416 lines
14 KiB
JavaScript
416 lines
14 KiB
JavaScript
/**
|
||
* 文件功能：聊天室烟花特效（真实感版本）
|
||
*
|
||
* 完整模拟真实烟花流程：
|
||
* 1. 火箭从底部带着尾迹飞向目标高度
|
||
* 2. 到达位置后爆炸，产生 3 种形态：球形/柳叶/星形
|
||
* 3. 每颗粒子带历史轨迹尾巴，随重力下坠并消散
|
||
*
|
||
* 全程透明 Canvas，不遮挡聊天背景。
|
||
*/
|
||
|
||
const FireworksEffect = (() => {
|
||
// ─── 火箭类 ──────────────────────────────────────────
|
||
class Rocket {
|
||
/**
|
||
* @param {number} x 发射 x 位置
|
||
* @param {number} targetY 爆炸目标高度（距顶部比例）
|
||
* @param {string} color 爆炸颜色
|
||
* @param {string} type 爆炸类型：sphere / willow / ring
|
||
*/
|
||
constructor(x, targetY, color, type, canvasHeight) {
|
||
this.x = x;
|
||
this.y = canvasHeight; // 从画布底部出发
|
||
this.targetY = targetY;
|
||
this.color = color;
|
||
this.type = type;
|
||
|
||
// 根据飞行距离动态计算初始速度，保证必然到达目标高度
|
||
// 等比级数求和：total = vy / (1 - 0.98) = vy × 50
|
||
// 加 10%~20% 余量，使火箭略微超过目标再触发爆炸（更真实）
|
||
const dist = canvasHeight - targetY;
|
||
this.vy = -(dist / 50) * (1.1 + Math.random() * 0.15);
|
||
|
||
this.trail = []; // 尾迹历史坐标
|
||
this.exploded = false;
|
||
this.done = false;
|
||
}
|
||
|
||
/** 更新火箭位置，到达目标高度后标记为已爆炸 */
|
||
update() {
|
||
this.trail.push({ x: this.x, y: this.y });
|
||
if (this.trail.length > 10) this.trail.shift();
|
||
this.y += this.vy;
|
||
this.vy *= 0.98; // 轻微减速（仿真阻力）
|
||
if (this.y <= this.targetY) {
|
||
this.exploded = true;
|
||
this.done = true;
|
||
}
|
||
}
|
||
|
||
/** 绘制火箭（白色头部 + 橙色尾迹） */
|
||
draw(ctx) {
|
||
// 尾迹（由新到旧逐渐变淡）
|
||
for (let i = 0; i < this.trail.length; i++) {
|
||
const a = (i / this.trail.length) * 0.6;
|
||
ctx.save();
|
||
ctx.globalAlpha = a;
|
||
ctx.fillStyle = "#ffaa44";
|
||
ctx.shadowColor = "#ff6600";
|
||
ctx.shadowBlur = 6;
|
||
ctx.beginPath();
|
||
ctx.arc(this.trail[i].x, this.trail[i].y, 2, 0, Math.PI * 2);
|
||
ctx.fill();
|
||
ctx.restore();
|
||
}
|
||
// 火箭头部（亮白色光点）
|
||
ctx.save();
|
||
ctx.fillStyle = "#ffffff";
|
||
ctx.shadowColor = "#ffcc88";
|
||
ctx.shadowBlur = 10;
|
||
ctx.beginPath();
|
||
ctx.arc(this.x, this.y, 3, 0, Math.PI * 2);
|
||
ctx.fill();
|
||
ctx.restore();
|
||
}
|
||
}
|
||
|
||
// ─── 爆炸粒子类 ──────────────────────────────────────
|
||
class Particle {
|
||
/**
|
||
* @param {number} x 爆炸中心 x
|
||
* @param {number} y 爆炸中心 y
|
||
* @param {string} color 粒子颜色
|
||
* @param {string} type 爆炸类型
|
||
* @param {number} angle 发射角度（ring 类型用）
|
||
*/
|
||
constructor(x, y, color, type, angle) {
|
||
this.x = x;
|
||
this.y = y;
|
||
this.color = color;
|
||
this.trail = [];
|
||
|
||
let speed;
|
||
if (type === "ring") {
|
||
// 环形：均匀角度，固定速度
|
||
speed = 5 + Math.random() * 2;
|
||
this.vx = Math.cos(angle) * speed;
|
||
