910 lines
36 KiB
Markdown
910 lines
36 KiB
Markdown
# Painter 画板 测试版
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> uniapp 海报画板，更优雅的海报生成方案
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> [查看更多 站点 1](https://limeui.qcoon.cn/#/painter)
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> [查看更多 站点 2](http://liangei.gitee.io/limeui/#/painter)
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> Q 群：806744170
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## 平台兼容
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| H5 | 微信小程序 | 支付宝小程序 | 百度小程序 | 头条小程序 | QQ 小程序 | App |
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| --- | ---------- | ------------ | ---------- | ---------- | --------- | --- |
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| √ | √ | √ | 未测 | √ | √ | √ |
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## 安装
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在市场导入[海报画板](https://ext.dcloud.net.cn/plugin?id=2389)uni_modules版本的即可，无需`import`
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## 代码演示
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### 基本用法
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- 插件提供 JSON 及 XML 的方式绘制海报
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- 参考了 css 块状流布局模拟 css schema 方式。
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- 使用JSON的方式时，请使用驼峰key
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#### 方式一 XML
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- 提供`l-painter-view`、`l-painter-text`、`l-painter-image`、`l-painter-qrcode`四种类型组件
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- 通过 `css` 属性绘制样式，与 style 使用方式保持一致。
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```html
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<l-painter>
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<l-painter-view
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css="background: #07c160; height: 120rpx; width: 120rpx; display: inline-block"
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></l-painter-view>
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<l-painter-view
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css="background: #1989fa; height: 120rpx; width: 120rpx; border-top-right-radius: 60rpx; border-bottom-left-radius: 60rpx; display: inline-block; margin: 0 30rpx;"
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></l-painter-view>
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<l-painter-view
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css="background: #ff9d00; height: 120rpx; width: 120rpx; border-radius: 50%; display: inline-block"
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></l-painter-view>
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</l-painter>
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```
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#### 方式二 JSON
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- 在 json 里四种类型组件的`type`为`view`、`text`、`image`、`qrcode`
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- 通过 `board` 设置海报所需的 JSON 数据进行绘制或`ref`获取组件实例调用组件内的`render(json)`
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- 所有类型的 schema 都具有`css`字段，css 的 key 值使用**驼峰**如：`lineHeight`
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```html
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<l-painter :board="poster"/>
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```
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```js
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data() {
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return {
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poster: {
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css: {
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// 根节点若无尺寸，自动获取父级节点
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width: '750rpx'
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},
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views: [
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{
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css: {
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background: "#07c160",
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height: "120rpx",
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width: "120rpx",
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display: "inline-block"
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},
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type: "view"
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},
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{
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css: {
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background: "#1989fa",
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height: "120rpx",
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width: "120rpx",
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borderTopRightRadius: "60rpx",
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borderBottomLeftRadius: "60rpx",
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display: "inline-block",
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margin: "0 30rpx"
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},
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views: [],
