commit c3eaa477481604bc4df798ea21254df72e4920b4
author James Kuszmaul <jabukuszmaul+collab@gmail.com> Wed Mar 03 19:43:45 2021 -0800
committer James Kuszmaul <jabukuszmaul+collab@gmail.com> Wed Mar 03 19:44:56 2021 -0800
tree 7934a8adbedb0b70d3dc541b07ca9ace1a283ee9
parent 0f254d014d9d2686a5377325d279c347aefff68a

Fix segfaults in spline UI

I suspect that this actually started happening when Python upgrades
happened, since the previous logic was checking for zero-length
trajectories, but it looks like numpy may now manage zero-length arrays
differently than it did previousl.

Change-Id: Id4212d0c7ea6efcf47295841c92de3aad79072a5

frc971/control_loops/python/graph.py

diff --git a/frc971/control_loops/python/graph.py b/frc971/control_loops/python/graph.py
index 5f68444..3063bd1 100644
--- a/frc971/control_loops/python/graph.py
+++ b/frc971/control_loops/python/graph.py
@@ -43,7 +43,7 @@
             mypoints.addConstraintsToTrajectory(traj)
             traj.Plan()
             XVA = traj.GetPlanXVA(dT)
-            if len(XVA[0]) > 0:
+            if XVA is not None:
                 self.draw_x_axis(cr, start, height, zero, XVA, end)
                 self.drawVelocity(cr, XVA, start, height, skip, zero, end,
                                   legend_entries)