DG Kernel Forum

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public void TranslateLocalFrame()
{
    IEntity_DG entity = m_iStdShape.Box(2, 4, 6);
    // By default the local frame is at a corner of the box and coinsides with the global frame

    // Add a child
    IEntity_DG entityChild = m_iStdShape.Rectangle(3, 4);
    IFrame_DG frameChild = entityChild.GetLocation();
    frameChild.Translate(3, 0, 0);                // Move away from the box

    //Uncomment this return to see the initial configuration
    //return;

    IGeometricObject_DG geomObj = entity.As<IGeometricObject_DG>();

    // The new location of the local frame at the center of the box
    VectDg v = new VectDg(-1, -2, -3);
    geomObj.Translate(v);

    // Apply the same to the child
    frameChild.Translate(v);

    entity.AddChild(entityChild);

    //Uncomment this return to see the result of geometry modification
    //return;

    // Move the frame in opposite direction so that the object stays at the same location
    v.SwapDirection();
    IFrame_DG frame = entity.GetLocation();
    frame.Translate(v);

    Display(entity);
}

Code: Select all

public void MoveLocalFrame()
{
    IFrame_DG transform = m_gen.Create<IFrame_DG>();

    IEntity_DG entity = MoveGeometry(transform);

    //Comment out the next call to see the result of geometry modification

    // Move the whole entity back so that the box stays in the same place
    RestoreGeometryLocation(entity, transform);

    Display(entity);
}

public IEntity_DG MoveGeometry(IFrame_DG transform)
{
    IEntity_DG entity = m_iStdShape.Box(2, 4, 6);
    // By default the local frame is at a corner of the box and coinsides with the global frame

    // Add a child
    IEntity_DG entityChild = m_iStdShape.Rectangle(3, 4);
    IFrame_DG frameChild = entityChild.GetLocation();
    frameChild.Translate(3, 0, 0);                // Move away from the box

    //Uncomment this to see the initial configuration
    // entity.AddChild(entityChild);  return entity;

    IGeometricObject_DG geomObj = entity.As<IGeometricObject_DG>();

    IFrame_DG frame = entity.GetLocation();

    transform.Rotate(0.25 * Math.PI, 0);
    transform.Rotate(0.25 * Math.PI, 2);
    transform.Translate(-1, -2, -3);

    geomObj.Transform(transform);

    IFrame_DG frameChildNew = transform.ToGlobal(frameChild);
    frameChild.Copy(frameChildNew);

    entity.AddChild(entityChild);

    return entity;
}

public void RestoreGeometryLocation(IEntity_DG entity, IFrame_DG transform)
{
    transform.Invert(); // This modifies transform. We do not need it anymore

    IFrame_DG frame = entity.GetLocation();
    IFrame_DG framedNew = transform.ToGlobal(frame);
    frame.Copy(framedNew);
}

Code: Select all

IEntityArray_DG flatList = entity.GetChildArray(true);	//bool includeDescendents)
foreach(IEntity_DG child in flatList)
{
	entity.RemoveEntity(child);
	// do the movement here	
	entity.AddChild(child);	// Add it back
}