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type: "view"
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},
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{
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css: {
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background: "#ff9d00",
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height: "120rpx",
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width: "120rpx",
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borderRadius: "50%",
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display: "inline-block"
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},
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views: [],
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type: "view"
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},
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]
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}
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}
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}
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```
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### View 容器
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- 类似于 `div` 可以嵌套承载更多的 view、text、image，qrcode 共同构建一颗完整的节点树
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- 在 JSON 里具有 `views` 的数组字段，用于嵌套承载节点。
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#### 方式一 XML
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```html
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<l-painter>
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<l-painter-view css="background: #f0f0f0; padding-top: 100rpx;">
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<l-painter-view
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css="background: #d9d9d9; width: 33.33%; height: 100rpx; display: inline-block"
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></l-painter-view>
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<l-painter-view
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css="background: #bfbfbf; width: 66.66%; height: 100rpx; display: inline-block"
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></l-painter-view>
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</l-painter-view>
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</l-painter>
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```
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#### 方式二 JSON
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```js
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{
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css: {},
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views: [
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{
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type: 'view',
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css: {
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background: '#f0f0f0',
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paddingTop: '100rpx'
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},
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views: [
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{
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type: 'view',
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css: {
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background: '#d9d9d9',
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width: '33.33%',
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height: '100rpx',
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display: 'inline-block'
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}
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},
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{
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type: 'view',
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css: {
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background: '#bfbfbf',
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width: '66.66%',
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height: '100rpx',
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display: 'inline-block'
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}
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}
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],
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}
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]
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}
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```
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### Text 文本
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- 通过 `text` 属性填写文本内容。
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- 支持`\n`换行符
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- 支持省略号，使用 css 的`line-clamp`设置行数，当文字内容超过会显示省略号。
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- 支持`text-decoration`
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#### 方式一 XML
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```html
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<l-painter>
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<l-painter-view css="background: #e0e2db; padding: 30rpx; color: #222a29">
