.

projects/11/Square/Main.jack

@@ -0,0 +1,17 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/11/Square/Main.jack
+
+// (same as projects/09/Square/Main.jack)
+
+/** Initializes a new Square Dance game and starts running it. */
+class Main {
+    function void main() {
+        var SquareGame game;
+        let game = SquareGame.new();
+        do game.run();
+        do game.dispose();
+        return;
+    }
+}

projects/11/Square/Main.vm

@@ -0,0 +1,11 @@
+function Main.main 1
+call SquareGame.new 0
+pop local 0
+push local 0
+call SquareGame.run 1
+pop temp 0
+push local 0
+call SquareGame.dispose 1
+pop temp 0
+push constant 0
+return

projects/11/Square/Square.jack

@@ -0,0 +1,110 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/11/Square/Square.jack
+
+// (same as projects/09/Square/Square.jack)
+
+/** Implements a graphical square. */
+class Square {
+
+   field int x, y; // screen location of the square's top-left corner
+   field int size; // length of this square, in pixels
+
+   /** Constructs a new square with a given location and size. */
+   constructor Square new(int Ax, int Ay, int Asize) {
+      let x = Ax;
+      let y = Ay;
+      let size = Asize;
+      do draw();
+      return this;
+   }
+
+   /** Disposes this square. */
+   method void dispose() {
+      do Memory.deAlloc(this);
+      return;
+   }
+
+   /** Draws the square on the screen. */
+   method void draw() {
+      do Screen.setColor(true);
+      do Screen.drawRectangle(x, y, x + size, y + size);
+      return;
+   }
+
+   /** Erases the square from the screen. */
+   method void erase() {
+      do Screen.setColor(false);
+      do Screen.drawRectangle(x, y, x + size, y + size);
+      return;
+   }
+
+    /** Increments the square size by 2 pixels. */
+   method void incSize() {
+      if (((y + size) < 254) & ((x + size) < 510)) {
+         do erase();
+         let size = size + 2;
+         do draw();
+      }
+      return;
+   }
+
+   /** Decrements the square size by 2 pixels. */
+   method void decSize() {
+      if (size > 2) {
+         do erase();
+         let size = size - 2;
+         do draw();
+      }
+      return;
+   }
+
+   /** Moves the square up by 2 pixels. */
+   method void moveUp() {
+      if (y > 1) {
+         do Screen.setColor(false);
+         do Screen.drawRectangle(x, (y + size) - 1, x + size, y + size);
+         let y = y - 2;
+         do Screen.setColor(true);
+         do Screen.drawRectangle(x, y, x + size, y + 1);
+      }
+      return;
+   }
+
+   /** Moves the square down by 2 pixels. */
+   method void moveDown() {
+      if ((y + size) < 254) {
+         do Screen.setColor(false);
+         do Screen.drawRectangle(x, y, x + size, y + 1);
+         let y = y + 2;
+         do Screen.setColor(true);
+         do Screen.drawRectangle(x, (y + size) - 1, x + size, y + size);
+      }
+      return;
+   }
+
+   /** Moves the square left by 2 pixels. */
+   method void moveLeft() {
+      if (x > 1) {
+         do Screen.setColor(false);
+         do Screen.drawRectangle((x + size) - 1, y, x + size, y + size);
+         let x = x - 2;
+         do Screen.setColor(true);
+         do Screen.drawRectangle(x, y, x + 1, y + size);
+      }
+      return;
+   }
+
+   /** Moves the square right by 2 pixels. */
+   method void moveRight() {
+      if ((x + size) < 510) {
+         do Screen.setColor(false);
+         do Screen.drawRectangle(x, y, x + 1, y + size);
+         let x = x + 2;
+         do Screen.setColor(true);
+         do Screen.drawRectangle((x + size) - 1, y, x + size, y + size);
+      }
+      return;
+   }
+}

