小程序头像制作
hackun 人气:10马上就到春节了,今天看到有网友分享了网页版的虎年头像制作工具,感觉很不错,正好打算做个小程序练手没啥主题,那就用这个试试吧。
先上最终效果图:
说下实现流程
第一步:先获取到当前微信的头像图片,主要代码如下,注意默认获取到的头像图片不是高清的,需要先转换成高清图片,避免生成之后很模糊。
getUserProfile(e) { console.log(e) let that = this; wx.getUserProfile({ desc: '仅用于生成头像使用', success: (res) => { var url = res.userInfo.avatarUrl; while (!isNaN(parseInt(url.substring(url.length - 1, url.length)))) { url = url.substring(0, url.length - 1) } url = url.substring(0, url.length - 1) + "/0"; res.userInfo.avatarUrl = url; console.log(JSON.stringify(res.userInfo)); that.setData({ userInfo: res.userInfo, hasUserInfo: true }) that.drawImg(); } }); },
第二步:合成头像,把素材图片和第一步获取到的头像图片,获取到本地文件,然后利用小程序的cavas组件进行合成。
drawImg() { let that = this; wx.showLoading({ title: '生成头像中...', }) let promise1 = new Promise(function (resolve, reject) { wx.getImageInfo({ src: that.data.userInfo.avatarUrl, success: function (res) { resolve(res); } }) }); var mask_id = that.data.now_mask; let promise2 = new Promise(function (resolve, reject) { wx.getImageInfo({ src: `../../assets/img/mask0${mask_id}.png`, success: function (res) { console.log(res) resolve(res); } }) }); Promise.all([ promise1, promise2 ]).then(res => { console.log(res) var windowWidth = wx.getSystemInfoSync().windowWidth var context = wx.createCanvasContext('myAvatar'); var size = windowWidth /750 * 500 // var size = 500 context.drawImage(res[0].path, 0, 0, size, size); context.draw(true) context.save(); context.drawImage('../../'+res[1].path, 0, 0, size, size); context.draw(true) context.save(); }) wx.hideLoading() },
第三步:下载合成的图片到本地相册。
canvasToTempFile(){ if(!this.data.userInfo){ wx.showModal({ title: '温馨提示', content: '请先点击上方获取微信头像', showCancel: false, }) return } var windowWidth = wx.getSystemInfoSync().windowWidth var size = 500 // var dpr = 750 / windowWidth wx.canvasToTempFilePath({ x: 0, y: 0, height: size, width: size, canvasId: 'myAvatar', success: (res) => { wx.saveImageToPhotosAlbum({ filePath: res.tempFilePath, success: result => { wx.hideLoading(); wx.showModal({ content: '图片已保存到相册,请前往微信去设置哟!', showCancel: false, success: function(res) { if (res.confirm) { console.log('用户点击确定'); } } }) }, fail(e) { wx.hideLoading(); console.log("err:" + e); } }) } }); },
这样就实现了主要的功能了。
最后放上小程序码,欢迎大家扫码体验一下:
最后 当前项目已开源:hackun666/new-year-face: wechat new year face maker (github.com)
祝大家春节快乐,虎年大吉!
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