+/*
+ * Begin/rest-of-line hack. This geometrical shape is a crude approximation
+ * of Skyline, but it is better than a rectangle.
+ */
+struct Line_shape
+{
+ Interval begin_;
+ Interval rest_;
+
+ Line_shape ()
+ {
+ }
+ Line_shape (Interval begin, Interval rest);
+ Line_shape piggyback (Line_shape mount, Real padding) const;
+};
+