[핵심 API로 배우는 윈도우프로그래밍(강경우, 한빛아카데미)] 3장 10번 풀이(미완성)

#include <Windows.h>
#include<tchar.h>
#include<string.h>
#include<math.h>
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam);
 
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpszCmdLine, int nCmdShow)
{
    HWND hwnd;
    MSG msg;
 
    WNDCLASS WndClass;
    WndClass.style = CS_HREDRAW | CS_VREDRAW;
    WndClass.lpfnWndProc = WndProc;
    WndClass.cbClsExtra = 0;
    WndClass.cbWndExtra = 0;
    WndClass.hInstance = hInstance;
    WndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    WndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
    WndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
    WndClass.lpszMenuName = NULL;
    WndClass.lpszClassName = _T("Window Class Name");
 
    RegisterClass(&WndClass); //윈도우 클래스를 커널에 등록
 
    hwnd = CreateWindow( //윈도우 핸들값 반환
        _T("Window Class Name"), //윈도우 클래스 이름
        _T("홍길동의 첫 번째 윈도우"), //윈도우 타이틀이름
        WS_OVERLAPPEDWINDOW, //윈도우 스타일
        100, //윈도우 위치 x좌표
        100,//윈도우 위치 y좌표
        1000, //윈도우 가로크기
        1000, //윈도우 세로크기
        NULL, //부모 윈도우핸들
        NULL, //메뉴핸들
        hInstance, //응용프로그램 인스턴스
        NULL); //생성 윈도우 정보
 
    ShowWindow(hwnd, nCmdShow);
    UpdateWindow(hwnd);
 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
    return (int)msg.wParam;
}
 
LRESULT CALLBACK WndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    static int headX = 60, headY = 20;
    static int tailX[11], tailY[11];
    static int tailCount = 0;
    static bool isGoing = false;
    static int Direction = 1;
 
    HPEN blackPen, redPen, bluePen;
    HBRUSH blackBrush, whiteBrush;
    static int foodX[10], foodY[10];
 
    switch (iMsg)
    {
    case WM_CREATE:
        tailX[0] = 20, tailY[0] = 20;
        for (int i = 0; i < 10; i++)
        {
            foodX[i] = ((rand() % 15) * 40) + 20; //20~560
            foodY[i] = ((rand() % 15) * 40) + 20; //20~560
        }
        break;
 
    case WM_KEYDOWN:
        if (wParam == VK_RIGHT && (tailX[0] + 60) <= 600) //오른쪽키
        {
            headX = tailX[0] + 40;
            headY = tailY[0];
            Direction = 1;
        }
        else if (wParam == VK_LEFT && (tailX[0] - 60) >= 0) //왼쪽키
        {
            headX = tailX[0] - 40;
            headY = tailY[0];
            Direction = 3;
        }
        else if (wParam == VK_UP && (tailY[0] - 60) >= 0) //위쪽키
        {
            headX = tailX[0];
            headY = tailY[0] - 40;
            Direction = 4;
        }
        else if (wParam == VK_DOWN && (tailY[0] + 60) <= 600) //아래키
        {
            headX = tailX[0];
            headY = tailY[0] + 40;
            Direction = 2;
        }
        if (wParam == VK_RETURN)
        {
            if (isGoing) isGoing = false;
            else isGoing = true;
 
            if (isGoing)
                SetTimer(hwnd, 1, 700, NULL);
            else
                KillTimer(hwnd, 1);
            InvalidateRgn(hwnd, NULL, TRUE);
            break;
        }
        InvalidateRgn(hwnd, NULL, TRUE);
        break;
 
    case WM_TIMER:
        if (Direction == 1 && (headX + 20) < 600) //오른
        {
            headX += 40;
            tailX[0] = headX - 40;
        }
        else if (Direction == 3 && (headX - 20) > 0) //왼
        {
            headX -= 40;
            tailX[0] = headX + 40;
        }
        else if (Direction == 4 && (headY - 20) > 0) //위
        {
            headY -= 40;
            tailY[0] = headY + 40;
        }
        else if (Direction == 2 && (headY + 20) < 600) //아래
        {
            headY += 40;
            tailY[0] = headY - 40;
        }
        for (int i = 0; i < 10; i++) //먹이 먹으면
        {
            if (headX == foodX[i] && headY == foodY[i])
            {
                foodX[i] = foodY[i] = -10;
                tailCount++;
                if (Direction == 1)
                {
                    tailX[tailCount] = tailX[tailCount - 1] - 40;
                    tailY[tailCount] = tailY[tailCount - 1];
                }
                else if (Direction == 2)
                {
                    tailX[tailCount] = tailX[tailCount - 1];
                    tailY[tailCount] = tailY[tailCount - 1] - 40;
                }
                else if (Direction == 3)
                {
                    tailX[tailCount] = tailX[tailCount - 1] + 40;
                    tailY[tailCount] = tailY[tailCount - 1];
                }
                else if (Direction == 4)
                {
                    tailX[tailCount] = tailX[tailCount - 1];
                    tailY[tailCount] = tailY[tailCount - 1] + 40;
                }
            }
        }
        
        InvalidateRgn(hwnd, NULL, TRUE);
        break;
 
    case WM_PAINT:
        hdc = BeginPaint(hwnd, &ps);
        Rectangle(hdc, 0, 0, 600, 600);
 
        blackPen = CreatePen(PS_SOLID, 1, RGB(0, 0, 0));
        whiteBrush = CreateSolidBrush(RGB(255, 255, 255));
        blackBrush = CreateSolidBrush(BLACK_BRUSH);
        bluePen = CreatePen(PS_SOLID, 1, RGB(0, 0, 255));
        redPen = CreatePen(PS_SOLID, 1, RGB(255, 0, 0));
 
        SelectObject(hdc, blackPen);
        SelectObject(hdc, blackBrush);
        for (int i = 0; i < 10; i++)
        {
            Ellipse(hdc, foodX[i] - 20, foodY[i] - 20, foodX[i] + 20, foodY[i] + 20); //먹이
        }
 
        SelectObject(hdc, redPen);
        SelectObject(hdc, whiteBrush);
        Ellipse(hdc, headX - 20, headY - 20, headX + 20, headY + 20); //머리
 
        SelectObject(hdc, bluePen);
        for (int i = 0; i <= tailCount; i++)
            Ellipse(hdc, tailX[i] - 20, tailY[i] - 20, tailX[i] + 20, tailY[i] + 20); //꼬리
 
        DeleteObject(blackBrush);
        DeleteObject(whiteBrush);
        DeleteObject(blackPen);
        DeleteObject(redPen);
        DeleteObject(bluePen);
        EndPaint(hwnd, &ps);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
 
    }
    return DefWindowProc(hwnd, iMsg, wParam, lParam);
}