新春将至，使用Java送祝福，给亲友们放个烟花。
效果展示
核心逻辑
加载背景
public void paint(Graphics g) { ImageIcon image = new ImageIcon("src\\main\\resources\\image\\1.jpg"); getGraphics().drawImage(image.getImage(), 0, 0, getSize().width, getSize().height, this); super.paint(g); }
编写线程的run函数，使得烟花升起，爆炸，消失
public void run() { //已移动量,会递减，直到大于鼠标点击的y坐标 int hasMoved = panelHeight; //需要一个线程级变量来存储单个线程的坐标 int threadyClick = yClick; int threadxClick = xClick; //新建一个Graphics变量 Graphics graphics = getGraphics(); int v; v = 3; //rgb颜色变量 int r, g, b; //烟花上升过程 while (threadyClick < hasMoved) { hasMoved -= upSpeed; graphics.setColor(new Color(247, 247, 248)); graphics.fillOval(threadxClick, hasMoved, upWidth, upHeight); for (int j = 0; j <= 10; j++) { graphics.setColor(new Color(247, 247, 248)); graphics.fillOval(threadxClick, hasMoved + j * upSpeed, upWidth, upHeight); } graphics.setColor(Color.black); graphics.fillOval(threadxClick, hasMoved + upSpeed * 10, upWidth, upHeight); try { Thread.currentThread().sleep(v++); } catch (InterruptedException e) { } } //置黑色 for (int j = 10; j >= 0; j--) { graphics.setColor(Color.black); graphics.fillOval(threadxClick, hasMoved + (j * upSpeed), upWidth, upHeight); try { Thread.currentThread().sleep((v++) / 3); } catch (InterruptedException e) { } } hasMoved = panelHeight; while (hasMoved > threadyClick) { graphics.setColor(Color.black); graphics.fillOval(threadxClick - 2, hasMoved, upWidth, upHeight); hasMoved -= upSpeed; } int atX = threadxClick; int atY = threadyClick; //初始化x、y方向初速度 int x0 = 0; int y0 = 0; int[][] xPoints = new int[boomNum][400]; int[][] yPoints = new int[boomNum][400]; int[] usedSize = new int[boomNum]; for (int j = 0; j < boomNum; j++) { x0 = (int) (Math.random() * (sumV * 2 + 1)) - sumV; // y0 = (int) (Math.random() * verV) - verV / 2; int yinit = (int) Math.sqrt(sumV * sumV - x0 * x0); y0 = yinit >= 0 ? yinit : -yinit; y0 = (int) (Math.random() * y0); for (int i = 0; i < 400; i++) { int y = (int) (y0 * i * freq - 0.5 * G * i * i * freq * freq - 0.5 * GM * i * i * freq * freq); int x = (int) (x0 * i * freq - 0.5 * GM * i * i * freq * freq); // x = Math.abs(x) > Math.abs(atX - xPoints[j][i - 1]) ? x : atX - xPoints[j][i - 1]; if (x * x + y * y <= d * d) { xPoints[j][i] = atX - x; yPoints[j][i] = atY - y; usedSize[j]++; } else { break; } } } v = 20; r = (int) (Math.random() * (255 - 200 + 1) + 200); g = (int) (Math.random() * (255 - 150 + 1) + 150); b = (int) (Math.random() * (255 - 10 + 1) + 10); for (int j = 0; j <= 30; j++) { for (int i = 0; i < boomNum; i++) { //剔除空值 int pointSize = 0; int[] thisPointsx = new int[400]; int[] thisPointsy = new int[400]; for (int size = 0; size < xPoints[i].length; size++) { if (xPoints[i][size] != 0 && yPoints[i][size] != 0) { thisPointsx[pointSize] = xPoints[i][size]; thisPointsy[pointSize] = yPoints[i][size]; pointSize++; } } if (j < boomLength) { graphics.setColor(new Color(247, 247, 248)); graphics.fillOval(thisPointsx[j], thisPointsy[j], boomWidth + 10, boomHeight); } else { graphics.setColor(new Color(r, g, b)); graphics.fillOval(thisPointsx[j], thisPointsy[j], boomWidth, boomHeight); } // graphics.drawPolyline(thisPointsx, thisPointsy, usedSize[i]); if (j >= boomLength) { graphics.setColor(Color.black); // graphics.drawPolyline(thisPointsx, thisPointsy, j - boomLength); graphics.fillOval(thisPointsx[j - boomLength], thisPointsy[j - boomLength], boomWidth + 10, boomHeight); } } v++; v = Math.min(v, 150); try { Thread.currentThread().sleep(v); } catch (InterruptedException e) { } } for (int i = 0; i < boomNum; i++) { for (int j = 0; j < 100; j++) { graphics.setColor(Color.black); // graphics.drawPolyline(xPoints[i], yPoints[i], 100); graphics.fillOval(xPoints[i][j], yPoints[i][j], boomWidth, boomHeight); } } }
