From 9542deeb483a00b6fabed7574720926ce97d7511 Mon Sep 17 00:00:00 2001 From: Frederick Yin Date: Tue, 16 Aug 2022 11:54:23 +0800 Subject: Projects, 01-06 completed --- projects/11/Average/Main.jack | 29 ++++++ projects/11/ComplexArrays/Main.jack | 70 +++++++++++++ projects/11/ConvertToBin/Main.jack | 82 +++++++++++++++ projects/11/Pong/Ball.jack | 203 ++++++++++++++++++++++++++++++++++++ projects/11/Pong/Bat.jack | 103 ++++++++++++++++++ projects/11/Pong/Main.jack | 20 ++++ projects/11/Pong/PongGame.jack | 137 ++++++++++++++++++++++++ projects/11/Seven/Main.jack | 17 +++ projects/11/Square/Main.jack | 17 +++ projects/11/Square/Square.jack | 110 +++++++++++++++++++ projects/11/Square/SquareGame.jack | 81 ++++++++++++++ 11 files changed, 869 insertions(+) create mode 100644 projects/11/Average/Main.jack create mode 100644 projects/11/ComplexArrays/Main.jack create mode 100644 projects/11/ConvertToBin/Main.jack create mode 100644 projects/11/Pong/Ball.jack create mode 100644 projects/11/Pong/Bat.jack create mode 100644 projects/11/Pong/Main.jack create mode 100644 projects/11/Pong/PongGame.jack create mode 100644 projects/11/Seven/Main.jack create mode 100644 projects/11/Square/Main.jack create mode 100644 projects/11/Square/Square.jack create mode 100644 projects/11/Square/SquareGame.jack (limited to 'projects/11') diff --git a/projects/11/Average/Main.jack b/projects/11/Average/Main.jack new file mode 100644 index 0000000..d560bf1 --- /dev/null +++ b/projects/11/Average/Main.jack @@ -0,0 +1,29 @@ +// 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/Average/Main.jack + +// (Same as projects/09/Average/Main.jack) + +// Inputs some numbers and computes their average +class Main { + function void main() { + var Array a; + var int length; + var int i, sum; + + let length = Keyboard.readInt("How many numbers? "); + let a = Array.new(length); // constructs the array + + let i = 0; + while (i < length) { + let a[i] = Keyboard.readInt("Enter a number: "); + let sum = sum + a[i]; + let i = i + 1; + } + + do Output.printString("The average is "); + do Output.printInt(sum / length); + return; + } +} diff --git a/projects/11/ComplexArrays/Main.jack b/projects/11/ComplexArrays/Main.jack new file mode 100644 index 0000000..fe51c20 --- /dev/null +++ b/projects/11/ComplexArrays/Main.jack @@ -0,0 +1,70 @@ +// 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/ComplexArrays/Main.jack + +/** + * Performs several complex array processing tests. + * For each test, the expected result is printed, along with the + * actual result. In each test, the two results should be equal. + */ +class Main { + + function void main() { + var Array a, b, c; + + let a = Array.new(10); + let b = Array.new(5); + let c = Array.new(1); + + let a[3] = 2; + let a[4] = 8; + let a[5] = 4; + let b[a[3]] = a[3] + 3; // b[2] = 5 + let a[b[a[3]]] = a[a[5]] * b[((7 - a[3]) - Main.double(2)) + 1]; // a[5] = 8 * 5 = 40 + let c[0] = null; + let c = c[0]; + + do Output.printString("Test 1: expected result: 5; actual result: "); + do Output.printInt(b[2]); + do Output.println(); + do Output.printString("Test 2: expected result: 40; actual result: "); + do Output.printInt(a[5]); + do Output.println(); + do Output.printString("Test 3: expected result: 0; actual result: "); + do Output.printInt(c); + do Output.println(); + + let c = null; + + if (c = null) { + do Main.fill(a, 10); + let c = a[3]; + let c[1] = 33; + let c = a[7]; + let c[1] = 77; + let b = a[3]; + let b[1] = b[1] + c[1]; // b[1] = 33 + 77 = 110; + } + + do Output.printString("Test 4: expected result: 77; actual result: "); + do Output.printInt(c[1]); + do Output.println(); + do Output.printString("Test 5: expected result: 110; actual result: "); + do Output.printInt(b[1]); + do Output.println(); + return; + } + + function int double(int a) { + return a * 2; + } + + function void fill(Array a, int size) { + while (size > 0) { + let size = size - 1; + let a[size] = Array.new(3); + } + return; + } +} diff --git a/projects/11/ConvertToBin/Main.jack b/projects/11/ConvertToBin/Main.jack