From 99388a2786ec1e3eb80b01aa9641a9d0e0fd17e8 Mon Sep 17 00:00:00 2001
From: jan <jan@orange.mpxd.net>
Date: Sun, 8 Jan 2017 16:57:27 -0800
Subject: [PATCH] Fix calibrator attempting to draw when it's activated
 (outside of draw() function)

---
 src/Calibrator.java | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/src/Calibrator.java b/src/Calibrator.java
index c3d4d39..3b5dd63 100644
--- a/src/Calibrator.java
+++ b/src/Calibrator.java
@@ -38,12 +38,27 @@ class Calibrator {
 
     void activate() {
         this.active = true;
-        this.drawnScreen = projector.get(0, 0, projector.width, projector.height);
+
+        // Tell the projector that we want to save the state of the screen
+        //  next time it draws
+        ProjectorCommand saveCommand = (ProjectorApplet p) -> {
+            this.drawnScreen = p.get(0, 0, p.width, p.height);
+            return true;
+        };
+        projector.commandQueue.add(saveCommand);
     }
 
     void deactivate() {
-        projector.clear();
-        projector.set(projector.width, 0, this.drawnScreen);
+        // Create a command which will restore the screen to what it
+        //  looked like before we started calibrating
+        ProjectorCommand restore_command = (ProjectorApplet p) -> {
+            p.clear();
+            p.set(0, 0, this.drawnScreen);
+            return true;
+        };
+
+        // Insert the restore command at the front of the queue
+        projector.commandQueue.add(0, restore_command);
         this.active = false;
     }