Re: Stretching a polygon side in C# - C# Discussion Boards

Re: Select ListView Item on KeyPress

John Fisher20-Sep-05 9:27

John Fisher

20-Sep-05 9:27

Don't have an article for you, but here is a basic implementation description:

Handle the KeyDown event for the appropriate control.
  If the last key press was not within the timeout period,
    then clear the "keys pressed" buffer (maybe a string builder).
  Add the typed key to your "keys pressed" buffer.
  Reset the keydown timer to the current time.
  Perform your comparison to select the appropriate item.

Selecting an item is very straightforward, so that shouldn't be much of a problem. If you're not sure how to do the comparing, you can do it easily by looping through the items list and comparing the substrings manually.

John

"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.

-- modified at 15:28 Tuesday 20th September, 2005

Re: Select ListView Item on KeyPress

miah alom20-Sep-05 9:40

miah alom

20-Sep-05 9:40

Thanks for your reply. This should work.

Re: Select ListView Item on KeyPress

Abdullah_Hunzai22-Oct-09 20:00

Abdullah_Hunzai

22-Oct-09 20:00

I've the same issue, did you implemented the Algo to search a specific item on keys down, if so kindly guide me!!

Abdullah

Stretching a polygon side in C#

20-Sep-05 3:52

Hi,

I am drawing a three sided polygon. I declared a ArrayList variable. On mousedown i am capturing points and adding the same to Arraylist variable.

After that i am drawing lines by reading points from the Arraylist variable.
while drawing the lines i am setting the lastline lastpoint to the nextline firstpoint.

My lastpoint and firstpoint will be same meaning when i am closing the polygon i am drawing line from the thirdpoint to fourthpoint(which is same as firstpoint).

I am trying to drag the secondpoint and thirdpoint. that works fine. but if i position the mouse on the firstpoint and if i tried to drag it is not stretching by combiningthe firstline and lastlines together instead only the firstline is getting dragged.

Can anyone help me.

Thanks in advance, Beginner

Beginner

-- modified at 9:53 Tuesday 20th September, 2005

Re: Stretching a polygon side in C#

Yoyosch20-Sep-05 4:06

Yoyosch

20-Sep-05 4:06

What classes are you using exactly? CsGL?

Re: Stretching a polygon side in C#

subramanyeswari20-Sep-05 17:43

subramanyeswari

20-Sep-05 17:43

I am using system.Drawing and System.Drawing.Drawing2D libraries.

Regards

Re: Stretching a polygon side in C#

Andy Moore20-Sep-05 18:15

Andy Moore

20-Sep-05 18:15

Take a look at the System.Drawing.Drawing2D.GraphicsPath class. You can do something like this:

System.Drawing.Point pts[] = new Point[3];<br />
System.Drawing.Drawing2D.GraphicsPath gp = new System.Drawing.Drawing2D.GraphicsPath();<br />
<br />
gp.AddPolygon( pts );<br />
gp.CloseFigure();<br />

According to which points you select and drag, you would need to recompute the points in the pts[] array then regenerate the GraphicsPath.

I hope this helps.

Human beings were not meant to sit in little cubicles staring at computer screens all day, filling out useless forms and listening to eight different bosses drone on about about mission statements. -- Peter Gibbons

Re: Stretching a polygon side in C#

subramanyeswari21-Sep-05 17:30

subramanyeswari

21-Sep-05 17:30

It worked
thanks

Visual Studio tools for Office

Giannis Zetas20-Sep-05 3:15

Giannis Zetas

20-Sep-05 3:15

I tried to to test code example to add control to a worksheet but when i try to run it i receive the message "Old format or Invalid Library". Where is the problem ???
I upgrade office from XP office and i install "Visual Studio tools fr office. The version of VS is 2003.

Giannis

Re: Visual Studio tools for Office

NassosReyzidis20-Sep-05 3:31

NassosReyzidis

20-Sep-05 3:31

Kalispera file Gianni,

when you said that you upgrade Office, what version, i had the same problem a wile ago and when i upgrade to Office 2003 the problem was solved.
hope that helps
Nassos

GanDad

Programmatically showing and hiding a scollbar in a multiline textbox

Dan Neely20-Sep-05 3:07

Dan Neely

20-Sep-05 3:07

Is this possible?

