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<template>
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<view style="background: #FFFFFF;">
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<canvas v-if="!tempFilePath" :canvas-id="CanvasID" :style="{ width: canvasW + 'px', height: canvasH + 'px' }"></canvas>
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<image v-else lazy-load :src="tempFilePath" mode="widthFix" class="is-response" @longpress="toSave(tempFilePath)"></image>
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</view>
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</template>
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<script>
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var _this;
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export default {
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name: 'wm-poster',
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props: {
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CanvasID: { //CanvasID 等同于 canvas-id
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Type: String,
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default: 'PosterCanvas'
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},
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imgSrc: { //展示图
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Type: String,
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default: ''
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},
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QrSrc: { //二维码
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Type: String,
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default: ''
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},
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Title: { //文本内容
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Type: String,
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default: '惠聚'
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},
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TitleColor: { //标题颜色
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Type: String,
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default: '#000000'
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},
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LineType: { //标题显示行数 （注超出2行显示会导致画布布局絮乱）
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Type: [String, Boolean],
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default: true
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},
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PriceTxt: { //价格值
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Type: String,
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default: '99.99'
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},
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PriceColor: { //价格颜色
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Type: String,
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default: '#e31d1a'
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},
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OriginalTxt: { //原价值
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Type: String,
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default: '199.99'
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},
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OriginalColor: { //默认颜色（如原价与扫描二维码颜色）
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Type: String,
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default: '#b8b8b8'
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},
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Width: { //画布宽度 (高度根据图片比例计算 单位upx)
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Type: String,
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default: 700
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},
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CanvasBg: { //canvas画布背景色
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Type: String,
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default: '#ffffff'
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},
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Referrer: { //推荐人信息
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Type: String,
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default: '省钱兄霸王餐精选好物'
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},
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ViewDetails: { //描述提示文字
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Type: String,
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default: '长按或扫描二维码免费领取'
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}
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},
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data() {
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return {
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tempFilePath: '',
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canvasW: 0,
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canvasH: 0,
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canvasImgSrc: '',
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ctx: null
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};
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},
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methods: {
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toSave(url) {
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//#ifndef H5
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uni.getImageInfo({
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src: url,
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success: function(image) {
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console.log('图片信息：', JSON.stringify(image));
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uni.saveImageToPhotosAlbum({
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filePath: image.path,
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success: function() {
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console.log('save success');
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uni.showToast({
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title: '海报已保存相册',
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icon: 'success',
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duration: 2000
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});
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}
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});
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}
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});
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//#endif
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},
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async OnCanvas() {
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this.$queue.showLoading('海报生成中...');
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_this.ctx = uni.createCanvasContext(_this.CanvasID, this);
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const C_W = uni.upx2px(_this.Width), //canvas宽度
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C_P = uni.upx2px(30), //canvas Paddng 间距
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C_Q = uni.upx2px(150); //二维码或太阳码宽高
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let _strlineW = 0; //文本宽度
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let _imgInfo = await _this.getImageInfo({
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imgSrc: _this.imgSrc
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}); //广告图
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let _QrCode = await _this.getImageInfo({
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imgSrc: _this.QrSrc
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}); //二维码或太阳码
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let r = [_imgInfo.width, _imgInfo.height];
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let q = [_QrCode.width, _QrCode.height];
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let imgW = C_W - C_P * 2;
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if (r[0] != imgW) {
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r[1] = Math.floor((imgW / r[0]) * r[1]);
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r[0] = imgW;
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}
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if (q[0] != C_Q) {
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q[1] = Math.floor((C_Q / q[0]) * q[1]);
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q[0] = C_Q;
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}
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_this.canvasW = C_W;
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_this.canvasH = r[1] + q[1] + 128;
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_this.ctx.setFillStyle(_this.CanvasBg); //canvas背景颜色
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_this.ctx.fillRect(0, 0, C_W, _this.canvasH); //canvas画布大小
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//添加图片展示
