174 lines
6.4 KiB
JavaScript
174 lines
6.4 KiB
JavaScript
/**
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* Sense HAT 服务端
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*/
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require('dotenv').config() // 读取系统环境变量
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// HTTP状态测试路由
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const app = require('express')()
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app.get('/', (req, res) => res.sendStatus(200))
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// 启动HTTP服务
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const port = process.env.PORT || 3000
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const host = process.env.HOST || 'localhost'
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const server = app.listen(port, host, () => {
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console.log(`rpi sense hat server is running on port ${port}`)
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})
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// Sense HAT 初始化
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const sensehat = {
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led: {
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/*
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require('sense-hat-led').sync中包含以下方法：
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sleep(n) 暂停 n 秒
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clear() 清除所有
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clear(rgb) or clear([r,g,b]) 填充颜色
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setPixel(x,y,r,g,b) or setPixel(x,y,rgb) 设置一个点
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getPixel(x,y) 返回 [r,g,b] 获取一个点
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setPixels([[r,g,b]*64])
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getPixels() -> [[r,g,b]*64]
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flipH(redraw=true) 水平反转
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flipV(redraw=true) 垂直反转
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getter and setter rotation 默认为 0
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setRotation(r, redraw=true) 设置旋转，r 初始为 0，r 只能设置为 0/90/180/270
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loadImage(filePath, redraw=true)
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showLetter(character, textColour=[255,255,255], backColour=[0,0,0])
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showMessage(textString, scrollSpeed=0.1(秒), textColour=[255,255,255], backColour=[0,0,0])
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flashMessage(textString, speed=0.1(秒), textColour=[255,255,255], backColour=[0,0,0])
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# 未实现 # getter and setter lowLight 默认为 true
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# 未实现 # getter and setter gamma = Array of length 32 containing Integers between 0 and 31
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# 未实现 # gammaReset() 恢复默认 gamma
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*/
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...require('sense-hat-led').sync,
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get pixels() { return sensehat.led.getPixels() },
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},
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}
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sensehat.led.clear()
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sensehat.led.setRotation(180)
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sensehat.led.loadImage('images/heart.png')
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// socketio 服务
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const io = require('socket.io')(server, { cors: { origin: '*' } })
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io.on('connection', (client) => {
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// 初始化客户端led矩阵
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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// 处理客户端请求
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client.on('action', ({ action, color, x, y, pixels, image, character, delay, speed, background, text }) => {
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x = Number(x)
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y = Number(y)
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delay = Number(delay || 200)
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speed = Number(speed || 0.1)
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character = character || ' '
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background = background || [0, 0, 0]
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switch (action) {
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case 'clear':
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color = color || [0, 0, 0]
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sensehat.led.clear(color)
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io.emit('action', { action: 'clear', color })
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break
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case 'setPixel':
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if (color == undefined) color = [255, 255, 255]
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sensehat.led.setPixel(x, y, color)
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io.emit('action', { action: 'setPixel', x, y, color })
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break
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case 'getPixel':
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color = sensehat.led.getPixel(x, y)
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client.emit('action', { action: 'setPixel', x, y, color })
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break
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case 'setPixels':
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pixels.forEach((color, i) => {
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let x = i % 8
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let y = Math.floor(i / 8)
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sensehat.led.setPixel(x, y, color)
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})
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// for (let i = 0; i < pixels.length; i++) {
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// var color = pixels[i]
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// var x = i % 8
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// var y = Math.floor(i / 8)
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// }
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'getPixels':
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'flipH':
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sensehat.led.flipH()
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'flipV':
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sensehat.led.flipV()
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'turnLeft':
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var heading_angle = (Number(sensehat.led.rotation) + 90) % 360
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sensehat.led.rotation = heading_angle
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sensehat.led.setRotation(heading_angle)
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'turnRight':
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var heading_angle = (Number(sensehat.led.rotation) + 360 - 90) % 360
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sensehat.led.rotation = heading_angle
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sensehat.led.setRotation(heading_angle)
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'loadImage':
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try {
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sensehat.led.loadImage(`images/${image}.png`)
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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} catch (error) {
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console.error(error)
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}
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break
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case 'showLetter':
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if (color == undefined) color = [255, 255, 255]
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sensehat.led.showLetter(character, color, background)
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'showMessage':
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if (color == undefined) color = [255, 255, 255]
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sensehat.led.showMessage(text, speed, color, background)
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sensehat.led.clear()
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'flashMessage':
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if (color == undefined) color = [255, 255, 255]
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sensehat.led.flashMessage(text, speed, color, background)
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sensehat.led.clear()
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io.emit('action', { action: 'setPixels', pixels: sensehat.led.pixels })
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break
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case 'flash':
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if (color == undefined) color = [255, 255, 255]
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sensehat.led.clear(color)
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io.emit('action', { action: 'clear', color })
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setTimeout(() => {
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sensehat.led.clear()
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io.emit('action', { action: 'clear' })
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}, delay)
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break
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default:
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break
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}
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})
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})
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