Re: Drawing a transparent labe over another control - C# Discussion Boards

Re: Drawing a transparent labe over another control

31-Mar-05 6:34

A more appropriate way would be to extend the ProgressBar control and draw the label yourself. Putting a transparent control over it will require owner drawing anyway (to mask out everything but the text, which isn't easy if you want anti-aliased text) and will require more memory since another control is required (controls are windows and too many is very expensive).

So, extend the ProgressBar class and draw the text in the middle like so (just a basic example):

public class ProgressWithText : ProgressBar
{
  Brush textBrush;
  public ProgressWithText()
  {
    SetStyle(ControlStyles.UserPaint, true);
    textBrush = new SolidBrush(ForeColor);
  }
 
  protected override void OnPaint(PaintEventArgs e)
  {
    base.OnPaint(e);
 
    e.Graphics.DrawString(Value.ToString() + "%", Font, textBrush,
      (RectangleF)Bounds);
  }
  protected override void OnForeColorChanged(EventArgs e)
  {
    base.OnForeColorChanged(e);
    if (textBrush != null)
      textBrush.Dispose();
 
    textBrush = new SolidBrush(ForeColor);
  }
}

If you want to change the color of part of the text when the actual progress bar moves under the text, you should consider painting the whole thing (easier in the long run), which isn't too hard. Search for "progress bar" on this site for a number of good articles about owner-drawn progress bars.

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RudyBone31-Mar-05 6:51

RudyBone

31-Mar-05 6:51

Thanks, however when I go to compile this code, the compiler tells me that I can't inherit from ProgressBar because the class is sealed.

Re: Drawing a transparent labe over another control

Heath Stewart31-Mar-05 8:24

31-Mar-05 8:24

Hmm...so it is. I must apologize. I've never had a reason to extend it and other controls are sealed that I have extended. Progress bars are very easy to create. Please follow my suggestion to search this site for "progress bar" and you'll find lots of articles how, including progress bars with gradients, custom pictures, and more; some even provide sample code that shows how to draw the percentage text (similar to how I did it above).

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image Resize

muslcesonvacation31-Mar-05 5:20

muslcesonvacation

31-Mar-05 5:20

Hi
I'm having an error "A generic error occurred in GDI+." with the following image resize code. can anybody help. PLZ

private void cmdStart_Click(object sender, System.EventArgs e)
{
if (( File1.PostedFile != null) && (File1.PostedFile.ContentLength > 0))
{
//determine file name
string szFileName = System.IO.Path.GetFileName(File1.PostedFile.FileName);
Size s = new Size(75,75);
ImageResize(File1.PostedFile.FileName,s);
}
}
void ImageResize(string str_file, Size new_size)
{
try
{
System.Drawing.Image src_image = System.Drawing.Image.FromFile(str_file);
Bitmap bitmap = new Bitmap(new_size.Width, new_size.Height,src_image.PixelFormat);
Graphics new_g = Graphics.FromImage(bitmap);
new_g.SmoothingMode =System.Drawing.Drawing2D.SmoothingMode.HighQuality;
new_g.InterpolationMode =System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
new_g.DrawImage(src_image, 0, 0, bitmap.Width, bitmap.Height);
src_image.Dispose();
bitmap.Save("C:\\Inetpub\\wwwroot\\ImageConverter\\bin\\resize.jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
new_g.Dispose();
bitmap.Dispose();
}
catch(Exception e)
{
string a = e.Message;
}
}

Thanks
Gary

Heath Stewart31-Mar-05 5:27

31-Mar-05 5:27

I have a couple of questions.

On what line, exactly, does the exception get thrown? Please step through your code in the debugger. I'm assuming it's Graphics.DrawImage.
What is the pixel format of the image that you ran through the method?

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Microsoft

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muslcesonvacation31-Mar-05 5:31

muslcesonvacation

31-Mar-05 5:31

Hi,

The exception is being thrown on the bitmap.save method.

Thanks
Gary

Heath Stewart31-Mar-05 6:25

31-Mar-05 6:25

What as the pixel format of the original image you passed through the method?