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_this.ctx.drawImage(_imgInfo.path, C_P, C_P, r[0], r[1]);
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//添加图片展示 end
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//设置文本
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//#ifdef H5
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_this.ctx.setFontSize(uni.upx2px(32)); //设置标题字体大小
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//#endif
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//#ifndef H5
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_this.ctx.setFontSize(uni.upx2px(36)); //设置标题字体大小
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//#endif
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_this.ctx.setFillStyle(_this.TitleColor); //设置标题文本颜色
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let _strLastIndex = 0; //每次开始截取的字符串的索引
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let _strHeight = r[1] + C_P * 2 + 10; //绘制字体距离canvas顶部的初始高度
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let _num = 1;
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for (let i = 0; i < _this.Title.length; i++) {
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_strlineW += _this.ctx.measureText(_this.Title[i]).width;
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if (_strlineW > r[0]) {
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if (_num == 2 && _this.LineType) {
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//文字换行数量大于二进行省略号处理
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_this.ctx.fillText(_this.Title.substring(_strLastIndex, i - 8) + '...', C_P, _strHeight);
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_strlineW = 0;
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_strLastIndex = i;
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_num++;
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break;
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} else {
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_this.ctx.fillText(_this.Title.substring(_strLastIndex, i), C_P, _strHeight);
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_strlineW = 0;
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_strHeight += 20;
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_strLastIndex = i;
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_num++;
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}
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} else if (i == _this.Title.length - 1) {
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_this.ctx.fillText(_this.Title.substring(_strLastIndex, i + 1), C_P, _strHeight);
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_strlineW = 0;
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}
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}
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//设置文本 end
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//设置价格
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_strlineW = C_P;
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_strHeight += uni.upx2px(60);
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if (_num == 1) {
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_strHeight += 20; //单行标题时占位符
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}
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if (_this.PriceTxt != '') { //判断是否有销售价格
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_this.ctx.setFillStyle(_this.PriceColor);
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_this.ctx.setFontSize(uni.upx2px(38));
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_this.ctx.fillText(_this.PriceTxt, _strlineW, _strHeight); //商品价格
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_strlineW += _this.ctx.measureText(_this.PriceTxt).width + uni.upx2px(10);
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}
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if (_this.PriceTxt != '' && _this.OriginalTxt != '') { //判断是否有销售价格且原价
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_this.ctx.setFillStyle(_this.OriginalColor);
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_this.ctx.setFontSize(uni.upx2px(24));
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_this.ctx.fillText(_this.OriginalTxt, _strlineW, _strHeight); //商品原价
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}
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_this.ctx.strokeStyle = _this.OriginalColor;
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_this.ctx.moveTo(_strlineW, _strHeight - uni.upx2px(10)); //起点
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_this.ctx.lineTo(_strlineW + _this.ctx.measureText(_this.OriginalTxt).width, _strHeight - uni.upx2px(10)); //终点
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_this.ctx.stroke();
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//设置价格 end
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//添加二维码
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_strHeight += uni.upx2px(20);
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_this.ctx.drawImage(_QrCode.path, r[0] - q[0] + C_P, _strHeight, q[0], q[1]);
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//添加二维码 end
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//添加推荐人与描述
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_this.ctx.setFillStyle(_this.TitleColor);
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_this.ctx.setFontSize(uni.upx2px(30));
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_this.ctx.fillText(_this.Referrer, C_P, _strHeight + q[1] / 2);
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_this.ctx.setFillStyle(_this.OriginalColor);
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_this.ctx.setFontSize(uni.upx2px(24));
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_this.ctx.fillText(_this.ViewDetails, C_P, _strHeight + q[1] / 2 + 20);
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//添加推荐人与描述 end
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//延迟后渲染至canvas上
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setTimeout(function() {
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_this.ctx.draw(true, (ret) => {
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_this.getNewImage();
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});
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}, 600);
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// setTimeout(function () {
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// uni.hideLoading();
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// }, 3000);
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},
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async getImageInfo({
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imgSrc
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}) {
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return new Promise((resolve, errs) => {
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uni.getImageInfo({
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src: imgSrc,
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success: function(image) {
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resolve(image);
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},
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fail(err) {
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errs(err);
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uni.hideLoading();
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_this.$queue.showToast("海报生成失败")
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}
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});
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});
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},
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getNewImage() {
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uni.canvasToTempFilePath({
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canvasId: _this.CanvasID,
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quality: 1,
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complete: (res) => {
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_this.tempFilePath = res.tempFilePath;
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_this.$emit('success', res);
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_this.$queue.showToast("长按图片保存海报")
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// uni.hideLoading();
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}
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}, this);
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}
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},
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mounted() {
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_this = this;
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this.OnCanvas();
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}
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};
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</script>
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<style></style>
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