canvas-emoji-optimize

description

Since the original author no longer maintained it, I changed some logic based on canvas-emoji.

Installation

$ npm install -save canvas-emoji-optimize

By default, binaries for macOS, Linux and Windows will be downloaded. If you want to build from source, use npm install --build-from-source and see the Compiling section below.

The minimum version of Node.js required is 6.0.0.

Compiling

If you don't have a supported OS or processor architecture, or you use --build-from-source, the module will be compiled on your system. This requires several dependencies, including Cairo and Pango.

For detailed installation information, see the wiki. One-line installation instructions for common OSes are below. Note that libgif/giflib, librsvg and libjpeg are optional and only required if you need GIF, SVG and JPEG support, respectively. Cairo v1.10.0 or later is required.

OS	Command
OS X	Using Homebrew: brew install pkg-config cairo pango libpng jpeg giflib librsvg
Ubuntu	sudo apt-get install build-essential libcairo2-dev libpango1.0-dev libjpeg-dev libgif-dev librsvg2-dev
Fedora	sudo yum install gcc-c++ cairo-devel pango-devel libjpeg-turbo-devel giflib-devel
Solaris	pkgin install cairo pango pkg-config xproto renderproto kbproto xextproto
OpenBSD	doas pkg_add cairo pango png jpeg giflib
Windows	See the wiki
Others	See the wiki

Mac OS X v10.11+: If you have recently updated to Mac OS X v10.11+ and are experiencing trouble when compiling, run the following command: xcode-select --install. Read more about the problem on Stack Overflow. If you have xcode 10.0 or higher installed, in order to build from source you need NPM 6.4.1 or higher.

Quick Example

const { createCanvas } = require("canvas");
const { CanvasEmoji } = require("canvas-emoji");
const fs = require("fs");

function drawPngReplaceEmoji() {
    const canvas = createCanvas(800, 200);
    const canvasCtx = canvas.getContext("2d");
    const canvasEmoji = new CanvasEmoji(canvasCtx);
    const a = canvasEmoji.drawPngReplaceEmoji({
        text: "测试一下哦💋💃测试一下💋测试一下💋💃测试一下💋测试一下💋💃",
        fillStyle: "#000000",
        font: "bold 12px Impact",
        x: 0,
        y: 100,
        emojiW: 12,
        emojiH: 12,
        length: 20
    });
    const out = fs.createWriteStream(__dirname + "/test.png");
    const stream = canvas.createPNGStream();
    stream.pipe(out);
    out.on("finish", () => console.log("The PNG file was created."));
    return a;
}

async function drawPngReplaceEmojiWithEmojicdn() {
    const canvas = createCanvas(800, 200);
    const canvasCtx = canvas.getContext("2d");
    const canvasEmoji = new CanvasEmoji(canvasCtx);
    const a = await canvasEmoji.drawPngReplaceEmojiWithEmojicdn({
        text: "测试一下哦💋💃测试一下💋测试一下💋💃测试一下💋测试一下💋💃",
        fillStyle: "#000000",
        font: "bold 12px Impact",
        x: 0,
        y: 100,
        emojiW: 12,
        emojiH: 12,
        length: 20,
        emojiStyle: 'apple'
    });
    const out = fs.createWriteStream(__dirname + "/test2.png");
    const stream = canvas.createPNGStream();
    stream.pipe(out);
    out.on("finish", () => console.log("The PNG file was created."));
    return a;
}

console.log(drawPngReplaceEmoji());
drawPngReplaceEmojiWithEmojicdn();

Method

// Use local images, faster
drawPngReplaceEmoji(data: DrawPngReplaceEmojiParams): {x: number;}; 

// This method uses network pictures, and the style is more comprehensive
drawPngReplaceEmojiWithEmojicdn(data: DrawPngReplaceEmojiParams): Promise<{ x: number; }>;

参数

参数	描述	类型	是否必须	default
text	可能含有 emoji 表情的字符串	string	是
fillStyle	canvas 的 fillStyle	string	是
font	canvas 的 font	string	是
x	Canvas 坐标 x	number	是
y	Canvas 坐标 y	number	是
emojiW	emoji 表情的宽度	number	是
emojiH	emoji 表情的高度	number	是
length	如果字符太长后面会超过 length 大小的会用...表示	number	否
emojiStyle	emoji样式,only support drawPngReplaceEmojiWithEmojicdn()	string	否	google

Supported emojiStyle styles:

• apple
• google
• microsoft
• samsung
• whatsapp
• twitter
• facebook
• messenger
• joypixels
• openmoji
• emojidex
• lg
• htc
• mozilla

返回

字段	描述
x	完成后的 Canvas 坐标 x