在控制台下使用windowsGDI绘图的时候后面前一个绘图不会被擦除

#include <windows.h>
#include <stdlib.h>
#include <math.h>
#include <time.h>
HWND GetConsoleHwnd(void);
main()
{
HPEN hPen=CreatePen(PS_SOLID,2,RGB(76,96,107));
HPEN hPenw=CreatePen(PS_SOLID,2,RGB(25,255,255));
double PI=2*asin(1.0);
POINT Original={320,200};
int i,Min=0;
time_t T1;
struct tm *ptimer;
HWND hhandle=GetConsoleHwnd();
HDC hDC=GetDC(hhandle);
for(i=0;i<=99;i++)
{
T1=time(NULL);
ptimer=localtime(&T1);
Min=ptimer->tm_sec;
SelectObject(hDC,hPenw);
MoveToEx(hDC,Original.x,Original.y,NULL);
LineTo(hDC,Original.x+70*cos(360/60*PI/180*(double)Min),Original.y+70*sin(360/60*PI/180*(double)Min));
DeleteObject(hPen);
SelectObject(hDC,hPen);
MoveToEx(hDC,Original.x,Original.y,NULL);
LineTo(hDC,Original.x+70*cos(360/60*PI/180*(double)Min),Original.y+70*sin(360/60*PI/180*(double)Min));
DeleteObject(hPen);
Sleep(1000);
}
return 0;
}
HWND GetConsoleHwnd(void)
{
#define MY_BUFSIZE 1024
HWND hwndFound;
char pszNewWindowTitle[MY_BUFSIZE];
char pszOldWindowTitle[MY_BUFSIZE];
GetConsoleTitle(pszOldWindowTitle, MY_BUFSIZE);

wsprintf(pszNewWindowTitle,"%d/%d",
GetTickCount(),
GetCurrentProcessId());

SetConsoleTitle(pszNewWindowTitle);
Sleep(40);
hwndFound=FindWindow(NULL, pszNewWindowTitle);
SetConsoleTitle(pszOldWindowTitle);
return(hwndFound);
}

Sleep(1000);
     // 区域无效
     RECT rect={0,0,2000,2000};
     InvalidateRect(hhandle,&rect,TRUE);
     // 更新
     UpdateWindow(hhandle);
    }