Update Dynamic block hatch

[CAD-Geek]

I use this solution (by @_gile )to edit dynamic block stretch via two points from the user. and that dynamic block has a hatch that also needs to stretch.

but the issue is that hatch not update properly. as the next image.

 

but when I open that block in block editor and Zoom Extents. close block editor and save it looks fine and work well.

the dynamic block attached.

[_gile · Accepted solution]

Hi,

Simply try to remove the hatch from the stretch action selection (the associativity of the hatch is enough to make it dynamic).

[Anonymous]

Sorry to resume an old topic, but I've been struggling with this problem since many years now... never got a final solution... sometimes the xhatch need to excluded, sometime needs to be included in the strech action.

Sometime the block instances need a strong action to rebuild the hatch correctly (like editing, doing nothing and saving the block), sometimes it's enough to get the dynamic grip, move it around and get back to the original position...

Is there something I can do programmatically to force a xhatch rebuild after I created the blockreference and assigned the correct values to the dynamic parameters?

This is what I tried, without success:

BlockTableRecord btr = tr.GetObject((br.BlockTableRecord), OpenMode.ForWrite, false) as BlockTableRecord;
if (btr != null)
{
    foreach (ObjectId o in btr)
    {
        DBObject dbo = tr.GetObject(o, OpenMode.ForRead, false);
        if (!dbo.IsErased && (dbo is Hatch))
        {
            Hatch hh = dbo as Hatch;
            hh.UpgradeOpen();
            hh.EvaluateHatch(false);
        }
    }
}

[SRSDS]

Not sure if it's ok that it's ok that I'm bumping these posts but they are all facing the same issue.   

https://forums.autodesk.com/t5/net/dynamic-block-with-associative-hatch/td-p/10023207

[FRFR1426]

Best I've found is to recreate the hatch:

static void ReCreateHatch(BlockReference blockReference)
{
    var blockTableRecord = (BlockTableRecord)blockReference.BlockTableRecord.GetObject(OpenMode.ForWrite)!;
    foreach (ObjectId id in blockTableRecord)
    {
        var hatch = id.GetObject(OpenMode.ForRead) as Hatch;
        if (hatch == null || !hatch.Associative) continue;
        var newHatch = new Hatch();
        blockTableRecord.AppendEntity(newHatch);
        blockTableRecord.Database!.TransactionManager!.AddNewlyCreatedDBObject(newHatch, add: true);
        newHatch.SetPropertiesFrom(hatch);
        newHatch.SetHatchPattern(HatchPatternType.PreDefined, hatch.PatternName!);
        ObjectIdCollection ids = hatch.GetAssociatedObjectIds()!;
        newHatch.AppendLoop(HatchLoopTypes.Outermost, ids);
        newHatch.EvaluateHatch(underEstimateNumLines: true);
        hatch.UpgradeOpen();
        hatch.Erase();
    }
}