This article mainly introduces the sample code for converting node text to images. The editor thinks it is quite good, so I will share it with you now and give it as a reference. Let’s follow the editor to take a look, I hope it can help everyone.
Today the boss made a request to generate an invitation card on the server. Well... To put it simply, you need this:
It became almost like this:
#The ruby guy on the backend made a html to convert the image, and said that it can be transferred It was too slow, so I took over this trap
So I messed around for a while before going to bed and came up with a simple implementation
Solution ideas
Convert text to svg -> svg to png -> Merge images
Related wheels
images Node.js lightweight cross-platform image editor Decoding library, no need to install additional dependencies
text-to-svg text to svg
svg2png svg to png image
Sample code
'use strict'; const fs = require('fs'); const images = require('images'); const TextToSVG = require('text-to-svg'); const svg2png = require("svg2png"); const Promise = require('bluebird'); Promise.promisifyAll(fs); const textToSVG = TextToSVG.loadSync('fonts/文泉驿微米黑.ttf'); const sourceImg = images('./i/webwxgetmsgimg.jpg'); const sWidth = sourceImg.width(); const sHeight = sourceImg.height(); const svg1 = textToSVG.getSVG('魏长青-人人讲App', { x: 0, y: 0, fontSize: 24, anchor: 'top', }); const svg2 = textToSVG.getSVG('邀请您参加', { x: 0, y: 0, fontSize: 16, anchor: 'top', }); const svg3 = textToSVG.getSVG('人人讲课程', { x: 0, y: 0, fontSize: 32, anchor: 'top', }); Promise.coroutine(function* generateInvitationCard() { const targetImg1Path = './i/1.png'; const targetImg2Path = './i/2.png'; const targetImg3Path = './i/3.png'; const targetImg4Path = './i/qrcode.jpg'; const [buffer1, buffer2, buffer3] = yield Promise.all([ svg2png(svg1), svg2png(svg2), svg2png(svg3), ]); yield Promise.all([ fs.writeFileAsync(targetImg1Path, buffer1), fs.writeFileAsync(targetImg2Path, buffer2), fs.writeFileAsync(targetImg3Path, buffer3), ]); const target1Img = images(targetImg1Path); const t1Width = target1Img.width(); const t1Height = target1Img.height(); const offsetX1 = (sWidth - t1Width) / 2; const offsetY1 = 200; const target2Img = images(targetImg2Path); const t2Width = target2Img.width(); const t2Height = target2Img.height(); const offsetX2 = (sWidth - t2Width) / 2; const offsetY2 = 240; const target3Img = images(targetImg3Path); const t3Width = target3Img.width(); const t3Height = target3Img.height(); const offsetX3 = (sWidth - t3Width) / 2; const offsetY3 = 270; const target4Img = images(targetImg4Path); const t4Width = target4Img.width(); const t4Height = target4Img.height(); const offsetX4 = (sWidth - t4Width) / 2; const offsetY4 = 400; images(sourceImg) .draw(target1Img, offsetX1, offsetY1) .draw(target2Img, offsetX2, offsetY2) .draw(target3Img, offsetX3, offsetY3) .draw(target4Img, offsetX4, offsetY4) .save('./i/card.png', { quality : 90 }); })().catch(e => console.error(e));
Notes
text-to-svg requires Chinese font support, otherwise the Chinese will be garbled
It only took more than 500 milliseconds to execute it once on my broken computer. I feel it is enough. I hope to share it to give everyone a reference.
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