Re: how to scale webpage? - C# Discussion Boards

Changing regional options in c#.net

14-Sep-06 3:27

Gee!! Thanks for your reply! Laugh | :laugh:

Only one problem is that it wasn't me who asked the question!!;P
He won't get a notification of your reply if you replied to me. Repost your reply by replying to his original post.

Regards

RanjithLogics13-Sep-06 5:14

RanjithLogics

13-Sep-06 5:14

How can I change my system's Regional options (I want to change it to English-United states and also the datetime/currency formats) using c# code. If any one knows plz reply...urgent Frown | :-(

Thanks in advance

Ranjith Stephen

Nader Elshehabi13-Sep-06 6:12

13-Sep-06 6:12

Hello

I believe it's possible, yet not preferable!! Why, I won't like it at all if i install a program that misses up with my system's configuration. I'd start wondering what else did that program do in my system. Probable, I'd uninstall it immediately and make a system restore.

The real question isn't how. It's why?? Why would you want to do such thing?

My guess is that you are facing some trouble with the Date/Time or currency/numbers formatting, Right-To-Left issues and things like that. Post some details of your real problem, and maybe we can work it out, as changing the system's configuration to suit your formatting isn't the solution.

Regards

RanjithLogics13-Sep-06 18:02

RanjithLogics

13-Sep-06 18:02

Hii thanx for ur reply. Bu t the thing is that I am modifying an existing appplication. There is a lot of calculations and using a lot of constants ( from ini files and hard coded strings .. etc). Moreover the application will be running in a dedicated system and there is no question of restoring it.

I searched for API s which enables me changing the settings but i couldnt find any Frown | :-(

Do you know any ???

thanks and Regards

asdasd

Nader Elshehabi14-Sep-06 3:38

14-Sep-06 3:38

Hello
You can't change the systems locale perminantly using any API -it would take much more than that to hack into windows restricted settings-. Anyway you can make a workaround it by changing the locale to your app's session only. Check Win APi SetLocaleInfo() function.

Regards

Re: how to scale webpage?

RanjithLogics19-Sep-06 23:44

RanjithLogics

19-Sep-06 23:44

Hey It is possible..I mean no need to change the systems settings, but the application enviornment as you said .

Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo("en-US" , true);

will set the application settings into en-US , and our application will work in en-Us format

Thanx
Ranjith Stephen

asdasd

how to scale webpage?

zhoujun13-Sep-06 5:05

zhoujun

13-Sep-06 5:05

I mean for example when I use webbrowser control,set the control size 400X300,then navigate the webbrowser to a webpage,and the whole page is displayed in the control,but have scrollbars,so can i scale or shorten the whole page to 400X300.
I hope you know my meanings.
Thanks.

My Blog:August 12,2006,Rhythm of The Rain.

Nader Elshehabi13-Sep-06 7:41

Uninstall using command prompt

13-Sep-06 7:41

Hello

I've never seen in before in any browser -this zomming/fit page thing- so I don't think It's avaible directly in the WebBrowser control.

I guess you'd have to make you own Browser object that parses HTML and displays it accordingly. Won't be easy though.

Regards

get my IP

Green Fuze13-Sep-06 5:00

Green Fuze

13-Sep-06 5:00

Hey everybody Smile | :)

!

I'm trying to find a way to get my IP.
I'm pretty sure there is a method for that in the libraries, so I thought maybe someone wouldn't mind to share that information Smile | :)

.

Thanks.

Re: get my IP

Obaid ur Rehman13-Sep-06 5:44

Obaid ur Rehman

13-Sep-06 5:44

Very simple, Try this:

<br />
  IPHostEntry host = Dns.GetHostByName(Dns.GetHostName());<br />
  foreach (IPAddress address in host.AddressList) <br />
  {<br />
      Console.WriteLine("IP Address: {0}", address.ToString());<br />
  }<br />

You must include the System.Net namespace as well.

