更新记录

2.0.4(2022-11-17)

兼容了字节跳动、支付宝小程序

2.0.3(2022-11-16)

修复微信小程序console报错的问题

2.0.2(2022-11-16)

修复ReadMe.md

查看更多

平台兼容性

Vue2 Vue3
App 快应用 微信小程序 支付宝小程序 百度小程序 字节小程序 QQ小程序
HBuilderX 3.6.0 app-vue × × ×
钉钉小程序 快手小程序 飞书小程序 京东小程序
× × × ×
H5-Safari Android Browser 微信浏览器(Android) QQ浏览器(Android) Chrome IE Edge Firefox PC-Safari
×

xinyu-canvas-drawer-uniapp

uniapp中使用canvas绘制图片的一款组件,可用于海报、分享图等各种图的绘制,多端通用,内聚了所有图片加载处理的过程。组件由原本的旧版Canvas改为现在的Canvas2D,兼容了微信小程序、APP、网页H5三端,修复了二维码的绘制问题!

引入教程:

在页面中引入组件并注册:

import XinyuCanvasDrawer from "@/uni_modules/xinyu-canvas-drawer/index.vue";
export default{
    components: {
        XinyuCanvasDrawer
    }
}

在页面中使用:

<xinyu-canvas-drawer ref="poster" :width="750" :height="750"></xinyu-canvas-drawer>
<image :src="src" style="width: 750rpx;height: 750rpx;"></image>

组件介绍

其中width为待绘制的图片目标宽度,height为目标高度,单位为px。这个尺寸的canvas不会显示在页面上,渲染过程会在页面外部进行。 渲染的图片过程需要通过js部分控制,执行draw方法后的Promise返回的内容为图片的Base64编码,可以通过脚本逻辑控制后续处理~

渲染过程

渲染过程采用链式操作方法,此方法只能在mounted之后运行,因为没有mounted时$refs.poster是undefined:

let posterRef = this.$refs.poster;
uni.showLoading({
    title: "渲染海报中"
});
this.src = await posterRef
    .setBackgroundColor("#F4F4F4") //指定渲染图片的背景色
    .addRect(0, 0, 750, 198, "#FEFEFE") //绘制矩形
    .addImage(require("@/static/logo.jpg"), 32, 48, 98, 98, true) //绘制圆图片,如果不绘制圆图片最后一个参数可以不传或传false,当最后一个参数为true时圆形的直径为w,h参数将没有意义
    .addQRCode("http://www.shengxinyustudio.com", 585, 22, 130, 130) //绘制二维码(不要太长否则会扫不出来)
    .addText("扫码查看我的主页", 581, 159, 20, "#333333") //绘制文本
    .addImage(require("@/static/logo.jpg"), 19, 219, 707, 451) //绘制云端图片时第一个参数直接传云端图片地址即可,不需要require。注意不要跨域
    .addRect(0, 690, 750, 158, "#FEFEFE")
    .addText("欢迎来到我的网站", 19, 708, 34, "#1A59FE", 453, false)
    .draw();
uni.hideLoading();

链式操作内置了背景图设置、矩形的绘制、本地/云端图片的绘制、二维码绘制与文本绘制五种绘制功能。最终draw方法返回的是Promise对象,也只有调用draw方法await成功后才可以认为渲染完成了。

保存图片

保存图片过程我已经集成了,只需要通过ref调用即可~

this.$refs.poster.saveImageToPhotosAlbum(this.src);

更多

更多的内容就不细说了。组件中有完整的代码注释哦~ 本代码我会持续更新!

隐私、权限声明

1. 本插件需要申请的系统权限列表:

保存图片时需要用户授权保存到相册

2. 本插件采集的数据、发送的服务器地址、以及数据用途说明:

插件不采集任何数据

3. 本插件是否包含广告,如包含需详细说明广告表达方式、展示频率:

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使用中有什么不明白的地方,就向插件作者提问吧~ 我要提问