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Diffstat (limited to 'projects/11/Pong/PongGame.jack')
| -rw-r--r-- | projects/11/Pong/PongGame.jack | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/projects/11/Pong/PongGame.jack b/projects/11/Pong/PongGame.jack new file mode 100644 index 0000000..7e1ae4c --- /dev/null +++ b/projects/11/Pong/PongGame.jack @@ -0,0 +1,137 @@ +// 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/Pong/PongGame.jack
+
+/**
+ * Represents a Pong game.
+ */
+class PongGame {
+
+ static PongGame instance; // the singelton, a Pong game instance
+ field Bat bat; // the bat
+ field Ball ball; // the ball
+ field int wall; // the current wall that the ball is bouncing off of.
+ field boolean exit; // true when the game is over
+ field int score; // the current score.
+ field int lastWall; // the last wall that the ball bounced off of.
+
+ // The current width of the bat
+ field int batWidth;
+
+ /** Constructs a new Pong game. */
+ constructor PongGame new() {
+ do Screen.clearScreen();
+ let batWidth = 50; // initial bat size
+ let bat = Bat.new(230, 229, batWidth, 7);
+ let ball = Ball.new(253, 222, 0, 511, 0, 229);
+ do ball.setDestination(400,0);
+ do Screen.drawRectangle(0, 238, 511, 240);
+ do Output.moveCursor(22,0);
+ do Output.printString("Score: 0");
+
+ let exit = false;
+ let score = 0;
+ let wall = 0;
+ let lastWall = 0;
+
+ return this;
+ }
+
+ /** Deallocates the object's memory. */
+ method void dispose() {
+ do bat.dispose();
+ do ball.dispose();
+ do Memory.deAlloc(this);
+ return;
+ }
+
+ /** Creates an instance of Pong game, and stores it. */
+ function void newInstance() {
+ let instance = PongGame.new();
+ return;
+ }
+
+ /** Returns the single instance of this Pong game. */
+ function PongGame getInstance() {
+ return instance;
+ }
+
+ /** Starts the game, and andles inputs from the user that control
+ * the bat's movement direction. */
+ method void run() {
+ var char key;
+
+ while (~exit) {
+ // waits for a key to be pressed.
+ while ((key = 0) & (~exit)) {
+ let key = Keyboard.keyPressed();
+ do bat.move();
+ do moveBall();
+ do Sys.wait(50);
+ }
+
+ if (key = 130) { do bat.setDirection(1); }
+ else {
+ if (key = 132) { do bat.setDirection(2); }
+ else {
+ if (key = 140) { let exit = true; }
+ }
+ }
+
+ // Waits for the key to be released.
+ while ((~(key = 0)) & (~exit)) {
+ let key = Keyboard.keyPressed();
+ do bat.move();
+ do moveBall();
+ do Sys.wait(50);
+ }
+ }
+
+ if (exit) {
+ do Output.moveCursor(10,27);
+ do Output.printString("Game Over");
+ }
+
+ return;
+ }
+
+ /**
+ * Handles ball movement, including bouncing.
+ * If the ball bounces off a wall, finds its new direction.
+ * If the ball bounces off the bat, increases the score by one
+ * and shrinks the bat's size, to make the game more challenging.
+ */
+ method void moveBall() {
+ var int bouncingDirection, batLeft, batRight, ballLeft, ballRight;
+
+ let wall = ball.move();
+
+ if ((wall > 0) & (~(wall = lastWall))) {
+ let lastWall = wall;
+ let bouncingDirection = 0;
+ let batLeft = bat.getLeft();
+ let batRight = bat.getRight();
+ let ballLeft = ball.getLeft();
+ let ballRight = ball.getRight();
+
+ if (wall = 4) {
+ let exit = (batLeft > ballRight) | (batRight < ballLeft);
+ if (~exit) {
+ if (ballRight < (batLeft + 10)) { let bouncingDirection = -1; }
+ else {
+ if (ballLeft > (batRight - 10)) { let bouncingDirection = 1; }
+ }
+
+ let batWidth = batWidth - 2;
+ do bat.setWidth(batWidth);
+ let score = score + 1;
+ do Output.moveCursor(22,7);
+ do Output.printInt(score);
+ }
+ }
+ do ball.bounce(bouncingDirection);
+ }
+ return;
+ }
+}
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