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<l-painter-text
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text="登鹳雀楼\n白日依山尽，黄河入海流\n欲穷千里目，更上一层楼"
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/>
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<l-painter-text
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text="登鹳雀楼\n白日依山尽，黄河入海流\n欲穷千里目，更上一层楼"
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css="text-align:center; padding-top: 20rpx; text-decoration: line-through "
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/>
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<l-painter-text
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text="登鹳雀楼\n白日依山尽，黄河入海流\n欲穷千里目，更上一层楼"
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css="text-align:right; padding-top: 20rpx"
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/>
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<l-painter-text
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text="水调歌头\n明月几时有？把酒问青天。不知天上宫阙，今夕是何年。我欲乘风归去，又恐琼楼玉宇，高处不胜寒。起舞弄清影，何似在人间。"
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css="line-clamp: 3; padding-top: 20rpx; background: linear-gradient(,#ff971b 0%, #ff5000 100%); background-clip: text"
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/>
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</l-painter-view>
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</l-painter>
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```
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#### 方式二 JSON
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```js
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// 基础用法
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{
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type: 'text',
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text: '登鹳雀楼\n白日依山尽，黄河入海流\n欲穷千里目，更上一层楼',
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},
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{
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type: 'text',
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text: '登鹳雀楼\n白日依山尽，黄河入海流\n欲穷千里目，更上一层楼',
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css: {
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// 设置居中对齐
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textAlign: 'center',
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// 设置中划线
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textDecoration: 'line-through'
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}
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},
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{
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type: 'text',
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text: '登鹳雀楼\n白日依山尽，黄河入海流\n欲穷千里目，更上一层楼',
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css: {
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// 设置右对齐
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textAlign: 'right',
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}
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},
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{
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type: 'text',
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text: '登鹳雀楼\n白日依山尽，黄河入海流\n欲穷千里目，更上一层楼',
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css: {
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// 设置行数，超出显示省略号
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lineClamp: 3,
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// 渐变文字
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background: 'linear-gradient(,#ff971b 0%, #1989fa 100%)',
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backgroundClip: 'text'
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}
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}
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```
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### Image 图片
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- 通过 `src` 属性填写图片路径。
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- 图片路径支持：网络图片，本地 static 里的图片路径，缓存路径
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- 通过 `css` 的 `object-fit`属性可以设置图片的填充方式，可选值见下方 CSS 表格。
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- 通过 `css` 的 `object-position`配合 `object-fit` 可以设置图片的对齐方式，类似于`background-position`，详情见下方 CSS 表格。
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- 使用网络图片时：小程序需要去公众平台配置 [downloadFile](https://mp.weixin.qq.com/) 域名
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- 使用网络图片时：**H5 和 Nvue 需要决跨域问题**
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#### 方式一 XML
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```html
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<l-painter>
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<!-- 基础用法 -->
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<l-painter-image
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src="https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg"
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css="width: 200rpx; height: 200rpx"
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/>
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<!-- 填充方式 -->
