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es-image-viewer

v1.0.1

Published

支持旋转,缩放,拖动

Downloads

10

Readme

es-image-viewer

JavaScript image viewer, support rotation, zoom and drag. 图片操作,支持旋转,缩放及拖动

安装

npm

npm i es-image-viewer --save

script

<script src="image-viewer.min.js"></script>

使用

npm

import imageViewer from 'es-image-viewer'

script

挂载在全局变量 imageViewer 下

API

initImage(imgDom, containerDom, options)

图片初始化

params

  • imgDom: 必须,操作图片dom
  • containerDom: 非必须,图片容器dom, 默认为图片dom父节点。用于计算与限制图片拖动范围
  • options: 非必须,可选配置
  • {
    • disableWheel: bool, // 禁用滚轮缩放,默认false
    • rotateStep: Number, // 旋转角度步进,默认90
    • scaleStep: Number, // 缩放步进,默认0.25(0.1在加减运算中计算不精确)
    • scaleRange: Array // 缩放约束范围,默认[0.5, 2]
  • }
var imgDom = document.getElementById('img');
var containerDom = document.getElementById('viewer');
imageViewer.initImage(imgDom, containerDom, {
    disableWheel: true
});

handleImage({type: 'string', inc: Number})

响应图片旋转,缩放操作

params

  • {
    • type: string, // 操作类型,支持'rotate'、'scale'
    • inc: Number // 操作增量,1为右旋或放大;-1为左旋或缩小
  • }
// 右旋转
imageViewer.handleImage({
    type: 'rotate',
    inc: 1
});

handleCallback(callbackFunc)

图片旋转,缩放操作回调

params

  • callbackFunc: function //回调执行函数

return

  • imageData
  • {
    • operateType: 'string', // 操作类型 'rotate' || 'scale'
    • rotate: Number, // 图片旋转角度
    • scale: Number, // 图片缩放比例
  • }
imageViewer.handleCallback(function (imageData) {
    console.log(imageData);
    // { operateType: 'rotate', rotate: 90, scale: 1}
})