Re: get my IP

Green Fuze13-Sep-06 5:59

Green Fuze

13-Sep-06 5:59

Thanks

its working perfectly! Smile | :)

by the way, just one more thing, is there a way to tell if the IP I'm getting is the internet IP? (if I have more than one), or do I have to find something (like checking the first number of the IP address)?

Re: get my IP

User 665813-Sep-06 6:15

User 6658

13-Sep-06 6:15

You might check if it's in the valid range of non-network IPs

Alternatively, you could send a HttpWebRequest to http://www.whatismyip.com/
If it succeeds then you can parse the IP. If it does not, you might still want to check method 1

regards

modified 12-Sep-18 21:01pm.

kulile13-Sep-06 4:57

kulile

13-Sep-06 4:57

Good day

Im tring to uninstall an application using command prompt. After it has uninstalled, it must not show on the Add/Remove Programs folder. Can anyone help me.

Thank you in advance

Kulile --- RSA

MessageBox Text

numbers1thru913-Sep-06 4:43

numbers1thru9

13-Sep-06 4:43

Is there a way to center text in a message box? Its left aligning it and Id rather have it centered if there is a way.

Re: MessageBox Text

Glen Harvy13-Sep-06 4:59

Glen Harvy

13-Sep-06 4:59

The text must be centered if the box grows to fit the text Smile | :)

You can use \n if you want CR's and manually "box" lengthy text that way.

Glen Harvy

Can a Math genius please help me!? [modified]

srev13-Sep-06 4:26

srev

13-Sep-06 4:26

Hi Guys,

I’m creating an animation program and have built a Bezier spline motion editor. The user-controllable curve plots time(x) against value(y). So my challenge is to retrieve the 'y' value from a given 'x' on the curve. However, all the articles I've been able to find/understand only give a formula for calculating an x or y from 't' - the percentage along the given cubic bezier curve.

As 't' is more concentrated around areas which heavily curve (to make a smooth curve), it's not possible to calculate y from x. So I'm using what seems to be a recognised work around and iteratively guessing at which 't' value produces x, continually reducing the difference until I find the correct 't' which produces my required x. I then use this 't' to calculate y.

This all works perfectly well. However, this is an animation program so I need to optimize this process. My current technique requires up to 15 iterations before it finds an accurate value for 't'. I found an article online by Don Lanaster, “Some more cubic spline math BEZMATH.PS”. He mentions using the Newton-Raphelson method to reduce this process down to 3 iterations. Apparently this technique uses the slope of the curve to make the approximation of 't' more accurate. However, the formula he uses doesn't match the formula I currently have working to calculate a value on the curve. I'm sure I'm misunderstanding it!

At this point I have to confess I am a Math dummy. I can work my way around practical mathematical issues as long as I don’t have to resort to long formulas full of ancient Greek!

Here's an extract from Don's article:

--- Quote ----
Let's use a better ploy to get our approximation to close quickly. It is called the NEWTON-RAPHELSON method, but is much simpler than it sounds. Say we get an error of x - x1. x1 is the current x for our current guess. At x1, our spline curve has a slope. Find the slope.

The slope is expressed as rise/run. Now, on any triangle...

rise = run x (rise/run)

This gives us a very good improvement for our next approximation. It turns out that the "adjust for slope" method converges very rapidly. Three passes are usually good enough. If our curve has an equation of...

x = At^3 + Bt^2 + Ct + D

...its slope will be...

x' = 3At^2 +2Bt + C

And the dt/dx slope will be its inverse or 1/(3At^2 + 2Bt +C). This is easily calculated. The next guess will be...

nextguess = currentt + (curentx - x)(currentslope)

----- end quote ----

So here's the function I call iteratively with varying values for 't' and it returns 'x' for me to compare with what I want:

public float CalcBezierValue(float t, float A, float B, float C, float D)
{
t = 1 - t; // Reverse the normalised percentage

float F1 = t * t * t; // These vars used purely for visual clarity
float F2 = 3 * t * t * (1 - t);
float F3 = 3 * P * (1 - t) * (1 - t);
float F4 = (1 - t) * (1 - t) * (1 - t);

return A * F1 + B * F2 + C * F3 + D * F4;
}

As you can see the base formula which produces the return value is quite different from the one in the article (x = At^3 + Bt^2 + Ct + D). Consequently I’m failing to comprehend how to calculate the slope value or its inverse which seem to be required to reduce the number of calls to this function.

