From 487da05ecacd1c03c58b27d8ef8bd5fd7f85ac88 Mon Sep 17 00:00:00 2001
From: Michal Moskal <michal@moskal.me>
Date: Mon, 9 Jan 2017 10:58:24 +0000
Subject: [PATCH 1/3] Fix for https://github.com/Microsoft/pxt/issues/1057

---
 libs/core/core.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libs/core/core.cpp b/libs/core/core.cpp
index dffb6b2c..eb30e67d 100644
--- a/libs/core/core.cpp
+++ b/libs/core/core.cpp
@@ -76,7 +76,7 @@ namespace Boolean_ {
     }
 
     //%
-    bool bang(bool v) { return !v; }
+    bool bang(int v) { return v == 0; }
 }
 
 namespace Number_ {

From cbc228dca355a52853e249fa9f758fa374f3bd61 Mon Sep 17 00:00:00 2001
From: Peli de Halleux <jhalleux@microsoft.com>
Date: Mon, 9 Jan 2017 14:17:19 -0800
Subject: [PATCH 3/3] negative scroll fix fix for Microsoft/pxt#813

---
 sim/state/ledmatrix.ts | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/sim/state/ledmatrix.ts b/sim/state/ledmatrix.ts
index 5692c852..a62f2df2 100644
--- a/sim/state/ledmatrix.ts
+++ b/sim/state/ledmatrix.ts
@@ -53,9 +53,9 @@ namespace pxsim {
         }
 
         public shiftRight(cols: number) {
-            for (let x = this.width - 1; x <= 0; --x)
+            for (let x = this.width - 1; x >= 0; --x)
                 for (let y = 0; y < 5; ++y)
-                    this.set(x, y, x > cols ? this.get(x - cols, y) : 0);
+                    this.set(x, y, x >= cols ? this.get(x - cols, y) : 0);
         }
 
         public clear(): void {
@@ -195,11 +195,16 @@ namespace pxsim.ImageMethods {
         board().ledMatrixState.animationQ.enqueue({
             interval: interval,
             frame: () => {
-                //TODO: support right to left.
                 if (off >= leds.width || off < 0) return false;
-                stride > 0 ? display.shiftLeft(stride) : display.shiftRight(-stride);
-                let c = Math.min(stride, leds.width - off);
-                leds.copyTo(off, c, display, 5 - stride)
+                if (stride > 0) {
+                    display.shiftLeft(stride);
+                    const c = Math.min(stride, leds.width - off);
+                    leds.copyTo(off, c, display, 5 - stride)
+                } else {
+                    display.shiftRight(-stride);
+                    const c = Math.min(-stride, leds.width - off);
+                    leds.copyTo(off, c, display, 0)
+                }
                 off += stride;
                 return true;
             },