this.vy = Math.sin(angle) * speed;
|
||
this.gravity = 0.06;
|
||
this.decay = 0.014;
|
||
this.radius = 2;
|
||
} else if (type === "willow") {
|
||
// 柳叶：慢速，在空中下垂
|
||
speed = Math.random() * 3 + 1;
|
||
const a = Math.random() * Math.PI * 2;
|
||
this.vx = Math.cos(a) * speed;
|
||
this.vy = Math.sin(a) * speed - 2; // 初速稍微向上
|
||
this.gravity = 0.07;
|
||
this.decay = 0.009; // 衰减慢，拖出长尾
|
||
this.radius = 1.5;
|
||
} else {
|
||
// sphere：标准球形爆炸
|
||
speed = Math.random() * 6 + 2;
|
||
const a = Math.random() * Math.PI * 2;
|
||
this.vx = Math.cos(a) * speed;
|
||
this.vy = Math.sin(a) * speed;
|
||
this.gravity = 0.1;
|
||
this.decay = 0.016;
|
||
this.radius = Math.random() * 2 + 1.5;
|
||
}
|
||
|
||
this.alpha = 1;
|
||
// 部分粒子有闪烁效果
|
||
this.sparkle = Math.random() > 0.6;
|
||
this.frame = 0;
|
||
}
|
||
|
||
/** 更新粒子物理状态 */
|
||
update() {
|
||
this.frame++;
|
||
// 保存轨迹历史（尾迹长度由透明度控制）
|
||
this.trail.push({ x: this.x, y: this.y });
|
||
if (this.trail.length > 6) this.trail.shift();
|
||
|
||
this.vy += this.gravity;
|
||
this.x += this.vx;
|
||
this.y += this.vy;
|
||
this.vx *= 0.985;
|
||
this.vy *= 0.985;
|
||
|
||
// 闪烁：每隔几帧透明度轻微抖动
|
||
if (this.sparkle && this.frame % 4 === 0) {
|
||
this.alpha = Math.max(
|
||
0,
|
||
this.alpha - this.decay * (0.5 + Math.random()),
|
||
);
|
||
} else {
|
||
this.alpha -= this.decay;
|
||
}
|
||
}
|
||
|
||
/** 绘制粒子及其运动轨迹尾迹 */
|
||
draw(ctx) {
|
||
// 绘制尾迹
|
||
for (let i = 0; i < this.trail.length; i++) {
|
||
const a = (i / this.trail.length) * this.alpha * 0.45;
|
||
ctx.save();
|
||
ctx.globalAlpha = a;
|
||
ctx.fillStyle = this.color;
|
||
ctx.beginPath();
|
||
ctx.arc(
|
||
this.trail[i].x,
|
||
this.trail[i].y,
|
||
this.radius * 0.55,
|
||
0,
|
||
Math.PI * 2,
|
||
);
|
||
ctx.fill();
|
||
ctx.restore();
|
||
}
|
||
// 绘制粒子主体（带发光）
|
||
ctx.save();
|
||
ctx.globalAlpha = Math.max(0, this.alpha);
|
||
ctx.fillStyle = this.color;
|
||
ctx.shadowColor = this.color;
|
||
ctx.shadowBlur = 8;
|
||
ctx.beginPath();
|
||
ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2);
|
||
ctx.fill();
|
||
ctx.restore();
|
||
}
|
||
|
||
get alive() {
|
||
return this.alpha > 0.01;
|
||
}
|
||
}
|
||
|
||
// ─── 预定义颜色 / 类型 ───────────────────────────────
|
||
const COLORS = [
|
||
"#ff2200",
|
||
"#ff7700",
|
||
"#ffcc00",
|
||
"#00dd44",
|
||
"#cc00ff",
|
||
"#ff0088",
|
||
"#00bbff",
|
||
"#ff4488",
|
||
"#ffaa00",
|
||
];
|
||
const TYPES = ["sphere", "willow", "ring"];
|
||
|
||
/**
|
||
* 生成一批爆炸粒子
|
||
*
|
||
* @param {number} x 爆炸中心 x
|
||
* @param {number} y 爆炸中心 y
|
||
* @param {string} color 颜色
|
||
* @param {string} type 爆炸类型
|
||
* @returns {Particle[]}
|
||
