Mashiro_Sorata
2 years ago
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# 说明 |
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<div align="center"><img src="https://p.qlogo.cn/zc_icon/0/5a4b53837d0debc26e26a1895cc4802b16284484276385/0.png" style="zoom:80%;" /></div> |
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下面用**demo2**的例子演示怎么在同一个Style插件中新增一个Style,该Style在**demo1**的基础上加入颜色以及幅度调节设置项,如上图所示。 |
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**demo2**的根目录为`top.mashiros.3rd-party-style-demo.advp`,目录结构如下所示: |
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```powershell |
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top.mashiros.3rd-party-style-demo.advp |
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├── demo1 |
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│ └── Style.qml |
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├── demo2 |
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│ ├── Config.qml |
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│ └── Style.qml |
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└── package.json |
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``` |
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# *package.json* |
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修改**demo1**中的*package.json*文件,在`resources`中加入**demo2**新增的Style,如下所示。 |
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```json |
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{ |
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"name": "top.mashiros.3rd-party-style-demo.advp", |
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"version": "0.0.1", |
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"title": { |
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"en": "ADV-Plugin 3rd party style demo", |
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"zh": "音频可视化插件第三方样式演示" |
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}, |
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"description": "3rd party style demo for ADV-Plugin", |
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"author": { |
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"name": "Mashiro_Sorata", |
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"email": "mashiro_sorata@qq.com", |
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"url": "http://www.mashiros.top/" |
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}, |
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"resources": [ |
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{ |
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"location": "/3rd-party-demo1", |
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"catalog": "top.mashiros.advp-style", |
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"title": "3rd party Demo1", |
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"entry": "./demo1" |
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}, |
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{ |
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"location": "/3rd-party-demo2", |
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"catalog": "top.mashiros.advp-style", |
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"title": "3rd party Demo2", |
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"entry": "./demo2" |
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} |
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] |
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} |
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``` |
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# *Style.qml* |
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*package.json*更新完成,现在在**demo1**的基础上加入颜色与幅度调节设置项。这里我们需要用到`StyleAPI`的属性`configs`来读取*Config.qml*中的设置项。方法为:需要读取的Preference设置项的`name`作为`configs`的键值。如需要读取下面`ColorPreference`的值,则其对应值为`configs["Color"]`。 |
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```qml |
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P.ColorPreference { |
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name: "Color" |
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label: qsTr("颜色") |
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defaultValue: "red" |
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} |
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``` |
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下面为**demo2**的*Style.qml*代码实现,代码功能说明写在了注释里。 |
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```qml |
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import QtQuick 2.12 |
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//通过相对路径导入ADV-Plugin插件目录下qml/api文件夹,调用StyleAPI.qml组件 |
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import "../../top.mashiros.widget.advp/qml/api" |
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StyleAPI { |
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//幅度比例系数,读取Config.qml的设置项"幅度比例"的值 |
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readonly property real am_ratio: 400/configs["AM Ratio"] |
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//音频数据更新时的处理代码,参数是长度为129的数组data |
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onAudioDataUpdeted: { |
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//清空画布 |
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context.clearRect(0, 0, width, height); |
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//左声道音量 |
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let left_channel = 0; |
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//右声道音量 |
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let right_channel = 0; |
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//取前128位左右声道的数据进行处理 |
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for (let i=0;i<128;i++) { |
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if(i<64) { |
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//左声道FFT数据求和 |
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left_channel += data[i]; |
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} else { |
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//右声道FFT数据求和 |
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right_channel += data[i]; |
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} |
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} |
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//利用最后一位归一化系数data[128]进行动态归一化,其中400/am_ratio为最大高度值的调节系数 |
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let normalize = am_ratio*data[128]/height; |
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left_channel /= normalize; |
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right_channel /= normalize; |
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//绘制左声道 |
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context.fillRect(0,height,width*0.45,-left_channel); |
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//绘制右声道 |
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context.fillRect(width*0.55,height,width*0.45,-right_channel); |
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//填充矩形 |
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context.fill(); |
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//QML Canvas绘制图形(绘制后需要显示必须调用canvas的requestPaint方法) |
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requestPaint(); |
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} |
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//属性configs或者context改变时的处理代码,无参数 |
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onConfigsUpdated: { |
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//给canvas的context赋值初始样式(填充颜色),避免在onAudioDataUpdeted处理代码中重复调用 |
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context.fillStyle = configs["Color"]; |
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} |
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} |
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``` |
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# *Config.qml* |
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此文件为选项配置文件,让Style增加更多可自定义的设置项。此文件需要在`resources`定义的`entry`目录下。 |
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下面为**demo2**的*Config.qml*代码实现。 |
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```qml |
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import QtQuick 2.12 |
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import NERvGear.Preferences 1.0 as P |
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//通过相对路径导入ADV-Plugin插件目录下qml/api文件夹,调用CfgAPI.qml组件 |
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import "../../top.mashiros.widget.advp/qml/api" |
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CfgAPI { |
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version: "0.0.1" |
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cfg_height: 500 |
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P.ColorPreference { |
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name: "Color" |
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label: qsTr("颜色") |
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defaultValue: "#FF4500" |
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} |
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P.Separator {} |
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P.SliderPreference { |
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name: "AM Ratio" |
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label: qsTr("幅度比例") |
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from: 1 |
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to: 50 |
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stepSize: 1 |
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defaultValue: 20 |
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displayValue: value + "%" |
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} |
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} |
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``` |
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完成代码后,启动SDK程序加载挂件,切换Style到**3rd party Demo2**的选项,即可在挂件处进行预览(记得播放音频)。 |
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