iPhone平台上开发的应用程序，在屏幕上绘制直线，实现直线随手指一动等，可用于股票等应用的制作-iPhone platform development of applications that draw a straight line on the screen to achieve a straight line with the finger movement and so on, can be used for applications such as the production of

主要介绍IOS开发中如何用Quartz 2D绘制线段，直线，虚线之类的东东，比较有用！-IOS development focuses on how to use Quartz 2D drawing lines, straight lines, dashed like stuff, more useful!