trippy.cpp

《24小时教会你游戏编程》上的源码

//-----------------------------------------------------------------
// Trippy Application
// C++ Source - Trippy.cpp
//-----------------------------------------------------------------

//-----------------------------------------------------------------
// Include Files
//-----------------------------------------------------------------
#include "Trippy.h"

//-----------------------------------------------------------------
// Game Engine Functions
//-----------------------------------------------------------------
BOOL GameInitialize(HINSTANCE hInstance)
{
  // Create the game engine
  _pGame = new GameEngine(hInstance, TEXT("Trippy"),
    TEXT("Trippy"), IDI_TRIPPY, IDI_TRIPPY_SM);
  if (_pGame == NULL)
    return FALSE;
  
  // Set the frame rate
  _pGame->SetFrameRate(15);

  return TRUE;
}

void GameStart(HWND hWindow)
{
  // Seed the random number generator
  srand(GetTickCount());

  // Set the position and size of the initial rectangle
  _rcRectangle.left = _pGame->GetWidth() * 2 / 5;
  _rcRectangle.top = _pGame->GetHeight() * 2 / 5;
  _rcRectangle.right = _rcRectangle.left + _pGame->GetWidth() / 5;
  _rcRectangle.bottom = _rcRectangle.top + _pGame->GetHeight() / 5;
}

void GameEnd()
{
  // Cleanup the game engine
  delete _pGame;
}

void GameActivate(HWND hWindow)
{
}

void GameDeactivate(HWND hWindow)
{
}

void GamePaint(HDC hDC)
{
  // Draw grid lines as a background for the rectangles
  const int iGridLines = 50;
  for (int i = 1; i <= iGridLines; i++)
  {
    // Draw a horizontal grid line
    MoveToEx(hDC, _pGame->GetWidth() * i / iGridLines , 0, NULL);
    LineTo(hDC, _pGame->GetWidth() * i / iGridLines, _pGame->GetHeight());

    // Draw a vertical grid line
    MoveToEx(hDC, 0, _pGame->GetHeight() * i / iGridLines, NULL);
    LineTo(hDC, _pGame->GetWidth(), _pGame->GetHeight() * i / iGridLines);
  }
}

void GameCycle()
{
  HDC         hDC;
  HWND        hWindow = _pGame->GetWindow();
  HBRUSH      hBrush;

  // Randomly alter the position and size of the rectangle
  int iInflation = (rand() % 21) - 10;
  InflateRect(&_rcRectangle, iInflation, iInflation);
  OffsetRect(&_rcRectangle, (rand() % 19) - 9, (rand() % 19) - 9);

  // Draw the new rectangle in a random color
  hBrush = CreateSolidBrush(RGB(rand() % 256, rand() % 256, rand() % 256));
  hDC = GetDC(hWindow);
  FillRect(hDC, &_rcRectangle, hBrush);
  ReleaseDC(hWindow, hDC);
  DeleteObject(hBrush);
}