projects/11/Square/Square.vm

@@ -0,0 +1,310 @@
+function Square.new 0
+push constant 3
+call Memory.alloc 1
+pop pointer 0
+push argument 0
+pop this 0
+push argument 1
+pop this 1
+push argument 2
+pop this 2
+push pointer 0
+call Square.draw 1
+pop temp 0
+push pointer 0
+return
+function Square.dispose 0
+push argument 0
+pop pointer 0
+push pointer 0
+call Memory.deAlloc 1
+pop temp 0
+push constant 0
+return
+function Square.draw 0
+push argument 0
+pop pointer 0
+push constant 1
+neg
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 1
+push this 0
+push this 2
+add
+push this 1
+push this 2
+add
+call Screen.drawRectangle 4
+pop temp 0
+push constant 0
+return
+function Square.erase 0
+push argument 0
+pop pointer 0
+push constant 0
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 1
+push this 0
+push this 2
+add
+push this 1
+push this 2
+add
+call Screen.drawRectangle 4
+pop temp 0
+push constant 0
+return
+function Square.incSize 0
+push argument 0
+pop pointer 0
+push this 1
+push this 2
+add
+push constant 254
+lt
+push this 0
+push this 2
+add
+push constant 510
+lt
+and
+not
+if-goto L0
+push pointer 0
+call Square.erase 1
+pop temp 0
+push this 2
+push constant 2
+add
+pop this 2
+push pointer 0
+call Square.draw 1
+pop temp 0
+goto L1
+label L0
+label L1
+push constant 0
+return
+function Square.decSize 0
+push argument 0
+pop pointer 0
+push this 2
+push constant 2
+gt
+not
+if-goto L2
+push pointer 0
+call Square.erase 1
+pop temp 0
+push this 2
+push constant 2
+sub
+pop this 2
+push pointer 0
+call Square.draw 1
+pop temp 0
+goto L3
+label L2
+label L3
+push constant 0
+return
+function Square.moveUp 0
+push argument 0
+pop pointer 0
+push this 1
+push constant 1
+gt
+not
+if-goto L4
+push constant 0
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 1
+push this 2
+add
+push constant 1
+sub
+push this 0
+push this 2
+add
+push this 1
+push this 2
+add
+call Screen.drawRectangle 4
+pop temp 0
+push this 1
+push constant 2
+sub
+pop this 1
+push constant 1
+neg
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 1
+push this 0
+push this 2
+add
+push this 1
+push constant 1
+add
+call Screen.drawRectangle 4
+pop temp 0
+goto L5
+label L4
+label L5
+push constant 0
+return
+function Square.moveDown 0
+push argument 0
+pop pointer 0
+push this 1
+push this 2
+add
+push constant 254
+lt
+not
+if-goto L6
+push constant 0
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 1
+push this 0
+push this 2
+add
+push this 1
+push constant 1
+add
+call Screen.drawRectangle 4
+pop temp 0
+push this 1
+push constant 2
+add
+pop this 1
+push constant 1
+neg
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 1
+push this 2
+add
+push constant 1
+sub
+push this 0
+push this 2
+add
+push this 1
+push this 2
+add
+call Screen.drawRectangle 4
+pop temp 0
+goto L7
+label L6
+label L7
+push constant 0
+return
+function Square.moveLeft 0
+push argument 0
+pop pointer 0
+push this 0
+push constant 1
+gt
+not
+if-goto L8
+push constant 0
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 2
+add
+push constant 1
+sub
+push this 1
+push this 0
+push this 2
+add
+push this 1
+push this 2
+add
+call Screen.drawRectangle 4
+pop temp 0
+push this 0
+push constant 2
+sub
+pop this 0
+push constant 1
+neg
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 1
+push this 0
+push constant 1
+add
+push this 1
+push this 2
+add
+call Screen.drawRectangle 4
+pop temp 0
+goto L9
+label L8
+label L9
+push constant 0
+return
+function Square.moveRight 0
+push argument 0
+pop pointer 0
+push this 0
+push this 2
+add
+push constant 510
+lt
+not
+if-goto L10
+push constant 0
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 1
+push this 0
+push constant 1
+add
+push this 1
+push this 2
+add
+call Screen.drawRectangle 4
+pop temp 0
+push this 0
+push constant 2
+add
+pop this 0
+push constant 1
+neg
+call Screen.setColor 1
+pop temp 0
+push this 0
+push this 2
+add
+push constant 1
+sub
+push this 1
+push this 0
+push this 2
+add
+push this 1
+push this 2
+add
+call Screen.drawRectangle 4
+pop temp 0
+goto L11
+label L10
+label L11
+push constant 0
+return