The default is a visible, but grayed out scrollbar.

There doesn't appear to be a way to define this behavior using properties, and the textbox.Lines.Length property returns the number of logical lines, not the number that are/would be displayed due to word wrapping.

override Paint method for DataGrid

zaboboa20-Sep-05 2:52

zaboboa

20-Sep-05 2:52

Hello, I have this simple Paint method for my datagrid:

protected override void Paint(System.Drawing.Graphics g, System.Drawing.Rectangle bounds, CurrencyManager source, int rowNum, System.Drawing.Brush backBrush, System.Drawing.Brush foreBrush, bool alignToRight) <br />
       { <br />
          DataRowView view = (DataRowView) source.Current;<br />
          System.Drawing.Color myColour = Color.White;<br />
          numberFormatInfo = new NumberFormatInfo();<br />
	      numberFormatInfo.CurrencySymbol = "$";<br />
	      numberFormatInfo.NumberDecimalDigits = 0;<br />
	      numberFormatInfo.CurrencyDecimalDigits = 0;<br />
	      numberFormatInfo.CurrencyNegativePattern = 1;<br />
          <br />
          string[] str = view.DataView.Table.Rows[rowNum]["IndentLevel"].ToString().Split('~');<br />
          <br />
// HERE IS THE PROBLEM--------<br />
/*<br />
          if (rowNum < 4) {<br />
             this.Format = "n";<br />
             this.FormatInfo = numberFormatInfo;<br />
          } else {<br />
             this.Format = "c";<br />
             this.FormatInfo = numberFormatInfo;<br />
          } <br />
          */<br />
          <br />
          <br />
          <br />
          // --- Main Heading ---<br />
          if (str.Length == 1) {<br />
             myColour = Color.Coral;<br />
          } else if (str.Length == 2) {<br />
             // --- Sub Headings ---<br />
             if (str[1] == "1" || str[1] == "4") {<br />
                myColour = Color.PaleGoldenrod;<br />
             // --- Net Sum Headings ---<br />
             } else if (str[1] == "7") {<br />
                myColour = Color.Lavender;<br />
             // --- Other Headings ---<br />
             } else {<br />
                myColour = Color.Wheat;<br />
             }<br />
          // --- Populated Rows ---<br />
          } else if (str.Length == 3) {<br />
             myColour = Color.SeaShell;<br />
          } else {<br />
             myColour = Color.Thistle;<br />
          }<br />
		  <br />
		  // ----------------------------<br />
		  // ------ Paint the Row -------<br />
		  // ----------------------------<br />
          try{ <br />
             backBrush = new SolidBrush(myColour); <br />
          } <br />
          catch(Exception) {} <br />
          finally {<br />
             base.Paint(g, bounds, source, rowNum, backBrush, foreBrush, alignToRight); <br />
          } <br />
       }

So, the commented out portion couses the datagrid to flicker, if it is inserted in the code, and other controls like buttons, etc.. don't show up on the form, unless you move the form. If it's commented out, everything is working smooth and fine. Any ideas?

Thank you

Dialog box exit

baronics20-Sep-05 2:37

baronics

20-Sep-05 2:37

I have a modal dialog box with AcceptButton & CancelButton

Is there a way to test if the dialog was closed with the user pressing 'Enter' as apposed to using the mouse to click either of the buttons or the control box?

MyDialog dlg = new MyDialog();
DialogResult rc = dlg.ShowDialog();
if(dlg.wasEnterPressed()) ...

The 'Click' event on the AcceptButton fires for both mouse & keypress.
I tried to look at the KeyDown event but that doesn't fire when 'Enter' is pressed.

Re: Dialog box exit

Ashok Dhamija20-Sep-05 3:22

Ashok Dhamija

20-Sep-05 3:22

As you have an AcceptButton, it appears that the Click event of the OK button precedes the KeyDown event for the Enter key and kills the dialog box before the KeyDown event fires. Try NOT declaring the AcceptButton and then see whether the KeyDown event fires for the Enter key.

