基于Qt/E的嵌入式实时曲线显示界面设计与实现

Design and implementation of embedded real-time curve display interface based on the Qt/E

为解决手持设备实测数据曲线绘制时间过长、屏幕映射时会出现屏幕闪烁的现象,以及数据需要及时保存和回调查看的问题,提出了在Qt4下将QGraphicsScene类和QList<T>容器类结合起来实现采集数据的实时显示方法,该方法把QGraphicsScene类作为父对象,将QList<T>容器类的值类型T设为QGraphicsItem,将新采集的数据以push_back的方式添加于QList的末端。应用该方法后,所设计的曲线显示界面实时性与双缓冲法相比有了很大提升,同时可以对数据进行保存,并将用户保存的数据以曲线的形式回调出来,方便用户对不同时期测试数据进行比较分析。

The handheld devices cost too much time to draw the real-time curve of test data,and the screen mapping will appear in the screen flicker phenomenon,as well as the data need to be saved and callback in time.In order to solve these problems,the QGraphicsScene class and QListT container based on Qt4 are combined to achieve the data collection immediately display.The QGraphicsScene is used as father object,the value of the QListT container class is defined as QGraphicsItem,and the new collected data will be added at the at the end to QList.This method can improve the efficiency of curve display interface than double buffer method in real-time performance,and the data can be saved.The saved data also can be callback in the form of curve.It is convenient for users to compare and analyze the test data in different periods.