projects/11/Square/SquareGame.jack

@@ -0,0 +1,81 @@
+// This file is part of www.nand2tetris.org
+// and the book "The Elements of Computing Systems"
+// by Nisan and Schocken, MIT Press.
+// File name: projects/11/Square/SquareGame.jack
+
+// (same as projects/09/Square/SquareGame.jack)
+
+/**
+ * Implements the Square Dance game.
+ * This simple game allows the user to move a black square around
+ * the screen, and change the square's size during the movement.
+ * When the game starts, a square of 30 by 30 pixels is shown at the
+ * top-left corner of the screen. The user controls the square as follows.
+ * The 4 arrow keys are used to move the square up, down, left, and right.
+ * The 'z' and 'x' keys are used, respectively, to decrement and increment
+ * the square's size. The 'q' key is used to quit the game.
+ */
+
+class SquareGame {
+   field Square square; // the square of this game
+   field int direction; // the square's current direction: 
+                        // 0=none, 1=up, 2=down, 3=left, 4=right
+
+   /** Constructs a new Square Game. */
+   constructor SquareGame new() {
+      // Creates a 30 by 30 pixels square and positions it at the top-left
+      // of the screen.
+      let square = Square.new(0, 0, 30);
+      let direction = 0;  // initial state is no movement
+      return this;
+   }
+
+   /** Disposes this game. */
+   method void dispose() {
+      do square.dispose();
+      do Memory.deAlloc(this);
+      return;
+   }
+
+   /** Moves the square in the current direction. */
+   method void moveSquare() {
+      if (direction = 1) { do square.moveUp(); }
+      if (direction = 2) { do square.moveDown(); }
+      if (direction = 3) { do square.moveLeft(); }
+      if (direction = 4) { do square.moveRight(); }
+      do Sys.wait(5);  // delays the next movement
+      return;
+   }
+
+   /** Runs the game: handles the user's inputs and moves the square accordingly */
+   method void run() {
+      var char key;  // the key currently pressed by the user
+      var boolean exit;
+      let exit = false;
+      
+      while (~exit) {
+         // waits for a key to be pressed
+         while (key = 0) {
+            let key = Keyboard.keyPressed();
+            do moveSquare();
+         }
+         if (key = 81)  { let exit = true; }     // q key
+         if (key = 90)  { do square.decSize(); } // z key
+         if (key = 88)  { do square.incSize(); } // x key
+         if (key = 131) { let direction = 1; }   // up arrow
+         if (key = 133) { let direction = 2; }   // down arrow
+         if (key = 130) { let direction = 3; }   // left arrow
+         if (key = 132) { let direction = 4; }   // right arrow
+
+         // waits for the key to be released
+         while (~(key = 0)) {
+            let key = Keyboard.keyPressed();
+            do moveSquare();
+         }
+     } // while
+     return;
+   }
+}
+
+
+

projects/11/Square/SquareGame.vm

@@ -0,0 +1,190 @@
+function SquareGame.new 0
+push constant 2
+call Memory.alloc 1
+pop pointer 0
+push constant 0
+push constant 0
+push constant 30
+call Square.new 3
+pop this 0
+push constant 0
+pop this 1
+push pointer 0
+return
+function SquareGame.dispose 0
+push argument 0
+pop pointer 0
+push this 0
+call Square.dispose 1
+pop temp 0
+push pointer 0
+call Memory.deAlloc 1
+pop temp 0
+push constant 0
+return
+function SquareGame.moveSquare 0
+push argument 0
+pop pointer 0
+push this 1
+push constant 1
+eq
+not
+if-goto L0
+push this 0
+call Square.moveUp 1
+pop temp 0
+goto L1
+label L0
+label L1
+push this 1
+push constant 2
+eq
+not
+if-goto L2
+push this 0
+call Square.moveDown 1
+pop temp 0
+goto L3
+label L2
+label L3
+push this 1
+push constant 3
+eq
+not
+if-goto L4
+push this 0
+call Square.moveLeft 1
+pop temp 0
+goto L5
+label L4
+label L5
+push this 1
+push constant 4
+eq
+not
+if-goto L6
+push this 0
+call Square.moveRight 1
+pop temp 0
+goto L7
+label L6
+label L7
+push constant 5
+call Sys.wait 1
+pop temp 0
+push constant 0
+return
+function SquareGame.run 2
+push argument 0
+pop pointer 0
+push constant 0
+pop local 1
+label L8
+push local 1
+not
+not
+if-goto L9
+label L10
+push local 0
+push constant 0
+eq
+not
+if-goto L11
+call Keyboard.keyPressed 0
+pop local 0
+push pointer 0
+call SquareGame.moveSquare 1
+pop temp 0
+goto L10
+label L11
+push local 0
+push constant 81
+eq
+not
+if-goto L12
+push constant 1
+neg
+pop local 1
+goto L13
+label L12
+label L13
+push local 0
+push constant 90
+eq
+not
+if-goto L14
+push this 0
+call Square.decSize 1
+pop temp 0
+goto L15
+label L14
+label L15
+push local 0
+push constant 88
+eq
+not
+if-goto L16
+push this 0
+call Square.incSize 1
+pop temp 0
+goto L17
+label L16
+label L17
+push local 0
+push constant 131
+eq
+not
+if-goto L18
+push constant 1
+pop this 1
+goto L19
+label L18
+label L19
+push local 0
+push constant 133
+eq
+not
+if-goto L20
+push constant 2
+pop this 1
+goto L21
+label L20
+label L21
+push local 0
+push constant 130
+eq
+not
+if-goto L22
+push constant 3
+pop this 1
+goto L23
+label L22
+label L23
+push local 0
+push constant 132
+eq
+not
+if-goto L24
+push constant 4
+pop this 1
+goto L25
+label L24
+label L25
+label L26
+push local 0
+push constant 0
+eq
+not
+not
+if-goto L27
+call Keyboard.keyPressed 0
+pop local 0
+push pointer 0
+call SquareGame.moveSquare 1
+pop temp 0
+goto L26
+label L27
+goto L8
+label L9
+push constant 0
+return