From 37795d24ba7ceac754e2acc4911cdcd7e9ef96ad Mon Sep 17 00:00:00 2001
From: Jonathan Westhues <jwesthues@cq.cx>
Date: Sun, 4 Jan 2009 04:39:55 -0800
Subject: [PATCH] Don't let the user create workplanes locked in another
 workplane; that is almost surely a mistake.

[git-p4: depot-paths = "//depot/solvespace/": change = 1888]
---
 draw.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/draw.cpp b/draw.cpp
index cdfc13df..54f24380 100644
--- a/draw.cpp
+++ b/draw.cpp
@@ -467,6 +467,12 @@ void GraphicsWindow::MouseLeftDown(double mx, double my) {
             break;
 
         case MNU_WORKPLANE:
+            if(LockedInWorkplane()) {
+                Error("Sketching in a workplane already; sketch in 3d before "
+                      "creating new workplane.");
+                ClearSuper();
+                break;
+            }
             hr = AddRequest(Request::WORKPLANE);
             SS.GetEntity(hr.entity(1))->PointForceTo(v);
             SS.GetEntity(hr.entity(32))->NormalForceTo(