触发函数，点击屏幕会创建烟花线程
public void mousePressed(MouseEvent e) { xClick = e.getX(); yClick = e.getY(); Thread thread = new Thread(this); thread.start(); }
主函数中创建frame类，将烟花类添加进页面中
public static void main(String args[]) throws InterruptedException { FireFlower fireFlower = new FireFlower(); JFrame frame = new JFrame("新年快乐"); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); frame.getContentPane().add(fireFlower, BorderLayout.CENTER); frame.setSize(panelLength, panelHeight); //背景色黑色 fireFlower.setBackground(Color.black); fireFlower.init(); fireFlower.start(); frame.setVisible(true); Random rand = new Random(); for(int i=0;i<1000;i++){ int sec = rand.nextInt(1000); fireFlower.xClick = rand.nextInt(1600); fireFlower.yClick = rand.nextInt(800); Thread thread = new Thread(fireFlower); thread.sleep(sec); thread.start(); } }
完整代码
import java.awt.*; import java.applet.*; import java.awt.event.*; import java.util.Random; import javax.swing.*; public class FireFlower extends Applet implements MouseListener, Runnable { int xClick = 0, yClick = 0; static int panelLength = 1600; static int panelHeight = 800; //烟花上升速度 static int upSpeed = 5; //爆炸条数 static int boomNum = 100; //重力加速度 static double G = 9.8; //摩擦力加速度 static double GM = 5; //半径 static int d = 1500; //频率 static double freq = 0.08; //烟花炸开时保留长度 static int boomLength = 7; //上升图形宽度 static int upWidth = 5; //上升高度 static int upHeight = 5; //爆炸点宽度 static int boomWidth = 3; //爆炸点高度 static int boomHeight = 3; //水平速度 static int horV = 50; //竖直速度 static int verV = 40; //总速度 static int sumV = 60; FireFlower() { addMouseListener(this); } @Override public void paint(Graphics g) { ImageIcon image = new ImageIcon("src\\main\\resources\\image\\1.jpg"); getGraphics().drawImage(image.getImage(), 0, 0, getSize().width, getSize().height, this); super.paint(g); } @Override public void paintComponents(Graphics g) { super.paintComponents(g); } /** * 使该程序能够作为应用程序执行。 */ public static void main(String args[]) throws InterruptedException { FireFlower fireFlower = new FireFlower(); JFrame frame = new JFrame("新年快乐"); frame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent e) { System.exit(0); } }); frame.getContentPane().add(fireFlower, BorderLayout.CENTER); frame.setSize(panelLength, panelHeight); //背景色黑色 fireFlower.setBackground(Color.black); fireFlower.init(); fireFlower.start(); frame.setVisible(true); Random rand = new Random(); for(int i=0;i<1000;i++){ int sec = rand.nextInt(1000); fireFlower.xClick = rand.nextInt(1600); fireFlower.yClick = rand.nextInt(800); Thread thread = new Thread(fireFlower); thread.sleep(sec); thread.start(); } } /** * 点击会产生一个线程来执行烟花升空 */ public void run() { //已移动量,会递减，直到大于鼠标点击的y坐标 int hasMoved = panelHeight; //需要一个线程级变量来存储单个线程的坐标 int threadyClick = yClick; int threadxClick = xClick; //新建一个Graphics变量 Graphics graphics = getGraphics(); int v; v = 3; //rgb颜色变量 int r, g, b; //烟花上升过程 while (threadyClick < hasMoved) { hasMoved -= upSpeed; graphics.setColor(new Color(247, 247, 248)); graphics.fillOval(threadxClick, hasMoved, upWidth, upHeight); for (int j = 0; j <= 