Re: Create Image in WinForms vs Asp.net - C# Discussion Boards

Luc Pattyn30-Apr-10 11:41

30-Apr-10 11:41

Here is one idea: replace Transparent by White, just to see if that gives decent quality. I never trust Windows and transparency, it holds too many surprises.

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Re: Create Image in WinForms vs Asp.net

#realJSOP30-Apr-10 12:04

#realJSOP

30-Apr-10 12:04

Even if it displayed better, I need the background to be transparent. Frown | :(

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Re: Create Image in WinForms vs Asp.net

Luc Pattyn30-Apr-10 12:30

Luc Pattyn

30-Apr-10 12:30

IMO making a little step sidewards is often useful in a debug session, even when it violates functional specs.

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Re: Create Image in WinForms vs Asp.net

#realJSOP30-Apr-10 23:10

#realJSOP

30-Apr-10 23:10

At this point, I'm tempted to just create the graphics with photoshop and call it a day.

Re: Create Image in WinForms vs Asp.net

#realJSOP1-May-10 3:07

#realJSOP

1-May-10 3:07

Well, it does in fact ONLY happen when I use g.Clear(Color.Transparent). That's a real pisser because now I have to do a screen cap of the gradient background we use in the Silverlight app so I have a non-transparent image to render the text onto. What a pain in the ass... and all because a) Silverlight's element rotation f*cks up your layout, and b) it doesn't allow you to build images on the fly.

Re: Create Image in WinForms vs Asp.net

Luc Pattyn1-May-10 3:32

Luc Pattyn

1-May-10 3:32

From everything I read about it over the years, I gathered transparency on Windows is a PITA. I try and stay away from it as much as possible.
Thanks for reporting.

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Re: Create Image in WinForms vs Asp.net

#realJSOP1-May-10 7:35

#realJSOP

1-May-10 7:35

I've observed that it works fine in Winforms, but it sucks in asp.net

Re: Create Image in WinForms vs Asp.net

Luc Pattyn1-May-10 8:19

Luc Pattyn

1-May-10 8:19

you may want to repost in ASP.NET forum then; and probably add a sample of each.

Did you notice anything different in the properties of both Graphics objects? From what you told so far, it isn't clear to me yet whether this indicates a bug or something you overlooked.

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Re: Create Image in WinForms vs Asp.net

#realJSOP1-May-10 8:47

#realJSOP

1-May-10 8:47

Complaints are many regarding he quality of text rendered on a transparent bitmap. The one thing I haven't tried yet is creating a transparent bitmap disk file, loading that in the asp.net page code behind, and rendering text on it. I can tell you that creating the (transparent) bitmap in code and rendering text onto it creates a crappy looking image. IMHO, it's a bug.

Re: Create Image in WinForms vs Asp.net [modified]

#realJSOP1-May-10 9:10

#realJSOP

1-May-10 9:10

In the interest of being able to say that I "tried everything", I created a png file that was nothing but a transparent background, as well as one that was nothing but a white background. Rendering text on the transparent file looked just like it did as if I had created the whole thing in memory - in other words, crap. The white png file resulted in perfectly anti-aliased text.

I just don't understand...

EDIT ===========

I also created a new white image that had the transparent color set to white. This generated a better image, but not NEARLY as good as having some sort of color on the bitmap.

modified on Saturday, May 1, 2010 3:22 PM

Re: Create Image in WinForms vs Asp.net

Luc Pattyn1-May-10 9:48

Luc Pattyn

1-May-10 9:48

Maybe the root cause is one of these:

1.
there are two ways to try and achieve transparency; one is by using the alpha channel, that should allow a blend, so anti-aliased stuff can result in semi-transparent pixels; the other is by setting apart a special color which will be treated as transparent later on; blending here fails as the result is different from the one (or few) special colors.

2.
what is the actual color of a transparent pixel, i.e. how does it blend with another color (does it behave as white? as black?). Different environments may have implemented different views on this.

I do have my private link collection on transparency; I haven't read most of the articles yet, if you're interested and have the time, here they are:

http://gimp-tutorials.net/node/91[^]

http://gimp-tutorials.net/outlinetext[^]

Transparency Tutorial with C# - Part 1[^]

Transparency Tutorial with C# - Part 2[^]

Transparency Tutorial with C# - Part 3[^]

http://www.codeproject.com/KB/bugs/EasyTransparentControls.aspx[^]

http://www.codeproject.com/KB/cpp/transparent__png.aspx[^]

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Re: Create Image in WinForms vs Asp.net

#realJSOP1-May-10 14:00

#realJSOP

1-May-10 14:00

Luc Pattyn wrote:
there are two ways to try and achieve transparency; one is by using the alpha channel, that should allow a blend, so anti-aliased stuff can result in semi-transparent pixels; the other is by setting apart a special color which will be treated as transparent later on; blending here fails as the result is different from the one (or few) special colors.

