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443 lines
11 KiB
443 lines
11 KiB
// Some non-bold Fraktur symbols are outside the contiguous block
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const frakturExceptions = {
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'C': '\u212d',
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'H': '\u210c',
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'I': '\u2111',
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'R': '\u211c',
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'Z': '\u2128'
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}
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// constants for decoding the update blob
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const SEQ_SET_COLOR_ATTR = 1
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const SEQ_REPEAT = 2
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const SEQ_SET_COLOR = 3
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const SEQ_SET_ATTR = 4
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const themes = [
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[
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'#111213',
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'#CC0000',
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'#4E9A06',
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'#C4A000',
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'#3465A4',
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'#75507B',
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'#06989A',
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'#D3D7CF',
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'#555753',
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'#EF2929',
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'#8AE234',
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'#FCE94F',
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'#729FCF',
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'#AD7FA8',
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'#34E2E2',
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'#EEEEEC'
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]
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]
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class TermScreen {
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constructor () {
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this.canvas = document.createElement('canvas')
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this.ctx = this.canvas.getContext('2d')
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if ('AudioContext' in window || 'webkitAudioContext' in window) {
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this.audioCtx = new (window.AudioContext || window.webkitAudioContext)()
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} else {
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console.warn('No AudioContext!')
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}
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this.cursor = {
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x: 0,
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y: 0,
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fg: 7,
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bg: 0,
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attrs: 0,
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blinkOn: false,
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visible: true,
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hanging: false,
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blinkInterval: null
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}
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this._colors = themes[0]
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this._window = {
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width: 0,
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height: 0,
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devicePixelRatio: 1,
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fontFamily: '"DejaVu Sans Mono", "Liberation Mono", "Inconsolata", ' +
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'monospace',
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fontSize: 20,
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gridScaleX: 1.0,
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gridScaleY: 1.2,
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blinkStyleOn: true,
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blinkInterval: null
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}
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this.windowState = {
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width: 0,
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height: 0,
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devicePixelRatio: 0,
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gridScaleX: 0,
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gridScaleY: 0,
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fontFamily: '',
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fontSize: 0
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}
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const self = this
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this.window = new Proxy(this._window, {
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set (target, key, value, receiver) {
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target[key] = value
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self.updateSize()
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self.scheduleDraw()
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return true
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}
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})
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this.screen = []
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this.screenFG = []
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this.screenBG = []
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this.screenAttrs = []
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this.resetBlink()
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this.resetCursorBlink()
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}
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get colors () { return this._colors }
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set colors (theme) {
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this._colors = theme
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this.scheduleDraw()
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}
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// schedule a draw in the next tick
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scheduleDraw () {
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clearTimeout(this._scheduledDraw)
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this._scheduledDraw = setTimeout(() => this.draw(), 1)
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}
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getFont (modifiers = {}) {
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let fontStyle = modifiers.style || 'normal'
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let fontWeight = modifiers.weight || 'normal'
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return `${fontStyle} normal ${fontWeight} ${
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this.window.fontSize}px ${this.window.fontFamily}`
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}
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getCharSize () {
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this.ctx.font = this.getFont()
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return {
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width: this.ctx.measureText(' ').width,
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height: this.window.fontSize
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}
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}
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updateSize () {
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this._window.devicePixelRatio = window.devicePixelRatio || 1
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let didChange = false
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for (let key in this.windowState) {
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if (this.windowState[key] !== this.window[key]) {
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didChange = true
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this.windowState[key] = this.window[key]
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}
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}
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if (didChange) {
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const {
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width, height, devicePixelRatio, gridScaleX, gridScaleY, fontSize
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} = this.window
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const charSize = this.getCharSize()
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this.canvas.width = width * devicePixelRatio * charSize.width * gridScaleX
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this.canvas.style.width = `${width * charSize.width * gridScaleX}px`
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this.canvas.height = height * devicePixelRatio * charSize.height *
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gridScaleY
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this.canvas.style.height = `${height * charSize.height * gridScaleY}px`
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}
