I'm trying to write some text on a simple jpg or png with nodejs and JIMP but i'm having issues on making it work. The picture is gotten from a telegram bot, it gets merged with another picture with canvas and then i must write some simple text on it.
Here is my code:
const Jimp = require("jimp");
var imageCaption = 'WRITE THIS ON PICTURE';
var loadedImage;
const image = await Jimp.read(finalCanvas)
.then(function (image) {
loadedImage = image;
return Jimp.loadFont(Jimp.FONT_SANS_16_BLACK);
})
.then(function (font) {
loadedImage.print(font, 10, 10, imageCaption)
.write(finalCanvas);
})
.catch(function (err) {
console.error(err);
});
I keep getting an error about a matching contstructor overloading not found. Also had troubles getting JIMP read my local files.
Complete error i get:
Error: No matching constructor overloading was found. Please see the docs for how to call the Jimp constructor.
at Jimp.throwError (/home/smp0/ifsbadge/node_modules/@jimp/utils/dist/index.js:33:13)
at new Jimp (/home/smp0/ifsbadge/node_modules/@jimp/core/dist/index.js:412:85)
at _construct (/home/smp0/ifsbadge/node_modules/@babel/runtime/helpers/construct.js:19:21)
at /home/smp0/ifsbadge/node_modules/@jimp/core/dist/index.js:926:32
at new Promise (<anonymous>)
at Function.Jimp.read (/home/smp0/ifsbadge/node_modules/@jimp/core/dist/index.js:925:10)
at TelegramBot.<anonymous> (/home/smp0/ifsbadge/index.js:51:32)
at processTicksAndRejections (internal/process/task_queues.js:93:5) {
methodName: 'constructor'
}
Complete context:
var needle = require('needle');
const Telegram = require('node-telegram-bot-api')
const { createCanvas, loadImage, ImageData } = require('canvas')
var Jimp = require("jimp");
var fs = require('fs');
const factions = {}
token="1234:BLABLA"
const bot = new Telegram(token, { polling: true })
bot.on('message', async (msg) => {
if (msg.photo) {
if (factions[msg.chat.id]) {
console.log(`Generating badge for ${msg.from.first_name} (${msg.from.username})...`)
bot.sendChatAction(msg.chat.id, 'upload_photo').catch(console.error)
const pictureCanvas = createCanvas(559, 772)
const pictureCtx = pictureCanvas.getContext('2d')
const { file_path } = await bot.getFile(msg.photo[msg.photo.length - 1].file_id)
const picture = await loadImage(`https://api.telegram.org/file/bot${token}/${file_path}`)
// PICTURE CALCULATIONS
pheight = picture.height
pwidth = picture.width
aspectratiow = (pwidth/pheight)
aspectratioh = (pheight/pwidth)
oheight = pheight*aspectratioh
owidth = (pwidth) / (pwidth/559)
newheight = 559*pheight/pwidth
var scale = Math.min(559/pwidth, 772/pheight);
var posx = (559 / 2) - (559 / 2) * scale;
var posy = (772 / 2) - (pheight / 2) * scale;
// END OF CALCULATIONS
// MERGING TWO PICTURES
pictureCtx.drawImage(picture, 10 , posy, 559, newheight)
const finalCanvas = createCanvas(559, 772)
const finalCtx = finalCanvas.getContext('2d')
const frame = await loadImage(`./frames/${factions[msg.chat.id]}.png`)
finalCtx.drawImage(pictureCanvas, 0, 0, 559, 772)
finalCtx.drawImage(frame, 0, 0, 559, 772)
factions[msg.chat.id] = null
// END OF MERGING PICTURES
//APPLYING TEXT ON PICTURE
const Jimp = require("jimp");
var imageCaption = 'WRITE THIS ON PICTURE';
var loadedImage;
const image = await Jimp.read(finalCanvas)
.then(function (image) {
loadedImage = image;
return Jimp.loadFont(Jimp.FONT_SANS_16_BLACK);
})
.then(function (font) {
loadedImage.print(font, 10, 10, imageCaption)
.write(finalCanvas);
})
.catch(function (err) {
console.error(err);
});
//END OF APPLYING TEXT ON PICTURE
bot.sendPhoto(msg.chat.id, finalCanvas.toBuffer('image/jpeg', { quality: 1 }))
} else {
bot.sendMessage(msg.chat.id, 'Write /enl1 /enl2 /enl3 o /res1 /res2 /res3 o /xf1 /xf2 !').catch(console.log)
}
}
})
bot.onText(/\/start/, async (msg) => {
bot.sendMessage(msg.chat.id, "Welcome! Select your badge Write /enl1 /enl2 /enl3 o /res1 /res2 /res3 o /xf1 /xf2 !").catch(console.log)
})
bot.onText(/\/(enl1|enl2|enl3|res1|res2|res3|xf1|xf2)/, async (msg, match) => {
factions[msg.chat.id] = match[1]
bot.sendMessage(msg.chat.id, 'Good! Now send me your picture').catch(console.log)
})
srcs on github: https://github.com/pedrofracassi/badgemaker and https://github.com/FerdinandoLM/IngressFSBadgeMaker
From what I can see, finalCanvas
is an instance of Canvas
. I don't think Jimp
would take an instance of Canvas
, but Canvas#toBuffer()
might be the thing you want as Jimp
would take a buffer: Jimp.read(finalCanvas.toBuffer())
Both http.get
and response.pipe(writeStream)
are asynchronous. At the time you try Jimp.read
, the file isn't in the file system yet or it is not completely written onto disk.
To do it after file is written, listen to finish
event.
file.on('finish', async () => {
await Jump.read(...);
});
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