CODEWITHSUNDEEP
c#rotationautocadautocad-plugin
Nick Gilbert
Nick Gilbert

Reputation: 4240

Odd behavior from C# rotating function

I'm trying to programmatically rotate the purple block in AutoCAD shown here by 90 degrees so that it lines up with the orange block.

enter image description here

The purple block's base point is the lower left hand corner. Using AutoCAD's built in rotate function gives me the result that I want shown here:

enter image description here

But when I try to rotate it programmatically with this function

public static BlockReference RotateBlockWithAttributes(ObjectId passedIdOfBlockToRotate)
{
    Transaction tr = _database.TransactionManager.StartTransaction();
    DocumentLock docLock = _activeDocument.LockDocument();

    using (tr)
    using (docLock)
    {
        BlockReference blockToRotate = tr.GetObject(passedIdOfBlockToRotate, OpenMode.ForWrite) as BlockReference;
        blockToRotate.TransformBy(Matrix3d.Rotation(Math.PI / 2, blockToRotate.Normal, blockToRotate.Position));
        tr.Commit();
        return blockToRotate;
    }
}

I get this result

enter image description here

And have no idea why...

Upvotes: 2

Views: 465

Answers (1)

Augusto Goncalves
Augusto Goncalves

Reputation: 8594

I believe you should change the BlockReference.Rotation property instead.

From the help file:

Accesses the rotation value (in radians) of the block reference. The rotation value is relative to the X axis of a coordinate system that is parallel to the OCS of the block reference, but has its origin at the position point of the block reference. The rotation axis is the Z axis of this coordinate system with positive rotations going counterclockwise when looking down the Z axis towards the origin.

Upvotes: 1

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