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<!-- css object-fit 设置 填充方式 见下方表格-->
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<l-painter-image
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src="https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg"
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css="width: 200rpx; height: 200rpx; object-fit: contain; background: #eee"
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/>
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<!-- css object-position 设置 图片的对齐方式-->
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<l-painter-image
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src="https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg"
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css="width: 200rpx; height: 200rpx; object-fit: contain; object-position: 50% 50%; background: #eee"
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/>
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</l-painter>
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```
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#### 方式二 JSON
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```js
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// 基础用法
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{
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type: 'image',
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src: 'https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg',
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css: {
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width: '200rpx',
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height: '200rpx'
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}
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},
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// 填充方式
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// css objectFit 设置 填充方式 见下方表格
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{
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type: 'image',
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src: 'https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg',
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css: {
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width: '200rpx',
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height: '200rpx',
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objectFit: 'contain'
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}
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},
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// css objectPosition 设置 图片的对齐方式
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{
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type: 'image',
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src: 'https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg',
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css: {
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width: '200rpx',
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height: '200rpx',
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objectFit: 'contain',
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objectPosition: '50% 50%'
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}
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}
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```
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### Qrcode 二维码
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- 通过`text`属性填写需要生成二维码的文本。
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- 通过 `css` 里的 `color` 可设置生成码点的颜色。
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- 通过 `css` 里的 `background`可设置背景色。
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- 通过 `css `里的 `width`、`height`设置尺寸。
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#### 方式一 XML
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```html
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<l-painter>
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<l-painter-qrcode
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text="limeui.qcoon.cn"
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css="width: 200rpx; height: 200rpx"
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/>
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</l-painter>
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```
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#### 方式二 JSON
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```js
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{
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type: 'qrcode',
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text: 'limeui.qcoon.cn',
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css: {
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width: '200rpx',
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height: '200rpx',
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}
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}
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```
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### 生成图片
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- 1、通过设置`isCanvasToTempFilePath`自动生成图片并在 `@success` 事件里接收海报临时路径
