利用VC++ 实现局部放大功能 该程序利用StretchBlt（）函数，较快捷、方便的实现该功能-Using VC++ to achieve local amplification function

一款VC写的心电图绘制软件，从串口接收心电图数据，分包，放大后绘制出心电图形。并带有50Hz滤波函数。-Written by a VC ECG mapping software, serial receive data from the ECG, subcontracting, draw amplified electrocardiogram shape. With a 50Hz filter function.

圆锥盒子工具，包括交互功能，可以实现放大缩小旋转等功能。-Tapered tool box, including the interaction capabilities