200 lines
7.6 KiB
Vue
200 lines
7.6 KiB
Vue
<template>
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<view class="content" v-if="isShow" @click.stop="isShow=false">
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<canvas @click.stop="" :style="{ width: canvasW + 'px', height: canvasH + 'px' }" canvas-id="my-canvas"></canvas>
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<view class="save-btn" @click.stop="saveImage">保存海报</view>
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</view>
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</template>
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<script>
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export default{
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props:{
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headerImg:{
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type: String,
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default: 'https://zhaixiandaojia.com/public/uploads/20210123/f87969714ba1d865f2366b997cbd9fd8.jpg'
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},
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title:{
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type: String,
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default: '盛安小象'
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},
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subTitle:{
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type: String,
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default: '盛安小象'
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},
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content:{
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type: String,
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default: "推荐码"
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},
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abImg:{
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type: String,
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default: 'https://zhaixiandaojia.com/public/uploads/20210123/f87969714ba1d865f2366b997cbd9fd8.jpg'
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}
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},
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data(){
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return {
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canvasW: 0,
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canvasH: 0,
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ctx: null,
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isShow: false,
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qrcode: ''
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}
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},
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methods:{
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//显示
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showCanvas(headerImg, qrcode){
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this.isShow = true
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this.qrcode = qrcode
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this.headerImg = headerImg
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this.__init()
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},
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//初始化画布
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async __init(){
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uni.showLoading({
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title: '加载中...',
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mask: true
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})
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this.ctx = uni.createCanvasContext('my-canvas',this)
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this.canvasW = uni.upx2px(550);
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this.canvasH = uni.upx2px(900);
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//设置画布背景透明
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this.ctx.setFillStyle('rgba(255, 255, 255, 0)')
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//设置画布大小
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this.ctx.fillRect(0,0,this.canvasW,this.canvasH)
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//绘制圆角背景
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this.drawRoundRect(this.ctx, 0, 0, this.canvasW, this.canvasH,uni.upx2px(18),'#FFFFFF')
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//获取标题图片
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let headerImg = await this.getImageInfo(this.headerImg)
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let hW = uni.upx2px(500);
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let hH = uni.upx2px(700);
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//绘制标题图
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this.drawRoundImg(this.ctx,headerImg.path,((this.canvasW-hW) / 2),((this.canvasW-hW) / 2),hW,hH,uni.upx2px(16))
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//绘制标题
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this.ctx.setFontSize(14); //设置标题字体大小
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this.ctx.setFillStyle('#333'); //设置标题文本颜色
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this.ctx.fillText(this.title,((this.canvasW-hW) / 2)+uni.upx2px(120),(((this.canvasW-hW) / 2) + hH + uni.upx2px(80)))
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//绘制内容
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if(this.content){
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//console.log(this.content)
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this.ctx.setFontSize(14);
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this.ctx.setFillStyle('#999');
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/* this.ctx.fillText('￥',((this.canvasW-hW) / 2),(((this.canvasW-hW) / 2) + hH + uni.upx2px(120))) */
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this.ctx.setFontSize(12);
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this.ctx.fillText("邀请码:"+this.content,(((this.canvasW-hW) / 2) + uni.upx2px(120)),(((this.canvasW-hW) / 2) + hH + uni.upx2px(130)))
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}
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//绘制头像
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let BottomAdImg = await this.getImageInfo(this.abImg)
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this.ctx.drawImage(BottomAdImg.path, 16, (((this.canvasW-hW) / 2) + hH + uni.upx2px(40)), 50, 50)
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//延迟渲染
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setTimeout(()=>{
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this.ctx.draw(true,()=>{
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uni.hideLoading()
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})
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},500)
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},
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//带圆角图片
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drawRoundImg(ctx, img, x, y, width, height, radius){
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ctx.beginPath()
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ctx.save()
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// 左上角
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ctx.arc(x + radius, y + radius, radius, Math.PI, Math.PI * 1.5)
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// 右上角
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ctx.arc(x + width - radius, y + radius, radius, Math.PI * 1.5, Math.PI * 2)
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// 右下角
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ctx.arc(x + width - radius, y + height - radius, radius, 0, Math.PI * 0.5)
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// 左下角
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ctx.arc(x + radius, y + height - radius, radius, Math.PI * 0.5, Math.PI)
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ctx.stroke()
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ctx.clip()
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ctx.drawImage(img, x, y, width, height);
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ctx.restore()
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ctx.closePath()
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},
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//圆角矩形
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drawRoundRect(ctx, x, y, width, height, radius, color){
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ctx.save();
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ctx.beginPath();
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ctx.setFillStyle(color);
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ctx.setStrokeStyle(color)
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ctx.setLineJoin('round'); //交点设置成圆角
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ctx.setLineWidth(radius);
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ctx.strokeRect(x + radius/2, y + radius/2, width - radius , height - radius );
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ctx.fillRect(x + radius, y + radius, width - radius * 2, height - radius * 2);
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ctx.stroke();
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ctx.closePath();
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},
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//获取图片
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getImageInfo(imgSrc){
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return new Promise((resolve, reject) => {
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console.log("图片链接",imgSrc)
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console.log("图片类型",typeof imgSrc)
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uni.getImageInfo({
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src: imgSrc,
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success: (image) => {
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resolve(image);
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console.log('获取图片成功',image)
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},
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fail: (err) => {
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reject(err);
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console.log('获取图片失败',err)
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uni.hideLoading()
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uni.showToast({
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title: '获取图片失败'
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});
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}
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});
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});
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},
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//保存图片到相册
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saveImage(){
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var that = this
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uni.showLoading({
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title: '正在加载',
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mask: false
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});
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uni.canvasToTempFilePath({
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canvasId: 'my-canvas',
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quality: 1,
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complete: (res) => {
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console.log('保存到相册',res);
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uni.saveImageToPhotosAlbum({
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filePath: res.tempFilePath,
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success(res) {
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uni.hideLoading();
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uni.showToast({
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title: '已保存到相册',
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icon: 'success',
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duration: 2000
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})
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setTimeout(()=>{
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that.isShow = false
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},2000)
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}
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})
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}
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},this);
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}
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}
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}
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</script>
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<style scoped lang="scss">
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.content{
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position: fixed;
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top: 0;
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left: 0;
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right: 0;
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bottom: 0;
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z-index: 9999999;
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background: rgba(0,0,0,.4);
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display: flex;
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flex-direction: column;
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justify-content: center;
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align-items: center;
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.save-btn{
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margin-top: 35rpx;
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color: #FFFFFF;
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background-image: linear-gradient(-45deg, #17bd6e, #019c88);
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padding: 15rpx 40rpx;
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border-radius: 50rpx;
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}
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}
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</style> |