Can anyone help me?

Many thanks for your time,

Simon

-- modified at 12:02 Wednesday 13th September, 2006

papa8013-Sep-06 5:40

papa80

13-Sep-06 5:40

You choose wrrong forum brother try it in google groups but math

when i want to read something good just seat and type it

srev13-Sep-06 6:21

srev

13-Sep-06 6:21

Thanks for the tip. I've posted on there too.

Guffa13-Sep-06 6:49

Guffa

13-Sep-06 6:49

Perhaps you should look for a better source of information. There is no such thing as "the Newton-Raphelson method".

If you search for information about the Newton-Raphson method[^], you might have better luck.

---
b { font-weight: normal; }

Ed.Poore13-Sep-06 6:50

Ed.Poore

13-Sep-06 6:50

There is a Maths forum here as well.

As of how to accomplish this, have you ever tried Google?
Failing that try Badger | [badger,badger,badger,badger...]

want to implement zoom operations in C#

srev13-Sep-06 23:43

srev

13-Sep-06 23:43

Guys,

Thanks so much for everyone's feedback. From all the feedback on this and other forums I have the answer.

The function CalcBezierValue() computes the cubic Bézier curve as the polynomial:
x = A*t^3 + 3*B*(t^2)*(1-t) + 3*C*t*(1-t)^2 + D*(1-t)^3

To use the technique in the article I need the derivative:
x' = 3*A*t^2 + 6*B*t*(1-t) - 3*B*t^2 + 3*C*(1-t)^2 - 6*C*t*(1-t) - 3*D*(1-t)^2

The final code looks like this:

// Calc the derivative value of the curve at the specified percentage (rather than the polynomial)
public float CalcBezierDerivative(float P, float A, float B, float C, float D)
{
P = 1 - P; // Reverse the normalised percentage

float tR = 3 * A * (P * P);
float tS = 6 * B * P * (1 - P);
float tT = 3 * B * (P * P);
float tU = 3 * C * ((1 - P) * (1 - P));
float tV = 6 * C * P * (1 - P);
float tW = 3 * D * ((1 - P) * (1 - P));

return tR + tS - tT + tU - tV - tW;
}

Many thanks for all your responses.

Simon

kalaveer13-Sep-06 4:23

kalaveer

13-Sep-06 4:23

i want to implement zoomin opertion in C# for that i used picturebox control which is contained in a panel control but in mouse click event of picturebox i just increased the height and width of the picturebox so its just moving right even i set the autoscroll of panel control and its autoscrollposition to point containing e.x,e.y but its not working perfectly.
so now i want to position the picturebox image where i clicked, after the zooming effect applied the zoomed area should be shown so pls if any body knows help me or otherwise is there any method to implement zoom operations with the controls i used or with any other way pls help that is important and urgent.
thanx in advance.

Re: want to implement zoom operations in C#

Nader Elshehabi13-Sep-06 7:36

Re: want to implement zoom operations in C#

13-Sep-06 7:36

Hello

1- Take the X, and Y coordinates in the MouseUP event handler relative top the current width, and height of your picturebox
2- use a graphics object to scale the image, ie. mygraphics.ScaleTransform() giving the X, and Y zooming factors.
3- Use the same Graphics object to draw the image to the picturebox.image.

Regards

kalaveer13-Sep-06 19:11

kalaveer

13-Sep-06 19:11

thanx for u r response, i tried what ever u sent but it didn't work. I don't know why image is remain same after writing the code in mouseup event of picturebox also, and i have one more doubt that the control used in some applications and elsewhere to perform zoom operations is picturebox or anything else ? but pls help me to perform the zoomoperations
thanks once again in advance.

Re: want to implement zoom operations in C#

Nader Elshehabi14-Sep-06 1:40