From 7d5eaffa89210171fabf744f3d59b8379fcc34af Mon Sep 17 00:00:00 2001
From: phkahler <14852918+phkahler@users.noreply.github.com>
Date: Sun, 19 Jun 2022 17:53:48 -0400
Subject: [PATCH] Add ability to select 3 faces

---
 src/describescreen.cpp | 20 ++++++++++++++++++++
 src/draw.cpp           |  4 ++--
 2 files changed, 22 insertions(+), 2 deletions(-)

diff --git a/src/describescreen.cpp b/src/describescreen.cpp
index db527493..021f2661 100644
--- a/src/describescreen.cpp
+++ b/src/describescreen.cpp
@@ -428,6 +428,26 @@ void TextWindow::DescribeSelection() {
             double d = (p1.Minus(p0)).Dot(n0);
             Printf(true,  "      distance = %Fi%s", SS.MmToString(d).c_str());
         }
+    } else if(gs.n == 3 && gs.faces == 3) {
+        Printf(false, "%FtTHREE PLANE FACES");
+
+        Vector n0 = SK.GetEntity(gs.face[0])->FaceGetNormalNum();
+        Printf(true,  " planeA normal = " PT_AS_NUM, CO(n0));
+        Vector p0 = SK.GetEntity(gs.face[0])->FaceGetPointNum();
+        Printf(false, "   planeA thru = " PT_AS_STR, COSTR(SK.GetEntity(gs.face[0]), p0));
+
+        Vector n1 = SK.GetEntity(gs.face[1])->FaceGetNormalNum();
+        Printf(true,  " planeB normal = " PT_AS_NUM, CO(n1));
+        Vector p1 = SK.GetEntity(gs.face[1])->FaceGetPointNum();
+        Printf(false, "   planeB thru = " PT_AS_STR, COSTR(SK.GetEntity(gs.face[1]), p1));
+
+        Vector n2 = SK.GetEntity(gs.face[2])->FaceGetNormalNum();
+        Printf(true,  " planeC normal = " PT_AS_NUM, CO(n2));
+        Vector p2 = SK.GetEntity(gs.face[2])->FaceGetPointNum();
+        Printf(false, "   planeB thru = " PT_AS_STR, COSTR(SK.GetEntity(gs.face[2]), p2));
+
+        // We should probably compute and show the intersection point if there is onw.
+
     } else if(gs.n == 0 && gs.constraints == 1) {
         Constraint *c = SK.GetConstraint(gs.constraint[0]);
         const std::string &desc = c->DescriptionString().c_str();
diff --git a/src/draw.cpp b/src/draw.cpp
index 3610f201..344c5d61 100644
--- a/src/draw.cpp
+++ b/src/draw.cpp
@@ -185,7 +185,7 @@ void GraphicsWindow::MakeSelected(Selection *stog) {
 
     if(stog->entity.v != 0 && SK.GetEntity(stog->entity)->IsFace()) {
         // In the interest of speed for the triangle drawing code,
-        // only two faces may be selected at a time.
+        // only three faces may be selected at a time.
         int c = 0;
         Selection *s;
         selection.ClearTags();
@@ -193,7 +193,7 @@ void GraphicsWindow::MakeSelected(Selection *stog) {
             hEntity he = s->entity;
             if(he.v != 0 && SK.GetEntity(he)->IsFace()) {
                 c++;
-                if(c >= 2) s->tag = 1;
+                if(c >= 3) s->tag = 1;
             }
         }
         selection.RemoveTagged();