LineTo画网格

The following code draws a grid in the client area of a window, spacing the lines 50pixels apart starting from the
upper left corner. The variable hwnd is assumed to be a handle to the window, hdc is a handle to the device
context, and x and y are integers: 

下面的程序代码从窗口的左上角开始，在显示区域中画一个网格，线与线之间相隔50个图素，其中hwnd是窗口句柄，hdc是设备内容句柄，而x和y是整数

 

    int x,y;
        RECT rect;
        GetClientRect(hwnd,&rect);  //该函数获取窗口客户区的坐标,用rect保存
        for(x=0;x<rect.right;x+=50)
        {
            MoveToEx(hDC,x,0,NULL);
            LineTo(hDC,x,rect.bottom);
        }
        for(y=0;y<rect.bottom;y+=50)
        {
            MoveToEx(hDC,0,y,NULL);
            LineTo(hDC,rect.right,y);
        }