【已解决】使用echarts-convert.js生成图片的时候,怎么动态修改长和宽?
- echarts
- 时间:2023-06-08 00:16
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在使用echarts-convertjs生成图片的时候,想要动态的生成图片的大小,怎么设置?
查看echarts-convert.js源码:
可以看到,在config中设置了默认width和height是1000和600,那么怎么修改呢?
我们查看源码,查看到设置图片大小的是在:createChart这个方法中。而此方法又是被page.open方法调用的。
查看源码,可以看到width和height是从params中获取的。如果没有就使用config中配置的默认值。如下图:
那么,params的值又是从哪里来的呢?继续看源码:
是render方法中的。如下图:
继续跟源码:render方法又是在哪里被调用的呢?
在js的倒数第二行。如下图:
其中的params是调用了parseParams()方法获取的。如下图:
继续跟源码:
parseParams又调用了getParams()方法获取到data.如下图:
查看getParams方法。如下图:
可以发现,原来获取参数是从这里获取到的啊。而且是以“-”开头的。那么宽和高,入参怎么配置呢?
查看echarts-convert.js官方介绍,我们可以看到如下的:
就算不看官方文档,我们都已经知道是以“-”开头的,那么,我们就直接在parseParams方法中进行修改:
添加如上代码就可以了。
验证:
直接在CMD窗口,输入如下命令即可:
参数格式:
phantomjspath echarts-convvert.jspath -wideth 宽度值 -height 高度值 -infile 输入文件json路径 -outfile 输出png文件路径
参数1:phantomjs的完整路径。凯哥这里使用的是Windows的。所以就是phantomjs.exe的完整路径(包含文件名和后缀)
参数2:echarts-convvert.js的完整路径(包含文件名和后缀)
参数3:需要设置宽度大小
参数4:需要设置的高度大小
-infile 后面跟着的是json的完整路径(包含文件名和后缀)
-outfile 输出png的完整路径(包含文件名和后缀)
D:\files\test\dataReportFile\dataall>D:\files\test\createImagesoftware\phantomjs-2.1.1-windows\bin\phantomjs.exe D:\files\test\createImagesoftware\echarts-convert\echarts-convert1.js -width 1000 -height 400 -infile D:\files\test\dataReportFile\dataall\test.json -outfile D:\files\test\dataReportFile\dataall\test.png
需要注意:-width和-height的值是在convert.js后面跟着。别写错位置了
执行后,js中打印的console.log如下图:
执行命令后,可以看到图片已经被加载了。
查看图片属性,看看宽高大小:
图片的大小就是1000*400。而不是默认的1000*600.这样就可以动态的修改大小了
test.json数据如下:
{xAxis:{type:'category',data:['Mon','Tue','Wed','Thu','Fri','Sat','Sun']},yAxis:{type:'value'},series:[{data:[101,23,54,218,135,147,260],type:'line'}]}
生成后的图片:
扩展:
echarts-convert.js的源码:
(function() { var system = require('system'); var fs = require('fs'); var config = { // define the location of js files JQUERY : 'jquery-1.9.1.min.js', ECHARTS3 : 'echarts/echarts-all4.js', //ECHARTS3 : 'echarts.min_4.js', // default container width and height DEFAULT_WIDTH : '1000', DEFAULT_HEIGHT : '600' }, parseParams, render; usage = function() { console.log("\nUsage: phantomjs echarts-convert.js -options options -outfile filename -width width -height height" + "OR" + "Usage: phantomjs echarts-convert.js -infile URL -outfile filename -width width -height height\n"); }; pick = function() { var args = arguments, i, arg, length = args.length; for (i = 0; i < length; i += 1) { arg = args[i]; if (arg !== undefined && arg !== null && arg !== 'null' && arg != '0') { return arg; } } }; var base64Pad = '='; var toBinaryTable = [-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 62, -1, -1, -1, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, -1, -1, -1, 0, -1, -1, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, -1, -1, -1, -1, -1, -1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, -1, -1, -1, -1, -1 ]; base64ToString = function(data) { //console.log("data = "+data); var result = ''; var leftbits = 0; // number of bits decoded, but yet to be appended var leftdata = 0; // bits decoded, but yet to be appended // Convert one by one. for (var i = 0; i < data.length; i++) { var c = toBinaryTable[data.charCodeAt(i) & 0x7f]; //console.log("i = "+c); var padding = (data.charCodeAt(i) == base64Pad.charCodeAt(0)); // Skip illegal characters and whitespace if (c == -1) continue; // Collect data into leftdata, update bitcount leftdata = (leftdata << 6) | c; leftbits += 6; // If we have 8 or more bits, append 8 bits to the result if (leftbits >= 8) { leftbits -= 8; // Append if not padding. if (!padding) result += String.fromCharCode((leftdata >> leftbits) & 0xff); leftdata &= (1 << leftbits) - 1; } } console.log(result); // if (leftbits) // throw Components.Exception('Corrupted base64 string'); return result; }; getParams = function() { var map={}, i, key; if (system.args.length < 2) { usage(); phantom.exit(); } for (i = 0; i < system.args.length; i += 1) { if (system.args[i].charAt(0) === '-') { key = system.args[i].substr(1, i.length); console.log("kaigejava = "+key); if (key === 'infile') { key = 'path'; try { var vals = system.args[i + 1]; console.log("vals = "+vals); map[key] = vals; } catch (e) { console.log('Error: cannot find file, ' + system.args[i + 1]); phantom.exit(); } } else { map[key]= system.args[i + 1]; } } } //var DEFAULT_WIDTH = system.args[system.args.indexOf('-width') + 1] || 800; // var DEFAULT_HEIGHT = system.args[system.args.indexOf('-height') + 1] || 600; return map; }; parseParams = function() { var map = {}; var data= getParams(); console.log("datais-----"+data) var dataPath=data.path; //console.log("+++++dataPath++++++++") //console.log("dataPath-----"+dataPath) var fs = require('fs'); var str = fs.read(dataPath); map['options']=str; map['outfile']=data.outfile; //获取入参的宽和高 map['width']=data.width; map['height']=data.height; console.log("system.args width:"+data.width); console.log("system.args height:"+data.height); return map; }; render = function(params) { var page = require('webpage').create(), createChart; page.onConsoleMessage = function(msg) { console.log(msg); }; page.onAlert = function(msg) { console.log(msg); }; createChart = function(inputOption, width, height) { console.log("createChart-width:"+width+" .height:"+height); var counter = 0; function decrementImgCounter() { counter -= 1; if (counter < 1) { console.log(messages.imagesLoaded); } } function loadScript(varStr, codeStr) { var script = $('<script>').attr('type', 'text/javascript'); script.html('var ' + varStr + ' = ' + codeStr); document.getElementsByTagName("head")[0].appendChild(script[0]); if (window[varStr] !== undefined) { console.log('Echarts.' + varStr + ' has been parsed'); } } function loadImages() { var images = $('image'), i, img; if (images.length > 0) { counter = images.length; for (i = 0; i < images.length; i += 1) { img = new Image(); img.onload = img.onerror = decrementImgCounter; img.src = images[i].getAttribute('href'); } } else { console.log('The images have been loaded'); } } // load opitons if (inputOption != 'undefined') { // parse the options loadScript('options', inputOption); // disable the animation options.animation = false; } // we render the image, so we need set background to white. $(document.body).css('backgroundColor', 'white'); var container = $("<div>").appendTo(document.body); container.attr('id', 'container'); container.css({ width : width, height : height }); // render the chart var myChart = echarts.init(document.getElementById("container")); myChart.setOption(options); // load images loadImages(); }; // parse the params page.open("about:blank", function(status) { // inject the dependency js page.injectJs(config.JQUERY); page.injectJs(config.ECHARTS3); var width = pick(params.width, config.DEFAULT_WIDTH); var height = pick(params.height, config.DEFAULT_HEIGHT); console.log("create the chart width:"+width +" height:"+height) // create the chart page.evaluate(createChart, params.options, width, height); // define the clip-rectangle page.clipRect = { top : 0, left : 0, width : width, height : height }; // render the image page.render(params.outfile); //console.log('render complete:' + params.outfile); // exit phantom.exit(); }); }; // get the args var params = parseParams(); // validate the params if (params.options === undefined || params.options.length === 0) { // console.log("ERROR: No options or infile found."); usage(); phantom.exit(); } // set the default out file if (params.outfile === undefined) { var tmpDir = fs.workingDirectory + '/tmp'; // exists tmpDir and is it writable? if (!fs.exists(tmpDir)) { try { fs.makeDirectory(tmpDir); } catch (e) { // console.log('ERROR: Cannot make tmp directory'); } } params.outfile = tmpDir + "/" + new Date().getTime() + ".png"; } // render the image render(params); }());