mirror of
https://github.com/the1812/Bilibili-Evolved.git
synced 2025-11-04 21:22:45 +08:00
187 lines
7.7 KiB
JavaScript
187 lines
7.7 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const danmaku_1 = require("./danmaku");
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// interface MeasureText {
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// width(text: string, options: {
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// 'font-family': string
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// }): number
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// }
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const measureText = require("bezoerb-measure-text");
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class DanmakuStack {
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constructor(font, resolution, duration, bottomMarginPercent) {
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this.horizontalStack = [];
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this.horizontalTrack = [];
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this.verticalStack = [];
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this.verticalTrack = [];
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this.resolution = resolution;
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this.duration = duration;
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// XML字体大小到实际大小的表
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this.fontSizes = {
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30: `64px ${font}`,
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25: `52px ${font}`,
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18: `36px ${font}`
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};
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this.bottomMarginPercent = bottomMarginPercent;
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this.generateTracks();
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}
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generateTracks() {
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const height = 52;
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this.danmakuHeight = height;
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this.trackHeight = DanmakuStack.margin * 2 + height;
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this.trackCount = parseInt(fixed(this.resolution.y * (1 - this.bottomMarginPercent) / this.trackHeight, 0));
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}
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getTextSize(danmaku) {
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const font = this.fontSizes[danmaku.fontSize];
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const width = measureText.width(danmaku.content, { 'font-family': font });
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const x = width / 2;
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return [x, this.danmakuHeight / 2];
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}
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getTags(danmaku, { targetTrack, initTrackNumber, nextTrackNumber, willOverlay, getTrackItem, getTag }) {
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const [x, y] = this.getTextSize(danmaku);
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const width = x * 2;
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/*
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x = this.resolution.x = 屏幕宽度
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d = this.duration(danmaku) = 当前弹幕总持续时长(从出现到完全消失)
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w = width = 当前弹幕的宽度
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delay = DanmakuStack.nextDanmakuDelay = 相邻弹幕间最小的时间间隔
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当前弹幕的速度 v = (x + w) / d
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完全进入屏幕所需时间 = visibleTime = delay + w / v = delay + wd / (x + w)
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*/
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const visibleTime = this.duration(danmaku) * width / (this.resolution.x + width) + DanmakuStack.nextDanmakuDelay;
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let trackNumber = initTrackNumber;
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let overlayDanmaku = null;
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// 寻找前面已发送的弹幕中可能重叠的
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do {
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overlayDanmaku = targetTrack.find(it => willOverlay(it, trackNumber, width));
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trackNumber += nextTrackNumber;
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} while (overlayDanmaku && trackNumber <= this.trackCount && trackNumber >= 0);
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// 如果弹幕过多, 此条就不显示了
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if (trackNumber > this.trackCount || trackNumber < 0) {
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return `\\pos(0,-999)`;
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}
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trackNumber -= nextTrackNumber; // 减回最后的自增
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targetTrack.push(getTrackItem(trackNumber, width, visibleTime));
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return getTag({ trackNumber, x, y });
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}
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getHorizontalTags(danmaku) {
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return this.getTags(danmaku, {
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targetTrack: this.horizontalTrack,
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initTrackNumber: 0,
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nextTrackNumber: 1,
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willOverlay: (it, trackNumber, width) => {
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if (it.trackNumber !== trackNumber) { // 不同轨道当然不会重叠
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return false;
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}
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if (it.width < width) { // 弹幕比前面的弹幕长, 必须等前面弹幕走完
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/*
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x = this.resolution.x = 屏幕宽度
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d = this.duration(danmaku) = 当前弹幕总持续时长(从出现到完全消失)
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w = width = 当前弹幕的宽度
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end = it.end = 前面的弹幕结束时间点
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start = danmaku.startTime = 当前弹幕的开始时间点
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当前弹幕的速度 v = (x + w) / d
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当前弹幕碰到左侧边缘需要的时间 ▲t = x / v = dx / (x + w)
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当前弹幕碰到左侧边缘的时间点 t = ▲t + start
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如果会重叠, 则当前弹幕碰到左边缘时, 前面的弹幕还未结束
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即 t <= end
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也就是 start + dx / (x + w) <= end 或 dx / (x + w) <= end - start
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*/
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return this.duration(danmaku) * this.resolution.x / (this.resolution.x + width) <= it.end - danmaku.startTime;
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}
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else { // 前面弹幕完全进入屏幕的时间点晚于当前弹幕的开始时间, 就一定会重叠
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return it.visible > danmaku.startTime;
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}
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},
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getTrackItem: (trackNumber, width, visibleTime) => {
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return {
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width: width,
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start: danmaku.startTime,
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visible: danmaku.startTime + visibleTime,
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end: danmaku.startTime + this.duration(danmaku),
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trackNumber
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};
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},
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getTag: ({ trackNumber, x, y }) => {
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return `\\move(${this.resolution.x + x},${trackNumber * this.trackHeight + DanmakuStack.margin + y},${-x},${trackNumber * this.trackHeight + DanmakuStack.margin + y},0,${this.duration(danmaku) * 1000})`;
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}
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});
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}
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getVerticalTags(danmaku) {
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const isTop = DanmakuStack.danmakuType[danmaku.type] === 'top';
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return this.getTags(danmaku, {
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targetTrack: this.verticalTrack,
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initTrackNumber: isTop ? 0 : this.trackCount - 1,
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nextTrackNumber: isTop ? 1 : -1,
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willOverlay: (it, trackNumber) => {
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if (it.trackNumber !== trackNumber) {
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return false;
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}
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return it.end > danmaku.startTime;
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},
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getTrackItem: (trackNumber) => {
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return {
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start: danmaku.startTime,
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end: danmaku.startTime + this.duration(danmaku),
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trackNumber
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};
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},
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getTag: ({ trackNumber, y }) => {
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if (isTop) {
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return `\\pos(${this.resolution.x / 2},${trackNumber * this.trackHeight + DanmakuStack.margin + y})`;
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}
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else {
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return `\\pos(${this.resolution.x / 2},${this.resolution.y - DanmakuStack.margin - y - (this.trackCount - 1 - trackNumber) * this.trackHeight})`;
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}
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}
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});
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}
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push(danmaku) {
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let tags = '';
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let stack = [];
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switch (DanmakuStack.danmakuType[danmaku.type]) {
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case 'normal':
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case 'reversed': // 反向先鸽了, 直接当正向了
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{
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tags = this.getHorizontalTags(danmaku);
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stack = this.horizontalStack;
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break;
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}
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case 'top':
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case 'bottom':
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{
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tags = this.getVerticalTags(danmaku);
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stack = this.verticalStack;
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break;
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}
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case 'special': // 高级弹幕也鸽了先
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default:
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{
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return {
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tags: `\\pos(0,-999)`
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};
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}
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}
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const info = {
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tags
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};
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stack.push(info);
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return info;
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}
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}
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DanmakuStack.danmakuType = {
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[danmaku_1.DanmakuType.Normal]: 'normal',
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[danmaku_1.DanmakuType.Normal2]: 'normal',
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[danmaku_1.DanmakuType.Normal3]: 'normal',
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[danmaku_1.DanmakuType.Bottom]: 'bottom',
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[danmaku_1.DanmakuType.Top]: 'top',
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[danmaku_1.DanmakuType.Reversed]: 'reversed',
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[danmaku_1.DanmakuType.Special]: 'special',
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[danmaku_1.DanmakuType.Special2]: 'special'
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};
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DanmakuStack.margin = 4;
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DanmakuStack.nextDanmakuDelay = 0.05;
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exports.DanmakuStack = DanmakuStack;
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