165 lines
4.4 KiB
Vue
165 lines
4.4 KiB
Vue
<template>
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<view class="container">
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<canvas canvas-id="myCanvas" style="width: 300px; height: 300px;"></canvas>
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<button @tap="uploadImage">上传印章图片</button>
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<button @tap="processImage" v-if="imagePath">处理图片</button>
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<image :src="processedImage" v-if="processedImage" mode="widthFix"></image>
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</view>
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</template>
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<script>
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import { BASE_URL,IMAGE_BASE_URL } from '@/utils/config';
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export default {
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data() {
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return {
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imagePath: '',
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processedImage: ''
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}
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},
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methods: {
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// 上传图片
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uploadImage() {
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const that = this;
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uni.chooseImage({
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count: 1,
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sourceType: ['album', 'camera'],
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success: function (res) {
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that.imagePath = res.tempFilePaths[0];
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that.drawImageToCanvas();
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}
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});
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},
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// 将图片绘制到Canvas
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drawImageToCanvas() {
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const that = this;
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const ctx = uni.createCanvasContext('myCanvas', this);
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// 清空Canvas
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ctx.clearRect(0, 0, 300, 300);
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// 绘制图片
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uni.getImageInfo({
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src: that.imagePath,
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success: function (res) {
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ctx.drawImage(res.path, 0, 0, 300, 300);
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ctx.draw(false, () => {
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console.log('图片绘制完成');
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});
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}
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});
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},
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// 处理图片（移除白色背景）
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processImage() {
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const that = this;
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const ctx = uni.createCanvasContext('myCanvas', this);
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// 获取Canvas像素数据
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uni.canvasGetImageData({
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canvasId: 'myCanvas',
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x: 0,
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y: 0,
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width: 300,
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height: 300,
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success: function(res) {
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const data = res.data;
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// 遍历像素数据，将白色（或接近白色）变为透明
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for (let i = 0; i < data.length; i += 4) {
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const r = data[i];
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const g = data[i + 1];
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const b = data[i + 2];
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// 判断是否为白色或接近白色（可根据需要调整阈值）
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if (r > 200 && g > 200 && b > 200) {
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data[i + 3] = 0; // 设置Alpha通道为0（完全透明）
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}
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}
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// 将处理后的像素数据放回Canvas
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uni.canvasPutImageData({
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canvasId: 'myCanvas',
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x: 0,
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y: 0,
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width: 300,
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height: 300,
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data: data,
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success: function() {
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// 将Canvas内容转换为图片
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that.canvasToImage();
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}
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});
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}
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});
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},
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// 将Canvas转换为图片
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canvasToImage() {
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const that = this;
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uni.canvasToTempFilePath({
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canvasId: 'myCanvas',
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success: function(res) {
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that.processedImage = res.tempFilePath;
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const fileList = [{
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url: res.tempFilePath,
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status: 'uploading'
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}];
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console.log("==fileList",fileList)
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// 4. 上传文件
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that.uploadFile(fileList[0]);
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// 这里可以调用上传接口，将处理后的图片上传到服务器
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console.log('处理后的图片路径:', res.tempFilePath);
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},
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fail: function(err) {
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console.error('Canvas转换失败', err);
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}
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});
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},
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async uploadFile(file) {
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try {
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await new Promise((resolve, reject) => {
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uni.uploadFile({
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url: `${IMAGE_BASE_URL}/api/v1/upload`,
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filePath: file.url,
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name: 'file',
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header: {
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'Authorization': `Bearer ${uni.getStorageSync('token')}`,
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'Content-Type': 'multipart/form-data'
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},
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success: (uploadRes) => {
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try {
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const data = JSON.parse(uploadRes.data);
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if (data.success) {
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resolve(data.data);
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} else {
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reject(data.message || '上传失败');
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}
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} catch (e) {
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reject('解析响应失败');
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}
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},
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fail: (err) => reject(err)
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});
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});
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} catch (err) {
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console.error('上传失败:', err);
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const index = this.fileList.findIndex(f => f.url === file.url);
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if (index !== -1) {
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this.$set(this.fileList, index, {
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...file,
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status: 'failed',
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error: err.message || err
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});
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}
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uni.showToast({
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title: `上传失败: ${err.message || err}`,
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icon: 'none'
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});
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throw err;
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}
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},
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}
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}
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</script> |