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index.js
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index.js
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/*
* @Description: Custom Printing 自定义打印工具类
* @Author: richard1015
* @Date: 2019-01-02 10:03:25
* @LastEditTime: 2019-05-21 13:47:00
* @LastEditors: Please set LastEditors
*/
/* eslint-disable */
var $ = require("./jquery.min.js");
window.jQuery = $;
window.$ = $;
require("./jquery.print.js");
require('./jquery.jcanvas.js');
import html2canvas from "html2canvas";
export default {
//鼠标开始x
start_x: 0,
//鼠标开始y
start_y: 0,
//最终区域宽
area_width: 0,
//最终区域高
area_height: 0,
//默认画笔线宽
defaultStrokeWidth: 1,
//默认画笔颜色
defaultPenColor: "red",
//进行打印的canvas dom
printCanvasDom: {},
//是否打印指北针
defaultAddCompass:true,
//绘制打印区域
drawArea: function (documentId, options) {
if (typeof documentId === "string") {
var dom = document.getElementById(documentId);
if (dom.tagName == "CANVAS") {
this.printCanvasDom = dom;
return this.drawRect(options);
} else {
throw Error('documentId tag must is Canvas !')
}
} else {
throw Error('documentId must string and is Canvas tag!')
}
},
/**
* 绘制(选择打印区域)
* @param {object} options 绘制自定义参数
* @return {Pormise} 返回选定区域坐标
*/
drawRect: function (options) {
var that = this;
return new Promise((resolve, reject) => {
try {
that.penColor = options.penColor || that.defaultPenColor;
that.penWidth = options.strokeWidth || that.defaultStrokeWidth;
//创建全屏打印区域
var canvas = document.createElement('canvas');
// 网页可见区域宽设置
canvas.width = document.body.clientWidth
// 网页可见区域高设置
canvas.height = document.body.clientHeight
canvas.style = "position: absolute;left: 0;top: 0;"
document.body.appendChild(canvas);
//canvas 的矩形框
var canvasRect = canvas.getBoundingClientRect();
//矩形框的左上角坐标
var canvasLeft = canvasRect.left;
var canvasTop = canvasRect.top;
var x = 0;
var y = 0;
//鼠标点击按下事件,画图准备
canvas.onmousedown = function (e) {
//添加屏幕缩放比例window.devicePixelRatio
that.start_x = e.clientX*window.devicePixelRatio + that.defaultStrokeWidth
that.start_y = e.clientY*window.devicePixelRatio + that.defaultStrokeWidth
//设置画笔颜色和宽度
var color = that.penColor;
var penWidth = that.penWidth;
x = e.clientX - canvasLeft;
y = e.clientY - canvasTop;
$(canvas).addLayer({
type: 'rectangle',
strokeStyle: color,
strokeWidth: penWidth,
name: 'areaLayer',
fromCenter: false,
x: x, y: y,
width: 1,
height: 1
});
$(canvas).drawLayers();
$(canvas).saveCanvas();
//鼠标移动事件,画图
canvas.onmousemove = function (e) {
that.area_width = e.clientX*window.devicePixelRatio - that.start_x - that.defaultStrokeWidth
that.area_height = e.clientY*window.devicePixelRatio - that.start_y - that.defaultStrokeWidth
var width = e.clientX - canvasLeft - x;
var height = e.clientY - canvasTop - y;
$(canvas).removeLayer('areaLayer');
$(canvas).addLayer({
type: 'rectangle',
strokeStyle: color,
strokeWidth: penWidth,
name: 'areaLayer',
fromCenter: false,
x: x, y: y,
width: width,
height: height
});
$(canvas).drawLayers();
}
};
//鼠标抬起
canvas.onmouseup = function (e) {
var color = that.penColor;
var penWidth = that.penWidth;
canvas.onmousemove = null;
//添加屏幕缩放比例window.devicePixelRatio
var width = e.clientX*window.devicePixelRatio - canvasLeft - x;
var height = e.clientY*window.devicePixelRatio - canvasTop - y;
$(canvas).removeLayer('areaLayer');
$(canvas).addLayer({
type: 'rectangle',
strokeStyle: color,
strokeWidth: penWidth,
name: 'areaLayer',
fromCenter: false,
x: x, y: y,
width: width,
height: height
});
$(canvas).drawLayers();
$(canvas).saveCanvas();
$(canvas).removeLayer('areaLayer');
//删除画笔区域
document.body.removeChild(canvas);
resolve(that.printClip());
}
} catch (error) {
reject(error)
}
});
},
/**
* 将需要打印的canvas进行裁剪,在drawRect方法我们已经 得到 裁剪坐标
* @returns {string} clipImgBase64
*/
printClip() {
var that = this;
console.log(`print canvas dom area width : ${that.printCanvasDom.width} height: ${that.printCanvasDom.height}`)
//创建裁剪canvas
var clipCanvas = document.createElement('canvas')
console.log('实际打印区域', that.start_x, that.start_y, that.area_width, that.area_height)
//设置实际打印区域宽高
clipCanvas.width = that.area_width
clipCanvas.height = that.area_height
//按坐标进行裁剪
clipCanvas.getContext('2d').drawImage(that.printCanvasDom, that.start_x, that.start_y, that.area_width, that.area_height, 0, 0, that.area_width, that.area_height)
//实际打印 imgbase64码
return clipCanvas.toDataURL();
},
/**
* 设置打印参数
* @param {*} clipImgBase64
*/
