#include "myWin.h"
float mu=-1, a=0.008F, b=0.05F,dm= 0.0005F;
void procCreate(HWND hw, WPARAM wp, LPARAM lp){
	SetTimer(hw, 1, 10, NULL);
}
void procTimer(HWND hw, WPARAM wp, LPARAM lp){
	mu=mu+dm;if(mu>1.0)mu=-1;
	InvalidateRect(hw, NULL, TRUE);
}
void procPaint(HWND hw, WPARAM wp, LPARAM lp){
	PAINTSTRUCT ps;
	HDC hdc=BeginPaint(hw, &ps);
	float X=0.1F,Y=0.0F, G;
	G = mu * X + 2.F * (1.F - mu) * X * X / (1.F + X * X);
	for(int i=0;i<10000;i++){
		int XP = (int)(500.F - X * 10.F), YP=(int)(200.F - Y * 10.F);
		float XN = X;
		SetPixel(hdc,XP,YP,0x007700);
		X = Y + a * (1 - b * Y * Y) * Y + G;
		G = mu * X + 2.F * (1.F - mu) * X * X / (1.F + X * X);
		Y = -XN + G;
	}
}
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);
}