Remove cairo dependencywip-nocairo

We initially used Cairo for its bezier flattening algorithm. That
algorithm turned out to be a bit too imprecise at the scales we're
working at here (#17), so I ended up porting over some code from
Antigrain Graphics. The only other thing we used Cairo for was debug
output and coordinate transforms, so I just wrote the relevant vector
math in a small header file, deleted all debug output code and thus
eliminated the cairo dependency. This is a step towards Windows builds.

1 files changed, 0 insertions, 1 deletions

diff --git a/svg-flatten/src/flatten.cpp b/svg-flatten/src/flatten.cpp
index e93f044..cb7f427 100644
--- a/svg-flatten/src/flatten.cpp
+++ b/svg-flatten/src/flatten.cpp
@@ -7,7 +7,6 @@
 using namespace gerbolyze;
 
 namespace gerbolyze {
-    const double curve_distance_epsilon                  = 1e-15;
     const double curve_collinearity_epsilon              = 1e-15;
     const double curve_angle_tolerance_epsilon           = 0.1;
     constexpr unsigned curve_recursion_limit             = 20;