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src/ClickGetter.java

@@ -1,3 +1,7 @@
+/*
+    Interface for handling mouse clicks
+ */
+
 public interface ClickGetter {
     boolean click(int mouseX, int mouseY);
 }

src/EuglenaApplet.java

@@ -4,9 +4,10 @@ import processing.core.*;
 public class EuglenaApplet extends PApplet {
     /*
         This is the main Processing applet.
+        This applet draws the main window and menu
      */
 
-    final int cameraMode = 9;
+    final int cameraMode = 8;
     final int whichArduino = 0;
 
     // Hardware

src/LEDControl.java

@@ -3,6 +3,10 @@ import static processing.core.PApplet.*;
 import cc.arduino.*;
 
 class LEDControl {
+    /*
+        LED controller
+     */
+
     final int comRate = 57600;
 
     Arduino arduino;

src/Line.java

@@ -3,6 +3,10 @@ import static processing.core.PApplet.*;
 
 
 class Line {
+  /*
+    Class representing a line
+   */
+
   float x1, y1, x2, y2;
   int color, brushSize;
   boolean visible;
@@ -31,6 +35,14 @@ class Line {
 
 
   ProjectorCommand makeProjectorCommand() {
+    /*
+      Create a ProjectorCommand which draws ourselves!
+
+      The ```(arg) -> {my(); commands(); here(); return v}``` syntax creates a
+       "closure", which is just a function that we write on-the-fly and
+       store for later use.
+     */
+
     return (ProjectorApplet p) -> {
       if (!visible) {
         //done drawing already
@@ -54,6 +66,11 @@ class Line {
   }
 
   ClickGetter makeClickGetter(ProjectorApplet p) {
+    /*
+      Create a ClickGetter which can accept incoming mouse clicks
+      and use them to update ourselves.
+     */
+
     return (int x, int y) -> {
       if (!point1complete){
         x1 = x;

src/Menu.java

@@ -3,6 +3,10 @@ import static processing.core.PApplet.*;
 import controlP5.*;
 
 class Menu {
+    /*
+        Right-side menu
+     */
+
     final int width = 200; // Width of toolbar on left side of display
 
     EuglenaApplet parent;
@@ -189,6 +193,11 @@ class Menu {
     }
 
     void controlEvent(ControlEvent theEvent) {
+        /*
+            Handle a controlEvent -- controlP5 generates these events anytime
+             a menu item is clicked.
+         */
+
         //println(theEvent);
         if (theEvent.isFrom(shapesList)) {
             switch((int) shapesList.getValue()) {

src/ProjectorCommand.java

@@ -1,3 +1,21 @@
+/*
+    This file defines the ProjectorCommand interface.
+
+    It says, "if you want a class you wrote to also be a ProjectorCommand,
+    it must have a method ```run``` which takes a ProjectorApplet and
+    returns a boolean".
+
+    You can quickly make a ProjectorCommand by using the syntax
+
+     yourLocalVariable = 5;
+     ProjectorCommand yourCommand = (ProjectorApplet p) -> {
+        your(yourLocalVariable);
+        code();
+        here();
+    }
+    return yourCommand;
+ */
+
 public interface ProjectorCommand {
     boolean run(ProjectorApplet p) throws ProjectorCommandException;
 }