963 lines
39 KiB
Markdown
963 lines
39 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:1169785031
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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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### 插件demo
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- lime-painter 为 demo
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- 位于 uni_modules/lime-painter/components/lime-painter
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- 导入插件后直接使用可查看demo
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```vue
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<lime-painter />
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```
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### 基本用法
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- 插件提供 JSON 及 Template 的方式绘制海报
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- 参考 css 块状流布局模拟 css schema。
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- 另外flex布局还不是成完善,请谨慎使用,普通的流布局我觉得已经够用了。
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#### 方式一 Template
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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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//如果使用Template出现顺序错乱,可使用`template` 等所有变量完成再显示
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<template v-if="show">
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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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<template>
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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 Template
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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 Template
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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,**字节的static目录是写相对路径**
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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 Template
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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 Template
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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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### 富文本
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- 这是一个有限支持的测试能力,只能通过JSON方式,不要抱太大希望!
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- 首先需要把富文本转成JSON,这需要引入`parser`这个包,如果你不使用是不会进入主包
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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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import parseHtml from '@/uni_modules/lime-painter/parser'
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const json = parseHtml(`<p><span>测试测试</span><img src="/static/logo.png"/></p>`)
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this.$refs.painter.render(json)
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```
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### 生成图片
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- 方式1、通过设置`isCanvasToTempFilePath`自动生成图片并在 `@success` 事件里接收海报临时路径
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- 方式2、通过调用内部方法生成图片:
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```html
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<l-painter ref="painter">...code</l-painter>
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```
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```js
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this.$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`hidden`隐藏画板。
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请注意,示例用到了图片,海报的渲染是包括下载图片的时间,也许在某天图片会失效或访问超级慢,请更换为你的图片再查看,另外如果你是小程序请在使用示例时把**不校验合法域名**勾上!!!!!不然不显示还以为是插件的锅,求求了大佬们!
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#### 方式一 Template
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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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hidden
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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://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg"
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css="margin-left: 40rpx; margin-top: 40rpx; width: 84rpx; height: 84rpx; border-radius: 50%;"
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/>
|
||
<l-painter-view
|
||
css="margin-top: 40rpx; padding-left: 20rpx; display: inline-block"
|
||
>
|
||
<l-painter-text
|
||
text="隔壁老王"
|
||
css="display: block; padding-bottom: 10rpx; color: #fff; font-size: 32rpx; fontWeight: bold"
|
||
/>
|
||
<l-painter-text
|
||
text="为您挑选了一个好物"
|
||
css="color: rgba(255,255,255,.7); font-size: 24rpx"
|
||
/>
|
||
</l-painter-view>
|
||
<l-painter-view
|
||
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)"
|
||
>
|
||
<l-painter-image
|
||
src="https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg"
|
||
css="object-fit: cover; object-position: 50% 50%; width: 606rpx; height: 606rpx; border-radius: 12rpx;"
|
||
/>
|
||
<l-painter-view
|
||
css="margin-top: 32rpx; color: #FF0000; font-weight: bold; font-size: 28rpx; line-height: 1em;"
|
||
>
|
||
<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"
|
||
hidden
|
||
/>
|
||
```
|
||
|
||
```js
|
||
data() {
|
||
return {
|
||
path: '',
|
||
poster: {
|
||
css: {
|
||
width: "750rpx",
|
||
paddingBottom: "40rpx",
|
||
background: "linear-gradient(,#000 0%, #ff5000 100%)"
|
||
},
|
||
views: [
|
||
{
|
||
src: "https://m.360buyimg.com/babel/jfs/t1/196317/32/13733/288158/60f4ea39E6fb378ed/d69205b1a8ed3c97.jpg",
|
||
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"
|
||
}
|
||
]
|
||
}
|
||
}
|
||
}
|
||
```
|
||
|
||
|
||
### 自定义字体
|
||
- 需要平台的支持,已知微信小程序支持,其它的没试过,如果可行请告之
|
||
|
||
```
|
||
// 需要在app.vue中下载字体
|
||
uni.loadFontFace({
|
||
global:true,
|
||
scopes: ['native'],
|
||
family: '自定义字体名称',
|
||
source: 'url("https://sungd.github.io/Pacifico.ttf")',
|
||
|
||
success() {
|
||
console.log('success')
|
||
}
|
||
})
|
||
|
||
|
||
// 然后就可以在插件的css中写font-family: '自定义字体名称'
|
||
```
|
||
|
||
|
||
### 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 需要传一个 createImage 方法用于获取图片信息 即把 getImageInfo 的 success 通过 promise resolve 返回
|
||
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,
|
||
// createImage: getImageInfo()
|
||
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-file-path`
|
||
- 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 | 海报内容最外层的样式,可以理解为`body` | <em>object</em> | 参数请向下看 |
|
||
| custom-style | canvas 元素的样式 | <em>string</em> | |
|
||
| hidden | 隐藏画板 | <em>boolean</em> | `false` |
|
||
| is-canvas-to-temp-file-path | 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> | `-` |
|
||
| hidpi | H5和APP是否使用高清处理 | <em>boolean</em> | `true` |
|
||
| 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-stroke | 文字描边,可简写或各个值分开写,如:`text-stroke-color`, `text-stroke-width` | - |
|
||
| 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` | - |
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| [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 | - |
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### 图片填充模式 object-fit
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| 名称 | 含义 |
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| ------- | ------------------------------------------------------ |
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| contain | 保持宽高缩放图片,使图片的长边能完全显示出来 |
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| 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 |
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| fill | 拉伸图片,使图片填满元素 |
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| none | 保持图片原有尺寸 |
|
||
|
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### 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 |
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| done | 绘制成功 | |
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| progress | 绘制进度 | number |
|
||
|
||
### 暴露函数 Expose
|
||
| 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%"`
|
||
- 7、微信小程序真机调试请使用 **真机调试2.0**,不支持1.0。
|
||
- 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
|
||
- 9、HBX 3.4.5之前的版本不支持vue3
|
||
- 10、在微信开发工具上 canvas 层级最高无法zindex,并不影响真机
|
||
- 11、请不要导入非uni_modules插件
|
||
- 12、关于QQ小程序 报 Propertyor method"toJSON"is not defined 请把基础库调到 1.50.3
|
||
- 13、支付宝小程序 IDE 不支持 生成图片 请以真机调试结果为准
|
||
- 14、返回值为字符串 `data:,` 大概是尺寸超过限制,设置 pixel-ratio="2"
|
||
- 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)
|
||
- 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)
|
||
- 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)
|
||
- 微信小程序 IOS 旧接口 如父级设置圆角,子级也设会导致子级的失效,为旧接口BUG。
|
||
- 微信小程序 安卓 旧接口 如使用图片必须加背景色,为旧接口BUG。
|
||
- 微信小程序 安卓端 [图片可能在首次可以加载成功,再次加载会不触发任何事件](https://developers.weixin.qq.com/community/develop/doc/000ee2b8dacf4009337f51f4556800?highLine=canvas%25202d%2520createImage),临时解决方法是给图片加个时间戳
|
||
## 打赏
|
||
|
||
如果你觉得本插件,解决了你的问题,赠人玫瑰,手留余香。
|
||
|
||
![](https://testingcf.jsdelivr.net/gh/liangei/image@1.9/alipay.png)
|
||
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