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create-picture

v1.2.0

Published

该组件提供了 Canvas 的图片绘制与文本绘制功能,使用同步的语法完成异步绘制,简化原生 canvas 绘制语法。

Downloads

23

Readme

Canvas 图片绘制组件

该组件提供了 Canvas 的 图片绘制文本绘制 功能,使用同步的语法完成异步绘制,简化原生 canvas 绘制语法。

安装

使用 npm 安装:

npm i create-picture --save

导入 create-picture

import CreatePicture from 'create-picture';

使用

基础示例

// 初始化
const cp = new CreatePicture();

// 绘制图片,参数1为图片路径,其他参数与 CanvasRenderingContext2D.drawImage() 参数相同
cp.drawImage(require('../assets/save_bg.jpg'),0,0);

// 绘制文本
cp.drawText({content:'文本'});

// 获取合成图
cp.getPicture().then((picture)=>{
    // picture 为合成的 base 64
});

方法

  • new CreatePicture(); - 初始化,可接受一个对象参数
  • drawImage() - 绘制图片,第一个参数为图片路径,其他参数与 CanvasRenderingContext2D.drawImage() 参数相同
  • drawRepeatImage() - 绘制重复排列的图片
  • drawCirclePicture() - 绘制头像等圆形图片,与 drawImage 参数相同
  • drawText() - 绘制文本,返回文字宽度(可选)
  • getPicture().then((picture)=>{}); - 最终合成的图片

参数

new CreatePicture() 可选参数

  • width - 画布宽度,默认值 750
  • height - 画布高度,默认值 1448

drawImage() 可选参数

drawRepeatImage() 参数

  • 第一个参数为图片路径
  • 第二、三参数为平铺文件的宽高
  • 第四、五参数为要平铺的区域

drawCirclePicture() 可选参数

  • 第一个参数为图片路径
  • 其他参数与 CanvasRenderingContext2D.drawImage() 参数相同
  • 如需指定图片宽高,可以使用 9 个参数的方式,传入图片宽高未知可以传入 auto 自动获取
  • 示例
cp.drawCirclePicture(headimgurl,0,0,'auto','auto',50,50,80,80);

drawText() 可选参数

  • fontStyle - 文字样式,默认 normal
  • fontVariant - 文字变体,默认 normal
  • fontWeight - 文字宽度,默认 normal
  • fontSize - 文字宽度,默认 30
  • lineHeight - 文字行高,默认 normal
  • fontFamily - 字体,默认 Arial
  • left - 左对齐,默认 0
  • top - 上对齐,默认 300
  • maxWidth - 文字最大宽度,默认 undefined
  • content - 文本内容
  • textAlign - 对齐方式,默认 start
  • textBaseline - 文本基线,默认 alphabetic
  • direction - 文字方向,默认 inherit
  • color - 文字颜色,默认 #000000
  • rotation - 文字旋转角度,默认 0
  • width - 文字段落的宽度,超出自动换行,默认 undefined

getPicture() 可选参数

// 图片格式:jpg ,图片质量:0.6
getPicture('image/jpeg',0.6).then((picture)=>{})

// 图片格式:webp ,图片质量:0.8
getPicture('image/webp',0.8).then((picture)=>{})

示例

  • 示例代码
import CreatePicture from 'create-picture';

// 初始化
const cp:CreatePicture = new CreatePicture();

// 初始化(传参)
const cp:CreatePicture = new CreatePicture({width:750,height:1448});

// 绘制图片,参数1为图片路径,其他参数与 CanvasRenderingContext2D.drawImage() 参数相同
cp.drawImage(require('../assets/save_bg.jpg'),0,0);

// 绘制文本
cp.drawText({content:'文本'});

// 绘制文本,获取文字宽度
const textWidth = cp.drawText({
   content:'文本',
   fontSize: 30,
   top: 300,
   color: '#ffffff',
});

// 获取合成图
cp.getPicture().then((picture)=>{
   // picture 为合成的 base 64
});