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-rw-r--r--projects/11/Square/Main.jack17
-rw-r--r--projects/11/Square/Square.jack110
-rw-r--r--projects/11/Square/SquareGame.jack81
3 files changed, 208 insertions, 0 deletions
diff --git a/projects/11/Square/Main.jack b/projects/11/Square/Main.jack
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+++ b/projects/11/Square/Main.jack
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+// 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;
+ }
+}
diff --git a/projects/11/Square/Square.jack b/projects/11/Square/Square.jack
new file mode 100644
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+++ b/projects/11/Square/Square.jack
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+// 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;
+ }
+}
diff --git a/projects/11/Square/SquareGame.jack b/projects/11/Square/SquareGame.jack
new file mode 100644
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--- /dev/null
+++ b/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;
+ }
+}
+
+
+