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本篇《Windows界面编程第十一篇位图显示特效随机积木效果》将讲解位图的随机积木显示效果。

 

      在程序设计上，随机积木效果是最简单的啦，只要一格一格的显示出整个位置即可：

// 随机积木
//《Windows界面编程第十一篇 位图显示特效 随机积木效果》
//javascript:void(0)
void AnimateDraw_RandomBlocks(HDC hdc, HDC hdcMem, int nWidth, int nHeight, UINT nIntervalTime = 15,
                int nRowBlocks = 10, int nColBlocks = 10)
{
  int nStepRow, nStepCol, nDisplayCount;
  int nSumBlocks = nRowBlocks * nColBlocks;
  bool *pFlagArray = new bool[nSumBlocks];
  memset(pFlagArray, 0, sizeof(bool) * nSumBlocks);

  nStepRow = nWidth / nRowBlocks;
  nStepCol = nHeight / nColBlocks;
  srand((unsigned)time(NULL));
  nDisplayCount = 0; //已显示方格个数
  while (true) 
  { 
    int row = rand() % nRowBlocks; 
    int col = rand() % nColBlocks; 
    if (pFlagArray[row * nColBlocks + col]) 
      continue;
    pFlagArray[row * nColBlocks + col] = true;

    BitBlt(hdc, row * nStepRow, col * nStepCol, nStepRow, nStepCol, 
      hdcMem, row * nStepRow, col * nStepCol, SRCCOPY);
    nDisplayCount++;
    if (nDisplayCount >= nSumBlocks)
      break;
    Sleep(nIntervalTime); 
  }
  BitBlt(hdc, 0, 0, nWidth, nHeight, hdcMem, 0, 0, SRCCOPY);
}


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