473,804 Members | 3,412 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

create bitmap with tranparent region

Hi,

i try to create a bitmap with transparent regions, but it does not work.
the transparent region turns out to be black.
anybody some ideas??
Dim bmap As Bitmap(100,100, Imaging.PixelFo rmat.Format32bp pPArgb)
Dim g As Graphics = Graphics.FromIm age(bmap)
g.Clear(Color.T ransparent)
g.DrawRectangle (New Pen(Color.Blue, 10), New Rectangle(10, 10, 80,80))
g.dispose

'do something with the bitmap....
Nov 21 '05 #1
2 2075
Hi,

Dim bm As New Bitmap(100, 100)

Dim g As Graphics = Graphics.FromIm age(bm)

g.FillRectangle (Brushes.Blue, 0, 0, 100, 100)

g.FillRectangle (Brushes.Green, 10, 10, 10, 10)

g.FillEllipse(B rushes.Green, 50, 50, 20, 20)

bm.MakeTranspar ent(Color.Green )

g.Dispose()

Ken

-----------------------------

"Willie jan" <un*****@unkown .com> wrote in message
news:41******** *************** @news.euronet.n l...
Hi,

i try to create a bitmap with transparent regions, but it does not work.
the transparent region turns out to be black.
anybody some ideas??
Dim bmap As Bitmap(100,100, Imaging.PixelFo rmat.Format32bp pPArgb)
Dim g As Graphics = Graphics.FromIm age(bmap)
g.Clear(Color.T ransparent)
g.DrawRectangle (New Pen(Color.Blue, 10), New Rectangle(10, 10, 80,80))
g.dispose

'do something with the bitmap....

Nov 21 '05 #2
thanks.

"Ken Tucker [MVP]" <vb***@bellsout h.net> schreef in bericht
news:uP******** ******@TK2MSFTN GP14.phx.gbl...
Hi,

Dim bm As New Bitmap(100, 100)

Dim g As Graphics = Graphics.FromIm age(bm)

g.FillRectangle (Brushes.Blue, 0, 0, 100, 100)

g.FillRectangle (Brushes.Green, 10, 10, 10, 10)

g.FillEllipse(B rushes.Green, 50, 50, 20, 20)

bm.MakeTranspar ent(Color.Green )

g.Dispose()

Ken

-----------------------------

"Willie jan" <un*****@unkown .com> wrote in message
news:41******** *************** @news.euronet.n l...
Hi,

i try to create a bitmap with transparent regions, but it does not work.
the transparent region turns out to be black.
anybody some ideas??
Dim bmap As Bitmap(100,100, Imaging.PixelFo rmat.Format32bp pPArgb)
Dim g As Graphics = Graphics.FromIm age(bmap)
g.Clear(Color.T ransparent)
g.DrawRectangle (New Pen(Color.Blue, 10), New Rectangle(10, 10, 80,80))
g.dispose

'do something with the bitmap....

Nov 21 '05 #3

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

1
3787
by: André Borchert | last post by:
Hello, how do you select a region (area = x1,y1,x2,y2) of a bitmap and cut or copy this selection into a new bitmap ? The original could be a Bitmap object or a Image/PictureBox object. However, the selected area has to be a new image as I make some Pixel calculations with the selected area only, while the original image keeps untouched. Regards,
0
1059
by: James Dean | last post by:
Question 1:I have my full image and i only display that when the zoom rate is 1:1......i guess i will set my default display to 1:16.....is it okay to just return a thumbnail of the entire image for all the zooms down from 1:1......As well when i zoom down further do i have to convert to 16bpp for display puposes. The user is allowed to edit the bitmap at each zoom. Can you edit a thumbnail?. Question 2:Also if i rotate a bitmap does the...
0
2181
by: Anonieko Ramos | last post by:
> I have a graphics images that I want to convert to > ASCII art. How do I do it? > Code: - Default.aspx.cs
2
1728
by: Hrvoje Voda | last post by:
What is wrong with this code ? I get message "Attachment.bmp". Bitmap bm = Bitmap.FromFile(@"..\..\Attachment.bmp") as Bitmap; //use the color from 0,0 as tranparent
0
2296
by: Balu Ramachandran | last post by:
How can I create the Thumbnail view from the form? In the following approach I tried but Iams facing some limitations to get the thumbnail image of the form alone. Plaese any one can help in this regard. It is a serious problem for me. Thanks! Approach - I - Bitmap (screen capture method) ============================================= Can able to create the thumbnail image using Bitmap and BitBlt.
3
7359
by: news | last post by:
Hi Guys, Sorry if this is an obvious question but Im trying to rotate a bitmap and then save it. So far Ive only found how to rotates a Graphic but I can't find how to save it. I also want to crop the image and resize it, but I assume thats straight foward and for the code below Ive set the resize to 0.5 the original size and left the crop out. This is what Ive got so far :-
3
417
by: Richard Skopal | last post by:
In .NET Windows forms I can create a metafile using this code: Graphics grph = aControl.CreateGraphics(); IntPtr ipHDC = grph.GetHdc(); Metafile mf = new Metafile(aImgFilePath, ipHDC, EmfType.EmfOnly); grph.ReleaseHdc(ipHDC); grph.Dispose(); grph = Graphics.FromImage(mf); grph.DrawRectangle(aPen, 10, 10, 100, 120); grph.Dispose();
2
4545
by: Peter Proost | last post by:
Hi group I have the following piece of code that should resize the bitmap in a picture box but it doesn't work as I tought it would. Can someone help me with it? thnx Peter Public Class Form1 Inherits System.Windows.Forms.Form
4
3365
by: VBTricks.de.vu Webmaster | last post by:
Hello, I have an bitmap in a resources file containing all icons displayed in the toolbar. To display the icons I need to cut them out of the bitmap and add them to an imagelist. The problem is the cutting out. I wrote the following function: Public Shared Function CutOutIcon(ByRef vBitmap As Image, _ ByVal iIndex As Integer) As Image
0
9707
marktang
by: marktang | last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look ! Part I. Meaning of...
0
9585
by: Hystou | last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it. First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
1
10323
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
9161
agi2029
by: agi2029 | last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own.... Now, this would greatly impact the work of software developers. The idea...
1
7622
isladogs
by: isladogs | last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM). In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules. He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms. Adolph will...
0
5658
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4301
by: 6302768590 | last post by:
Hai team i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
2
3823
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2997
bsmnconsultancy
by: bsmnconsultancy | last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.