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QkoSad
2025-07-16 13:00:37 +03:00
commit 7894b48931
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projects/11/Pong/Ball.jack
Executable
+203
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@@ -0,0 +1,203 @@
// 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/Ball.jack
/**
* A graphical ball. Characterized by a screen location and distance of
* last destination. Has methods for drawing, erasing and moving on the screen.
* The ball is displayed as a filled, 6-by-6 pixles rectangle.
*/
class Ball {
field int x, y; // the ball's screen location (in pixels)
field int lengthx, lengthy; // distance of last destination (in pixels)
field int d, straightD, diagonalD; // used for straight line movement computation
field boolean invert, positivex, positivey; // (same)
field int leftWall, rightWall, topWall, bottomWall; // wall locations
field int wall; // last wall that the ball was bounced off of
/** Constructs a new ball with the given initial location and wall locations. */
constructor Ball new(int Ax, int Ay,
int AleftWall, int ArightWall, int AtopWall, int AbottomWall) {
let x = Ax;
let y = Ay;
let leftWall = AleftWall;
let rightWall = ArightWall - 6; // -6 for ball size
let topWall = AtopWall;
let bottomWall = AbottomWall - 6; // -6 for ball size
let wall = 0;
do show();
return this;
}
/** Deallocates the Ball's memory. */
method void dispose() {
do Memory.deAlloc(this);
return;
}
/** Shows the ball. */
method void show() {
do Screen.setColor(true);
do draw();
return;
}
/** Hides the ball. */
method void hide() {
do Screen.setColor(false);
do draw();
return;
}
/** Draws the ball. */
method void draw() {
do Screen.drawRectangle(x, y, x + 5, y + 5);
return;
}
/** Returns the ball's left edge. */
method int getLeft() {
return x;
}
/** Returns the ball's right edge. */
method int getRight() {
return x + 5;
}
/** Computes and sets the ball's destination. */
method void setDestination(int destx, int desty) {
var int dx, dy, temp;
let lengthx = destx - x;
let lengthy = desty - y;
let dx = Math.abs(lengthx);
let dy = Math.abs(lengthy);
let invert = (dx < dy);
if (invert) {
let temp = dx; // swap dx, dy
let dx = dy;
let dy = temp;
let positivex = (y < desty);
let positivey = (x < destx);
}
else {
let positivex = (x < destx);
let positivey = (y < desty);
}
let d = (2 * dy) - dx;
let straightD = 2 * dy;
let diagonalD = 2 * (dy - dx);
return;
}
/**
* Moves the ball one unit towards its destination.
* If the ball has reached a wall, returns 0.
* Else, returns a value according to the wall:
* 1 (left wall), 2 (right wall), 3 (top wall), 4 (bottom wall).
*/
method int move() {
do hide();
if (d < 0) { let d = d + straightD; }
else {
let d = d + diagonalD;
if (positivey) {
if (invert) { let x = x + 4; }
else { let y = y + 4; }
}
else {
if (invert) { let x = x - 4; }
else { let y = y - 4; }
}
}
if (positivex) {
if (invert) { let y = y + 4; }
else { let x = x + 4; }
}
else {
if (invert) { let y = y - 4; }
else { let x = x - 4; }
}
if (~(x > leftWall)) {
let wall = 1;
let x = leftWall;
}
if (~(x < rightWall)) {
let wall = 2;
let x = rightWall;
}
if (~(y > topWall)) {
let wall = 3;
let y = topWall;
}
if (~(y < bottomWall)) {
let wall = 4;
let y = bottomWall;
}
do show();
return wall;
}
/**
* Bounces off the current wall: sets the new destination
* of the ball according to the ball's angle and the given
* bouncing direction (-1/0/1=left/center/right or up/center/down).
