#include "myWin.h"
#define BITX 500
#define BITY 500
static HDC hbuf; static HBITMAP hBM;
void initBitMap(HWND hw){
	HDC hdc=GetDC(hw); hBM=CreateCompatibleBitmap(hdc,BITX,BITY);
	hbuf=CreateCompatibleDC(hdc);SelectObject(hbuf,hBM);
	SelectObject(hbuf,GetStockObject(NULL_PEN));
	ReleaseDC(hw, hdc);
}
void clearBitmap(){
	PatBlt(hbuf,0,0,BITX,BITY,BLACKNESS);
}
double a, XS;
void initData(){a=2.9;XS=0.1;}
//全体表示用
double SCX=300, SCY=200, X0=800, Y0=300, da=0.00001;
//2倍表示用
//double SCX=600, SCY=400, X0=1900, Y0=450, da=0.00001;
//4倍表示用
//double SCX=1200, SCY=800, X0=4200, Y0=800, da=0.000001;
//6倍表示用
//double SCX=1800, SCY=1200, X0=6200, Y0=1100, da=0.000001;
//8倍表示用
//double SCX=2400, SCY=1600, X0=8400, Y0=1500, da=0.000001;
int intX(double X) {return (int)(X * SCX -X0);}
int intY(double X) {return (int)(Y0 - X * SCY);}
void cmpIter(){
	clearBitmap();
	double X= XS ;
	for(a=2.9;a<4;X = a*(1-X)*X, a+=da)
		SetPixel(hbuf, intX(a), intY(X), 0xFFFFFF);
}
void procLButtonDown(HWND hw, WPARAM wp, LPARAM lp){
	cmpIter();
	InvalidateRect(hw,NULL,FALSE);
}
void procCreate(HWND hw, WPARAM wp, LPARAM lp){
	MoveWindow(hw,0,0,BITX,BITY,NULL);
	SetWindowText(hw,TEXT("Logistic Map"));
	initBitMap(hw);
	initData();
	procLButtonDown(hw,wp,lp);
}
void procPaint(HWND hw, WPARAM wp, LPARAM lp){
	PAINTSTRUCT ps; HDC hdc=BeginPaint(hw, &ps);
	BitBlt(hdc,0,0,BITX,BITY,hbuf,0,0,SRCCOPY);
	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_LBUTTONDOWN  : procLButtonDown(hw,wp,lp)  ; return 0;
	case WM_PAINT   : procPaint (hw, wp, lp); return 0;
	}
	return DefWindowProc(hw, msg, wp, lp);
}