一个多彩泡泡屏保特效(JS+CSS版) https://my.oschina.net/darkness/blog/360394

package screensaver;
import java.awt.AlphaComposite;
import java.awt.Composite;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.util.ArrayList;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;import com.abigdreamer.infinity.common.util.IntegerValue;
import com.sun.awt.AWTUtilities;@SuppressWarnings("restriction")
public class BubblesScreensaver {// 常量static int D = 222; // 泡泡直径static double K = 0.999;static double POW_RATE = 0.0001; // 补偿概率static double POW_RANGE = 0.8; // 补偿范围(基于诞生速度)public static double SPEED_X() {return 8 + (RND() * 4);}public static double SPEED_Y() {return 6 + (RND() * 2);}static List<Bubble> arrBubs = new ArrayList<>();static double iBottom;static double iRight;public static double SQRT(double a) {return Math.sqrt(a);}public static double RND() {return Math.random();}static int clientWidth;static int clientHeight;public static void main(String[] args) {JFrame frame = new JFrame();frame.setAlwaysOnTop(true);frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);frame.setUndecorated(true);frame.setExtendedState(JFrame.MAXIMIZED_BOTH);AWTUtilities.setWindowOpaque(frame, false);final JPanel pane = new JPanel() {private static final long serialVersionUID = 1L;@Overridepublic void paint(Graphics g) {super.paint(g);Graphics2D g2d = (Graphics2D) g;int n = arrBubs.size();for (int j = 0; j < n; j++) {Bubble bub = arrBubs.get(j);float v;g2d.translate(bub.x, bub.y);g2d.drawImage(bub.images[3], 0, 0, null);Composite old = g2d.getComposite();for (int i = 0; i < 3; i++) {v = (float) Math.abs(Math.sin(bub.kOpa[i] += bub.kStp[i] * Math.random()));v *= bub.POW[i];// v = ((v * 1e4) >> 0) / 1e4;AlphaComposite alphaComposite = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, v);g2d.setComposite(alphaComposite);// 透明度g2d.drawImage(bub.images[i], 0, 0, null);// 背景}g2d.setComposite(old);g2d.translate(-bub.x, -bub.y);}}};pane.setOpaque(false);frame.setContentPane(pane);frame.setVisible(true);clientHeight = frame.getHeight();clientWidth = frame.getWidth();int MAX = 5;IntegerValue integerValue = new IntegerValue();Timer timer1 = new Timer();timer1.schedule(new TimerTask() {public void run() {if (integerValue.get() < MAX) {integerValue.add();CreateBubble(frame);} else {timer1.cancel();}}}, 10, 1000);// delay=2000毫秒 后执行该任务Timer timer = new Timer();timer.schedule(new TimerTask() {public void run() {update();pane.repaint();}}, 10, 17);// delay=2000毫秒 后执行该任务}public static void CreateBubble(JFrame frame) {Bubble bub = new Bubble();bub.setX(0);bub.setY(0);bub.vx = SPEED_X();bub.vy = SPEED_Y();arrBubs.add(bub);};public static void update() {int n = arrBubs.size();int i, j;updateWall();for (i = 0; i < n; i++) {Bubble bub = arrBubs.get(i);bub.vx *= K;bub.vy *= K;if (RND() < POW_RATE) {bub.vx = SPEED_X() * (1 + RND() * POW_RANGE);bub.vy = SPEED_Y() * (1 + RND() * POW_RANGE);}bub.setX(bub.x + bub.vx);bub.setY(bub.y + bub.vy);checkWalls(bub);}Bubble bub, bub2;for (i = 0; i < n - 1; i++) {bub = arrBubs.get(i);for (j = i + 1; j < n; j++) {bub2 = arrBubs.get(j);checkCollision(bub, bub2);}}}public static void updateWall() {iRight = clientWidth - D;iBottom = clientHeight - D;}public static void checkWalls(Bubble bub) {if (bub.x < 0) {bub.setX(0);bub.vx *= -1;} else if (bub.x > iRight) {bub.setX(iRight);bub.vx *= -1;}if (bub.y < 0) {bub.setY(0);bub.vy *= -1;} else if (bub.y > iBottom) {bub.setY(iBottom);bub.vy *= -1;}}static class Position {public double x;public double y;public Position(double x, double y) {this.x = x;this.y = y;}}public static Position rotate(double x, double y, double sin, double cos, boolean reverse) {if (reverse)return new Position((x * cos + y * sin), (y * cos - x * sin));elsereturn new Position((x * cos - y * sin), (y * cos + x * sin));}public static void checkCollision(Bubble bub0, Bubble bub1) {double dx = bub1.x - bub0.x;double dy = bub1.y - bub0.y;double dist = SQRT(dx * dx + dy * dy);if (dist < D) {// 计算角度和正余弦值double angle = Math.atan2(dy, dx);double sin = Math.sin(angle);double cos = Math.cos(angle);// 旋转 bub0 的位置Position pos0 = new Position(0, 0);// 旋转 bub1 的速度Position pos1 = rotate(dx, dy, sin, cos, true);// 旋转 bub0 的速度Position vel0 = rotate(bub0.vx, bub0.vy, sin, cos, true);// 旋转 bub1 的速度Position vel1 = rotate(bub1.vx, bub1.vy, sin, cos, true);// 碰撞的作用力double vxTotal = vel0.x - vel1.x;vel0.x = vel1.x;vel1.x = vxTotal + vel0.x;// 更新位置double absV = Math.abs(vel0.x) + Math.abs(vel1.x);double overlap = D - Math.abs(pos0.x - pos1.x);pos0.x += vel0.x / absV * overlap;pos1.x += vel1.x / absV * overlap;// 将位置旋转回来Position pos0F = rotate(pos0.x, pos0.y, sin, cos, false);Position pos1F = rotate(pos1.x, pos1.y, sin, cos, false);// 将位置调整为屏幕的实际位置bub1.setX(bub0.x + pos1F.x);bub1.setY(bub0.y + pos1F.y);bub0.setX(bub0.x + pos0F.x);bub0.setY(bub0.y + pos0F.y);// 将速度旋转回来Position vel0F = rotate(vel0.x, vel0.y, sin, cos, false);Position vel1F = rotate(vel1.x, vel1.y, sin, cos, false);bub0.vx = vel0F.x;bub0.vy = vel0F.y;bub1.vx = vel1F.x;bub1.vy = vel1F.y;}}}class Bubble {static int D = 222; // 泡泡直径double APLHA = 0.8;double[] POW = new double[] { 1.0, APLHA, APLHA * APLHA };double vx;double vy;double x;double y;double[] kOpa;double[] kStp;Image[] images = new Image[4];public Bubble() {double[] kOpa = new double[4];double[] kStp = new double[4];for (int i = 0; i < 4; i++) {// 泡泡顶层if (i == 3) {ImageIcon imageIcon = new ImageIcon(getClass().getResource("heart.png"));images[i] = imageIcon.getImage();} else {ImageIcon imageIcon = new ImageIcon(getClass().getResource("ch" + i + ".png"));images[i] = imageIcon.getImage();}kOpa[i] = 3 * Math.random();kStp[i] = 0.02 * Math.random();}this.kOpa = kOpa;this.kStp = kStp;}public void setX(double x) {this.x = x;}public void setY(double y) {this.y = y;}}