*/
method void bounce(int bouncingDirection) {
var int newx, newy, divLengthx, divLengthy, factor;
// dividing by 10 first since results are too big
let divLengthx = lengthx / 10;
let divLengthy = lengthy / 10;
if (bouncingDirection = 0) { let factor = 10; }
else {
if (((~(lengthx < 0)) & (bouncingDirection = 1)) | ((lengthx < 0) & (bouncingDirection = (-1)))) {
let factor = 20; // bounce direction is in ball direction
}
else { let factor = 5; } // bounce direction is against ball direction
}
if (wall = 1) {
let newx = 506;
let newy = (divLengthy * (-50)) / divLengthx;
let newy = y + (newy * factor);
}
else {
if (wall = 2) {
let newx = 0;
let newy = (divLengthy * 50) / divLengthx;
let newy = y + (newy * factor);
}
else {
if (wall = 3) {
let newy = 250;
let newx = (divLengthx * (-25)) / divLengthy;
let newx = x + (newx * factor);
}
else { // assumes wall = 4
let newy = 0;
let newx = (divLengthx * 25) / divLengthy;
let newx = x + (newx * factor);
}
}
}
do setDestination(newx, newy);
return;
}
}
projects/11/Pong/Ball.vm
Executable
+435
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@@ -0,0 +1,435 @@
function Ball.new 0
push constant 15
call Memory.alloc 1
pop pointer 0
push argument 0
pop this 0
push argument 1
pop this 1
push argument 2
pop this 10
push argument 3
push constant 6
sub
pop this 11
push argument 4
pop this 12
push argument 5
push constant 6
sub
pop this 13
push constant 0
pop this 14
push pointer 0
call Ball.show 1
pop temp 0
push pointer 0
return
function Ball.dispose 0
push argument 0
pop pointer 0
push pointer 0
call Memory.deAlloc 1
pop temp 0
push constant 0
return
function Ball.show 0
push argument 0
pop pointer 0
push constant 1
neg
call Screen.setColor 1
pop temp 0
push pointer 0
call Ball.draw 1
pop temp 0
push constant 0
return
function Ball.hide 0
push argument 0
pop pointer 0
push constant 0
call Screen.setColor 1
pop temp 0
push pointer 0
call Ball.draw 1
pop temp 0
push constant 0
return
function Ball.draw 0
push argument 0
pop pointer 0
push this 0
push this 1
push this 0
push constant 5
add
push this 1
push constant 5
add
call Screen.drawRectangle 4
pop temp 0
push constant 0
return
function Ball.getLeft 0
push argument 0
pop pointer 0
push this 0
return
function Ball.getRight 0
push argument 0
pop pointer 0
push this 0
push constant 5
add
return
function Ball.setDestination 3
push argument 0
pop pointer 0
push argument 1
push this 0
sub
pop this 2
push argument 2
push this 1
sub
pop this 3
push this 2
call Math.abs 1
pop local 0
push this 3
call Math.abs 1
pop local 1
push local 0
push local 1
lt
pop this 7
push this 7
not
if-goto L0
push local 0
pop local 2
push local 1
pop local 0
push local 2
pop local 1
push this 1
push argument 2
lt
pop this 8
push this 0
push argument 1
lt
pop this 9
goto L1
label L0
push this 0
push argument 1
lt
pop this 8
push this 1
push argument 2
lt
pop this 9
label L1
push constant 2
push local 1
call Math.multiply 2
push local 0
sub
pop this 4
push constant 2
push local 1
call Math.multiply 2
pop this 5
push constant 2
push local 1
push local 0
sub
call Math.multiply 2
pop this 6
push constant 0
return
function Ball.move 0
push argument 0
pop pointer 0
push pointer 0
call Ball.hide 1
pop temp 0
push this 4
push constant 0
lt
not
if-goto L2
push this 4
push this 5
add
pop this 4
goto L3
label L2
push this 4
push this 6
add
pop this 4
push this 9
not
if-goto L4
push this 7
not
if-goto L5
push this 0
push constant 4
add
pop this 0
goto L6
label L5
push this 1
push constant 4
add
pop this 1
label L6
goto L7
label L4
push this 7
not
if-goto L8
push this 0
push constant 4
sub
pop this 0
goto L9
label L8
push this 1
push constant 4
sub
pop this 1
label L9
label L7
label L3
push this 8
not
if-goto L10
push this 7
not
if-goto L11
push this 1
push constant 4
add
pop this 1
goto L12
label L11
push this 0
push constant 4
