private void WriteGroup(Group group, string ownerHandle)
{
this.chunk.Write(0, group.CodeName);
this.chunk.Write(5, group.Handle);
this.chunk.Write(330, ownerHandle);
this.chunk.Write(100, SubclassMarker.Group);
this.chunk.Write(300, this.EncodeNonAsciiCharacters(group.Description));
this.chunk.Write(70, group.IsUnnamed ? (short) 1 : (short) 0);
this.chunk.Write(71, group.IsSelectable ? (short) 1 : (short) 0);
foreach (EntityObject entity in group.Entities)
{
this.chunk.Write(340, entity.Handle);
}
}
private Group ReadGroup()
{
string handle = null;
string description = null;
string name = null;
bool isUnnamed = true;
bool isSelectable = true;
List<string> entities = new List<string>();
this.chunk.Next();
while (this.chunk.Code != 0)
{
switch (this.chunk.Code)
{
case 5:
handle = this.chunk.ReadHex();
this.chunk.Next();
break;
case 330:
string handleOwner = this.chunk.ReadHex();
DictionaryObject dict = this.dictionaries[handleOwner];
if (handle == null)
throw new NullReferenceException("Null handle in Group dictionary.");
name = dict.Entries[handle];
this.chunk.Next();
break;
case 300:
description = this.DecodeEncodedNonAsciiCharacters(this.chunk.ReadString());
this.chunk.Next();
break;
case 70:
isUnnamed = this.chunk.ReadShort() != 0;
this.chunk.Next();
break;
case 71:
isSelectable = this.chunk.ReadShort() != 0;
this.chunk.Next();
break;
case 340:
string entity = this.chunk.ReadHex();
entities.Add(entity);
this.chunk.Next();
break;
default:
this.chunk.Next();
break;
}
}
// we need to keep track of the group names generated
if (isUnnamed)
this.CheckGroupName(name);
Group group = new Group(name, false)
{
Handle = handle,
Description = description,
IsUnnamed = isUnnamed,
IsSelectable = isSelectable
};
// the group entities will be processed later
this.groupEntities.Add(group, entities);
return group;
}
private static void WriteGroup()
{
Line line1 = new Line(new Vector2(0, 0), new Vector2(100, 100));
Line line2 = new Line(new Vector2(100, 0), new Vector2(200, 100));
Line line3 = new Line(new Vector2(200, 0), new Vector2(300, 100));
// named group
Group group1 = new Group("MyGroup", new EntityObject[] {line1, line2});
//unnamed group
Group group2 = new Group(new EntityObject[] {line1, line3});
DxfDocument dxf = new DxfDocument();
// the AddGroup method will also add the entities contained in a group to the document.
dxf.Groups.Add(group1);
dxf.Groups.Add(group2);
List<DxfObject> list = dxf.Groups.GetReferences(group1);
dxf.Save("group.dxf");
dxf = DxfDocument.Load("group.dxf");
group1 = dxf.Groups[group1.Name];
group2 = dxf.Groups[group2.Name];
dxf.Groups.Remove(group1);
dxf.Groups.Remove(group2);
dxf.Save("group copy.dxf");
}
public static void ModifyingGroups()
{
Line line1 = new Line(new Vector2(0, 0), new Vector2(100, 100));
line1.Color = AciColor.Red;
Line line2 = new Line(new Vector2(100, 0), new Vector2(200, 100));
line2.Color = AciColor.Yellow;
Line line3 = new Line(new Vector2(200, 0), new Vector2(300, 100));
line3.Color = AciColor.Magenta;
DxfDocument doc = new DxfDocument();
Block blk = new Block("MyBlock");
blk.Entities.Add(line1);
Insert ins = new Insert(blk);
doc.AddEntity(ins);
doc.AddEntity(line2);
Layout layout = new Layout("Layout1");
doc.Layouts.Add(layout);
doc.ActiveLayout = layout.Name;
doc.AddEntity(line3);
// group
Group group = new Group("MyGroup");
doc.Groups.Add(group);
// the Add method will also add the entities contained in a group to the document (in the active layout).
doc.Groups.Add(group);
// when the group belongs to a document, all entities must belong to the same document.
// even if it does not sound very useful, a group can contain entities that belongs to different layouts and even blocks.
group.Entities.Add(line1);
group.Entities.Add(line2);
group.Entities.Add(line3);
Line line4 = new Line(new Vector2(300, 0), new Vector2(400, 100));
line4.Color = AciColor.Blue;
// if a new entity, that does not belong to any document, is added to the group, it will be added to the group document active layout.
doc.ActiveLayout = Layout.ModelSpaceName;
group.Entities.Add(line4);
Line line5 = new Line(new Vector2(400, 0), new Vector2(500, 100));
line5.Color = AciColor.Green;
DxfDocument doc2 = new DxfDocument();
doc2.AddEntity(line5);
// this is illegal, line5 belongs to another document.
//group.Entities.Add(line5);
// you need to clone the entity before adding it to the group. This is also the common practice to copy entities between documents.
group.Entities.Add((EntityObject) line5.Clone());
// remember removing a group only deletes it from the collection not the entities
//doc.Groups.Remove(group);
doc.Save("group.dxf");
doc = DxfDocument.Load("group.dxf");
}
private static void MakingGroups()
{
Line line1 = new Line(Vector2.Zero, Vector2.UnitX);
Line line2 = new Line(Vector2.Zero, Vector2.UnitY);
Group group = new Group();
group.Entities.Add(line1);
group.Entities.Add(line2);
DxfDocument dxf = new DxfDocument();
// when we add a group to the document all the entities contained in the group will be automatically added to the document
dxf.Groups.Add(group);
// adding the group entities to the document is not necessary, but doing so should not cause any harm
// the AddEntity method will return false in those cases, since those entities are already in the document
dxf.AddEntity(line1);
dxf.AddEntity(line2);
dxf.Save("group.dxf");
DxfDocument load = DxfDocument.Load("group.dxf");
Console.WriteLine("Press a key to finish...");
Console.ReadKey();
}