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- 2、通过调用内部方法生成图片：
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```html
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<l-painter ref="painter">...code</l-painter>
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```
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```js
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this.$refs.painter.canvasToTempFilePathSync({
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fileType: "jpg",
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// 如果返回的是base64是无法使用 saveImageToPhotosAlbum，需要设置 pathType为url
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pathType: 'url',
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quality: 1,
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success: (res) => {
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console.log(res.tempFilePath);
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// 非H5 保存到相册
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// H5 提示用户长按图另存
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uni.saveImageToPhotosAlbum({
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filePath: res.tempFilePath,
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success: function () {
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console.log('save success');
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}
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});
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},
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});
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```
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### 主动调用方式
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- 通过获取组件实例内部的`render`函数 传递`JSON`即可
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```html
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<l-painter ref="painter" />
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```
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```js
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// 渲染
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this.$refs.painter.render(jsonSchema);
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// 生成图片
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this.$refs.painter.canvasToTempFilePathSync({
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fileType: "jpg",
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// 如果返回的是base64是无法使用 saveImageToPhotosAlbum，需要设置 pathType为url
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pathType: 'url',
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quality: 1,
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success: (res) => {
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console.log(res.tempFilePath);
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// 非H5 保存到相册
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uni.saveImageToPhotosAlbum({
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filePath: res.tempFilePath,
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success: function () {
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console.log('save success');
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}
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});
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},
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});
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```
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### H5跨域
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- 一般是需要后端或管理OSS资源的大佬处理
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- 一般OSS的处理方式:
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1、设置来源
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```cmd
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*
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```
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2、允许Methods
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```html
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GET
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```
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3、允许Headers
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```html
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access-control-allow-origin:*
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```
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4、最后如果还是不行,可试下给插件设置`useCORS`
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```html
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<l-painter useCORS>
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```
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### 海报示例
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- 提供一份示例，只把插件当成生成图片的工具，非必要不要在弹窗里使用。
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- 通过设置`isCanvasToTempFilePath`主动生成图片，再由 `@success` 事件接收海报临时路径
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- 设置`custom-style="position: fixed; left: 200%"`样式把画板移到屏幕之外，达到隐藏画板的效果。
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- **注意**：受平台影响海报画板最好不要隐藏，可能会无法生成图片。
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#### 方式一 XML
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```html