new file mode 100644 index 0000000..e627486 --- /dev/null +++ b/projects/11/ConvertToBin/Main.jack @@ -0,0 +1,82 @@ +// 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/ConvertToBin/Main.jack + +/** + * Unpacks a 16-bit number into its binary representation: + * Takes the 16-bit number stored in RAM[8000] and stores its individual + * bits in RAM[8001..8016] (each location will contain 0 or 1). + * Before the conversion, RAM[8001]..RAM[8016] are initialized to -1. + * + * The program should be tested as follows: + * 1) Load the program into the supplied VM emulator + * 2) Put some value in RAM[8000] + * 3) Switch to "no animation" + * 4) Run the program (give it enough time to run) + * 5) Stop the program + * 6) Check that RAM[8001]..RAM[8016] contains the correct binary result, and + * that none of these memory locations contains -1. + */ +class Main { + + /** + * Initializes RAM[8001]..RAM[8016] to -1, + * and converts the value in RAM[8000] to binary. + */ + function void main() { + var int value; + do Main.fillMemory(8001, 16, -1); // sets RAM[8001]..RAM[8016] to -1 + let value = Memory.peek(8000); // reads a value from RAM[8000] + do Main.convert(value); // performs the conversion + return; + } + + /** Converts the given decimal value to binary, and puts + * the resulting bits in RAM[8001]..RAM[8016]. */ + function void convert(int value) { + var int mask, position; + var boolean loop; + + let loop = true; + while (loop) { + let position = position + 1; + let mask = Main.nextMask(mask); + + if (~(position > 16)) { + + if (~((value & mask) = 0)) { + do Memory.poke(8000 + position, 1); + } + else { + do Memory.poke(8000 + position, 0); + } + } + else { + let loop = false; + } + } + return; + } + + /** Returns the next mask (the mask that should follow the given mask). */ + function int nextMask(int mask) { + if (mask = 0) { + return 1; + } + else { + return mask * 2; + } + } + + /** Fills 'length' consecutive memory locations with 'value', + * starting at 'startAddress'. */ + function void fillMemory(int startAddress, int length, int value) { + while (length > 0) { + do Memory.poke(startAddress, value); + let length = length - 1; + let startAddress = startAddress + 1; + } + return; + } +} diff --git a/projects/11/Pong/Ball.jack b/projects/11/Pong/Ball.jack new file mode 100644 index 0000000..02e47f9 --- /dev/null +++ b/projects/11/Pong/Ball.jack @@ -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; + } +} diff --git a/projects/11/Pong/Bat.jack b/projects/11/Pong/Bat.jack new file mode 100644 index 0000000..340760f --- /dev/null +++ b/projects/11/Pong/Bat.jack @@ -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; + } +} diff --git a/projects/11/Pong/Main.jack b/projects/11/Pong/Main.jack new file mode 100644 index 0000000..45e2dd2 --- /dev/null +++ b/projects/11/Pong/Main.jack @@ -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; + } +} 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; + } +} \ No newline at end of file diff --git a/projects/11/Seven/Main.jack b/projects/11/Seven/Main.jack new file mode 100644 index 0000000..067402e --- /dev/null +++ b/projects/11/Seven/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/Seven/Main.jack + +/** + * Computes the value of 1 + (2 * 3) and prints the result + * at the top-left of the screen. + */ +class Main { + + function void main() { + do Output.printInt(1 + (2 * 3)); + return; + } + +} diff --git a/projects/11/Square/Main.jack b/projects/11/Square/Main.jack new file mode 100644 index 0000000..0753893 --- /dev/null +++ b/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; + } +} diff --git a/projects/11/Square/Square.jack b/projects/11/Square/Square.jack new file mode 100644 index 0000000..5a92838 --- /dev/null +++ b/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; + } +} diff --git a/projects/11/Square/SquareGame.jack b/projects/11/Square/SquareGame.jack new file mode 100644 index 0000000..4fe7e39 --- /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; + } +} + + + -- cgit v1.2.3