topic Re: Scaling and constraing certain portion in a object in Dynamic Blocks Forum

Scaling and constraing certain portion in a object

Sujan.Maharjan — Fri, 12 Aug 2016 08:21:40 GMT

Hi,

I'm trying to make a Elbow fitting with insulation lines to be shown. I have to use scale action but limiting the insulation line at certain width . But when i use scale it expands as well with the propotion of scale.

I tried to use dimensional constraints but it distorted shape.

Please anybody suggest how should i approach this problem

Re: Scaling and constraing certain portion in a object

Libbya — Sat, 13 Aug 2016 22:50:49 GMT

Here's a working version. It's silly how complicated it is.

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Sun, 14 Aug 2016 02:02:00 GMT

Thanks. But I cannot figure out how you did that .
Please can you explain how you did that

Re: Scaling and constraing certain portion in a object

Libbya — Sun, 14 Aug 2016 02:37:51 GMT

Here's a step-by-step screencast of another method that gives the same functionality, but is set up in a way that's probably more intuitive.

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Tue, 16 Aug 2016 09:28:04 GMT

Thank you so much for the screen cast 🙂

I tried to put rotate and flip action to the block but it didn't work. Rotating and Flipping the Block without changing the Hatch Angle is very important for me. I tried Alignment parameter but it changed hatch angle

Waiting for your reply

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Tue, 16 Aug 2016 09:09:23 GMT

Can i use Alignment parameter on both side without rotating hatch angle?

Re: Scaling and constraing certain portion in a object

Libbya — Tue, 16 Aug 2016 14:44:42 GMT

Align parameter will rotate the entire block including the hatch.

With the chained parameters/actions I do not know a way to make it rotate/flip properly. It might be doable, but if possible, would require more time to sort out than I can donate.

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Wed, 17 Aug 2016 06:16:45 GMT

Ok . Thanks for trying to help me

Re: Scaling and constraing certain portion in a object

Libbya — Wed, 17 Aug 2016 16:02:45 GMT

I gave this a bit more thought and came up with a solution. I knew that the issue with the rotate and flip actions was that the chained point parameters with stretch actions were activated when flipped or rotated, skewing the line work. I thought that if I could eliminate the chained point parameters then the flip and rotate could be added. The chained linear parameters only have scale actions associated and scale actions are not activated when the associated parameter is flipped/rotated/moved because the parameter does not change size and size is what matters to a scale action. Because of this, the chained linear parameters can be flipped/rotated without issue.

In order to eliminate the chained point parameters, I knew that I would need to create their relative actions based directly on the change to the Distance1 parameter. This screencast shows how I did so. After the chained point parameters were eliminated, the rotate and flip actions were relatively easy to add. See attached screencast for the step-by-step.

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Thu, 18 Aug 2016 07:26:10 GMT

Thanks for your giving me your precious time . You taught me a lot 🙂

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Mon, 05 Sep 2016 04:18:28 GMT

Hi libbya,

I have to do this with various shapes . I followed your Screen cast and did it. But couldn't do the same with other shapes(Angles).

Is there any simpler way to do this. Or teach me exactly how you do that. Waiting for your reply

Re: Scaling and constraing certain portion in a object

Libbya — Mon, 05 Sep 2016 06:08:47 GMT

If you add the offset arcs and hatch patterns to the various visibility states I will make another screencast where I add the necessary parameters/actions to a couple of the visibility states.

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Mon, 05 Sep 2016 06:45:37 GMT

Hi,

Thank You for your quick reply 🙂

Re: Scaling and constraing certain portion in a object

Libbya — Tue, 06 Sep 2016 19:19:26 GMT

Why do you have the separate visibility states for 'Below 300' and 'Above 300'. It seems they are the same aside from how far the linear parameter can stretch. Why don't you just have the full stretch range and not require switching?

Here's a screencast on how to set up the multi-visibility in a better way, IMO.

Re: Scaling and constraing certain portion in a object

Libbya — Tue, 06 Sep 2016 23:58:19 GMT

Here's a screencast that shows how to add the appropriate parameters/actions for the 90° and the 15° bends. Let me know if there are parts you do not understand.

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Wed, 07 Sep 2016 02:40:48 GMT

Hi,
Thank you so much for helping me as always 🙂
I don't understand how you calculate Angle offset and Distance multiplier. But I think I can do if i follow video
And I have to make this type of block for various Offset types .

Can I use one completed block so i can implement on other blocks with different offset arc distance as well?

Re: Scaling and constraing certain portion in a object

Libbya — Wed, 07 Sep 2016 04:19:22 GMT

In the video you will notice that i draw a PL at the grip of the controlling linear parameter. I make the PL 1 unit in length. In the test block window I draw two more PLs, one from each outer corner. I then stretch the block and snap to the other end of the 1 unit PL. I then snap the outer ends of the two other PLs to the outer corners in their scaled position. Those added two PLs now are the length of the distance offset and the angle of the angle offset for the two stretch actions.

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Thu, 08 Sep 2016 01:45:49 GMT

Hi, I'm trying to learn Lookup and Double Lookup. I looked at Value reference table but not working as expected or i dont understand the concept. I searched in internet but not found learning resources about that. Can you suggest me where to learn about that?

Re: Scaling and constraing certain portion in a object

Libbya — Thu, 08 Sep 2016 14:58:00 GMT

I don't know of any documentation other than the AutoCAD help files.

The gist of a single lookup is that when the block is adjusted so that the 'input properties' match a row on the table, the 'lookup property' is changed to that row. When a table 'allows reverse lookup' and has a grip visible, a user can click the grip and select a lookup row. The lookup will then force the input parameter values to match that row.

A double lookup takes that concept a step further. There are two tables associated with the lookup parameter. One of the tables is used as an 'input' table and the other must allow reverse lookup and is used as an 'output' table. When the block parameters are adjusted, the input table is used to determine the row. The lookup property names must match on input an output tables. The output table will adjust the parameters to match the selected row.

Make sense?

Re: Scaling and constraing certain portion in a object

Sujan.Maharjan — Sun, 11 Sep 2016 03:00:16 GMT

Hi,

I followed the table and I try to enter data but Autocad always says duplicate rows found.

If i need Less or equal to any number for eg. 450 and greater than 450 for another row what should i enter?