echarts 中使用中國地圖 前臺除錯工具持續報錯： Uncaught DOMException: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The image argument is a canvas element with a width or height of 0，
阿新 • • 發佈：2020-08-15
問題背景：
因為自己需要，展示中國地圖的航飛路線， 在製作大屏的過程中 需要在中心的位置
初始如下圖：
現在想要將重心位置放置一個模擬飛行航線的地圖 Echarts連結：https://gallery.echartsjs.com/editor.html?c=x0-ExSkZDM，開啟連結 可見 如下圖
想要將這個圖新增到大屏的中央位置
程式碼如下：
HTML部分
<!--中間下方的地圖模組-->
<div class="map">
<div class="map1"></div>
<div class
index.js部分
(function (){
var myChart = echarts.init(document.querySelector(".map .chart"));
var geoCoordMap = {'上海': [121.4648,31.2891],
'東莞': [113.8953,22.901],
'東營': [118.7073,37.5513],
'中山': [113.4229,22.478],
'臨汾': [111.4783,36.1615],
'臨沂': [118.3118,35.2936],
'丹東': [124.541,40.4242],
'麗水': [119.5642,28.1854],
'烏魯木齊': [87.9236,43.5883],
'佛山': [112.8955,23.1097],'保定': [115.0488,39.0948],
'蘭州': [103.5901,36.3043],
'包頭': [110.3467,41.4899],
'北京': [116.4551,40.2539],
'北海': [109.314,21.6211],
'南京': [118.8062,31.9208],
'南寧': [108.479,23.1152],
'南昌': [116.0046,28.6633],
'南通': [121.1023,32.1625],
'廈門': [118.1689,24.6478],
'台州': [121.1353,28.6688],
'合肥': [117.29,32.0581],
'呼和浩特': [111.4124,40.4901],
'咸陽': [108.4131,34.8706],
'哈爾濱': [127.9688,45.368],
'唐山': [118.4766,39.6826],
'嘉興': [120.9155,30.6354],
'大同': [113.7854,39.8035],
'大連': [122.2229,39.4409],
'天津': [117.4219,39.4189],
'太原': [112.3352,37.9413],
'威海': [121.9482,37.1393],
'寧波': [121.5967,29.6466],
'寶雞': [107.1826,34.3433],
'宿遷': [118.5535,33.7775],
'常州': [119.4543,31.5582],
'廣州': [113.5107,23.2196],
'廊坊': [116.521,39.0509],
'延安': [109.1052,36.4252],
'張家口': [115.1477,40.8527],
'徐州': [117.5208,34.3268],
'德州': [116.6858,37.2107],
'惠州': [114.6204,23.1647],
'成都': [103.9526,30.7617],
'揚州': [119.4653,32.8162],
'承德': [117.5757,41.4075],
'拉薩': [91.1865,30.1465],
'無錫': [120.3442,31.5527],
'日照': [119.2786,35.5023],
'昆明': [102.9199,25.4663],
'杭州': [119.5313,29.8773],
'棗莊': [117.323,34.8926],
'柳州': [109.3799,24.9774],
'株洲': [113.5327,27.0319],
'武漢': [114.3896,30.6628],
'汕頭': [117.1692,23.3405],
'江門': [112.6318,22.1484],
'瀋陽': [123.1238,42.1216],
'滄州': [116.8286,38.2104],
'河源': [114.917,23.9722],
'泉州': [118.3228,25.1147],
'泰安': [117.0264,36.0516],
'泰州': [120.0586,32.5525],
'濟南': [117.1582,36.8701],
'濟寧': [116.8286,35.3375],
'海口': [110.3893,19.8516],
'淄博': [118.0371,36.6064],
'淮安': [118.927,33.4039],
'深圳': [114.5435,22.5439],
'清遠': [112.9175,24.3292],
'溫州': [120.498,27.8119],
'渭南': [109.7864,35.0299],
'湖州': [119.8608,30.7782],
'湘潭': [112.5439,27.7075],
'濱州': [117.8174,37.4963],
'濰坊': [119.0918,36.524],
'煙臺': [120.7397,37.5128],
'玉溪': [101.9312,23.8898],
'珠海': [113.7305,22.1155],
'鹽城': [120.2234,33.5577],
'盤錦': [121.9482,41.0449],
'石家莊': [114.4995,38.1006],
'福州': [119.4543,25.9222],
'秦皇島': [119.2126,40.0232],
'紹興': [120.564,29.7565],
'聊城': [115.9167,36.4032],
'肇慶': [112.1265,23.5822],
'舟山': [122.2559,30.2234],
'蘇州': [120.6519,31.3989],
'萊蕪': [117.6526,36.2714],
'菏澤': [115.6201,35.2057],
'營口': [122.4316,40.4297],
'葫蘆島': [120.1575,40.578],
'衡水': [115.8838,37.7161],
'衢州': [118.6853,28.8666],
'西寧': [101.4038,36.8207],
'西安': [109.1162,34.2004],
'貴陽': [106.6992,26.7682],
'連雲港': [119.1248,34.552],
'邢臺': [114.8071,37.2821],
'邯鄲': [114.4775,36.535],
'鄭州': [113.4668,34.6234],
'鄂爾多斯': [108.9734,39.2487],
'重慶': [107.7539,30.1904],
'金華': [120.0037,29.1028],
'銅川': [109.0393,35.1947],
'銀川': [106.3586,38.1775],
'鎮江': [119.4763,31.9702],
'長春': [125.8154,44.2584],
'長沙': [113.0823,28.2568],
'長治': [112.8625,36.4746],
'陽泉': [113.4778,38.0951],
'青島': [120.4651,36.3373],
'韶關': [113.7964,24.7028]
};
var XAData = [
[{name:'西安'}, {name:'北京',value:100}],
[{name:'西安'}, {name:'上海',value:100}],
[{name:'西安'}, {name:'廣州',value:100}],
[{name:'西安'}, {name:'西寧',value:100}],