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Software Design Engineer
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Microsoft

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Heath Stewart31-Mar-05 6:23

31-Mar-05 6:23

One other thing I noticed that, if "ImageConverter" is your ASP.NET project, you should not put files in the bin sub-directory. If ASP.NET is configured to handle the .jpg extension, then - by default - users will not be able to access bin\resize.jpg because access to files in the bin directory is disallowed by ASP.NET. You should consider saving the file to a directory users can access if you plan on passing it back as the src attribute of an IMG tag.

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Dates

scotlandc31-Mar-05 5:11

scotlandc

31-Mar-05 5:11

Hi,

I am trying to set the value of a DateTimePicker to the first of next month in a UK date format.

ie every day this month (March) the DTP will read 01/04/2005 then next month it will read 01/05/2004.

Anyone know how it can be done? I've sorted the month part out with AddMonth(1) but have no idea how to set the date to 01 each time?

Please can someone help?

Thanks in advance

Scott

Re: Dates

techieboi31-Mar-05 5:57

techieboi

31-Mar-05 5:57

Alright mate, not sure I understand your problem but hopefully the code below will help.

DateTime startOfMonth = DateTime.Now.AddMonths(1);
startOfMonth = startOfMonth.AddDays(-startOfMonth.Day + 1);

The code add's one month to the current date and then defaults the date to the 1st of the month.

Re: Dates

Heath Stewart31-Mar-05 6:19

Whidbey - beta1 - "Beta period has expired!!!"

31-Mar-05 6:19

Do keep in mind that the DateTime type always uses the Gregorian calendar, so you should use the Calendar class to truly get the right date if not doing this strickly for the DateTimePicker. See http://blogs.msdn.com/michkap/archive/2005/03/28/402839.aspx[^] for more information.

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Software Design Engineer
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Microsoft

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Re: Dates

scotlandc4-Apr-05 0:52

scotlandc

4-Apr-05 0:52

Thanks for replying folks, much appreciated.

The code works perfectly, thank you.

I will bear that in mind about the Gregorian Calendar too, thanks for pointing it out.

Again, much appreciated.

Scott Wink | ;)

abcxyz8231-Mar-05 3:59

abcxyz82

31-Mar-05 3:59

Hi all,

I was experimenting with generics and some new stuff of ASP.NET 2.0 in whidbey beta1 given during Teched 2004...everything was working fine till last night..and suddenly today morning when i opened beta1 horrible dialog box saying - "The beta period has expired- thank you for participating in our beta program, you can now safely remove Microsoft development environment from your computer" appeared...I have checked google and found that expiry date of whidbey beta1 is around 15th July 2005..so whats up???

The strange thing is - "It didnt show me any warning that my version is going to expire..." My colleagues are using the same version(teched beta1) but its fine for them...

So, Is there any way by which I can open that solution!!!!

Thanks in advance!!!

REgards
MaulikCE

i don want

Re: Whidbey - beta1 - "Beta period has expired!!!"

Judah Gabriel Himango31-Mar-05 4:53

Judah Gabriel Himango

31-Mar-05 4:53

Why not just use the Whidbey Beta 1 that's freely available on MSDN? You can download the express versions or have them mail you a DVD of the Enterprise version.

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Re: Whidbey - beta1 - "Beta period has expired!!!"

Koushik.roy@rbc.com31-Mar-05 10:33

Koushik.roy@rbc.com

31-Mar-05 10:33

Check the date on your system. You system may be set to a date of future. D'Oh! | :doh:

Question on File.Copy

RockRock31-Mar-05 3:42

RockRock

31-Mar-05 3:42

I want to duplicate a file.
However, exception occured when I use the Copy method twice.

e.g.
File.Copy("from1.jpg","to.jpg,true");
File.Copy("from2.jpg","to.jpg,true");

How can i solve it?

Colin Angus Mackay31-Mar-05 4:28

Colin Angus Mackay

31-Mar-05 4:28

I can only assume, since you don't say what the exception is, that the error is because you are copying two files to one destination and that it won't overwrite the existing file. I suggest that you choose a different file name for the second copy operation.

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RockRock31-Mar-05 4:35

RockRock

31-Mar-05 4:35

Thank you for your reply.

The exception is about the file is being used by other application.

In my algorithm, they should be copied to the same file name.
How can I solve it?

Colin Angus Mackay31-Mar-05 4:39

Colin Angus Mackay

31-Mar-05 4:39

I think the clue is in the question. Make sure the file isn't being used by another application. (or even by the same application)

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