print(clipImgBase64, options) {
var that = this;
//打印dom外壳创建
var div = document.createElement("div");
var clipImg = new Image()
clipImg.src = clipImgBase64;
// clipImg.style = `width:${that.area_width}px;height:${that.area_height}px;`
// 宽大于高 > 则把宽度放到100% 进行等比例缩放 , 高大于宽 > 则把高放到90% (10%预留指北针 和 标题区域) 进行等比例缩放;
if (that.area_width > that.area_height) {
clipImg.style = `width: 100%;
height:auto;
max-width: 100%;
max-height: 100%;`;
} else {
clipImg.style = `width: auto;
height: 90%;
max-width: 100%;
max-height: 100%;`;
}
//添加实际打印图
div.appendChild(clipImg);
//获取 cesium-navigation 插件,目的将指北针拼接打印
//此处获取 指北针dom元素进行 拼接打印
let isAddCompass =
options.isAddCompass === undefined || options.isAddCompass === null
? that.defaultAddCompass
: options.isAddCompass;
if (navigationDom.length && isAddCompass) {
html2canvas(navigationDom[0], {
scale: 1,
allowTaint: false,
logging: true,
useCORS: true
}).then(canvas => {
let img = canvas.toDataURL("image/jpeg")
img = img.replace('data:image/jpeg;base64,', '')
let finalImageSrc = 'data:image/jpeg;base64,' + img
var clipImg1 = new Image()
clipImg1.src = finalImageSrc;
clipImg1.style = "position: absolute;right: 0px;top: 0px;width:8%;height:auto;";
//打印壳子添加指北针图
div.appendChild(clipImg1);
that.printCustomSize(div, options);
});
} else {
that.printCustomSize(div, options);
}
},
printCustomSize(div, options) {
// 高 宽
// A0:1189mm * 841mm
// A1:841mm * 594mm
// A2:594mm * 420mm
// A3:420mm * 297mm
// A4:297mm * 210mm
// 页边距: 0.75 inch
// A1: 23.39x33.11 inch
// 打印机DPI:300DPI
// 屏幕DPI : 96DPI
// width = (23.39 - 0.75 * 2) * 96 = 2101 px
// height = (33.11 - 0.75 * 2)* 96 = 3034 px
// A4: 8.27x11.69 inch
// 打印机DPI:300DPI
// 屏幕DPI : 96DPI
// width = (8.27 - 0.75 * 2) * 96 = 650 px
// height = (11.69 - 0.75 * 2)* 96 = 978 px
// 所以,当<table> 的width=650px, height=978px时,用IE 打印时,刚好能打印一页的A4纸.
//a1横向打印尺寸
// var a1 = { width: "3034", height: "2101" };
//a4横向打印尺寸
var a4 = { width: "978", height: "650" };
if (typeof options.downLoadEnable !== 'boolean') {
options.downLoadEnable = true;
}
var pageWidth = options.width || a4.width,
pageHeight = options.height || a4.height,
title = options.title || 'printTitle',
downLoadEnable = options.downLoadEnable,
fontSize = options.fontSize || '28';
div.style = `width: ${pageWidth}px;
height: ${pageHeight}px;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
position: relative;`;
var h1 = document.createElement('h1')
h1.innerHTML = title;
h1.style = `font-size:${fontSize}px;margin:10px 0;text-align:center;width:100%;`;
div.insertBefore(h1, div.firstChild);
if (downLoadEnable) {
this.downLoadFile(div, title, pageWidth, pageHeight);
} else {
// 打印文档
$(div).print({
globalStyles: false,
width: pageWidth,
height: pageHeight,
});
}
},
downLoadFile(obj, filename, pageWidth, pageHeight) {
var that = this;
return new Promise((resolve, reject) => {
document.body.appendChild(obj);
html2canvas(obj).then(canvas => {
//删除画笔区域
document.body.removeChild(obj);
var base64Img = canvas.toDataURL("image/png"); //base64数据
//打印下载后的图片
var printImgObj = new Image()
printImgObj.src = base64Img;
printImgObj.style = `width: ${pageWidth}px;height: ${pageHeight}px;`
printImgObj.onload = function () {
$(this).print({
width: pageWidth,
height: pageHeight,
globalStyles: false,
});
}
resolve(true)
//由于base64过长,转blob进行a标签下载
that.dataURIToBlob(base64Img, function (blob) {
var a = document.createElement('a');
a.download = filename + '.png';
a.innerHTML = 'download';
// the string representation of the object URL will be small enough to workaround the browser's limitations
a.href = URL.createObjectURL(blob);
// you must revoke the object URL,
// but since we can't know when the download occured, we have to attach it on the click handler..
// a.onclick = function () {
// // ..and to wait a frame
// requestAnimationFrame(function () {
// URL.revokeObjectURL(a.href);
// });
// a.removeAttribute('href')
// };
var event = document.createEvent('MouseEvents');
event.initMouseEvent('click', true, false, window, 0, 0, 0, 0, 0, false, false, false, false, 0, null);
a.dispatchEvent(event);
});
});
})
},
// 解决base64文件过大时 图片下载失败问题
// edited from https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/toBlob#Polyfill
dataURIToBlob(dataURI, callback) {
var binStr = atob(dataURI.split(',')[1]),
len = binStr.length,
arr = new Uint8Array(len);
for (var i = 0; i < len; i++) {
arr[i] = binStr.charCodeAt(i);
}
callback(new Blob([arr]));
}
}