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<image :src="path" mode="widthFix"></image>
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<l-painter
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isCanvasToTempFilePath
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@success="path = $event"
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custom-style="position: fixed; left: 200%"
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css="width: 750rpx; padding-bottom: 40rpx; background: linear-gradient(,#ff971b 0%, #ff5000 100%)"
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>
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<l-painter-image
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src="https://cdn.jsdelivr.net/gh/liangei/image@latest/avatar-1.jpeg"
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css="margin-left: 40rpx; margin-top: 40rpx; width: 84rpx; height: 84rpx; border-radius: 50%;"
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/>
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<l-painter-view
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css="margin-top: 40rpx; padding-left: 20rpx; display: inline-block"
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>
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<l-painter-text
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text="隔壁老王"
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css="display: block; padding-bottom: 10rpx; color: #fff; font-size: 32rpx; fontWeight: bold"
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/>
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<l-painter-text
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text="为您挑选了一个好物"
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css="color: rgba(255,255,255,.7); font-size: 24rpx"
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/>
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</l-painter-view>
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<l-painter-view
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css="margin-left: 40rpx; margin-top: 30rpx; padding: 32rpx; box-sizing: border-box; background: #fff; border-radius: 16rpx; width: 670rpx; box-shadow: 0 20rpx 58rpx rgba(0,0,0,.15)"
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>
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<l-painter-image
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src="https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg"
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css="object-fit: cover; object-position: 50% 50%; width: 606rpx; height: 606rpx; border-radius: 12rpx;"
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/>
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<l-painter-view
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css="margin-top: 32rpx; color: #FF0000; font-weight: bold; font-size: 28rpx; line-height: 1em;"
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>
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||
<l-painter-text text="￥" css="vertical-align: bottom" />
|
||
<l-painter-text
|
||
text="39"
|
||
css="vertical-align: bottom; font-size: 58rpx"
|
||
/>
|
||
<l-painter-text text=".39" css="vertical-align: bottom" />
|
||
<l-painter-text
|
||
text="￥59.99"
|
||
css="vertical-align: bottom; padding-left: 10rpx; font-weight: normal; text-decoration: line-through; color: #999999"
|
||
/>
|
||
</l-painter-view>
|
||
<l-painter-view css="margin-top: 32rpx; font-size: 26rpx; color: #8c5400">
|
||
<l-painter-text text="自营" css="color: #212121; background: #ffb400;" />
|
||
<l-painter-text
|
||
text="30天最低价"
|
||
css="margin-left: 16rpx; background: #fff4d9; text-decoration: line-through;"
|
||
/>
|
||
<l-painter-text
|
||
text="满减优惠"
|
||
css="margin-left: 16rpx; background: #fff4d9"
|
||
/>
|
||
<l-painter-text
|
||
text="超高好评"
|
||
css="margin-left: 16rpx; background: #fff4d9"
|
||
/>
|
||
</l-painter-view>
|
||
<l-painter-view css="margin-top: 30rpx">
|
||
<l-painter-text
|
||
css="line-clamp: 2; color: #333333; line-height: 1.8em; font-size: 36rpx; width: 478rpx; padding-right:32rpx; box-sizing: border-box"
|
||
text="360儿童电话手表9X 智能语音问答定位支付手表 4G全网通20米游泳级防水视频通话拍照手表男女孩星空蓝"
|
||
></l-painter-text>
|
||
<l-painter-qrcode
|
||
css="width: 128rpx; height: 128rpx;"
|
||
text="limeui.qcoon.cn"
|
||
></l-painter-qrcode>
|
||
</l-painter-view>
|
||
</l-painter-view>
|
||
</l-painter>
|
||
```
|
||
|
||
```js
|
||
data() {
|
||
return {
|
||
path: ''
|
||
}
|
||
}
|
||
```
|
||
|
||
#### 方式二 JSON
|
||
|
||
```html
|
||
<image :src="path" mode="widthFix"></image>
|
||
<l-painter
|
||
:board="poster"
|
||
isCanvasToTempFilePath
|
||
@success="path = $event"
|
||
custom-style="position: fixed; left: 200%"
|
||
/>
|
||
```
|
||
|
||
```js
|
||
data() {
|
||
return {
|
||
path: '',
|
||
poster: {
|
||
css: {
|
||
width: "750rpx",
|
||
paddingBottom: "40rpx",
|
||
background: "linear-gradient(,#000 0%, #ff5000 100%)"
|
||
},
|
||
views: [
|
||
{
|
||
src: "https://fastly.jsdelivr.net/gh/liangei/image@latest/avatar-1.jpeg",
|
||
type: "image",
|
||
css: {
|
||
background: "#fff",
|
||
objectFit: "cover",
|
||
marginLeft: "40rpx",
|
||
marginTop: "40rpx",
|
||
width: "84rpx",
|
||
border: "2rpx solid #fff",
|
||
boxSizing: "border-box",
|
||
height: "84rpx",
|
||
borderRadius: "50%"