add
pop this 0
label L12
goto L13
label L10
push this 7
not
if-goto L14
push this 1
push constant 4
sub
pop this 1
goto L15
label L14
push this 0
push constant 4
sub
pop this 0
label L15
label L13
push this 0
push this 10
gt
not
not
if-goto L16
push constant 1
pop this 14
push this 10
pop this 0
goto L17
label L16
label L17
push this 0
push this 11
lt
not
not
if-goto L18
push constant 2
pop this 14
push this 11
pop this 0
goto L19
label L18
label L19
push this 1
push this 12
gt
not
not
if-goto L20
push constant 3
pop this 14
push this 12
pop this 1
goto L21
label L20
label L21
push this 1
push this 13
lt
not
not
if-goto L22
push constant 4
pop this 14
push this 13
pop this 1
goto L23
label L22
label L23
push pointer 0
call Ball.show 1
pop temp 0
push this 14
return
function Ball.bounce 5
push argument 0
pop pointer 0
push this 2
push constant 10
call Math.divide 2
pop local 2
push this 3
push constant 10
call Math.divide 2
pop local 3
push argument 1
push constant 0
eq
not
if-goto L24
push constant 10
pop local 4
goto L25
label L24
push this 2
push constant 0
lt
not
push argument 1
push constant 1
eq
and
push this 2
push constant 0
lt
push argument 1
push constant 1
neg
eq
and
or
not
if-goto L26
push constant 20
pop local 4
goto L27
label L26
push constant 5
pop local 4
label L27
label L25
push this 14
push constant 1
eq
not
if-goto L28
push constant 506
pop local 0
push local 3
push constant 50
neg
call Math.multiply 2
push local 2
call Math.divide 2
pop local 1
push this 1
push local 1
push local 4
call Math.multiply 2
add
pop local 1
goto L29
label L28
push this 14
push constant 2
eq
not
if-goto L30
push constant 0
pop local 0
push local 3
push constant 50
call Math.multiply 2
push local 2
call Math.divide 2
pop local 1
push this 1
push local 1
push local 4
call Math.multiply 2
add
pop local 1
goto L31
label L30
push this 14
push constant 3
eq
not
if-goto L32
push constant 250
pop local 1
push local 2
push constant 25
neg
call Math.multiply 2
push local 3
call Math.divide 2
pop local 0
push this 0
push local 0
push local 4
call Math.multiply 2
add
pop local 0
goto L33
label L32
push constant 0
pop local 1
push local 2
push constant 25
call Math.multiply 2
push local 3
call Math.divide 2
pop local 0
push this 0
push local 0
push local 4
call Math.multiply 2
add
pop local 0
label L33
label L31
label L29
push pointer 0
push local 0
push local 1
call Ball.setDestination 3
pop temp 0
push constant 0
return
projects/11/Pong/Bat.jack
Executable
+103
View File
@@ -0,0 +1,103 @@
// 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/Bat.jack
/**
* A graphical Pong bat.
* Displayed as a filled horizontal rectangle that has
* a screen location, a width and a height.
* Has methods for drawing, erasing, moving left and right,
* and changing its width (to make the hitting action more challenging).
* This class should have been called "paddle", following the
* standard Pong terminology. But, unaware of this terminology,
* we called it "bat", and then decided to stick to it.
*/
class Bat {
field int x, y; // the bat's screen location
field int width, height; // the bat's width and height
field int direction; // direction of the bat's movement (1 = left, 2 = right)
/** Constructs a new bat with the given location and width. */
constructor Bat new(int Ax, int Ay, int Awidth, int Aheight) {
let x = Ax;
let y = Ay;
let width = Awidth;
let height = Aheight;
let direction = 2;
do show();
return this;
}
/** Deallocates the object's memory. */
method void dispose() {
do Memory.deAlloc(this);
return;
}
/** Shows the bat. */
method void show() {
do Screen.setColor(true);
do draw();
return;
}
/** Hides the bat. */
method void hide() {
do Screen.setColor(false);
do draw();
return;
}
/** Draws the bat. */
method void draw() {
do Screen.drawRectangle(x, y, x + width, y + height);
return;
}
