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+# Code Health:
+ - Rewrite old tests using Google Test Framework.
+ - Add more unit tests. Ideally, every method should be tested.
+ - More Doxygen documentation. Document algorithms used to implement each
+    nontrivial method, preferably with pictures.
+ - Coding style.
+ - Rewrite or remove old junk.
+
+# Primitives:
+ - Add uniform points - Geom::UPoint.
+ - Add projective transformations - Geom::Projective.
+ - Add rational Bezier fragments / curves - Geom::D2U<Bezier>
+
+# Shapes:
+ - Geom::Triangle
+ - Geom::Quad
+ - Geom::Polygon
+ - Function that computes an Affine that maps between triangles.
+ - Function that maps between Rects.
+ - Function that maps between Ellipses (no skew).
+
+# Path / PathVector:
+ - Built in support for arc length parametrization, computed on demand.
+ - Boolean operations accessible via operators: &, |, / (or -), ^
+ - Uncrossing.
+ - Conversion from nonzero winding rule to even-odd winding rule.
+ - Dashing - requires arc length parametrization.
+ - Offset.
+ - Stroke-to-path.
+ - Minkowski sum.
+ - Functions to facilitate node editing without conversion to a node list.
+ - Approximation of arbitrary paths with cubic Beziers, quadratic Beziers
+    or line segments, available as a path sink.
+ - Approximation by lines and circular / elliptical arcs.
+ - Support for per-node and per-segment user data?
+
+# Fragments:
+ - Convert all uses of std::vector<Point> to D2<Bezier> where applicable.
+ - Consider adding push_back() for incremental building of Beziers.
+ - Implement Bezier versions of SBasis methods.
+
+# Toys:
+ - Better Bezier / SBasis handles.
+ - Use GTK 3 to provide widgets such as checkboxes and buttons (?)
+
+# Other:
+ - sweeper.h: add variants of Sweeper that accept void Item
+    and add a version that does sweepline over two lists rather
+    than one.
+ - Rewrite conic section code to match coding style.
+ - Rewrite QuadTree and RTree to make them actually usable.
+ - BSP tree.
+ - Interval tree - Geom::IntervalSet, Geom::IntervalMap<T>
+ - Geom::MultiInterval
+ - Using the above, add regions, as seen in Cairo.
+ - Add some basic 3D functionality, enough to draw a 3D box.
+ - Write GDB pretty printers for all core classes. See the directory "tools"
+ - Clothoid support (clothoids where the curvature is a not-necessarily linear
+   function, perhaps piecewise SBasis, add fitting)
+ - Special geometric shapes (stuff like circles, oriented rectangles, spirals,
+   triangles, regular polygons, inkscape-like polygons, etc)
+ - Constraint system for advanced handle stuff
+ - complete and tidy up intersection apis
+ - complete offset implementation: at this stage only the hard part has been
+ implemented
+ - conic sections: we currently support line and ellipse from xAx form, add
+ parabola and hyperbola; intersection
+ - NURBS (2geom handles division approximation of polynomials, code just needs
+   to be added to convert between standard forms (say x/w, y/w in bernstein and
+     pw<d2<sb>>(t))
+ - T-mesh form for 2D (and higher?) piecewise polynomials
+ - enhance contour tracing algorithm (sb-2d-solver)
+ - transform an svg stroke in an outline (extends offset curve code to handle
+   SVG options)
+ - variable width curve tracing (variant on path along path idea)
+ - collinear tangent (find a line that smoothly connects two curves); extension
+ of bezier clipping idea
+ - transform a path into a single curve (fitting) - improvements required
+ - exploiting modern architecture features (cache coherence, multi-core, packet
+   instruction set, gpgpu)
+ - finish boolops (use faster and more robust sweep-window algorithm, add
+   support for dB @ dB, dB @ B, B @ B where @ is any of the 16 boolean operators
+   that make sense)
+ - bucket fill (variant of bool ops for bucket filling)
+ - path topology and numerical soundness graph