|
||
}
|
||
},
|
||
{
|
||
type: "view",
|
||
css: {
|
||
marginTop: "40rpx",
|
||
paddingLeft: "20rpx",
|
||
display: "inline-block"
|
||
},
|
||
views: [
|
||
{
|
||
text: "隔壁老王",
|
||
type: "text",
|
||
css: {
|
||
display: "block",
|
||
paddingBottom: "10rpx",
|
||
color: "#fff",
|
||
fontSize: "32rpx",
|
||
fontWeight: "bold"
|
||
}
|
||
},
|
||
{
|
||
text: "为您挑选了一个好物",
|
||
type: "text",
|
||
css: {
|
||
color: "rgba(255,255,255,.7)",
|
||
fontSize: "24rpx"
|
||
},
|
||
}
|
||
],
|
||
},
|
||
{
|
||
css: {
|
||
marginLeft: "40rpx",
|
||
marginTop: "30rpx",
|
||
padding: "32rpx",
|
||
boxSizing: "border-box",
|
||
background: "#fff",
|
||
borderRadius: "16rpx",
|
||
width: "670rpx",
|
||
boxShadow: "0 20rpx 58rpx rgba(0,0,0,.15)"
|
||
},
|
||
views: [
|
||
{
|
||
src: "https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg",
|
||
type: "image",
|
||
css: {
|
||
objectFit: "cover",
|
||
objectPosition: "50% 50%",
|
||
width: "606rpx",
|
||
height: "606rpx"
|
||
},
|
||
}, {
|
||
css: {
|
||
marginTop: "32rpx",
|
||
color: "#FF0000",
|
||
fontWeight: "bold",
|
||
fontSize: "28rpx",
|
||
lineHeight: "1em"
|
||
},
|
||
views: [{
|
||
text: "￥",
|
||
type: "text",
|
||
css: {
|
||
verticalAlign: "bottom"
|
||
},
|
||
}, {
|
||
text: "39",
|
||
type: "text",
|
||
css: {
|
||
verticalAlign: "bottom",
|
||
fontSize: "58rpx"
|
||
},
|
||
}, {
|
||
text: ".39",
|
||
type: "text",
|
||
css: {
|
||
verticalAlign: "bottom"
|
||
},
|
||
}, {
|
||
text: "￥59.99",
|
||
type: "text",
|
||
css: {
|
||
verticalAlign: "bottom",
|
||
paddingLeft: "10rpx",
|
||
fontWeight: "normal",
|
||
textDecoration: "line-through",
|
||
color: "#999999"
|
||
}
|
||
}],
|
||
|
||
type: "view"
|
||
}, {
|
||
css: {
|
||
marginTop: "32rpx",
|
||
fontSize: "26rpx",
|
||
color: "#8c5400"
|
||
},
|
||
views: [{
|
||
text: "自营",
|
||
type: "text",
|
||
css: {
|
||
color: "#212121",
|
||
background: "#ffb400"
|
||
},
|
||
}, {
|
||
text: "30天最低价",
|
||
type: "text",
|
||
css: {
|
||
marginLeft: "16rpx",
|
||
background: "#fff4d9",
|
||
textDecoration: "line-through"
|
||
},
|
||
}, {
|
||
text: "满减优惠",
|
||
type: "text",
|
||
css: {
|
||
marginLeft: "16rpx",
|
||
background: "#fff4d9"
|
||
},
|
||
}, {
|
||
text: "超高好评",
|
||
type: "text",
|
||
css: {
|
||
marginLeft: "16rpx",
|
||
background: "#fff4d9"
|
||
},
|
||
|
||
}],
|
||
|
||
type: "view"
|
||
}, {
|
||
css: {
|
||
marginTop: "30rpx"
|
||
},
|
||
views: [
|
||
{
|
||
text: "360儿童电话手表9X 智能语音问答定位支付手表 4G全网通20米游泳级防水视频通话拍照手表男女孩星空蓝",
|
||
type: "text",
|
||
css: {
|
||
paddingRight: "32rpx",
|
||
boxSizing: "border-box",
|
||
lineClamp: 2,
|
||
color: "#333333",
|
||
lineHeight: "1.8em",
|
||
fontSize: "36rpx",
|
||
width: "478rpx"
|
||
},
|
||
}, {
|
||
text: "limeui.qcoon.cn",
|
||
type: "qrcode",
|
||
css: {
|
||
width: "128rpx",
|
||
height: "128rpx",
|
||
},
|
||
|
||
}],
|
||
type: "view"
|
||
}],
|
||
type: "view"
|
||
}
|
||
]
|
||
}
|
||
}
|
||
}
|
||
```
|
||
|
||
### Nvue
|
||
- 必须为HBX 3.4.11及以上
|
||
|
||
|
||
### 原生小程序
|
||
|
||
- 插件里的`painter.js`支持在原生小程序中使用
|
||
- new Painter 之后在`source`里传入 JSON
|
||
- 再调用`render`绘制海报
|
||
- 如需生成图片，请查看微信小程序 cavnas 的[canvasToTempFilePath](https://developers.weixin.qq.com/miniprogram/dev/api/canvas/wx.canvasToTempFilePath.html)
|
||
|
||
```html
|
||
<canvas type="2d" id="painter" style="width: 100%"></canvas>
|
||
```
|
||
|
||
```js
|
||
import { Painter } from "./painter";
|
||
page({
|
||
data: {
|
||
poster: {
|
||
css: {
|
||
width: "750rpx",
|
||
},
|
||
views: [
|
||
{
|
||
type: "view",
|
||
css: {
|
||
background: "#d2d4c8",
|
||
paddingTop: "100rpx",
|
||
},
|
||
views: [
|
||
{
|
||
type: "view",
|
||
css: {
|
||
background: "#5f7470",
|
||
width: "33.33%",
|
||
height: "100rpx",
|
||
display: "inline-block",
|
||
},
|
||
},
|
||
{
|
||
type: "view",
|
||
css: {
|
||
background: "#889696",
|
||
width: "33.33%",
|
||
height: "100rpx",
|
||
display: "inline-block",
|
||
},
|
||
},
|
||
{
|
||
type: "view",
|
||
css: {
|
||
background: "#b8bdb5",
|
||
width: "33.33%",
|
||
height: "100rpx",
|
||
display: "inline-block",
|
||
},
|
||
},
|
||
],
|
||
},
|
||
],
|
||
},
|
||
},
|
||
async onLoad() {
|
||
const res = await this.getCentext();
|
||
const painter = new Painter(res);
|
||
// 返回计算布局后的整个内容尺寸
|
||
const { width, height } = await painter.source(this.data.poster);
|
||
// 得到计算后的尺寸后 可给canvas尺寸赋值，达到动态响应效果
|
||
// 渲染
|
||
await painter.render();
|
||
},
|
||
// 获取canvas 2d
|
||
// 非2d也可以使用这里只是举个例子
|
||
getCentext() {
|
||
return new Promise((resolve) => {
|
||
wx.createSelectorQuery()
|
||
.select(`#painter`)
|
||
.node()
|
||
.exec((res) => {
|
||
let { node: canvas } = res[0];
|
||
resolve({
|
||
canvas,
|
||
context: canvas.getContext("2d"),
|
||
width: canvas.width,
|
||
height: canvas.height,
|
||
pixelRatio: 2,
|
||
});
|
||
});
|
||
});
|
||
},
|
||
});
|
||
```
|
||
|
||
### 旧版(1.6.x)更新
|
||
|
||
- 由于 1.8.x 版放弃了以定位的方式，所以 1.6.x 版更新之后要每个样式都加上`position: absolute`
|
||
- 旧版的 `image` mode 模式被放弃，使用`object-fit`
|
||
- 旧版的 `isRenderImage` 改成 `is-canvas-to-temp-filePath`
|
||
- 旧版的 `maxLines` 改成 `line-clamp`
|
||
|
||
## API
|
||
|
||
### Props
|
||
|
||
| 参数 | 说明 | 类型 | 默认值 |
|
||
| -------------------------- | ------------------------------------------------------------ | ---------------- | ------------ |
|
||
| board | JSON 方式的海报元素对象集 | <em>object</em> | - |
|
||
