这次给大家带来node操作文字生成图片,node操作文字生成图片的注意事项有哪些,下面就是实战案例,一起来看一下。
解决思路
文字转svg -> svg转png -> 合并图片
相关轮子
images Node.js 轻量级跨平台图像编解码库,不需要额外安装依赖
text-to-svg 文字转svg
svg2png svg转png图片
示例代码
'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));
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注意事项
text-to-svg需要中文字体的支持,不然中文会乱码
在我的破电脑上执行一次只花了500多毫秒,感觉足够了,分享出来希望能给大家一个参照
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