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}
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resetCursorBlink () {
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clearInterval(this.cursor.blinkInterval)
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this.cursor.blinkInterval = setInterval(() => {
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this.cursor.blinkOn = !this.cursor.blinkOn
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this.scheduleDraw()
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}, 500)
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}
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resetBlink () {
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clearInterval(this.window.blinkInterval)
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let intervals = 0
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this.window.blinkInterval = setInterval(() => {
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intervals++
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if (intervals >= 4 && this.window.blinkStyleOn) {
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this.window.blinkStyleOn = false
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intervals = 0
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} else {
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this.window.blinkStyleOn = true
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intervals = 0
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}
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}, 200)
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}
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drawCell ({ x, y, charSize, cellWidth, cellHeight, text, fg, bg, attrs }) {
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const ctx = this.ctx
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ctx.fillStyle = this.colors[bg]
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ctx.globalCompositeOperation = 'destination-over'
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ctx.fillRect(x * cellWidth, y * cellHeight,
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Math.ceil(cellWidth), Math.ceil(cellHeight))
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ctx.globalCompositeOperation = 'source-over'
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let fontModifiers = {}
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let underline = false
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let blink = false
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let strike = false
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if (attrs & 1) fontModifiers.weight = 'bold'
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if (attrs & 1 << 1) ctx.globalAlpha = 0.5
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if (attrs & 1 << 2) fontModifiers.style = 'italic'
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if (attrs & 1 << 3) underline = true
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if (attrs & 1 << 4) blink = true
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if (attrs & 1 << 5) text = TermScreen.alphaToFraktur(text)
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if (attrs & 1 << 6) strike = true
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if (!blink || this.window.blinkStyleOn) {
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ctx.font = this.getFont(fontModifiers)
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ctx.fillStyle = this.colors[fg]
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ctx.fillText(text, (x + 0.5) * cellWidth, (y + 0.5) * cellHeight)
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if (underline || strike) {
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let lineY = underline
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? y * cellHeight * charSize.height
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: (y + 0.5) * cellHeight
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ctx.strokeStyle = this.colors[fg]
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ctx.lineWidth = 1
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ctx.moveTo(x * cellWidth, lineY)
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ctx.lineTo((x + 1) * cellWidth, lineY)
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ctx.stroke()
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}
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}
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ctx.globalAlpha = 1
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}
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draw () {
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const ctx = this.ctx
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const {
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width,
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height,
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devicePixelRatio,
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fontFamily,
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fontSize,
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gridScaleX,
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gridScaleY
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} = this.window
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const charSize = this.getCharSize()
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const cellWidth = charSize.width * gridScaleX
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const cellHeight = charSize.height * gridScaleY
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const screenWidth = width * cellWidth
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const screenHeight = height * cellHeight
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const screenLength = width * height
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ctx.setTransform(this.window.devicePixelRatio, 0, 0,
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this.window.devicePixelRatio, 0, 0)
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ctx.clearRect(0, 0, screenWidth, screenHeight)
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ctx.font = this.getFont()
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ctx.textAlign = 'center'
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ctx.textBaseline = 'middle'
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for (let cell = 0; cell < screenLength; cell++) {
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let x = cell % width
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let y = Math.floor(cell / width)
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let isCursor = this.cursor.x === x && this.cursor.y === y
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let text = this.screen[cell]
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let fg = isCursor ? this.screenBG[cell] : this.screenFG[cell]
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let bg = isCursor ? this.screenFG[cell] : this.screenBG[cell]
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let attrs = this.screenAttrs[cell]
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if (isCursor && fg === bg) bg = fg === 0 ? 7 : 0
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this.drawCell({
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x, y, charSize, cellWidth, cellHeight, text, fg, bg, attrs
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})
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}
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}
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loadContent (str) {
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// current index
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let i = 0
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// window size
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this.window.height = parse2B(str, i)
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this.window.width = parse2B(str, i + 2)
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this.updateSize()
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i += 4
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// cursor position
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let [cursorY, cursorX] = [parse2B(str, i), parse2B(str, i + 2)]
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i += 4
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let cursorMoved = (cursorX !== this.cursor.x || cursorY !== this.cursor.y)
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this.cursor.x = cursorX
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this.cursor.y = cursorY
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if (cursorMoved) this.resetCursorBlink()
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// attributes
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let attributes = parse2B(str, i)
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i += 2
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this.cursor.visible = !!(attributes & 1)
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this.cursor.hanging = !!(attributes & 1 << 0)
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Input.setAlts(
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!!(attributes & 1 << 2), // cursors alt
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!!(attributes & 1 << 3), // numpad alt
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!!(attributes & 1 << 4) // fn keys alt
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)
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let trackMouseClicks = !!(attributes & 1 << 5)
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let trackMouseMovement = !!(attributes & 1 << 6)
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Input.setMouseMode(trackMouseClicks, trackMouseMovement)
