uniapp上echarts地图钻取
1: 预期效果
通过切换地图 , 实现地图的钻取效果
2: 实现原理以及核心方法/参数
一开始是想利用更换地图数据的形式进行地图钻取 , 这就意味着我们需要准备全国30多个省份的地图数据 , 由于一开始考虑需要适配小程序端 , 如此多的地图文件增加了程序的体积 , 如果使用接口调用 , 会影响响应速度 ; 所以最后想到了使用一张地图数据 , 通过地图中心点定位 + 缩放 + 主动触发高亮
方法解读: **
监听到地图点击事件/地图切换事件 ,
通过center属性定位当前省份 , 通过zoom属性指定放大层级(让当前省份占据页面) ,
接下来需要将其他的省份隐藏掉 , 这里通过itemStyle样式设置 , 将地图的透明度调整为0 ,
这时候发现我们选择的当前省份也隐藏掉了 , 这时候就要借助另一个属性 emphasis ,
在emphasis 中可以将当前选中的地图区块重新定义样式 ;
如果我们是通过地图点击触发的钻取 , 当前省份区块是可以被选中的 , 但是如果是select选择器 , 需要调用echarts的dispatchAction**接口进行主动触发
_this.$refs['canvas'].$curChart.dispatchAction({
type: 'highlight',
name: _this.cityList[e.target.value]['name']
})
参数如下:
geo: {
map: "china", // 映射的地图name
// roam: 'scale', // scale缩放/ move拖动 / true 缩放+拖动
center: '', // 中心点位置坐标
scaleLimit: {
min: 1,
max: 10
}, // 缩放比例限制
zoom: 1.2, // 当前缩放比例
top: 50,
label: { // 地图文本样式
show: true,
fontSize: "8",
color: "rgba(0,0,0,0.7)"
},
itemStyle: { // 地图区块样式
borderColor: "rgba(0, 0, 0, 0.2)",
opacity: 1
},
emphasis: { // 当前选中地图区块样式
itemStyle: {
opacity: 1,
areaColor: "#f2d5ad",
shadowOffsetX: 0,
shadowOffsetY: 0,
borderWidth: 2
}
},
selectedMode: false , // 多选开关
silent: false // 是否静默状态
},
3: 代码
demo.vue
<template>
<view>
<view style="height:34px;"></view>
<!-- <uchartsDemo1></uchartsDemo1> -->
<view class="uni-title uni-common-pl">地区选择器</view>
<view class="uni-list">
<view class="uni-list-cell">
<view class="uni-list-cell-left">
当前选择
</view>
<view class="uni-list-cell-db">
<picker @change="bindPickerChange" :value="index" :range="cityList" :range-key="'name'">
<view class="uni-input">{{cityList[index]['name']}}</view>
</picker>
</view>
</view>
</view>
<uni-ec-canvas class="uni-ec-canvas" id="line-chart" ref="canvas" canvas-id="lazy-load-chart" :ec="ec"></uni-ec-canvas>
</view>
</template>
<script>
import uniEcCanvas from '@/components/uni-ec-canvas/uni-ec-canvas'
import cityMap from './cityMap.js'
import chartsOption from './chartsOption.js'
let pageInstance = {}
export default {
data() {
return {
index: 0,
cityList: [{name:'全国'},...cityMap.cityPointList],
ec: {
lazyLoad: true,
option: chartsOption.mapOption
}
}
},
mounted() {
this.$refs['canvas'].init()
},
components: {
uniEcCanvas
},
methods:{
// 城市切换
bindPickerChange (e) {
const _this = this
// 根据name获取当前城市数据 , 并修改option
// 获取城市坐标
let point = cityMap.cityPointMap.get(_this.cityList[e.target.value]['name']) || []
let data = cityMap.cityDataMap.get(_this.cityList[e.target.value]['name']) || {}
// 组装option
let mapOption = JSON.parse(JSON.stringify(chartsOption.mapOption))
mapOption.geo.center = point
mapOption.geo.zoom = 6
mapOption.geo.silent = true
mapOption.geo.label.show = false
mapOption.geo.itemStyle.opacity = 0
mapOption.series[0].data = [data]
_this.ec.option = mapOption
setTimeout(function(){
