wxml文件
<!-- 拍照上传图片带水印 --> <camera device-position="front" flash="off" @error="error" style="width: 100%; height: 300px;"></camera> <button type="primary" @tap="takePhoto">拍照</button> <view>预览</view> <image mode="widthFix" :src="src"></image> <canvas class='canvas' :style="canvasStyle" canvas-id="firstCanvas"></canvas>js文件数据区:
data() { return { socketOpen: false, src:'', canvasStyle:{} } }js文件方法区:
takePhoto() { const ctx = uni.createCameraContext() ctx.takePhoto({ quality: 'high', success: (res) => { this.src=res.tempImagePath; let that = this; uni.getImageInfo({ src: res.tempImagePath, success: (ress) => { let date = "水印内容"; /** 作为水印 */ let ctx = uni.createCanvasContext('firstCanvas'); /** 创建画布 */ let textToWidth = ress.width / 3 * 0.5; /**这里设置的是水印位置*/ let textToHeight = ress.height / 3 * 0.9; that.canvasStyle=`{width:${ress}.width/3px;height:${ress}.height/3px}`; //将图片src放到cancas内,宽高为图片大小 ctx.drawImage(res.tempImagePath, 0, 0, ress.width / 3, ress.height / 3) //将声明的时间放入canvas ctx.setFontSize(14) //注意:设置文字大小必须放在填充文字之前,否则不生效 ctx.setFillStyle('blue') ctx.fillText(date, textToWidth, textToHeight) //水印内容,位置 // ctx.strokeText(date, ress.width, ress.height) uni.showLoading({ title: '制作水印中...', }) ctx.draw(false, () => {//开始制作 setTimeout(() => {//使用定时是因为制作水印需要时间,设置定时才不会出bug uni.canvasToTempFilePath({//将画布中内容转成图片,即水印与图片合成 canvasId: 'firstCanvas', success: (res) => { uni.hideLoading() uni.saveImageToPhotosAlbum({//保存到手机 filePath: res.tempFilePath, success(res) { console.log('1') } }) } }) }, 500) }) } }) } }) }上面的代码没有上传功能,而且图片的裁剪比较麻烦,下面是进行了修改后使用到了项目中的代码:
<view class="add-img"> <view class="label">添加图片</view> <view class="imgs flex flex-middle"> <image :src="item" v-for="(item,index) in fileList" :key="index"></image> <image src="../../static/img/uploadimg.png" @click="chooseImg"></image> </view> </view> <!--因为要用到canvas,而项目中不能显示canvas,所以对它进行了隐藏--> <view style="width: 0; height: 0; overflow: hidden; visibility: hidden;"> <canvas class='canvas' :style="{'width': canvasWdith+'px', 'height': canvasHeight+'px'}" canvas-id="firstCanvas"></canvas> </view>
<script> export default { components: { }, data() { return { fileList:[], canvasWdith:0, canvasHeight:0 }; }, onLoad(options) { }, methods: { chooseImg(){ var that = this; uni.chooseImage({ count: 1, sizeType: ['compressed'], sourceType: ['album','camera'], success: function (res) { uni.getImageInfo({ src: res.tempFilePaths[0], success: (ress) => { let ctx = uni.createCanvasContext('firstCanvas'); let date = "水印内容水印内容水印内容水印内"; let textWidth = ctx.measureText(date).width; let imgWidth = ress.width/4; let imgHeight = ress.height/4; that.canvasWdith=imgWidth; that.canvasHeight=imgHeight; that.$nextTick(() => { //将图片src放到cancas内,宽高为图片大小 ctx.drawImage(res.tempFilePaths[0], 0, 0, imgWidth, imgHeight); //将声明的时间放入canvas ctx.setFontSize(14) //注意:设置文字大小必须放在填充文字之前,否则不生效 ctx.setFillStyle('white') ctx.fillText(date, 0, imgHeight-20) //水印内容,位置 // ctx.strokeText(date, ress.width, ress.height) uni.showLoading({ title: '制作水印中...', }) ctx.draw(false, () => {//开始制作 setTimeout(() => {//使用定时是因为制作水印需要时间,设置定时才不会出bug uni.canvasToTempFilePath({//将画布中内容转成图片,即水印与图片合成 canvasId: 'firstCanvas', success: (res) => { uni.hideLoading(); uni.showToast({ duration: 1000, title: '上传中...', icon: 'loading' }) uni.uploadFile({ url: 'http://www.5imoban.net/upload', filePath: res.tempFilePath, name: 'file', success: (res) => { that.fileList.push(r.data); uni.hideToast() }, fail: function(xhr, type) { console.log(JSON.stringify(xhr)); func.msg('上传失败!'); uni.hideToast() } }) } }) }, 500) }) }) } }) } }); }, }, } </script>
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