C# Discussion Boards - CodeProject

7-Sep-02 23:49

I want to lighten/darken the shade of a given color. I just wondered if there was a better way, than just adding/substracting an amout from each RGB value, because it in some cases, the difference in color is minute.

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"All programmers are playwrights and all computers are lousy actors."

Stephane Rodriguez.8-Sep-02 0:25

Stephane Rodriguez.

8-Sep-02 0:25

I would have lighten/darken in the HSV color space instead, then come back to RGB, since the V value is exactly the brightness component.

Algorithm here http://www.cs.bham.ac.uk/~mer/colour/hsv.html[^]

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Nnamdi Onyeyiri8-Sep-02 1:07

8-Sep-02 1:07

ok, ill look into that thanks.

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"All programmers are playwrights and all computers are lousy actors."

Nnamdi Onyeyiri8-Sep-02 1:44

8-Sep-02 1:44

ummm, that is a little confusing Confused | :confused:

im not sure where the RGB values go in and out Blush | :O

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

Stephane Rodriguez.8-Sep-02 2:07

Stephane Rodriguez.

8-Sep-02 2:07

Isn't that one clearer ?

void RGBtoHSL(COLORREF rgb, double *H, double *S, double *L)
{
   double delta;
   double r = (double)GetRValue(rgb)/255;
   double g = (double)GetGValue(rgb)/255;
   double b = (double)GetBValue(rgb)/255;
   double cmax = max(r,max(g,b));
   double cmin = min(r,min(g,b));
   *L=(cmax+cmin)/2.0;
   if(cmax==cmin) {
      *S = 0;
      *H = 0; // it's really undefined
   } else {
      if(*L < 0.5) 
         *S = (cmax-cmin)/(cmax+cmin);
      else
         *S = (cmax-cmin)/(2.0-cmax-cmin);
      delta = cmax - cmin;
      if(r==cmax)
          *H = (g-b)/delta;
      else if(g==cmax)
          *H = 2.0 +(b-r)/delta;
      else
          *H=4.0+(r-g)/delta;
      *H /= 6.0;
      if(*H < 0.0)
          *H += 1;
   }
}

int HuetoRGB(double m1, double m2, double h)
{
   if( h < 0 ) h += 1.0;
   if( h > 1 ) h -= 1.0;
   if( 6.0*h < 1 )
      return ((int) (255 * (m1+(m2-m1)*h*6.0)));
   if( 2.0*h < 1 )
      return ((int) (255 * m2));
   if( 3.0*h < 2.0 )
      return ((int) (255 * (m1+(m2-m1)*((2.0/3.0)-h)*6.0)));
   return ((int) (255 * m1));
}

void HLStoRGB(double H, double L, double S, int *r, int *g, int *b)
{
  double m1, m2;

  if(S==0) {
     *r = *g = *b = (int) (255 * L);
  } else {
     if(L <=0.5)
        m2 = L*(1.0+S);
     else
        m2 = L+S-L*S;
     m1 = 2.0*L-m2;
     *r = HuetoRGB(m1,m2,H+1.0/3.0);
     *g = HuetoRGB(m1,m2,H);
     *b = HuetoRGB(m1,m2,H-1.0/3.0);
  }
}

Nnamdi Onyeyiri8-Sep-02 2:13

8-Sep-02 2:13

clearer yes, thankyou, safe, no Smile | :)

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

using Systen.Windows.Forms namespace

James T. Johnson8-Sep-02 11:52

James T. Johnson

8-Sep-02 11:52

How about ControlPaint's Light and Dark methods? Smile | :)

James
"And we are all men; apart from the females." - Colin Davies

kab7-Sep-02 19:17

kab

7-Sep-02 19:17

Hi everybody,
I wanna know whether I can use System.Windows.Forms namespace in a Web application or not?and if yes,how?
Thanks,

Re: using Systen.Windows.Forms namespace

Paul Riley8-Sep-02 0:05

Is RegExp The Best Way to Go?

8-Sep-02 0:05

I'm sure you can use bits of it but I'm not sure why you'd want to. You certainly can't (ar at the very least shouldn't) display a Windows Forms control on a web page.

Paul

MStanbrook7-Sep-02 10:57

MStanbrook

7-Sep-02 10:57

I'm working on a small app that scrapes some HTML and parses out a few data items.

(specifically: I am trying to snag the 2 values for Total CPU Time (4:217:02:06:36) and Ranking (# 2,313) contined in the sniped below)

<br />
       <tr bgcolor="#FFFFFF" onmouseover="javascript:style.background='#E5E5E5'" onmouseout="javascript:style.background='#FFFFFF'"><br />
           <td>Total CPU Time (y:d:h:m:s) (Rank)</td><br />
           <td nowrap="true">4:217:02:06:36 (# 2,313)</td><br />
       </tr><br />

Any suggestions on HOW? I am assuming that a RegExp might be the easiest, but I'm no wizard at creating those (i.e. any suggestions/help would be appreciated).