_this.$refs['canvas'].$curChart.dispatchAction({
type: 'highlight',
name: _this.cityList[e.target.value]['name']
})
},10)
},
BindEvent (e) {
}
}
}
</script>
<style scoped>
.uni-ec-canvas {
width: 750upx;
height: 750upx;
display: block;
}
</style>
cityMap.js – 存放所有省份的中心点 , 数据 , 自定义的配置
let cityMap = {}
cityMap.cityPointList = [
{
"cp": [121.0254, 23.5986],
"name": "台湾",
"childNum": 6
},
{
"cp": [115.4004, 37.9688],
"name": "河北",
"childNum": 3
},
{
"cp": [112.4121, 37.6611],
"name": "山西",
"childNum": 1
},
{
"cp": [117.5977, 44.3408],
"name": "内蒙古",
"childNum": 2
},
{
"cp": [122.3438, 41.0889],
"name": "辽宁",
"childNum": 16
},
{
"cp": [126.4746, 43.5938],
"name": "吉林",
"childNum": 1
},
{
"cp": [128.1445, 48.5156],
"name": "黑龙江",
"childNum": 2
},
{
"cp": [120.0586, 32.915],
"name": "江苏",
"childNum": 1
},
{
"cp": [120.498, 29.0918],
"name": "浙江",
"childNum": 45
},
{
"cp": [117.2461, 32.0361],
"name": "安徽",
"childNum": 3
},
{
"cp": [118.3008, 25.9277],
"name": "福建",
"childNum": 18
},
{
"cp": [116.0156, 27.29],
"name": "江西",
"childNum": 1
},
{
"cp": [118.7402, 36.4307],
"name": "山东",
"childNum": 13
},
{
"cp": [113.4668, 33.8818],
"name": "河南",
"childNum": 1
},
{
"cp": [112.2363, 31.1572],
"name": "湖北",
"childNum": 3
},
{
"cp": [111.5332, 27.3779],
"name": "湖南",
"childNum": 3
},
{
"cp": [113.4668, 22.8076],
"name": "广东",
"childNum": 24
},
{
"cp": [108.2813, 23.6426],
"name": "广西",
"childNum": 2
},
{
"cp": [109.9512, 19.2041],
"name": "海南",
"childNum": 1
},
{
"cp": [102.9199, 30.1904],
"name": "四川",
"childNum": 2
},
{
"cp": [106.6113, 26.9385],
"name": "贵州",
"childNum": 3
},
{
"cp": [101.8652, 25.1807],
"name": "云南",
"childNum": 1
},
{
"cp": [88.7695, 31.6846],
"name": "西藏",
"childNum": 1
},
{
"cp": [109.5996, 35.6396],
"name": "陕西",
"childNum": 1
},
{
"cp": [95.7129, 40.166],
"name": "甘肃",
"childNum": 2
},
{
"cp": [96.2402, 35.4199],
"name": "青海",
"childNum": 2
},
{
"cp": [105.9961, 37.3096],
"name": "宁夏",
"childNum": 2
},
{
"cp": [84.9023, 41.748],
"name": "新疆",
"childNum": 1
},
{
"cp": [116.4551, 40.2539],
"name": "北京",
"childNum": 1
},
{
"cp": [117.4219, 39.4189],
"name": "天津",
"childNum": 1
},
{
"cp": [121.4648, 31.2891],
"name": "上海",
"childNum": 6
},
{
"cp": [107.7539, 30.1904],
"name": "重庆",
"childNum": 2
},
{
"cp": [115.5784, 22.1057],
"name": "香港",
"childNum": 5
},
{
"cp": [113.5715, 21.1983],
"name": "澳门",
"childNum": 1
}
]
cityMap.cityDataList = [{
name: "南海诸岛",
value: 0
},
{
name: '北京',
value: 54
},
{
name: '天津',
value: 13
},
{
name: '上海',
value: 40
},
{
name: '重庆',
value: 75
},
{
name: '河北',
value: 13
},
{
name: '河南',
value: 83
},
{
name: '云南',
value: 11
},
{
name: '辽宁',
value: 19
},
{
name: '黑龙江',
value: 15
},
{
name: '湖南',
value: 69
},
{
name: '安徽',
value: 60
},
{
name: '山东',
