// ■4カラー画像をミックスして格子縞を動かす
#include "myWin.h"
#include "math.h"
static HDC hBuff[5]; //ビットマップ描画用
static HBITMAP hBM[5];//ビットマップ描画用
int Xstart=12, Ystart=12, DX=-1,DY=-1, md=0;
void genImage(){
	COLORREF C;
	for(int i=0;i<300;i++)for(int j=0;j<300;j++){
		if(i%2){
			if(j % 2) C=GetPixel(hBuff[1],i,j);
			else      C=GetPixel(hBuff[2],i,j);
		}
		else{
			if(j % 2) C=GetPixel(hBuff[3],i,j);
			else      C=GetPixel(hBuff[4],i,j);
		}
		SetPixel(hBuff[0],i,j,C);
	}
}
void procCreate(HWND hw, WPARAM wp, LPARAM lp){
	TCHAR str[32];
	MoveWindow(hw, 0,0,360,360,TRUE);
	HDC hdc=GetDC(hw);
	hBM[0]=CreateCompatibleBitmap(hdc,300,300);
	hBuff[0]=CreateCompatibleDC(hdc);SelectObject(hBuff[0],hBM[0]);
	SelectObject(hBuff[0], GetStockObject(NULL_PEN));
	PatBlt(hBuff[0], 0,0,300,300,WHITENESS);
	for(int i=1;i<5;i++){
		wsprintf(str,TEXT("pict%d"),i);
		hBM[i]=LoadBitmap(hInstance,str);
		hBuff[i]=CreateCompatibleDC(hdc);SelectObject(hBuff[i],hBM[i]);
	}
	ReleaseDC(hw, hdc);
	SetTimer(hw,1,300,NULL);
	genImage();
	InvalidateRect(hw,NULL,TRUE);
}
void drawLine(int X1, int Y1, int Y);
void procNext(){
	md=1-md;
	if(md){
		if(Xstart>14)DX=-1;	else if(Xstart<6) DX=1;
		Xstart+=DX;
	}else{
		if(Ystart>14)DY=-1;	else if(Ystart<6) DY=1;
		Ystart+=DX;
	}
}
void procLButtonDown(HWND hw, WPARAM wp, LPARAM lp){
	 procNext();	InvalidateRect(hw,NULL,TRUE);
}
void procRButtonDown(HWND hw, WPARAM wp, LPARAM lp){
	KillTimer(hw,1);
	Xstart-=DX;	InvalidateRect(hw,NULL,TRUE);
}
void procTimer(HWND hw, WPARAM wp, LPARAM lp){
	 procNext();
	InvalidateRect(hw,NULL,TRUE);
}
void procPaint(HWND hw, WPARAM wp, LPARAM lp){//ビットマップを画面に表示
	PAINTSTRUCT ps; 
	HDC hdc=BeginPaint(hw, &ps);
	BitBlt(hdc,10,10,600,300,hBuff[0],0,0,SRCCOPY);
	
	HPEN pen=CreatePen(PS_SOLID,1,0x00); SelectObject(hdc,pen);
	for(int i=0;i<300;i+=2) {
		MoveToEx(hdc,Xstart+i,Ystart,NULL);
		LineTo(hdc,Xstart+i,Ystart+300);
		MoveToEx(hdc,Xstart,Ystart+i,NULL);
		LineTo(hdc,Xstart+300,Ystart+i);
	}
	DeleteObject(pen);
	EndPaint(hw,&ps);
}
LRESULT CALLBACK WndProc(HWND hw, UINT msg, WPARAM wp, LPARAM lp){
	switch(msg){
	case WM_DESTROY : 
		for(int i=0;i<5;i++){DeleteDC(hBuff[i]); DeleteObject(hBM[i]);}
		PostQuitMessage(0)    ; return 0;
	case WM_CREATE  : procCreate (hw, wp, lp); return 0;
	case WM_LBUTTONDOWN  : procLButtonDown (hw, wp, lp); return 0;
	case WM_RBUTTONDOWN  : procRButtonDown (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);
}