drpy-node/data/douyu/danmu.html at 3cb128c87225d14bd61f5b199bd1ab28bbf8c15b · hjdhnx/drpy-node · GitHub

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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>弹幕系统</title>
    <style>
        body {
            margin: 0;
            padding: 0;
            background: transparent;
            overflow: hidden;
        }
        #danmu-container {
            position: fixed;
            width: 100vw;
            height: 100vh;
            overflow: hidden;
            pointer-events: none;
        }
        .danmu-item {
            position: absolute;
            white-space: nowrap;
            font-size: 16px;
            line-height: 1.3;
            text-shadow: 1px 1px 2px rgba(0,0,0,0.7);
            will-change: transform;
            backface-visibility: hidden;
            pointer-events: auto;
        }
    </style>
</head>
<body>
    <div id="danmu-container"></div>
    <script>
    (function() {
        // 核心配置
        const CONFIG = {
            rowCount: 8,            // 弹幕行数
            rowHeight: 26,           // 行高
            baseSpeed: 150,          // 基准速度（px/s）
            maxLoad: 5,              // 单行最大负载
            speedBoost: 0.3,         // 速度增益系数
            spacingRatio: 0.6        // 间距比例
        };

        const container = document.getElementById('danmu-container');
        const socket = new WebSocket('ws://{{hostname}}/dy-dm');

        // 智能分配系统
        class SmartAllocator {
            constructor() {
                // 关键修改：初始化时固定行号从上到下
                this.rows = Array.from({length: CONFIG.rowCount}, (_, index) => ({
                    index: index,  // 行号0对应最上方
                    active: 0,
                    lastPos: 0,
                    speed: CONFIG.baseSpeed
                }));
                this.canvas = document.createElement('canvas');
                this.ctx = this.canvas.getContext('2d');
            }

            // 核心分配算法
            allocateRow(text) {
                const textWidth = this.measureText(text);

                // 第一阶段：寻找空行（优先上方）
                const emptyRows = this.rows
                    .filter(r => r.active === 0)
                    .sort((a, b) => a.index - b.index);  // 按行号升序排列

                if (emptyRows.length > 0) {
                    return emptyRows[0].index;
                }

                // 第二阶段：寻找最空闲行（优先上方）
                const minActive = Math.min(...this.rows.map(r => r.active));
                const candidateRows = this.rows
                    .filter(r => r.active === minActive)
                    .sort((a, b) => a.index - b.index);

                return candidateRows[0].index;
            }

            updateRow(rowIndex, delta) {
                const row = this.rows.find(r => r.index === rowIndex);
                row.active += delta;
                row.speed = CONFIG.baseSpeed * (1 + (row.active / CONFIG.maxLoad) * CONFIG.speedBoost);
                row.lastPos = Date.now();
            }

            measureText(text) {
                this.ctx.font = '16px sans-serif';
                return this.ctx.measureText(text).width;
            }
        }

        // 弹幕引擎（已修改）
        class DanmuEngine {
            constructor() {
                this.allocator = new SmartAllocator();
                this.elementPool = [];
            }

            launch(text) {
                const element = this.getElement(text);
                const textWidth = this.allocator.measureText(text);
                const row = this.allocator.allocateRow(text);

                this.allocator.updateRow(row, +1);
                this.animate(element, row, textWidth);
            }

            getElement(text) {
                const el = this.elementPool.pop() || document.createElement('div');
                el.className = 'danmu-item';
                el.textContent = text;
                el.style.color = `hsl(${Math.random()*360},70%,60%)`;
                return el;
            }

            animate(element, row, textWidth) {
                const startX = container.clientWidth;
                const yPos = row * CONFIG.rowHeight;  // 行号0对应最上方

                element.style.transform = `translateX(${startX}px)`;
                element.style.top = `${yPos}px`;
                container.appendChild(element);

                const speed = this.allocator.rows.find(r => r.index === row).speed;
                const startTime = Date.now();

                const animateFrame = () => {
                    const elapsed = Date.now() - startTime;
                    const progress = elapsed / ((startX + textWidth) / speed * 1000);

                    if (progress < 1) {
                        const x = startX - (startX + textWidth) * progress;
                        element.style.transform = `translateX(${x}px)`;
                        requestAnimationFrame(animateFrame);
                    } else {
                        this.recycle(element, row);
                    }
                };
                requestAnimationFrame(animateFrame);
            }

            recycle(element, row) {
                this.allocator.updateRow(row, -1);
                element.remove();
                this.elementPool.push(element);
            }
        }

        // 初始化系统
        const engine = new DanmuEngine();

        // WebSocket处理
        socket.onmessage = event => {
            const text = String(event.data).trim().substring(0, 100);
            text && engine.launch(text);
        };

        // 窗口自适应
        window.addEventListener('resize', () => {
            container.style.width = window.innerWidth + 'px';
            container.style.height = window.innerHeight + 'px';
        });

        window.addEventListener('beforeunload', () => {
            socket.close();
        });
    })();
    </script>
</body>
</html>