#include "myWin.h"
static BOOL moveRight=TRUE; static int X=0, dX=5;
void procCreate(HWND hw, WPARAM wp,LPARAM lp){
	SetTimer(hw,1,10,NULL);
}
void procTimer(HWND hw, WPARAM wp,LPARAM lp){
	RECT rctD; GetClientRect(hw,&rctD);
	if     (X+50>=rctD.right) moveRight=FALSE;
	else if(X<=0)             moveRight=TRUE;
	if(moveRight) X +=dX; else X -= dX;
	InvalidateRect(hw,NULL,TRUE);
}
void procPaint(HWND hw, WPARAM wp,LPARAM lp){
	PAINTSTRUCT ps;
	HDC hdc=BeginPaint(hw,&ps);
	SelectObject(hdc, GetStockObject(BLACK_BRUSH));
	Ellipse(hdc,X,50,X+50,100);
	EndPaint(hw,&ps);
}
LRESULT CALLBACK WndProc (HWND hw, UINT msg, WPARAM wp,LPARAM lp){
	switch(msg){
	case WM_DESTROY : PostQuitMessage(0)  ; return 0;
	case WM_CREATE  : procCreate(hw,wp,lp); return 0;
	case WM_TIMER   : procTimer (hw,wp,lp); return 0;
	case WM_PAINT   : procPaint (hw,wp,lp); return 0;
	}
	return DefWindowProc(hw,msg,wp,lp);
}