From 9224b6e2ce9747f09d154be2117a43f0d14511ac Mon Sep 17 00:00:00 2001
From: Justin Berger <j.david.berger@gmail.com>
Date: Mon, 7 May 2018 10:39:01 -0600
Subject: Added basic checks for using viz tool as library

---
 tools/viz/survive_viewer.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/tools/viz/survive_viewer.js b/tools/viz/survive_viewer.js
index 56ef47f..cbd4fce 100644
--- a/tools/viz/survive_viewer.js
+++ b/tools/viz/survive_viewer.js
@@ -49,6 +49,9 @@ function add_lighthouse(idx, p, q) {
 	}
 
 function recolorTrackers(when) {
+    if(ctx == undefined)
+	return;
+    
 	for (var key in angles) {
 		var colors = [];
 
@@ -501,6 +504,6 @@ function animate() {
 	}
 
 function render() {
-	var use_fpv = $("#fpv")[0].checked;
+	var use_fpv = $("#fpv").length > 0 && $("#fpv")[0].checked;
 	renderer.render(scene, use_fpv ? fpv_camera : camera);
 }
-- 
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