| css | 海报最外层的样式，可以理解为`body` | <em>object</em> | 参数请向下看 |
|
||
| custom-style | canvas 自定义样式 | <em>string</em> | |
|
||
| is-canvas-to-temp-filePath | 是否生成图片，在`@success`事件接收图片地址 | <em>boolean</em> | `false` |
|
||
| after-delay | 生成图片错乱，可延时生成图片 | <em>number</em> | `100` |
|
||
| type | canvas 类型，对微信头条支付宝小程序可有效,可选值：`2d`，`''` | <em>string</em> | `2d` |
|
||
| file-type | 生成图片的后缀类型, 可选值：`png`、`jpg` | <em>string</em> | `png` |
|
||
| path-type | 生成图片路径类型，可选值`url`、`base64` | <em>string</em> | `-` |
|
||
| pixel-ratio | 生成图片的像素密度，默认为对应手机的像素密度，`nvue`无效 | <em>number</em> | `-` |
|
||
| width | **废弃** 画板的宽度，一般只用于通过内部方法时加上 | <em>number</em> | `` |
|
||
| height | **废弃** 画板的高度 ，同上 | <em>number</em> | `` |
|
||
|
||
### css
|
||
| 属性名 | 支持的值或类型 | 默认值 |
|
||
| ----------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------- |
|
||
| (min\max)width | 支持`%`、`rpx`、`px` | - |
|
||
| height | 同上 | - |
|
||
| color | `string` | - |
|
||
| position | 定位，可选值：`absolute`、`fixed` | - |
|
||
| ↳ left、top、right、bottom | 配合`position`才生效，支持`%`、`rpx`、`px` | - |
|
||
| margin | 可简写或各方向分别写，如：`margin-top`，支持`auto`、`rpx`、`px` | - |
|
||
| padding | 可简写或各方向分别写，支持`rpx`、`px` | - |
|
||
| border | 可简写或各个值分开写：`border-width`、`border-style` 、`border-color`，简写请按顺序写 | - |
|
||
| line-clamp | `number`，超过行数显示省略号 | - |
|
||
| vertical-align | 文字垂直对齐，可选值：`bottom`、`top`、`middle` | `middle` |
|
||
| line-height | 文字行高，支持`rpx`、`px`、`em` | `1.4em` |
|
||
| font-weight | 文字粗细，可选值：`normal`、`bold` | `normal` |
|
||
| font-size | 文字大小，`string`，支持`rpx`、`px` | `14px` |
|
||
| text-decoration | 文本修饰，可选值：`underline` 、`line-through`、`overline` | - |
|
||
| text-align | 文本水平对齐，可选值：`right` 、`center` | `left` |
|
||
| display | 框类型，可选值：`block`、`inline-block`、`flex`、`none`，当为`none`时是不渲染该段, `flex`功能简陋。 | - |
|
||
| flex | 配合 display: flex; 属性定义了在分配多余空间,目前只用为数值如： flex: 1 | - |
|
||
| align-self | 配合 display: flex; 单个项目垂直轴对齐方式: `flex-start` `flex-end` `center` | `flex-start` |
|
||
| justify-content | 配合 display: flex; 水平轴对齐方式: `flex-start` `flex-end` `center` | `flex-start` |
|
||
| align-items | 配合 display: flex; 垂直轴对齐方式: `flex-start` `flex-end` `center` | `flex-start` |
|
||
| border-radius | 圆角边框，支持`%`、`rpx`、`px` | - |
|
||
| box-sizing | 可选值：`border-box` | - |
|
||
| box-shadow | 投影 | - |
|
||
| background(color) | 支持渐变，但必须写百分比！如:`linear-gradient(,#ff971b 0%, #ff5000 100%)`、`radial-gradient(#0ff 15%, #f0f 60%)`,目前 radial-gradient 渐变的圆心为元素中点，半径为最长边，不支持设置 | - |
|
||
| background-clip | 文字渐变，配合`background`背景渐变，设置`background-clip: text` 达到文字渐变效果 | - |
|
||
| background-image | view 元素背景：`url(src)`,若只是设置背景图，请不要设置`background-repeat` | - |
|
||
| background-repeat | 设置是否及如何重复背景纹理，可选值：`repeat`、`repeat-x`、`repeat-y`、`no-repeat` | `repeat` |
|
||
| [object-fit](https://developer.mozilla.org/zh-CN/docs/Web/CSS/object-fit/) | 图片元素适应容器方式,类似于`mode`,可选值：`cover`、 `contain`、 `fill`、 `none` | - |
|
||
| [object-position](https://developer.mozilla.org/zh-CN/docs/Web/CSS/object-position) | 图片的对齐方式，配合`object-fit`使用 | - |
|
||
|
||
### 图片填充模式 object-fit
|
||
|
||
| 名称 | 含义 |
|
||
| ------- | ------------------------------------------------------ |
|
||
| contain | 保持宽高缩放图片，使图片的长边能完全显示出来 |
|
||
| cover | 保持宽高缩放图片，使图片的短边能完全显示出来，裁剪长边 |
|
||
| fill | 拉伸图片，使图片填满元素 |
|
||
| none | 保持图片原有尺寸 |
|
||
|
||
### 事件 Events
|
||
|
||
| 事件名 | 说明 | 返回值 |
|
||
| -------- | ---------------------------------------------------------------- | ------ |
|
||
| success | 生成图片成功,若使用`is-canvas-to-temp-filePath` 可以接收图片地址 | path |
|
||
| fail | 生成图片失败 | error |
|
||
| done | 绘制成功 | |
|
||
| progress | 绘制进度 | number |
|
||
|
||
### 内部函数 Ref
|
||
| 事件名 | 说明 | 返回值 |
|
||
| -------- | ---------------------------------------------------------------- | ------ |
|
||
| render(object) | 渲染器，传入JSON 绘制海报 | promise |
|
||
| [canvasToTempFilePath](https://uniapp.dcloud.io/api/canvas/canvasToTempFilePath.html#canvastotempfilepath)(object) | 把当前画布指定区域的内容导出生成指定大小的图片，并返回文件临时路径。 | |
|
||
| canvasToTempFilePathSync(object) | 同步接口，同上 | |
|
||
|
||
|
||
## 常见问题
|
||
|
||
- 1、H5 端使用网络图片需要解决跨域问题。
|
||
- 2、小程序使用网络图片需要去公众平台增加下载白名单！二级域名也需要配！
|
||
- 3、H5 端生成图片是 base64，有时显示只有一半可以使用原生标签`<IMG/>`
|
||
- 4、发生保存图片倾斜变形或提示 native buffer exceed size limit 时，使用 pixel-ratio="2"参数，降分辨率。
|
||
- 5、h5 保存图片不需要调接口，提示用户长按图片保存。
|
||
- 6、画板不能隐藏，包括`v-if`，`v-show`、`display:none`、`opacity:0`，另外也不要把画板放在弹窗里。如果需要隐藏画板请设置 `custom-style="position: fixed; left: 200%"`
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- 7、微信小程序 canvas 2d **不支持真机调试**，请使用真机预览方式。
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- 8、微信小程序打开调试时可以生但并闭无法生成时，这种情况一般是没有在公众号配置download域名
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- 9、HBX 3.4.5之前的版本不支持vue3
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- 10、在微信开发工具上 canvas 层级最高无法zindex，并不影响真机
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- 11、请不要导入非uni_modules插件
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- 华为手机 APP 上无法生成图片，请使用 HBX2.9.11++（已过时，忽略这条）
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- IOS APP 请勿使用 HBX2.9.3.20201014 的版本！这个版本无法生成图片。（已过时，忽略这条）
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- 苹果微信 7.0.20 存在闪退和图片无法 onload 为微信 bug（已过时，忽略这条）
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## 打赏
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如果你觉得本插件，解决了你的问题，赠人玫瑰，手留余香。
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