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WM_PAINT로 다시 그리는 기능을 구현

#define MAX_COUNT 1000

int g_is_clicked = 0;
int g_x[MAX_COUNT] = { 0, }, g_y[MAX_COUNT] = { 0, };
int g_count = 0;

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	if (uMsg == WM_DESTROY) PostQuitMessage(0);
	else if (uMsg == WM_PAINT) {
		PAINTSTRUCT ps;
		HDC h_dc = BeginPaint(hWnd, &ps);

		if(g_count > 0)	MoveToEx(h_dc, g_x[0], g_y[0], NULL);		// MoveTo의 중복호출을 막는다.
		for (int i = 1; i < g_count; i++) {
			LineTo(h_dc, g_x[i], g_y[i]);
		}

		EndPaint(hWnd, &ps);
		return 0;
	}
	else if (uMsg == WM_LBUTTONDOWN) {
		g_is_clicked = 1;
		g_x[g_count] = GET_X_LPARAM(lParam);//
		g_y[g_count] = GET_Y_LPARAM(lParam);
		g_count++;

	}
	else if (uMsg == WM_LBUTTONUP) {
		g_is_clicked = 0;
	}
	else if (uMsg == WM_MOUSEMOVE) {
		if (g_is_clicked == 1 && g_count <= MAX_COUNT) {

			HDC h_dc = GetDC(hWnd);

			MoveToEx(h_dc, g_x[g_count-1], g_y[g_count-1], NULL);
			g_x[g_count] = GET_X_LPARAM(lParam);//
			g_y[g_count] = GET_Y_LPARAM(lParam);
			LineTo(h_dc, g_x[g_count], g_y[g_count]);
			g_count++;


			ReleaseDC(hWnd, h_dc);
		}
	}

	return DefWindowProc(hWnd, uMsg, wParam, lParam);
}