topic Re: Block Preview in ObjectARX Forum

Block Preview

lot6231 — Tue, 12 Dec 2023 23:59:20 GMT

Help me please.

I want to implement a preview of the block as shown in the picture above.
However, it is difficult to find sample code for this. Is there a sample project?

Example function

if(pBlockTblRcd->hasPreviewIcon()){ AcDbBlockTableRecord::PreviewIcon prevIcon; pBlockTblRcd->getPreviewIcon(prevIcon); }

Re: Block Preview

tbrammer — Wed, 13 Dec 2023 16:41:45 GMT

You could try

bool acdbGetPreviewBitmapFromDwg( const ACHAR* pszDwgfilename, HBITMAP* pPreviewBmp, HPALETTE* pRetPal );

For a deluxe version check out Madhukar Moogala's BlockView sample project on GitHub, which offers a zoomable and rotateable preview with selectable shademode.

As an alternative you can use the ATIL API in <ObjectARX>\utils\Atil to create rendered views of the drawing.

Re: Block Preview

lot6231 — Wed, 13 Dec 2023 23:27:28 GMT

Can I make only the blocks visible using the acdbGetPreviewBitmapFromDwg function?

This seems to show the entire drawing.

Re: Block Preview

Alexander.Rivilis — Wed, 13 Dec 2023 23:42:41 GMT

@lot6231

Try this code: https://www.caduser.ru/forum/post76585.html#p76585

Re: Block Preview

lot6231 — Thu, 14 Dec 2023 00:55:27 GMT

How do I display the preview with that code?
Sorry, but please tell me a little more.

Re: Block Preview

Alexander.Rivilis — Thu, 14 Dec 2023 11:29:47 GMT

I've found a very old sample. Maybe it helps you.

Re: Block Preview

lot6231 — Fri, 15 Dec 2023 07:53:54 GMT

Sorry, but this project doesn't seem to be working.
Are there any other examples?

Re: Block Preview

tbrammer — Fri, 15 Dec 2023 09:33:52 GMT

I think it works only if the block already has a preview icon.
At first glance I don't see code that creates a preview from the block contents.
Did you try the BlockView sample project on GitHub, ?

Re: Block Preview

Alexander.Rivilis — Fri, 15 Dec 2023 11:12:11 GMT

@lot6231 wrote:

Sorry, but this project doesn't seem to be working.

This block has preview icon? If no, you can create it with BLOCKICON command.

Re: Block Preview

lot6231 — Fri, 15 Dec 2023 13:10:22 GMT

So, is there a project where I can preview only blocks other than icons?

Re: Block Preview

tbrammer — Fri, 15 Dec 2023 13:27:11 GMT

The BlockView sample project on GitHub, works. Check it out.

(view in My Videos)

Re: Block Preview

lot6231 — Mon, 18 Dec 2023 02:09:54 GMT

If I want to show only the blocks I want, what's the way? I'm sorry, but using this method, other objects will look overlapping.(What should I do if I only want to see block1?)

Re: Block Preview

lot6231 — Tue, 19 Dec 2023 07:18:06 GMT

I edited the existing project and modified it once.
This is what I want.
Thank you all.

(view in My Videos)