*/
|
||
function _burst(x, y, color, type) {
|
||
const particles = [];
|
||
const count = type === "ring" ? 80 : type === "willow" ? 120 : 100;
|
||
|
||
if (type === "ring") {
|
||
// 环形：均匀分布
|
||
for (let i = 0; i < count; i++) {
|
||
const angle = ((Math.PI * 2) / count) * i;
|
||
particles.push(new Particle(x, y, color, type, angle));
|
||
}
|
||
} else {
|
||
for (let i = 0; i < count; i++) {
|
||
particles.push(new Particle(x, y, color, type, 0));
|
||
}
|
||
// willow/sphere 中心加一颗白色闪光核心粒子
|
||
for (let i = 0; i < 10; i++) {
|
||
const p = new Particle(x, y, "#ffffff", "sphere", 0);
|
||
p.decay *= 2;
|
||
p.radius = 1;
|
||
particles.push(p);
|
||
}
|
||
}
|
||
return particles;
|
||
}
|
||
|
||
/**
|
||
* 启动烟花特效（普通版）
|
||
*
|
||
* @param {HTMLCanvasElement} canvas 全屏 Canvas
|
||
* @param {Function} onEnd 特效结束回调
|
||
*/
|
||
function start(canvas, onEnd) {
|
||
const ctx = canvas.getContext("2d");
|
||
const w = canvas.width;
|
||
const h = canvas.height;
|
||
const DURATION = 10000;
|
||
|
||
let rockets = [];
|
||
let particles = [];
|
||
let animId = null;
|
||
let launchCnt = 0;
|
||
const MAX_LAUNCHES = 12;
|
||
|
||
const launchInterval = setInterval(() => {
|
||
if (launchCnt >= MAX_LAUNCHES) {
|
||
clearInterval(launchInterval);
|
||
return;
|
||
}
|
||
const x = w * (0.15 + Math.random() * 0.7);
|
||
const ty = h * (0.08 + Math.random() * 0.45);
|
||
const color = COLORS[Math.floor(Math.random() * COLORS.length)];
|
||
const type = TYPES[Math.floor(Math.random() * TYPES.length)];
|
||
rockets.push(new Rocket(x, ty, color, type, h));
|
||
launchCnt++;
|
||
}, 600);
|
||
|
||
const startTime = performance.now();
|
||
|
||
function animate(now) {
|
||
ctx.clearRect(0, 0, w, h);
|
||
|
||
for (let i = rockets.length - 1; i >= 0; i--) {
|
||
const r = rockets[i];
|
||
if (r.done) {
|
||
const burst = _burst(r.x, r.y, r.color, r.type);
|
||
particles = particles.concat(burst);
|
||
rockets.splice(i, 1);
|
||
} else {
|
||
r.update();
|
||
r.draw(ctx);
|
||
}
|
||
}
|
||
|
||
particles = particles.filter((p) => p.alive);
|
||
particles.forEach((p) => {
|
||
p.update();
|
||
p.draw(ctx);
|
||
});
|
||
|
||
if (now - startTime < DURATION) {
|
||
animId = requestAnimationFrame(animate);
|
||
} else {
|
||
clearInterval(launchInterval);
|
||
cancelAnimationFrame(animId);
|
||
ctx.clearRect(0, 0, w, h);
|
||
onEnd();
|
||
}
|
||
}
|
||
|
||
animId = requestAnimationFrame(animate);
|
||
}
|
||
|
||
/**
|
||
* 启动婚礼加倍烟花特效（双侧轮流发射，粒子增倍，持续更久）
|
||
*
|
||
* @param {HTMLCanvasElement} canvas 全屏 Canvas
|
||
* @param {Function} onEnd 特效结束回调
|
||
*/
|
||
function startDouble(canvas, onEnd) {
|
||