/** Sets the bat's direction (0=stop, 1=left, 2=right). */
method void setDirection(int Adirection) {
let direction = Adirection;
return;
}
/** Returns the bat's left edge. */
method int getLeft() {
return x;
}
/** Returns the bat's right edge. */
method int getRight() {
return x + width;
}
/** Sets the bat's width. */
method void setWidth(int Awidth) {
do hide();
let width = Awidth;
do show();
return;
}
/** Moves the bat one step in the bat's direction. */
method void move() {
if (direction = 1) {
let x = x - 4;
if (x < 0) { let x = 0; }
do Screen.setColor(false);
do Screen.drawRectangle((x + width) + 1, y, (x + width) + 4, y + height);
do Screen.setColor(true);
do Screen.drawRectangle(x, y, x + 3, y + height);
}
else {
let x = x + 4;
if ((x + width) > 511) { let x = 511 - width; }
do Screen.setColor(false);
do Screen.drawRectangle(x - 4, y, x - 1, y + height);
do Screen.setColor(true);
do Screen.drawRectangle((x + width) - 3, y, x + width, y + height);
}
return;
}
}
projects/11/Pong/Bat.vm
Executable
+208
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@@ -0,0 +1,208 @@
function Bat.new 0
push constant 5
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 argument 3
pop this 3
push constant 2
pop this 4
push pointer 0
call Bat.show 1
pop temp 0
push pointer 0
return
function Bat.dispose 0
push argument 0
pop pointer 0
push pointer 0
call Memory.deAlloc 1
pop temp 0
push constant 0
return
function Bat.show 0
push argument 0
pop pointer 0
push constant 1
neg
call Screen.setColor 1
pop temp 0
push pointer 0
call Bat.draw 1
pop temp 0
push constant 0
return
function Bat.hide 0
push argument 0
pop pointer 0
push constant 0
call Screen.setColor 1
pop temp 0
push pointer 0
call Bat.draw 1
pop temp 0
push constant 0
return
function Bat.draw 0
push argument 0
pop pointer 0
push this 0
push this 1
push this 0
push this 2
add
push this 1
push this 3
add
call Screen.drawRectangle 4
pop temp 0
push constant 0
return
function Bat.setDirection 0
push argument 0
pop pointer 0
push argument 1
pop this 4
push constant 0
return
function Bat.getLeft 0
push argument 0
pop pointer 0
push this 0
return
function Bat.getRight 0
push argument 0
pop pointer 0
push this 0
push this 2
add
return
function Bat.setWidth 0
push argument 0
pop pointer 0
push pointer 0
call Bat.hide 1
pop temp 0
push argument 1
pop this 2
push pointer 0
call Bat.show 1
pop temp 0
push constant 0
return
function Bat.move 0
push argument 0
pop pointer 0
push this 4
push constant 1
eq
not
if-goto L0
push this 0
push constant 4
sub
pop this 0
push this 0
push constant 0
lt
not
if-goto L1
push constant 0
pop this 0
goto L2
label L1
label L2
push constant 0
call Screen.setColor 1
pop temp 0
push this 0
push this 2
add
push constant 1
add
push this 1
push this 0
push this 2
add
push constant 4
add
push this 1
push this 3
add
call Screen.drawRectangle 4
pop temp 0
push constant 1
neg
call Screen.setColor 1
pop temp 0
push this 0
push this 1
push this 0
push constant 3
add
push this 1
push this 3
add
call Screen.drawRectangle 4
pop temp 0
goto L3
label L0
push this 0
push constant 4
add
pop this 0
push this 0
push this 2
add
push constant 511
gt
not
if-goto L4
push constant 511
push this 2
sub
pop this 0
goto L5
label L4
label L5
push constant 0
call Screen.setColor 1
pop temp 0
push this 0
push constant 4
sub
push this 1
push this 0
push constant 1
sub
push this 1
push this 3
add
call Screen.drawRectangle 4
pop temp 0
push constant 1
neg
call Screen.setColor 1
pop temp 0
push this 0
push this 2
add
push constant 3
sub
push this 1
push this 0
push this 2
add
push this 1
push this 3
add
call Screen.drawRectangle 4
pop temp 0
label L3
push constant 0
return
projects/11/Pong/Main.jack
Executable
+20
View File
@@ -0,0 +1,20 @@
// 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/Main.jack
/**
* The main class of the Pong game.
