/* Window Procedure : To treat messages which was sent from OS to msgQue ! */
/* MAKE WINDOW ウィンドウを表示させる */

#include<windows.h>
#define MYWNDCLASS "MYWNDCLASS"
#define CAPTION "Drowing"
#define WIDTH 320
#define HEIGHT 320

#define R     0xFF
#define G   0xFF00
#define B 0xFF0000

#define PI 3.141593

/* MAKE GRAPHICS 描画操作の基本形 */
LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	HDC hdc;
	PAINTSTRUCT ps;

	int x, y;

	switch(uMsg){
	case WM_PAINT:
		hdc=BeginPaint(hWnd, &ps);		/* 描画開始 */

		for (y = 0; y < HEIGHT; y += 5) {
			for (x = 0; x < WIDTH; x++) {
				SetPixel(hdc, x, y, R | G | B);
			}
		}

		MoveToEx(hdc , 10 , 10 , NULL);
		LineTo(hdc , 110 , 10);
		LineTo(hdc , 110 , 110);

		EndPaint(hWnd, &ps);			/* 描画終了 */
		break;

	case WM_DESTROY:
		PostQuitMessage(0); /* To post message to end for OS! */
		break;

	default:
		return DefWindowProc(hWnd, uMsg, wParam, lParam);
	}
	return 0;
}

int WINAPI WinMain(
	HINSTANCE hInstance,
	HINSTANCE hPrevInstance,
	LPSTR lpCmdLine,
	int nCmdShow
	)

{
	MSG msg;
	WNDCLASSEX wc;
	HWND hWnd;
	WNDCLASS winc;

/*	winc.style			= CS_HREDRAW | CS_VREDRAW;
	winc.lpfnWndProc		= WndProc;
	winc.cbClsExtra		= winc.cbWndExtra	= 0;
	winc.hInstance		= hInstance;
	winc.hIcon		= LoadIcon(NULL , IDI_APPLICATION);
	winc.hCursor		= LoadCursor(NULL , IDC_ARROW);
	winc.hbrBackground	= (HBRUSH)GetStockObject(WHITE_BRUSH);
	winc.lpszMenuName	= NULL;
	winc.lpszClassName	= TEXT("GRPH");
*/
	ZeroMemory(&wc, sizeof(wc));	/* ウィンドウクラス構造体の初期化 */
	wc.cbSize	= sizeof(WNDCLASSEX);
	wc.lpfnWndProc	= (WNDPROC)WndProc;
	wc.hInstance	= hInstance;
	wc.hCursor	= LoadCursor(NULL, MAKEINTRESOURCE(IDC_ARROW));
	wc.hbrBackground	= GetStockObject(BLACK_BRUSH);
	wc.lpszClassName	= MYWNDCLASS;
	RegisterClassEx(&wc);		/* To regist "Window Class" to OS ウィンドウクラスを OS に登録 */

	hWnd = CreateWindowEx(0,	/* Make Window ウィンドウクラス インスタンス生成 */
		MYWNDCLASS,
		CAPTION,
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT, CW_USEDEFAULT,
		WIDTH, HEIGHT,
		NULL,
		NULL,
		hInstance,
		NULL);
	/* Draw Window */
	ShowWindow(hWnd, nCmdShow);
	UpdateWindow(hWnd);

	/* Mesage loup :ウィンドウアプリケーションは無限ループでスレッドを維持。GetMessageの返り値が "0" で終了 */
	while (GetMessage(&msg, NULL, 0, 0)){	/* GetMessage 関数でメッセージキューからメッセージを取得 */
		TranslateMessage(&msg);
		DispatchMessage(&msg);	/* WndProc(50行目以降)へディスパッチ */
	}

	return msg.wParam;

}