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SPItem *group_at_point (Geom::Point const p) const;
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Geom::Point point() const;
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void set_display_area (double x0, double y0, double x1, double y1, double border, bool log = true);
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void zoom_absolute (double cx, double cy, double zoom);
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void zoom_relative (double cx, double cy, double zoom);
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void zoom_absolute_keep_point (double cx, double cy, double px, double py, double zoom);
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void zoom_relative_keep_point (double cx, double cy, double zoom);
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void zoom_relative_keep_point (Geom::Point const &c, double const zoom)