DemHeader.iDemX = set.m_nXPoint; // 填充文件头
DemHeader.iDemY = set.m_nYPoint;
DemHeader.interval = set.m_nInterval;
// 选择待生成的DEM文件
CFileDialog fileDlg(FALSE, "*.dem", "*.dem", OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, "地形数据文件(*.dem)|*.dem||", NULL);
if (fileDlg.DoModal() == IDOK) {
// 申请DEM数据缓冲区
int* pData = new int[set.m_nWidthBytes * set.m_nYPoint + 100];
if (set.m_bUseRandom == FALSE) {
BYTE R, G, B; // 24位图象将真彩数据转换为灰度数据保存
for (int i = 0; i < set.m_nYPoint; i++) {
for (int j = 0; j < set.m_nXPoint; j++) {
B = set.m_pData[i * set.m_nWidthBytes + j * 3];
G = set.m_pData[i * set.m_nWidthBytes + j * 3 + 1];
R = set.m_pData[i * set.m_nWidthBytes + j * 3 + 2];
pData[i * DemHeader.iDemX + j] = (int)((9798.0f * R + 19235.0f * G + 3735.0f * B) / 32768.0f);
}
}
}else{
for (int i = 0; i < set.m_nXPoint * set.m_nYPoint; i++) // 用随机数填充DEM数据
pData[i] = (int)(rand() % set.m_nLimit);
}
CFile file; // 保存DEM数据到文件
file.Open(fileDlg.GetPathName(), CFile::modeCreate | CFile::modeReadWrite);
if (pData != NULL) {
file.Write((LPSTR)&DemHeader, sizeof(DemHeader));
file.WriteHuge((LPSTR)pData, DemHeader.iDemX * DemHeader.iDemY * sizeof(int));
}
file.Close();
delete[] pData;
} |
