From 0b3bf9bc9f8be4f14458e402a61bc5cc4a4b00df Mon Sep 17 00:00:00 2001
From: Josh Pieper <jjp@pobox.com>
Date: Mon, 22 Jun 2020 13:56:38 -0400
Subject: [PATCH] Only display non-empty legends

---
 implot.cpp | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/implot.cpp b/implot.cpp
index 21bd171..c02f47f 100644
--- a/implot.cpp
+++ b/implot.cpp
@@ -628,9 +628,11 @@ ImPlotItem* RegisterItem(const char* label_id) {
     item->SeenThisFrame = true;
     int idx = gp.CurrentPlot->Items.GetIndex(item);
     item->ID = id;
-    gp.LegendIndices.push_back(idx);
-    item->NameOffset = gp.LegendLabels.size();
-    gp.LegendLabels.append(label_id, label_id + strlen(label_id) + 1);
+    if (ImGui::FindRenderedTextEnd(label_id, NULL) != label_id) {
+        gp.LegendIndices.push_back(idx);
+        item->NameOffset = gp.LegendLabels.size();
+        gp.LegendLabels.append(label_id, label_id + strlen(label_id) + 1);
+    }
     if (item->Show)
         gp.VisibleItemCount++;
     return item;