// gdiplus01.cpp  2013.02.07 by Hatada
//
// Load image from file.

#define WINVER          0x0501      // 0x0501 = WindowsXP
#define _WIN32_WINNT    0x0501

#include <windows.h>
#include <gdiplus.h>
using namespace Gdiplus;

#pragma comment(lib, "user32.lib")
#pragma comment(lib, "gdiplus.lib")

#define SCRW 512
#define SCRH 512

#define TM_COUNT1 1
#define FPS    60

LRESULT CALLBACK WndProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
  HDC hdc;
  PAINTSTRUCT ps;
  static Image *img;
  static Image *bg;
  static Graphics *g;
  RECT rect;

  static float x, y, dx, dy;
  static int wdw_w, wdw_h;

  switch (uMsg)
    {
      case WM_CREATE:
        // get window size
        GetClientRect(hWnd, &rect);
        wdw_w = rect.right - rect.left;
        wdw_h = rect.bottom - rect.top;

        img = new Image(L"test.png");
        bg = new Image(L"bg.png");

        // int work
        x = (float)(wdw_w / 2);
        y = (float)(wdw_h / 2);
        dx = (float) wdw_w / (float)FPS;
        dy = dx * 0.7;

        SetTimer(hWnd, TM_COUNT1, (int)(1000 / FPS), NULL);
        break;

      case WM_TIMER:
        // main loop
        x += dx;
        y += dy;

        if (x <= 0 || x + img->GetWidth() >= wdw_w) dx *= -1;

        if (y <= 0 || y + img->GetHeight() >= wdw_h) dy *= -1;

        InvalidateRect(hWnd, NULL, TRUE);
        // InvalidateRect(hWnd, NULL, FALSE);
        break;

      case WM_PAINT:
        hdc = BeginPaint(hWnd, &ps);
        g = new Graphics(hdc);

        g->DrawImage(bg, 0, 0, bg->GetWidth(), bg->GetHeight());
        g->DrawImage(img, (int)x, (int)y, img->GetWidth(), img->GetHeight());

        delete (g);
        EndPaint(hWnd, &ps);
        break;

      case WM_DESTROY:
        delete (img);
        delete (bg);

        PostQuitMessage(0);
        break;

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

  return 0;
}

int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrevInst, LPSTR lpCmdLine, int nCmdShow)
{
  MSG msg;
  GdiplusStartupInput gpSI;
  ULONG_PTR lpToken;

  /* GDI+������ */
  GdiplusStartup(&lpToken, &gpSI, NULL);

  HCURSOR hCursor = LoadCursor(NULL, IDC_ARROW);
  HBRUSH hBrush = (HBRUSH)(COLOR_WINDOW + 1);
  WNDCLASS wcl = { 0, WndProc, 0, 0, hInst, NULL, hCursor, hBrush, NULL, "mh" };
  DWORD style = WS_OVERLAPPEDWINDOW | WS_VISIBLE;

  if (!RegisterClass(&wcl) ||
      !CreateWindowEx(0, "mh", "gdiplus test",
                      style,
                      CW_USEDEFAULT, CW_USEDEFAULT,
                      SCRW, SCRH,
                      NULL, NULL, hInst, NULL))
    return FALSE;

  while (GetMessage(&msg, NULL, 0, 0) > 0)
    {
      TranslateMessage(&msg);
      DispatchMessage(&msg);
    }

  /* GDI+�I�� */
  GdiplusShutdown(lpToken);

  return msg.wParam;
}