#include "myWin.h"
#include "math.h"
int cTab[8]=
	{0xFF7777,0x770000, 0xFF3333, 0x77FF77,
	 0x007700,0xFF0000, 0x0033FF, 0x0000FF};
double PI=3.1415926535897932385;
static HDC hBuff; static HBITMAP hBM;
static int M=3;
void drawCircle(HDC hdc,double X0, double Y0, double R, int N){
	int NN= N % 8;
	if(R<0.5){
		SetPixel(hdc,(int)X0, (int)Y0,cTab[NN])  ;return;
	}
	double DTH=PI/M, RR=R*sin(DTH)/(sin(DTH)+1), RX=R-RR;
	double TH=0, DT=2*PI/M; int NC = NN+2;
	for(int i=0;i<M; i++, TH+=DT)
		drawCircle(hdc,X0+RX*cos(TH), Y0+RX*sin(TH), RR,NC+3);
	drawCircle(hdc,X0, Y0, RX-RR,NC);
}
void procPaint(HWND hw, WPARAM wp,LPARAM lp){
	PAINTSTRUCT ps;	HDC hdc=BeginPaint(hw, &ps);
	BitBlt(hdc, 0,0,700,700,hBuff,0,0,SRCCOPY);
	EndPaint(hw,&ps);
}
void procLButtonDown(HWND hw, WPARAM wp,LPARAM lp){
	SelectObject(hBuff,CreateSolidBrush(0xFF));
	HBRUSH hbrush=CreateSolidBrush(0xFFFFFF)  ;
	SelectObject(hBuff,hbrush);
	HRGN hrg=CreateRectRgn(0,0,700,700);
	PaintRgn(hBuff,hrg);
	DeleteObject(hrg);
	DeleteObject(hbrush);
	drawCircle(hBuff,320,320,300, 0);
	InvalidateRect(hw,NULL,TRUE);
}
void procCreate(HWND hw, WPARAM wp,LPARAM lp){
	SetWindowText(hw,TEXT("•½–Ê�[“U‚»‚Ì‚Q"));
	MoveWindow(hw,0,0,700,700,TRUE);
	HDC hdc=GetDC(hw); hBM=CreateCompatibleBitmap(hdc,700,700);
	hBuff=CreateCompatibleDC(hdc); SelectObject(hBuff,hBM);
	SelectObject(hBuff,GetStockObject(NULL_PEN));
	PatBlt(hBuff,0, 0,700,700,WHITENESS);
	ReleaseDC(hw,hdc);
	SetTimer(hw,1,2000,NULL);
	procLButtonDown(hw, wp,lp);
}
void procTimer(HWND hw, WPARAM wp,LPARAM lp){
	M = M + 1; if(M>9) M=3;
	procLButtonDown(hw,wp,lp);
}
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_PAINT         : procPaint(hw,wp,lp)        ; return 0;
	case WM_TIMER         : procTimer(hw,wp,lp)        ; return 0;
	case WM_LBUTTONDOWN   : procLButtonDown(hw,wp,lp)  ; return 0;
	}
	return DefWindowProc(hw,msg,wp,lp);
}