* @return a new shape id.
*/
public int allocateShapeId(short drawingGroupId)
{
// Get the last shape id for this drawing group.
EscherDgRecord dg = (EscherDgRecord) dgMap.get(new Short(drawingGroupId));
int lastShapeId = dg.getLastMSOSPID();
// Have we run out of shapes for this cluster?
int newShapeId = 0;
if (lastShapeId % 1024 == 1023)
{
// Yes:
// Find the starting shape id of the next free cluster
newShapeId = findFreeSPIDBlock();
// Create a new cluster in the dgg record.
dgg.addCluster(drawingGroupId, 1);
}
else
{
// No:
// Find the cluster for this drawing group with free space.
for (int i = 0; i < dgg.getFileIdClusters().length; i++)
{
EscherDggRecord.FileIdCluster c = dgg.getFileIdClusters()[i];
if (c.getDrawingGroupId() == drawingGroupId)
{
if (c.getNumShapeIdsUsed() != 1024)
{
// Increment the number of shapes used for this cluster.
c.incrementShapeId();
}
}
// If the last shape id = -1 then we know to find a free block;
if (dg.getLastMSOSPID() == -1)
{
newShapeId = findFreeSPIDBlock();
}
else
{
// The new shape id to be the last shapeid of this cluster + 1
newShapeId = dg.getLastMSOSPID() + 1;
}
}
}
// Increment the total number of shapes used in the dgg.
dgg.setNumShapesSaved(dgg.getNumShapesSaved() + 1);
// Is the new shape id >= max shape id for dgg?
if (newShapeId >= dgg.getShapeIdMax())
{
// Yes:
// Set the max shape id = new shape id + 1
dgg.setShapeIdMax(newShapeId + 1);
}
// Set last shape id for this drawing group.
dg.setLastMSOSPID(newShapeId);
// Increased the number of shapes used for this drawing group.
dg.incrementShapeCount();
return newShapeId;
}