Mike Stanbrook
mstanbrook@yahoo.com

Re: Is RegExp The Best Way to Go?

Martin Haesemeyer7-Sep-02 23:59

Martin Haesemeyer

7-Sep-02 23:59

Hi!

If you are going to use regular expressions the following article by Uwe Keim might help:

http://www.codeproject.com/string/re.asp

Cheers
HTH
Martin

"Situation normal - all fu***d up"
Illuminatus!

Re: Is RegExp The Best Way to Go?

Eric Gunnerson (msft)9-Sep-02 5:34

Eric Gunnerson (msft)

9-Sep-02 5:34

Regex should be the easiest way to go.

You'll want to use something like:

Total CPU Time \((?.+?)\)

To match the CPU time.

I suggest you download this utility:

http://www.gotdotnet.com/userarea/keywordsrch.aspx?keyword=regular%20expression%20workbench

to play around with them.

Anyone want to help design this?

Alex Korchemniy7-Sep-02 10:38

Alex Korchemniy

7-Sep-02 10:38

I want to make an automatic update system. Here is my simple plan for one:

At the begining of application init, the application will go into the updater block.

//////// Updater block psedo code

settings = Load application settings;
if (user wants auto updates)
{
//creat an instance of the updater from a library Updater.dll
Updater myUpdater = new Updater();
// updater goes online and check for updates
UpdaterFeedback = myUpdater.StartUpdater();

if (updaterfeedback == updatefound)
{
if (settings.totallyautomatic == true)
{
updater.doupdater
}
else
{
// ask user if they want to update & tell them about the update
// also give them some info on it

if (userWantsToUpdate == true)
{
updater.DoUpdate();
}
}
}
}
else
{
continue with the application startup
}

//////// End updater block

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

If you have any ideas, please post them
I have not a clue how to do the internet update check, if you have any ideas please post them.

Thanks

Nnamdi Onyeyiri7-Sep-02 11:49

7-Sep-02 11:49

well you could use the WebRequest classes to read a txt file from the net that has the latest version number for the app, and if not, downmload the new file. i cannot offer any more help on the matter, and next time, try thinking about it, istead of asking someone to write it for you, if you get stuck on a particular aspect of it, then we'll be more than happy to help.

Suspicious | :suss: Email: theeclypse@hotmail.com URL: http://www.onyeyiri.co.uk
"All programmers are playwrights and all computers are lousy actors."

Paul Riley7-Sep-02 13:16

7-Sep-02 13:16

You could have a web service that you send the current version and if it has something more recent, it can send you the URL to the files you need.

Paul

Paul Ingles8-Sep-02 0:56

Paul Ingles

8-Sep-02 0:56

I did find example code for an Automatic Updater on GotDotNet.com once, although I've since lost the URL and couldn't find it last time I looked.

It was a good solution though, and used a web service to provide details about the latest versions of components etc.

--
Paul
"I need the secure packaging of Jockeys. My boys need a house!"
- Kramer, in "The Chinese Woman" episode of Seinfeld

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Sonork: 100.22446

ez28-Sep-02 6:42

ez2

8-Sep-02 6:42

Here is the webpage running on gotdotnet regarding an updater component
http://www.gotdotnet.com/team/windowsforms/appupdater.aspx

Paging in DataGrid?

leppie7-Sep-02 7:04

leppie

7-Sep-02 7:04

Can some please explain how the "auto" paging option of the DataGrid web control is meant to work?

My datasource is a class derived from CollectionBase. Now the first page shows up fine, but when I click any other page number, nothing happens, the page does not display anything but the first page. The event gets fired as well, but that seems only of use when you want to do custom paging.

Wasnt there an ASP.NET forum on CP?

Cheers Smile | :)

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Re: Paging in DataGrid?

Paul Riley7-Sep-02 8:15

7-Sep-02 8:15

You still need to handle the event, even when it's automatic. All you actually need to do in that event handler is: DataGrid1.CurrentPageIndex = e.NewPageIndex but having to handle it yourself gives you the control to do other things.

For example, if you had an EditCommand column in the datagrid and someone hits edit on the fourth row, then pages to the next page, the EditItemIndex is still going to be set to 4, so you need to set it back to -1 in the PageIndexChanged event.

Paul

Re: Paging in DataGrid?

leppie8-Sep-02 1:30

leppie

8-Sep-02 1:30

Thanx Paul

You forget to mention though to do another DataGrid.DataBind().

Its all fine now Smile | :)

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Re: Paging in DataGrid?

Paul Riley8-Sep-02 1:39