value: 39
},
{
name: '新疆',
value: 4
},
{
name: '江苏',
value: 31
},
{
name: '浙江',
value: 104
},
{
name: '江西',
value: 36
},
{
name: '湖北',
value: 1052
},
{
name: '广西',
value: 33
},
{
name: '甘肃',
value: 7
},
{
name: '山西',
value: 9
},
{
name: '内蒙古',
value: 7
},
{
name: '陕西',
value: 22
},
{
name: '吉林',
value: 4
},
{
name: '福建',
value: 18
},
{
name: '贵州',
value: 5
},
{
name: '广东',
value: 98
},
{
name: '青海',
value: 1
},
{
name: '西藏',
value: 0
},
{
name: '四川',
value: 44
},
{
name: '宁夏',
value: 4
},
{
name: '海南',
value: 22
},
{
name: '台湾',
value: 3
},
{
name: '香港',
value: 5
},
{
name: '澳门',
value: 5
}
]
cityMap.cityPointMap = new Map()
cityMap.cityDataMap = new Map()
cityMap.cityPointList.forEach(e=>{
let {name,cp} = e
cityMap.cityPointMap.set(name,cp)
})
cityMap.cityDataList.forEach(e=>{
cityMap.cityDataMap.set(e.name,e)
})
export default cityMap
chartsOption.js – 存在地图option配置
let chartsOption = {}
// 地图
chartsOption.mapOption = {
visualMap: {
min: 0,
max: 1000,
right: 10,
bottom: 40,
showLabel: !0,
text: ["高", "低"],
pieces: [{
gt: 100,
label: "> 100",
color: "#7f1100"
}, {
gte: 10,
lte: 100,
label: "100",
color: "#ff5428"
}, {
gte: 1,
lt: 10,
label: "10",
color: "#ff8c71"
}, {
gt: 0,
lt: 1,
label: "1",
color: "#ffd768"
}, {
value: 0,
color: "#ffffff"
}],
show: !0
},
geo: {
map: "china",
// roam: 'scale', // scale缩放/ move拖动
center: '', // 中心点位置
scaleLimit: {
min: 1,
max: 10
}, // 缩放限制
zoom: 1.2, // 缩放比例
top: 50,
label: {
show: true,
fontSize: "8",
color: "rgba(0,0,0,0.7)"
},
itemStyle: {
borderColor: "rgba(0, 0, 0, 0.2)",
opacity: 1
},
emphasis: {
itemStyle: {
opacity: 1,
areaColor: "#f2d5ad",
shadowOffsetX: 0,
shadowOffsetY: 0,
borderWidth: 2
}
},
selectedMode: false ,
silent: false
},
series: [{
name: "汽车销量",
type: "map",
geoIndex: 0,
data: [{
name: "南海诸岛",
value: 0
},
{
name: '北京',
value: 54
},
{
name: '天津',
value: 13
},
{
name: '上海',
value: 40
},
{
name: '重庆',
value: 75
},
{
name: '河北',
value: 13
},
{
name: '河南',
value: 83
},
{
name: '云南',
value: 11
},
{
name: '辽宁',
value: 19
},
{
name: '黑龙江',
value: 15
},
{
name: '湖南',
value: 69
},
{
name: '安徽',
value: 60
},
{
name: '山东',
value: 39
},
{
name: '新疆',
value: 4
},
{
name: '江苏',
value: 31
},
{
name: '浙江',
value: 104
},
{
name: '江西',
value: 36
},
{
name: '湖北',
value: 1052
},
{
name: '广西',
value: 33
},
{
name: '甘肃',
value: 7
},
{
name: '山西',
value: 9
},
{
name: '内蒙古',
value: 7
},
{
name: '陕西',
value: 22
},
{
name: '吉林',
value: 4
},
{
name: '福建',
value: 18
},
{
name: '贵州',
value: 5
},
{
name: '广东',
value: 98
},
{
name: '青海',
value: 1
},
{
name: '西藏',
value: 0
},
{
name: '四川',
value: 44
},
{
name: '宁夏',
value: 4
},
{
name: '海南',
value: 22
},
{
name: '台湾',
value: 3
},
{
name: '香港',
value: 5
},
{
name: '澳门',
value: 5
}
]
}]
}
export default chartsOption