用户可以使用鼠标在屏幕上绘制出电路板上的各个元器件；可以用鼠标实现器件图的放大和缩小；可以调整器件图的位置；可以定义把绘制好的器件图以文件的形式存储起来。-Users can use the mouse on the screen to map out the various components of circuit boards can realize with the mouse device map zoom in and out can adjust the location of