I tried it both ways - neither result was acceptable, but the transparent color version was the best of the two.

Picture in Crystal Report

SajjadZare30-Apr-10 8:55

SajjadZare

30-Apr-10 8:55

Hi I have a picture object in crystal report
I want to set picture that user select from 'Browse' button to it in runtime
how can i do it ?

Directshow.net pitch audio control

akaiito30-Apr-10 7:26

akaiito

30-Apr-10 7:26

Hi

I am using C# and directshow.net for play video . i have problem about sound , i want use pitch control for audio but i don't know how to make.

( increase or decrease audio output tone ) pitch audio filter

please heplme

-

http://www.codeproject.com/KB/directx/directshownet.aspx

Problems with Label's Properties

jonatan_55630-Apr-10 6:46

jonatan_556

30-Apr-10 6:46

Hello everyone.

I'm developing an aplication and in one part of the code i want to change the state of the Visible label property.

EX: By default

label.Visible = false

and then, somewhere in the code i make

label.Visible = true

.

When i run the aplication everything goes right but, in debug mode, after changing the property state from false to true if i check the value in the immediate window it still appear false.

What's the problem.

Excuse my inglish but it is not my native language.
regards Jonatan. Thanks.

Re: Problems with Label's Properties

Abhinav S30-Apr-10 7:05

Abhinav S

30-Apr-10 7:05

Weird - I tried to recreate this problem in VS2010 but could not do so.
Which version of VS (and framework) are you using?

Re: Problems with Label's Properties

jonatan_5562-May-10 22:59

jonatan_556

2-May-10 22:59

Hello. Thanks for the reply.
I'm using VS2005 and the framework is 2.0.
regards jonatan

Re: Problems with Label's Properties

Eddy Vluggen1-May-10 1:34

Eddy Vluggen

1-May-10 1:34

jonatan_556 wrote:
What's the problem.

The property has a setter and a getter. The "getter" only shows the current value.

Now, when you change the value in the debugger, the application that is being debugged is halted - you can see how the application even pauses drawing the screen if it has hit a breakpoint.

Once it continues, then it will send a message to the label, saying it needs to change visibility. The application that's being debugged will do so when it's processing this message. That takes time - in the meanwhile you're looking at an old value in the debugger.

I are Troll Suspicious | :suss:

class c#

tek 200930-Apr-10 3:44

tek 2009

30-Apr-10 3:44

hi I created a global class that contains this code:

public class ClassS
   {

       #region variable et propriété
       private   int codemessage;
       /// <summary>
       /// le code du message qui détérmine les propriétés
       /// </summary>
       public int Codemessage
       {
           get { return codemessage; }
           set { codemessage = value; }
       }


       #endregion

I would like to create a subclass that inherits this property, stating in this class values of this property, the code message can have 13 values of 200 to 212, and should be declared in this class,
for example:

200=immatricule
201=kilometrage
...............

Re: class c#

Not Active30-Apr-10 4:12

Not Active

30-Apr-10 4:12

membre123 wrote:
I would like to create a subclass that inherits this property

Ok, so derive from it. The property is public so it will be available.

membre123 wrote:
message can have 13 values of 200 to 212

Then you need to use a collection

And "class c#" as a subject title in the C# forum is pretty much useless and uninformative. Try something more descriptive of your question or issue next time.

I know the language. I've read a book. - _Madmatt

Re: class

tek 200930-Apr-10 4:38

tek 2009

30-Apr-10 4:38

yes you are right, and thank you for the comment
but in the child class property is not displayed and here is the code used:

namespace CarteGrise 
{
   
    public class CarteGrise :ClassS 
    {

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using ClasseSup
#region variable et propriete
..................
#endregion
 public List<ClassS> liste = new List<ClassS>();

Re: class

Not Active30-Apr-10 4:47

Not Active

30-Apr-10 4:47

If I understand this, then CarteGrise does not need to derive from ClassS at all. Also, if ClassS only contains one property then a class is overkill and unnecessary. A simple collection of stings would be sufficient.

I know the language. I've read a book. - _Madmatt

Re: class

AspDotNetDev30-Apr-10 20:34