In this lab, you are required to complete the code of Conway's Game of Life. You will practice your JavaFX knowledge, especially the use of timer.

The Game of Life, also known simply as Life, is a cellular automaton devised by the British mathematician John Horton Conway in 1970.

The "game" is a zero-player game, meaning that its evolution is determined by its initial state, requiring no further input. One interacts with the Game of Life by creating an initial configuration and observing how it evolves, or, for advanced "players", by creating patterns with particular properties.

Every cell interacts with its eight neighbours, which are the cells that are horizontally, vertically, or diagonally adjacent. At each step in time, the following transitions occur:

1. Any live cell with fewer than two live neighbours dies, as if caused by underpopulation (模拟生命数量稀少).
2. Any live cell with two or three live neighbours lives on to the next generation.
3. Any live cell with more than three live neighbours dies, as if by overpopulation (模拟生命数量过多).
4. Any dead cell with exactly three live neighbours becomes a live cell, as if by reproduction (模拟繁殖).

In this lab, you have three options:

1. Start from zero. Complete all of the code by yourself. This is the recommended option, because students in previous years were all required to do so. You only need to display the UI and handle the basic logic correctly.
2. Start from the code TA provides. The application has only one frame. You need to implement the updateCell method and a timer to run the game automatically.
3. Based on the second option, you can select some advanced features to implement. Look at the animation gif on top of this document. There is a textview showing current generation, a button to pause and play, a next button, and a clear button. These all add to the complexity of the code and you are free to challege yourself.

1 . java.util.Timer. Here is a sample:

importjava.awt.Toolkit; importjava.util.Timer; importjava.util.TimerTask; /** * Simple demo that uses java.util.Timer to schedule a task to execute once 5 * seconds have passed, and every 10 seconds. */classGameOfLife{// Toolkit is only used to "beep" in this example.// You don't need to use Toolkit in your code.private static Toolkit toolkit;privatestaticTimertimer; privatestaticToolkittoolkit; publicstaticvoidmain(Stringargs[]){System.out.println("About to schedule task."); intdelaySeconds = 5, periodSeconds = 10; toolkit = Toolkit.getDefaultToolkit(); timer = newTimer(); timer.schedule(newTimerTask(){publicvoidrun(){System.out.println("Time's up!"); toolkit.beep()} }, delaySeconds * 1000, periodSeconds * 1000); System.out.println("Task scheduled.")} }

2 . Timeline. Here is an example:

importjavafx.animation.Animation; importjavafx.animation.KeyFrame; importjavafx.animation.Timeline; importjavafx.application.Application; importjavafx.stage.Stage; importjavafx.util.Duration; publicclassTestextendsApplication{privateintcount = 1; @Overridepublicvoidstart(StageprimaryStage) throwsException{KeyFramekeyFrame = newKeyFrame(Duration.millis(1000), e ->{System.out.println(count++); // Do more things here... }); Timelinetimeline = newTimeline(keyFrame); timeline.setCycleCount(Animation.INDEFINITE); // loop infinitlytimeline.play(); // start timeline } }

The example code uses lambda expression. If you have further questions, refer to your textbook for help!

Deadline: Tuesday, 2016.12.20 23:59:59 (UTC+8)

Upload your work to:

ftp://10.132.141.33/classes/16/161 程序设计A （戴开宇）/WORK_UPLOAD/lab13