topic Re: Create image from Geometry in .NET Forum

Create image from Geometry

BrentBurgess1980 — Tue, 19 Apr 2022 08:48:12 GMT

Hi All,

I am trying to create an image of of a polyline to be used in an image, however, I have not been able to find anything that would help.

I have tried creating a block but this hasn't been as successful as I'd hoped.

If it were just straight line segments, I could probably conjure something up with points and draw an image, but as there may be curves in the polyline, I am not sure how I would tackle that.

I have googled

Image from Entity

Copy Entity to Clipboard (thinking I could use the image)

Generate Bitmap from Entity

and other variations of the above.

Does anyone have any tips or references for this?

Thanks,

Brent

Re: Create image from Geometry

SENL1362 — Tue, 19 Apr 2022 10:20:05 GMT

And the problem is?

Have a look at CapturePreviewImage

Sample:

... //Turn layers on/off and or set LineWeight db.UpdateExt(true); dynamic acadApp = AcadApp.AcadApplication; acadApp.ZoomExtents(); ed.ZoomScale(1.03); ... var size = doc.Window.DeviceIndependentSize; using (var bmp = doc.CapturePreviewImage(Convert.ToUInt32(size.Width), Convert.ToUInt32(size.Height))) { //TopLeft Pixel must be backgroud to make it transparent, use ZoomScale(1.03) var firstPxl = bmp.GetPixel(0, 0); //255,0,0 white or Black bmp.MakeTransparent(firstPxl); if (File.Exists(IconPathname)) File.Delete(IconPathname); bmp.Save(IconPathname, System.Drawing.Imaging.ImageFormat.Png); }

Re: Create image from Geometry

R.Gerritsen4967 — Tue, 19 Apr 2022 11:37:23 GMT

Instead of using the PreviewImage of a drawing you can also make a plot to a file.

See this example for plotting to a PDF file. If you change the plotconfiguration file to the 'PublishToWeb PNG.pc3', it is possible to plot to a .png file.

Re: Create image from Geometry

hippe013 — Thu, 21 Apr 2022 19:56:37 GMT

Did you happen to read Kean's updated post regarding the original link that you posted about generating an image from blocks?

https://through-the-interface.typepad.com/through_the_interface/2013/11/generating-larger-preview-images-for-all-blocks-in-an-autocad-drawing-using-net.html

Re: Create image from Geometry

BlackBox_ — Fri, 22 Apr 2022 11:01:22 GMT

@SENL1362 wrote:

... //TopLeft Pixel must be backgroud to make it transparent, use ZoomScale(1.03) var firstPxl = bmp.GetPixel(0, 0); //255,0,0 white or Black bmp.MakeTransparent(firstPxl); ...

Love that lil' trick:

https://forums.augi.com/showthread.php?172533-PNGOUT-with-transparent-background-option&p=1338401&viewfull=1#post1338401