[{name:'西安'}, {name:'銀川',value:100}]
];
var XNData = [
[{name:'西寧'}, {name:'北京',value:100}],
[{name:'西寧'}, {name:'上海',value:100}],
[{name:'西寧'}, {name:'廣州',value:100}],
[{name:'西寧'}, {name:'西安',value:100}],
[{name:'西寧'}, {name:'銀川',value:100}]
];
var YCData = [
[{name:'銀川'}, {name:'北京',value:100}],
[{name:'銀川'}, {name:'廣州',value:100}],
[{name:'銀川'}, {name:'上海',value:100}],
[{name:'銀川'}, {name:'西安',value:100}],
[{name:'銀川'}, {name:'西寧',value:100}],
];
var planePath = 'path://M1705.06,1318.313v-89.254l-319.9-221.799l0.073-208.063c0.521-84.662-26.629-121.796-63.961-121.491c-37.332-0.305-64.482,36.829-63.961,121.491l0.073,208.063l-319.9,221.799v89.254l330.343-157.288l12.238,241.308l-134.449,92.931l0.531,42.034l175.125-42.917l175.125,42.917l0.531-42.034l-134.449-92.931l12.238-241.308L1705.06,1318.313z';
//var planePath = 'arrow';
var convertData = function (data) {
var res = [];
for (var i = 0; i < data.length; i++) {
var dataItem = data[i];
var fromCoord = geoCoordMap[dataItem[0].name];
var toCoord = geoCoordMap[dataItem[1].name];
if (fromCoord && toCoord) {
res.push({
fromName: dataItem[0].name,
toName: dataItem[1].name,
coords: [fromCoord, toCoord],
value: dataItem[1].value
});
}
}
return res;
};
var color = ['#a6c84c', '#ffa022', '#46bee9'];//航線的顏色
var series = [];
[['西安', XAData], ['西寧', XNData], ['銀川', YCData]].forEach(function (item, i) {
series.push({
name: item[0] + ' Top3',
type: 'lines',
zlevel: 1,
effect: {
show: true,
period: 6,
trailLength: 0.7,
color: 'red', //arrow箭頭的顏色
symbolSize: 3
},
lineStyle: {
normal: {
color: color[i],
width: 0,
curveness: 0.2
}
},
data: convertData(item[1])
},
{
name: item[0] + ' Top3',
type: 'lines',
zlevel: 2,
symbol: ['none', 'arrow'],
symbolSize: 10,
effect: {
show: true,
period: 6,
trailLength: 0,
symbol: planePath,
symbolSize: 15
},
lineStyle: {
normal: {
color: color[i],
width: 1,
opacity: 0.6,
curveness: 0.2
}
},
data: convertData(item[1])
},
{
name: item[0] + ' Top3',
type: 'effectScatter',
coordinateSystem: 'geo',
zlevel: 2,
rippleEffect: {
brushType: 'stroke'
},
label: {
normal: {
show: true,
position: 'right',
formatter: '{b}'
}
},
symbolSize: function (val) {
return val[2] / 8;
},
itemStyle: {
normal: {
color: color[i],
},
emphasis: {
areaColor: '#2B91B7'
}
},
data: item[1].map(function (dataItem) {
return {
name: dataItem[1].name,
value: geoCoordMap[dataItem[1].name].concat([dataItem[1].value])
};
})
});
});
var option = {
backgroundColor: '#000',
title : {
text: '模擬航線',
subtext: '資料純屬虛構',
left: 'center',
textStyle : {
color: '#fff'
}
},
tooltip : {
trigger: 'item',
formatter:function(params, ticket, callback){
if(params.seriesType=="effectScatter") {
return "線路："+params.data.name+""+params.data.value[2];
}else if(params.seriesType=="lines"){
return params.data.fromName+">"+params.data.toName+"<br />"+params.data.value;
}else{
return params.name;
}
}
},
legend: {
orient: 'vertical',
top: 'bottom',
left: 'right',
data:['西安 Top3', '西寧 Top3', '銀川 Top3'],
textStyle: {
color: '#fff'
},
selectedMode: 'multiple'
},
geo: {
map: 'china',
label: {
emphasis: {
show: true,
color:'#fff'
}
},
roam: true,
itemStyle: {
normal: {
areaColor: '#00186E',
borderColor: '#195BB9',
borderWidth: 1,
},
emphasis: {
areaColor: '#2B91B7'
}
}
},
series: series
};
//3.把配置項和資料給例項物件
// myChart.setOption(option);
})();
出現的現象，index.js中的第3步總是報錯：
Uncaught DOMException: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The image argument is a canvas element with a width or height of 0，
具體的原因：
報錯大概是在繪製圖形時畫布大小為0，檢查之後發現該圖給了寬高，而且遷徙圖也是被繪製出來的，然後我試了下把寫在css樣式檔案中的寬高設定給在了行內，這樣就好了
也就是把將要放置地圖的div 設定一個高度和寬度即可！
參考連結：https://blog.csdn.net/deciduous_leaves/article/details/106762983