*/
class Main {
/** Initializes a Pong game and starts running it. */
function void main() {
var PongGame game;
do PongGame.newInstance();
let game = PongGame.getInstance();
do game.run();
do game.dispose();
return;
}
}
projects/11/Pong/Main.vm
Executable
+13
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@@ -0,0 +1,13 @@
function Main.main 1
call PongGame.newInstance 0
pop temp 0
call PongGame.getInstance 0
pop local 0
push local 0
call PongGame.run 1
pop temp 0
push local 0
call PongGame.dispose 1
pop temp 0
push constant 0
return
projects/11/Pong/PongGame.jack
Executable
+137
View File
@@ -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;
}
}
projects/11/Pong/PongGame.vm
Executable
+321
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@@ -0,0 +1,321 @@
function PongGame.new 0
push constant 7
call Memory.alloc 1
pop pointer 0
call Screen.clearScreen 0
pop temp 0
push constant 50
pop this 6
push constant 230
push constant 229
push this 6
push constant 7
call Bat.new 4
pop this 0
push constant 253
push constant 222
push constant 0
push constant 511
push constant 0
push constant 229
call Ball.new 6
pop this 1
push this 1
push constant 400
push constant 0
call Ball.setDestination 3
pop temp 0
push constant 0
push constant 238
push constant 511
push constant 240
call Screen.drawRectangle 4
pop temp 0
push constant 22
push constant 0
call Output.moveCursor 2
pop temp 0
push constant 8
call String.new 1
push constant 83
call String.appendChar 2
push constant 99
call String.appendChar 2
push constant 111
call String.appendChar 2
push constant 114
call String.appendChar 2
push constant 101
call String.appendChar 2
push constant 58
call String.appendChar 2
push constant 32
call String.appendChar 2
push constant 48
call String.appendChar 2
call Output.printString 1
pop temp 0
push constant 0
pop this 3
push constant 0
pop this 4
push constant 0
pop this 2
push constant 0
pop this 5
push pointer 0
return
function PongGame.dispose 0
push argument 0
pop pointer 0
push this 0
call Bat.dispose 1
pop temp 0
push this 1
call Ball.dispose 1
pop temp 0
push pointer 0
call Memory.deAlloc 1
pop temp 0
push constant 0
return
function PongGame.newInstance 0
call PongGame.new 0
pop static 0
push constant 0
return
function PongGame.getInstance 0
push static 0
return
function PongGame.run 1
push argument 0
pop pointer 0
label L0
push this 3
not
not
if-goto L1
label L2
push local 0
push constant 0
eq
push this 3
not
and
not
if-goto L3
call Keyboard.keyPressed 0
pop local 0
push this 0
call Bat.move 1
pop temp 0
push pointer 0
call PongGame.moveBall 1
pop temp 0
push constant 50
call Sys.wait 1
pop temp 0
goto L2
label L3
push local 0
push constant 130
eq
not
if-goto L4
push this 0
push constant 1
call Bat.setDirection 2
pop temp 0
goto L5
label L4
push local 0
push constant 132
eq
not
if-goto L6
push this 0
push constant 2
call Bat.setDirection 2
pop temp 0
goto L7
label L6
push local 0
push constant 140
eq
not
if-goto L8
push constant 1
neg
pop this 3
goto L9
label L8
label L9
label L7
label L5
label L10
push local 0
push constant 0
eq
not
push this 3
not
and
not
if-goto L11
call Keyboard.keyPressed 0
pop local 0
push this 0
call Bat.move 1
pop temp 0
push pointer 0
call PongGame.moveBall 1
pop temp 0
push constant 50
call Sys.wait 1
pop temp 0
goto L10
label L11
goto L0
label L1
push this 3
not
if-goto L12
push constant 10
push constant 27
call Output.moveCursor 2
pop temp 0
push constant 9
call String.new 1
push constant 71
call String.appendChar 2
push constant 97
call String.appendChar 2
push constant 109
call String.appendChar 2
push constant 101
call String.appendChar 2
push constant 32
call String.appendChar 2
push constant 79
call String.appendChar 2
push constant 118
call String.appendChar 2
push constant 101
call String.appendChar 2
push constant 114
call String.appendChar 2
call Output.printString 1
pop temp 0
goto L13
label L12
label L13
push constant 0
return
function PongGame.moveBall 5
push argument 0
pop pointer 0
push this 1
call Ball.move 1
pop this 2
push this 2
push constant 0
gt
push this 2
push this 5
eq
not
and
not
if-goto L14
push this 2
pop this 5
push constant 0
pop local 0
push this 0
call Bat.getLeft 1
pop local 1
push this 0
call Bat.getRight 1
pop local 2
push this 1
call Ball.getLeft 1
pop local 3
push this 1
call Ball.getRight 1
pop local 4
push this 2
push constant 4
eq
not
if-goto L15
push local 1
push local 4
gt
push local 2
push local 3
lt
or
pop this 3
push this 3
not
not
if-goto L16
push local 4
push local 1
push constant 10
add
lt
not
if-goto L17
push constant 1
neg
pop local 0
goto L18
label L17
push local 3
push local 2
push constant 10
sub
gt
not
if-goto L19
push constant 1
pop local 0
goto L20
label L19
label L20
label L18
push this 6
push constant 2
sub
pop this 6
push this 0
push this 6
call Bat.setWidth 2
pop temp 0
push this 4
push constant 1
add
pop this 4
push constant 22
push constant 7
call Output.moveCursor 2
pop temp 0
push this 4
call Output.printInt 1
pop temp 0
goto L21
label L16
label L21
goto L22
label L15
label L22
push this 1
push local 0
call Ball.bounce 2
pop temp 0
goto L23
label L14
label L23
push constant 0
return