--Saving an OFF file--

The following partial implementation of the Serialize method is one
way to handle saving an OFF file, with the amount of detail
we need. It writes a basic OFF file.

This assumes that your data is stored in the following way:
int numVertices		// The number of vertices in the mesh
int numFaces		// The number of faces in the mesh
int numEdges		// The number of edges in the mesh (If known. Otherwise, 0 works)
double** vertices	// A dynamically allocated 2D array of doubles, with numVertices rows
			// and 3 columns (x, y, z).
int* faceSizes		// A dynamically allocated array of ints, where each entry is the size
			// of the corresponding face (# of edges/vertices in it)
int** faces		// A dynamically allocated 2D array of ints, with numFaces rows
			// and as many columns per row as the corresponding faceSizes entry.
Use the information above to translate this code to work on your
own data structures.


void <yourprojectname>Doc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// If the user hit Save or Save As, this block is executed
		// instead of the one below.

		// Write out the first line of the file header
		ar.WriteString("OFF\n");

		// Create a CString to format strings into
		CString writeLine;
		// Write the header information into the string, using the printf-like
		// Format method.
		writeLine.Format("%d %d %d\n", numVertices, numFaces, numEdges);
		// Write out the second line of the file header.
		ar.WriteString(writeLine);
		
		// Write out all the vertices in order.
		for (int i = 0;i < numVertices;i++) {
			writeLine.Format("%f %f %f", vertices[i][0], vertices[i][1], vertices[i][2]);
			ar.WriteString(writeLine);
			ar.WriteString("\n");
		}

		int currentFaceSize = 0;
		for (i = 0;i < numFaces;i++) {
			currentFaceSize = faceSizes[i];
			writeLine.Format("%d", currentFaceSize);
			ar.WriteString(writeLine);
			for (int j = 0;j < currentFaceSize; j++) {
				writeLine.Format(" %d", faces[i][j]);
				ar.WriteString(writeLine);
			}
			ar.WriteString("\n");
		}
	}
	else
	{
		// This is where the loading code is.
	}
}

Ryan Holmes 4/5/02