谁能提供一些关于如何正确创建动画的帮助建议？

Question

我正在用java创建生命游戏，但我在动画部分遇到了问题。我在一个JComponent上绘制了单元格，它的显示是应该的，但我有一个启动按钮，应该启动整个动画过程，但当我点击启动按钮时，什么也没有发生。

从我所看的教程和我所做的研究中，我知道你一定有一个叫做 "JComponent "的程序。ActionListener 的按钮和一个 actionPerformed() 我的代码如下。

import javax.swing.JFrame;
import java.util.Random;
import java.util.Arrays;
import javax.swing.JComponent;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Color;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.*;
import javax.swing.*;
import java.awt.BorderLayout;

public class GameOfLife extends JFrame {

  int PIXELSIZE = 10;
  int ROW = 75;
  int COLUMN = 75;
  Random random = new Random();
  JButton start;

  public GameOfLife() {
    JPanel panel = new JPanel();
    DrawCells cellsComp = new DrawCells();
    DrawCells buttonListener = new DrawCells();
    start = new JButton("Start");
    start.addActionListener(cellsComp);
    panel.setLayout(new BorderLayout());
    start.setToolTipText("Click to start game of life");
    this.setTitle("Game Of Life: Java");
    this.setSize(PIXELSIZE * ROW, PIXELSIZE * COLUMN);
    this.setLocationRelativeTo(null);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    panel.add(start, BorderLayout.SOUTH);
    panel.add(cellsComp, BorderLayout.CENTER);
    this.add(panel);
    this.setVisible(true);
  }

  private class DrawCells extends JComponent implements ActionListener {
    int x;
    int y;
    int grid[][] = new int[ROW][COLUMN];
    int updatedGrid[][] = new int[ROW][COLUMN];

    public void createGrid() {
      for (int i = 0; i < grid.length; i++) {
        for (int j = 0; j < grid[i].length; j++) {
          grid[i][j] = random.nextInt(2);
        }
      }
    }

    public void applyRules() {
      for (int i = 1; i < ROW - 1; i++) {
        for (int j = 1; j < COLUMN - 1; j++) {
          int neighboursCount = 0; // used to count the neighbours of each cell

          neighboursCount += grid[i-1][j-1]; // top left
          neighboursCount += grid[i][j-1]; // top center
          neighboursCount += grid[i+1][j-1]; // top right

          neighboursCount += grid[i-1][j]; // middle left
          neighboursCount += grid[i+1][j]; // middle right

          neighboursCount += grid[i-1][j+1]; // top left
          neighboursCount += grid[i][j+1]; // top center
          neighboursCount += grid[i+1][j+1]; // top right

          // Game of Life rules:

          // Alive cells:
          if (grid[i][j] == 1) {
            // rule 1 any live cell with fewer than two live neighboours dies, as if by underpopulation
            if (neighboursCount < 2) {
              updatedGrid[i][j] = 0;
            }
            // rule 2 any live cell with two or three live neighbours, lives on to the generation
            else if (neighboursCount == 2 || neighboursCount == 3) {
              updatedGrid[i][j] = 1;
            }
            // rule 3 any live cell with more than three live neighbours dies, as if by overpopulation
            else if (neighboursCount > 3 && neighboursCount <= 8) {
              updatedGrid[i][j] = 0;
            }
            else {
              updatedGrid[i][j] = 0;
            }
          }
          // Dead cells
          else if (grid[i][j] == 0) {
            // rule 4 any dead cell with exactly three live neighbours becomes a live cell, as if by reproduction
            if (neighboursCount == 3) {
              updatedGrid[i][j] = 1;
            }
            else {
              updatedGrid[i][j] = 0;
            }
          }
        }
      }
      for (int i = 0; i < ROW; i++) {
        for (int j = 0; j < COLUMN; j++) {
          grid[i][j] = updatedGrid[i][j];
        }
      }
    }

    public void paintComponent(Graphics g) {
      super.paintComponent(g);
      createGrid();
      Graphics2D g2 = (Graphics2D) g;
      for (int i = 0; i < ROW; i++) {
        for (int j = 0; j < COLUMN; j++) {
          if (grid[i][j] == 1) {
            g2.setColor(Color.RED);
            g2.fillRect(i * PIXELSIZE, j * PIXELSIZE, PIXELSIZE, PIXELSIZE);
          }
        }
      }
    }

    public void actionPerformed(ActionEvent e) {
      if (e.getSource() == start) {
        applyRules();
        repaint();
        thread.sleep();
      }
    }
  }

  public static void main(String[] args) {
    GameOfLife gol = new GameOfLife();
  }
}

其实我想问的是一个清晰的解释 如何让一些代码产生动画效果 或者是一个好的方向指引 我缺少什么需要添加什么才能让我的代码产生动画效果？

先谢谢你的帮助：D

Answer 1

我假设你的gui工作正常。在你执行的动作中，你需要启动动画。在swing中做动画的一个常见方法是使用一个 定时器.

Timer animation;
public void actionPerformed(ActionEvent e) {
  if (e.getSource() == start && animation == null) {
      createGrid();  //remove this from paint component.
      int delay = 1000; //milliseconds
      ActionListener taskPerformer = new ActionListener() {
          public void actionPerformed(ActionEvent evt) {
              applyRules();
              repaint();
          }
      };
      animation = new Timer(delay, taskPerformer);
      animation.start();
  }
}

我使用的是匿名类 taskPerformer 因为那是来自于所提供的javadoc链接中的例子。