Regards,
Ashok Dhamija
_____________________________
Padam Technologies

Re: Dialog box exit

baronics20-Sep-05 4:58

baronics

20-Sep-05 4:58

Thanks.

The solution I went with was to add:

protected override bool ProcessCmdKey(ref System.Windows.Forms.Message m, Keys k)
{
if(k == Keys.Enter)
bEnterPressed = true;

return false;
}

C# ,Directx and MPEG2 encoding

Member 242731820-Sep-05 2:33

Member 2427318

20-Sep-05 2:33

Hi,
my team is trying to develope an capture tool in c#.Net. It should have follwing fuctionalities......
1) can capture From dv-avi (camcoder) to MPEG2 directly

2)while capturing the date and time information (which was in raw format ) is lost. We want that information to persist in MPEG2 format

can u pls help or guide me to do this..coz i m very new to C#.Net programing... Confused | :confused:

Overhead Representation

PHDENG8120-Sep-05 1:24

PHDENG81

20-Sep-05 1:24

I need a Cyclic Visual for a form I am developing. A cyclic is the control in a helicopter that the pilot usings to steer the aircraft. What I need is an overhead view of the position of the cylic. I.e. a circle with maybe a dot or something indicating its position. Any help would be much appreciated. Thanks

D

D

Re: Overhead Representation

Anonymous20-Sep-05 4:46

Anonymous

20-Sep-05 4:46

I don't you'll find one for this specialized of a purpose. You'll have to write your own control to do this.

Re: Overhead Representation

Anonymous20-Sep-05 4:46

Anonymous

20-Sep-05 4:46

I don't think you'll find one for this specialized of a purpose. You'll have to write your own control to do this.

Capturing Frames from a AVI File

Balasubramanian_198020-Sep-05 1:00

Balasubramanian_1980

20-Sep-05 1:00

Hi,
I have a project in which i have to load a avi file and capture x number of frames (viedo only) from it and save in a web compatible format (JPEG , GIF) , also this needs to be done as a back-end process with the front end being ASP.Net . Can any one help ?

I have browsed through the samples here but they deal with capturing from a video source(web cam, tv etc) and not from a avi file. This means they are also very difficult to comprehend as i am not a experienced programmer. So I am hoping for a simpler solution to this , a simpler problem !

Thanks

balien

Re: Capturing Frames from a AVI File

Andrew Kirillov20-Sep-05 2:17

Andrew Kirillov

20-Sep-05 2:17

Hello

You should search more deeply. Look at my article "Motion Detection Algorithms" [^]. You can find there a small interop library for AVI reading using Video for Windows.

You can try to interop DirechShow also, or to use managed extension of DirectX 9.

With best regards,
Andrew

Re: Capturing Frames from a AVI File

Andrew Kirillov20-Sep-05 3:42

Andrew Kirillov

20-Sep-05 3:42

By the way, here is another article[^], which is fully dedicated to AVI's using C#.

With best regards,
Andrew

Header / Detail in c#

dabuskol20-Sep-05 0:48

dabuskol

20-Sep-05 0:48

Hi,

I created a web application in c# to create a record with attachment. While creating a new record I have an option to create an attachment on a separate window? What I am doing is once the user click the attachment button I automatically create a header record then from the new window upon saving the attachment I created the detail information using a temporary primary key. When its time to save and press the SUBMIT button, I update the primary key to a standard primary key that is readable to the users.

Please tell me if what I am doing is correct, or if you have any suggestion on how implement in a correct way.

DRAWBACK: After pressing the attachment button (It means I create a header record) the user will change his mind an abort everything that he is doing and just close the window. I will have 1 record from the database (garbage).

/Dabuskol

Form Controls

deepscyberpulse20-Sep-05 0:24

deepscyberpulse

20-Sep-05 0:24

Is it possible to identify which control is on a form. For example can i return a string which saya that there is a textbox control on a form, etc.

Re: Form Controls

NanaAM20-Sep-05 0:58

NanaAM

20-Sep-05 0:58

Use FindControl method

HVP

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.