From aa585236b844620713e66f3042a2f3524b763441 Mon Sep 17 00:00:00 2001
From: Wouter R <gennerate@zonnet.nl>
Date: Wed, 11 Dec 2013 22:21:05 +0100
Subject: [PATCH] =?UTF-8?q?Fix=20prev=20button=20behaviour,=20fixes=20http?=
 =?UTF-8?q?s://github.com/Doodle3D/doodle3d-client/issues/117.=20Clear=20p?=
 =?UTF-8?q?review=20when=20all=20points=20have=20been=20=E2=80=98oopsed?=
 =?UTF-8?q?=E2=80=99=20away,=20fixes=20https://github.com/Doodle3D/doodle3?=
 =?UTF-8?q?d-client/issues/123.?=
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---
 js_src/previewRendering.js | 7 +++++--
 js_src/sketches.js         | 2 +-
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/js_src/previewRendering.js b/js_src/previewRendering.js
index c28314b..30ce9dd 100644
--- a/js_src/previewRendering.js
+++ b/js_src/previewRendering.js
@@ -83,7 +83,10 @@ var debug_redrawSimplification = 6;
 function redrawPreview(redrawLess) {
   if (redrawLess == undefined) redrawLess = false;
 
-  if (_points.length < 2) return;
+  if (_points.length < 2) {
+	  previewCtx.clearRect(0, 0, preview.width, preview.height);
+	  return;
+  }
 
   if (!redrawLess) {
     //debug_redrawSimplification = Math.round(_points.length / 65);
@@ -345,4 +348,4 @@ function updatePreview(_x, _y, redrawLess) {
   updatePrevY = _y;
 
 }
-//*/
\ No newline at end of file
+//*/
diff --git a/js_src/sketches.js b/js_src/sketches.js
index aecc9c5..a376ff3 100644
--- a/js_src/sketches.js
+++ b/js_src/sketches.js
@@ -54,7 +54,7 @@ function setCurrentSketchId(sId) {
 }
 
 function updatePrevNextButtonStateOnClear() {
-	enableButton(btnPrevious, prevDoodle);
+	if (numSavedSketches > 0) enableButton(btnPrevious, prevDoodle);
 	disableButton(btnNext);
 	currentSketchId = numSavedSketches+1; //after the end of the list
 	disableButton(btnSave);