vc++api图形运行问题
#include <windows.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
POINT T,T0,Tt;
long WINAPI WndProc( HWND hWnd,UINT iMessage,UINT wParam,LONG lParam );
BOOL InitWindowsClass( HINSTANCE hInstance );
BOOL InitWindows( HINSTANCE hInstance, int nCmdShow );
int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine,int nCmdShow)
{
MSG Message;
T.x=121;
T.y=120;
T0.x=122;
T0.y=121;

if(!InitWindowsClass(hInstance))
return FALSE;
if(!InitWindows(hInstance,nCmdShow))
return FALSE;
while(GetMessage(&Message,0,0,0))
{
TranslateMessage(&Message);
DispatchMessage(&Message);
}
return Message.wParam;
}
long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG lParam)
{
HDC hDC;
HBRUSH hBrush;
HPEN hPen;
PAINTSTRUCT PtStr;



switch(iMessage)
{
case WM_PAINT:
hDC=BeginPaint(hWnd,&PtStr);


//SetMapMode(hDC,MM_ANISOTROPIC);
hPen=(HPEN)GetStockObject(BLACK_PEN);
hBrush=(HBRUSH)GetStockObject(DKGRAY_BRUSH);


SelectObject(hDC,hPen);
Rectangle(hDC,1,1,1023,540);
SelectObject(hDC,hBrush);

//RoundRect(hDC,50,120,100,200,15,15);
//hBrush=(HBRUSH)GetStockObject(LTGRAY_BRUSH);
//SelectObject(hDC,hBrush);
//ScreenToClient(hWnd,&T);
Ellipse(hDC,T.x-20,T.y-20,T.x+20,T.y+20);
//ScreenToWindow(hWnd,&T);

//hBrush=(HBRUSH)GetStockObject(HOLLOW_BRUSH);
//SelectObject(hDC,hBrush);
//Pie(hDC,250,50,300,100,250,50,300,50);
Tt.x=T.x;
Tt.y=T.y;
if(T.x<T0.x)
T.x--;
else
T.x++;
if(T.y<T0.y)
T.y--;
else
T.y++;
if((T.x>1003)||(T.x<21))
{
if(T.x>1003)
T.x=T.x-3;
else
T.x=T.x+3;
}
if((T.y>520)||(T.y<21))
{
if(T.y>520)
T.y=T.y-3;
else
T.y=T.y+3;
}
T0.x=Tt.x;
T0.y=Tt.y;
Sleep(1);

InvalidateRect(hWnd,NULL,true);
EndPaint(hWnd,&PtStr);
DeleteObject(hPen);
DeleteObject(hBrush);
return 0;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default:
return(DefWindowProc(hWnd,iMessage,wParam,lParam));
}

}
BOOL InitWindows(HINSTANCE hInstance,int nCmdShow)
{
HWND hWnd;
hWnd=CreateWindow(
"WinFill",
"tianchongshili",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
0,
CW_USEDEFAULT,
0,
NULL,
NULL,
hInstance,
NULL);
if(!hWnd)
return FALSE;
ShowWindow(hWnd,nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
BOOL InitWindowsClass(HINSTANCE hInstance)
{
WNDCLASS WndClass;
WndClass.cbClsExtra=0;
WndClass.cbWndExtra=0;
WndClass.hbrBackground=(HBRUSH)(GetStockObject(WHITE_BRUSH));
WndClass.hCursor=LoadCursor(NULL,IDC_ARROW);
WndClass.hIcon=LoadIcon(NULL,"END");
WndClass.hInstance=hInstance;
WndClass.lpfnWndProc=WndProc;
WndClass.lpszClassName="WinFill";
WndClass.lpszMenuName=NULL;
WndClass.style=CS_HREDRAW|CS_VREDRAW;
return RegisterClass(&WndClass);
}



我想让圆形随着我的用户去变化而变化，怎么修改，我找了，getclientrect相关的，但总是失败，所以发帖

[解决办法]
没看懂，看问题好像是在外面写个函数接受参数来改变圆

把参数定义为全局变量，如果鼠标滚动就提取滚动值经过计算并赋值给函数参数，再发送paint消息，让paint重新画圆

不过我也不知道，怎么得到鼠标的滚动值，也不知道滚动值和函数参数的函数关系是什么样子的