了解如何使用Canvas API在Flutter应用上绘制曲线图。
如果，你有一些数据，你想做一个曲线图？有很多不错的Flutter库可以完成这项工作。但是，如果您想要一个独特漂亮的图表，完全符合您的应用程序的设计，您将需要从头开始构建他。
Flutter的Canvas API是绘制自定义图标的完美工具。这个API非常直观。
在深入了解Canvas API之前，你应该至少具有中等水平的Flutter经验。如果这听起来像你，那么系好安全带并准备好构建一些很棒的图标！
在本教程中，您将将构建LOLTracker，这是一款可以记录您笑的频率的应用程序。这个简单的应用程序将帮助您掌握一下Flutter原则：
学习使用小部件绘制曲线CustomPaint() 映射曲线以跟踪数据集中的数据 在图标的x轴和y轴添加标签
最终项目的目标是变成下面的效果，咱们先睹为快：
实现细节请参考博客： Flutter 中的曲线图
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