_STRING(l,m) sp_metric_to_metric_string(l, SP_PT, m, FALSE)
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#define SP_PX_TO_METRIC_STRING(l,m) sp_metric_to_metric_string(l, SP_PX, m, TRUE)
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#define SP_PX_TO_STRING(l,m) sp_metric_to_metric_string(l, SP_PX, m, FALSE)