Creation of semi-transparent filled polygons?

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

B. Chernick - 30 Sep 2004 03:51 GMT

I have relatively little experience in Dot Net graphics.

I have a picturebox with a background image. For the purpose of this
application it is necessary to draw polygons (both filled and outline only)
to emphasize parts of the image. It would probably be better if the
background image remained at least partly visible.

Is there any simple way to generate a semi-transparent filled polygon?

Reply to this Message

Bob Powell [MVP] - 30 Sep 2004 09:02 GMT

Just draw the shape you like with a brush that has an alpha component.

//in the Paint handler...
SolidBrush b=new SolidBrush(Color.FromArgb(128,Color.Red));
e.Graphics.FillRectangle(10,10,100,150);

HTH.

Signature

Bob Powell [MVP]
Visual C#, System.Drawing

Answer those GDI+ questions with the GDI+ FAQ
http://www.bobpowell.net/gdiplus_faq.htm

The GDI+ FAQ RSS feed: http://www.bobpowell.net/faqfeed.xml
Windows Forms Tips and Tricks RSS: http://www.bobpowell.net/tipstricks.xml
Bob's Blog: http://bobpowelldotnet.blogspot.com/atom.xml

> I have relatively little experience in Dot Net graphics.
>
[quoted text clipped - 4 lines]
>
> Is there any simple way to generate a semi-transparent filled polygon?

Reply to this Message

B. Chernick - 01 Oct 2004 02:49 GMT

Perfect. Thanks!

(Things have changed a little since I learned how to draw lines in
TurboPascal class.)

> Just draw the shape you like with a brush that has an alpha component.
>
[quoted text clipped - 13 lines]
> >
> > Is there any simple way to generate a semi-transparent filled polygon?

Reply to this Message

Creation of semi-transparent filled polygons?

Free Magazines