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let showButtons = !!(attributes & 1 << 7)
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let showConfigLinks = !!(attributes & 1 << 8)
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$('.x-term-conf-btn').toggleClass('hidden', !showConfigLinks)
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$('#action-buttons').toggleClass('hidden', !showButtons)
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// content
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let fg = 7
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let bg = 0
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let attrs = 0
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let cell = 0 // cell index
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let text = ' '
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let screenLength = this.window.width * this.window.height
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this.screen = new Array(screenLength).fill(' ')
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this.screenFG = new Array(screenLength).fill(' ')
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this.screenBG = new Array(screenLength).fill(' ')
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this.screenAttrs = new Array(screenLength).fill(' ')
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while (i < str.length && cell < screenLength) {
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let character = str[i++]
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let charCode = character.charCodeAt(0)
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if (charCode === SEQ_SET_COLOR_ATTR) {
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let data = parse3B(str, i)
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i += 3
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fg = data & 0xF
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bg = data >> 4 & 0xF
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attrs = data >> 8 & 0xFF
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} else if (charCode == SEQ_SET_COLOR) {
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let data = parse2B(str, i)
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i += 2
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fg = data & 0xF
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bg = data >> 4 & 0xF
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} else if (charCode === SEQ_SET_ATTR) {
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let data = parse2B(str, i)
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i += 2
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attrs = data & 0xFF
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} else if (charCode === SEQ_REPEAT) {
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let count = parse2B(str, i)
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i += 2
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for (let j = 0; j < count; j++) {
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this.screen[cell] = text
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this.screenFG[cell] = fg
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this.screenBG[cell] = bg
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this.screenAttrs[cell] = attrs
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if (++cell > screenLength) break
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}
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} else {
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// unique cell character
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this.screen[cell] = text = character
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this.screenFG[cell] = fg
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this.screenBG[cell] = bg
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this.screenAttrs[cell] = attrs
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cell++
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}
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}
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this.scheduleDraw()
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if (this.onload) this.onload()
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}
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/** Apply labels to buttons and screen title (leading T removed already) */
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loadLabels (str) {
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let pieces = str.split('\x01')
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qs('h1').textContent = pieces[0]
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$('#action-buttons button').forEach((button, i) => {
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var label = pieces[i + 1].trim()
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// if empty string, use the "dim" effect and put nbsp instead to
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// stretch the button vertically
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button.innerHTML = label ? e(label) : ' ';
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button.style.opacity = label ? 1 : 0.2;
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})
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}
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load (str) {
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const content = str.substr(1)
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switch (str[0]) {
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case 'S':
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this.loadContent(content)
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break
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case 'T':
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this.loadLabels(content)
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break
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case 'B':
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this.beep()
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break
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default:
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console.warn(`Bad data message type; ignoring.\n${
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JSON.stringify(content)}`)
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}
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}
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beep () {
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const audioCtx = this.audioCtx
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if (!audioCtx) return
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let osc, gain
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// main beep
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osc = audioCtx.createOscillator()
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gain = audioCtx.createGain()
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osc.connect(gain)
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gain.connect(audioCtx.destination);
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gain.gain.value = 0.5;
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osc.frequency.value = 750;
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osc.type = 'sine';
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osc.start();
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osc.stop(audioCtx.currentTime + 0.05);
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// surrogate beep (making it sound like 'oops')
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osc = audioCtx.createOscillator();
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gain = audioCtx.createGain();
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osc.connect(gain);
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gain.connect(audioCtx.destination);
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gain.gain.value = 0.2;
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osc.frequency.value = 400;
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osc.type = 'sine';
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osc.start(audioCtx.currentTime + 0.05);
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osc.stop(audioCtx.currentTime + 0.08);
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}
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static alphaToFraktur (character) {
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if ('a' <= character && character <= 'z') {
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character = String.fromCodePoint(0x1d51e - 0x61 + character.charCodeAt(0))
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} else if ('A' <= character && character <= 'Z') {
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character = frakturExceptions[character] || String.fromCodePoint(
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0x1d504 - 0x41 + character.charCodeAt(0))
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}
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return character
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}
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}
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const Screen = new TermScreen()
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let didAddScreen = false
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Screen.onload = function () {
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if (didAddScreen) return
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didAddScreen = true
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qs('#screen').appendChild(Screen.canvas)
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}
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