const ctx = canvas.getContext("2d");
|
||
const w = canvas.width;
|
||
const h = canvas.height;
|
||
const DURATION = 12000; // 比普通多 2 秒
|
||
|
||
let rockets = [];
|
||
let particles = [];
|
||
let animId = null;
|
||
let launchCnt = 0;
|
||
const MAX_LAUNCHES = 24; // 双倍火箭数
|
||
|
||
// 婚礼专属浪漫色组（增加金色/粉色）
|
||
const WEDDING_COLORS = [
|
||
"#ff2266",
|
||
"#ff66aa",
|
||
"#ff99cc", // 粉红系
|
||
"#ffcc00",
|
||
"#ffdd44",
|
||
"#fff066", // 金黄系
|
||
"#cc44ff",
|
||
"#ff44cc",
|
||
"#aa00ff", // 紫色系
|
||
"#ff4400",
|
||
"#ff8800",
|
||
"#00ddff", // 其他
|
||
];
|
||
|
||
// 定时从左右两侧交替发射
|
||
const launchInterval = setInterval(() => {
|
||
if (launchCnt >= MAX_LAUNCHES) {
|
||
clearInterval(launchInterval);
|
||
return;
|
||
}
|
||
// 左右交替：偶数从左侧1/3，奇数从右侧2/3
|
||
const isLeft = launchCnt % 2 === 0;
|
||
const x = isLeft
|
||
? w * (0.05 + Math.random() * 0.4)
|
||
: w * (0.55 + Math.random() * 0.4);
|
||
const ty = h * (0.05 + Math.random() * 0.4);
|
||
const color =
|
||
WEDDING_COLORS[
|
||
Math.floor(Math.random() * WEDDING_COLORS.length)
|
||
];
|
||
const type = TYPES[Math.floor(Math.random() * TYPES.length)];
|
||
rockets.push(new Rocket(x, ty, color, type, h));
|
||
launchCnt++;
|
||
}, 400); // 发射间隔缩短到 400ms，密度加倍
|
||
|
||
// 额外：开场同时发射3枚双侧礼炮
|
||
setTimeout(() => {
|
||
[0.15, 0.5, 0.85].forEach((xRatio) => {
|
||
const color =
|
||
WEDDING_COLORS[
|
||
Math.floor(Math.random() * WEDDING_COLORS.length)
|
||
];
|
||
rockets.push(
|
||
new Rocket(w * xRatio, h * 0.1, color, "sphere", h),
|
||
);
|
||
});
|
||
}, 100);
|
||
|
||
const startTime = performance.now();
|
||
|
||
function animate(now) {
|
||
ctx.clearRect(0, 0, w, h);
|
||
|
||
for (let i = rockets.length - 1; i >= 0; i--) {
|
||
const r = rockets[i];
|
||
if (r.done) {
|
||
// 婚礼爆炸：粒子数×1.5（在 _burst 基础上额外补充50粒）
|
||
const burst = _burst(r.x, r.y, r.color, r.type);
|
||
// 额外补充粒子（心形/大颗）
|
||
for (let j = 0; j < 50; j++) {
|
||
const p = new Particle(r.x, r.y, r.color, "sphere", 0);
|
||
p.radius = Math.random() * 3 + 1;
|
||
burst.push(p);
|
||
}
|
||
particles = particles.concat(burst);
|
||
rockets.splice(i, 1);
|
||
} else {
|
||
r.update();
|
||
r.draw(ctx);
|
||
}
|
||
}
|
||
|
||
particles = particles.filter((p) => p.alive);
|
||
particles.forEach((p) => {
|
||
p.update();
|
||
p.draw(ctx);
|
||
});
|
||
|
||
if (now - startTime < DURATION) {
|
||
animId = requestAnimationFrame(animate);
|
||
} else {
|
||
clearInterval(launchInterval);
|
||
cancelAnimationFrame(animId);
|
||
ctx.clearRect(0, 0, w, h);
|
||
onEnd();
|
||
}
|
||
}
|
||
|
||
animId = requestAnimationFrame(animate);
|
||
}
|
||
|
||
return { start, startDouble };
|
||
})();
|