微信小程序开发之map地图实现教程
前言
微信小程序地图操作比较简单,api也很少,使用map组件来展示。说到地图,那就先来看基础定位:
定位用到wx.getLocation(OBJECT)
函数,代码如下:
wx.getLocation({ type: 'wgs84', success: function(res) { var latitude = res.latitude var longitude = res.longitude var speed = res.speed var accuracy = res.accuracy } })
定位成功会返回四个参数值,如下:
map属性太多,先看一下:
如果用到地图,基本上所有属性都会用到。
下面一一看一下,我们先看效果图吧,先看真相:
这里我只用了一个markers,就是定位当前位置的红色markers,用法如下:
wx.getLocation({ type: 'wgs84', // 默认为 wgs84 返回 gps 坐标,gcj02 返回可用于 wx.openLocation 的坐标 success: function (res) { _this.setData({ latitude: res.latitude, longitude: res.longitude, markers: [{ id: "1", latitude: res.latitude, longitude: res.longitude, width: 50, height: 50, iconPath: "/assests/imgs/my.png", title: "哪里" }], circles: [{ latitude: res.latitude, longitude: res.longitude, color: '#FF0000DD', fillColor: '#7cb5ec88', radius: 3000, strokeWidth: 1 }] }) } })
这里加了circles,半径是3000米,具体的api可自行看官网。
接下来看看controls,控制层,在地图上显示控件,控件不随着地图移动,看API:
注意看示例图的右上角,有两个按钮,加减号,是控制地图scale的数值变化,动态缩放地图的,controls用法也很简单:
controls: [{ id: 1, iconPath: '/assests/imgs/jian.png', position: { left: 320, top: 100 - 50, width: 20, height: 20 }, clickable: true }, { id: 2, iconPath: '/assests/imgs/jia.png', position: { left: 340, top: 100 - 50, width: 20, height: 20 }, clickable: true } ]
最后我们看一张gif图:
最后上一下具体代码:
wxml:
<map id="map" longitude="{{longitude}}" latitude="{{latitude}}" scale="{{scale}}" controls="{{controls}}" bindcontroltap="controltap" markers="{{markers}}" circles="{{circles}}" bindmarkertap="markertap" polyline="{{polyline}}" bindregionchange="regionchange" show-location style="width: 100%; height: {{view.Height}}px;"></map>
js:
Page({ data: { Height: 0, scale: 13, latitude: "", longitude: "", markers: [], controls: [{ id: 1, iconPath: '/assests/imgs/jian.png', position: { left: 320, top: 100 - 50, width: 20, height: 20 }, clickable: true }, { id: 2, iconPath: '/assests/imgs/jia.png', position: { left: 340, top: 100 - 50, width: 20, height: 20 }, clickable: true } ], circles: [] }, onLoad: function () { var _this = this; wx.getSystemInfo({ success: function (res) { //设置map高度,根据当前设备宽高满屏显示 _this.setData({ view: { Height: res.windowHeight } }) } }) wx.getLocation({ type: 'wgs84', // 默认为 wgs84 返回 gps 坐标,gcj02 返回可用于 wx.openLocation 的坐标 success: function (res) { _this.setData({ latitude: res.latitude, longitude: res.longitude, markers: [{ id: "1", latitude: res.latitude, longitude: res.longitude, width: 50, height: 50, iconPath: "/assests/imgs/my.png", title: "哪里" }], circles: [{ latitude: res.latitude, longitude: res.longitude, color: '#FF0000DD', fillColor: '#7cb5ec88', radius: 3000, strokeWidth: 1 }] }) } }) }, regionchange(e) { console.log("regionchange===" + e.type) }, //点击merkers markertap(e) { console.log(e.markerId) wx.showActionSheet({ itemList: ["A"], success: function (res) { console.log(res.tapIndex) }, fail: function (res) { console.log(res.errMsg) } }) }, //点击缩放按钮动态请求数据 controltap(e) { var that = this; console.log("scale===" + this.data.scale) if (e.controlId === 1) { // if (this.data.scale === 13) { that.setData({ scale: --this.data.scale }) // } } else { // if (this.data.scale !== 13) { that.setData({ scale: ++this.data.scale }) // } } }, })
总结
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