10; j++) { graphics.setColor(new Color(247, 247, 248)); graphics.fillOval(threadxClick, hasMoved + j * upSpeed, upWidth, upHeight); } graphics.setColor(Color.black); graphics.fillOval(threadxClick, hasMoved + upSpeed * 10, upWidth, upHeight); try { Thread.currentThread().sleep(v++); } catch (InterruptedException e) { } } //置黑色 for (int j = 10; j >= 0; j--) { graphics.setColor(Color.black); graphics.fillOval(threadxClick, hasMoved + (j * upSpeed), upWidth, upHeight); try { Thread.currentThread().sleep((v++) / 3); } catch (InterruptedException e) { } } hasMoved = panelHeight; while (hasMoved > threadyClick) { graphics.setColor(Color.black); graphics.fillOval(threadxClick - 2, hasMoved, upWidth, upHeight); hasMoved -= upSpeed; } int atX = threadxClick; int atY = threadyClick; //初始化x、y方向初速度 int x0 = 0; int y0 = 0; int[][] xPoints = new int[boomNum][400]; int[][] yPoints = new int[boomNum][400]; int[] usedSize = new int[boomNum]; for (int j = 0; j < boomNum; j++) { x0 = (int) (Math.random() * (sumV * 2 + 1)) - sumV; // y0 = (int) (Math.random() * verV) - verV / 2; int yinit = (int) Math.sqrt(sumV * sumV - x0 * x0); y0 = yinit >= 0 ? yinit : -yinit; y0 = (int) (Math.random() * y0); for (int i = 0; i < 400; i++) { int y = (int) (y0 * i * freq - 0.5 * G * i * i * freq * freq - 0.5 * GM * i * i * freq * freq); int x = (int) (x0 * i * freq - 0.5 * GM * i * i * freq * freq); // x = Math.abs(x) > Math.abs(atX - xPoints[j][i - 1]) ? x : atX - xPoints[j][i - 1]; if (x * x + y * y <= d * d) { xPoints[j][i] = atX - x; yPoints[j][i] = atY - y; usedSize[j]++; } else { break; } } } v = 20; r = (int) (Math.random() * (255 - 200 + 1) + 200); g = (int) (Math.random() * (255 - 150 + 1) + 150); b = (int) (Math.random() * (255 - 10 + 1) + 10); for (int j = 0; j <= 30; j++) { for (int i = 0; i < boomNum; i++) { //剔除空值 int pointSize = 0; int[] thisPointsx = new int[400]; int[] thisPointsy = new int[400]; for (int size = 0; size < xPoints[i].length; size++) { if (xPoints[i][size] != 0 && yPoints[i][size] != 0) { thisPointsx[pointSize] = xPoints[i][size]; thisPointsy[pointSize] = yPoints[i][size]; pointSize++; } } if (j < boomLength) { graphics.setColor(new Color(247, 247, 248)); graphics.fillOval(thisPointsx[j], thisPointsy[j], boomWidth + 10, boomHeight); } else { graphics.setColor(new Color(r, g, b)); graphics.fillOval(thisPointsx[j], thisPointsy[j], boomWidth, boomHeight); } // graphics.drawPolyline(thisPointsx, thisPointsy, usedSize[i]); if (j >= boomLength) { graphics.setColor(Color.black); // graphics.drawPolyline(thisPointsx, thisPointsy, j - boomLength); graphics.fillOval(thisPointsx[j - boomLength], thisPointsy[j - boomLength], boomWidth + 10, boomHeight); } } v++; v = Math.min(v, 150); try { Thread.currentThread().sleep(v); } catch (InterruptedException e) { } } for (int i = 0; i < boomNum; i++) { for (int j = 0; j < 100; j++) { graphics.setColor(Color.black); // graphics.drawPolyline(xPoints[i], yPoints[i], 100); graphics.fillOval(xPoints[i][j], yPoints[i][j], boomWidth, boomHeight); } } } public void mouseClicked(MouseEvent e) { } /** * 监听鼠标按键 * * @param e */ public void mousePressed(MouseEvent e) { xClick = e.getX(); yClick = e.getY(); Thread thread = new Thread(this); thread.start(); } public void mouseReleased(MouseEvent e) { } public void mouseEntered(MouseEvent e) { } public void mouseExited(MouseEvent e) { } }
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