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Howto write text into a picturebox on runtime

13-Jul-09 13:27

Forgot to mention, there are several patterns that generalize and formalize this.
Google for MVC (model-view-controller) and MVP (model-view-presenter).
I haven't fully understood them yet. IMO my Command classes are a pragmatic subset of MVC.

Smile | :)

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NewJavaBean13-Jul-09 11:34

13-Jul-09 11:34

Hi,
i try to build a user interface like Paint, or a primitive kind of it.
It should be possible to click onto a picturebox and write something to that location.

I don't know where and when to initialise the textbox-object. Before runtime and just "activate" it when text is written, or dynamical if needed?
What is the best appoach to realise that the user can just click onto the picturebox (if the PrintText button was pressed) and get a curser where the text can be written.

Hopefully somebody can help.

Bye,
Michael

Luc Pattyn13-Jul-09 11:54

13-Jul-09 11:54

Hi,

just throwing Controls on top of each other won't cut it. If you want to create a paint program, using several controls is not the way to go. You really need:
- a single control that shows it all; I would use a simple Panel;
- a data structure that holds all the different objects that constitute your artwork; you might want to define a DrawableItem class, and derive specific objects from that; then collect them in a List<DrawableItem>
- a Paint handler that paints everything in the list;
- some Mouse handlers to click and selects DrawableItems so you can move, resize, delete them.
- etc.

Have a look at some of the paint articles here on CP, or Google for Paint.NET

Smile | :)

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NewJavaBean13-Jul-09 12:20

13-Jul-09 12:20

Thanks for your post.
To be more specific: it's a program to transformate and tesselate a picturebox. The design of this picturebox is just the first step.
I already use a class to manage all the different objects. In this class i have a list of GraphicsPath Objects, each connected to a pen which was used for this object.
Painting freehand-curves, regular shapes and other stuff works fine, but i don't get how to deal with the dynamic textbox.

I take a look at the paint articles, but i've already searched google with all keywords -suitable to this issue- i could think of.

Luc Pattyn13-Jul-09 12:34

13-Jul-09 12:34

Of course, you might choose to use a TextBox for inputting the text. But once the string becomes part of the artwork, the text is just a drawable item like the rest of them. Whether you use Graphics. DrawLine() or Graphics.DrawString() doesn't make any difference.

Smile | :)

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NewJavaBean13-Jul-09 12:42

13-Jul-09 12:42

Thats fine. I want to save it as a GraphicsPath-textobject anyway and handle it like all the other graphic objects.
But how to put the dynamic text into the pb? You see where my prob is?

Luc Pattyn13-Jul-09 12:49

13-Jul-09 12:49

NewJavaBean wrote:
You see where my prob is?

Not really. How do you draw a vertical line? how do you draw a rectangle? the only thing a PictureBox helps you to achieve is showing a single, full-sized image. Everything else needs code in the Paint handler, so why not do it all yourself, in the Paint handler of the Control you choose (I choose Panel instead of PictureBox).

Smile | :)

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NewJavaBean13-Jul-09 13:03

13-Jul-09 13:03

Ok i see

Lets rephrase myself. I'm not sure how to interact with the user.
It should be this way:
User activates the button to draw some text.
User clicks onto the PictureBox and a cursor displays at this point.
User writes a line.

After this point i sould handle it, but how to get there?

Do i actually need a textbox or should i try it another way?

Luc Pattyn13-Jul-09 13:24

13-Jul-09 13:24

That is entirely up to you. Here are some possibilities; they all share a "trigger", i.e. something telling your app that text is going to be added (could be a button, menu item, whatever):

1. have the user click on the PB, then hit the trigger; now create a dynamic textbox and add it to PictureBox.Controls giving it the clicked location. Enter the text, upon ENTER read the text, remove the TB from the Controls, add the text to the drawing.
2. without a TB: have the user click on the PB, then hit the trigger; now, let him type text and add it immediately to the drawing until he terminates with ENTER. Here you don't have a cursor, no copy/paste, and you need to support backspace/delete for editing. Is probably more visually pleasing though, as you see the results immediately.
3. with a static TB outside the PB.
4. with a text entry dialog.

1. uses the trigger event, and the TB.KeyDown event to check for ENTER.
2. uses the trigger event, and the PB.KeyPress event (for text) and PB.KeyDown event (for ENTER).

BTW: Once more, I would use a Panel, not a PB.

Smile | :)

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NewJavaBean13-Jul-09 14:53

13-Jul-09 14:53

Thanks Luk thats what i wanted to know.
So i have to create the TexBox by my own, what usually the Designer does for me, and destroy it afterwards.

And i've heard you with the panel Wink | ;)

But this is a group project and we've got more than one PB in the program.
The other students would probably kill me if i change such major things in this state of the project.

So now im gonna sleep, its late.
Good night... or day, according to your local timezone Smile | :)

Thanks again!

Christian Graus13-Jul-09 14:25

PathGradientBrush and irregular shapes

13-Jul-09 14:25

NewJavaBean wrote:
i try to build a user interface like Paint, or a primitive kind of it.

I did not read all this thread, but at the core, a picturebox is an absolute waste of time here, and can make things harder. Handle your own paint event and go from there.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

JimLaVine13-Jul-09 10:54

JimLaVine

13-Jul-09 10:54

Given a shape that has the form of an "L", does anyone know how to render a gradient border that follows the shape of the "L"?

Re: PathGradientBrush and irregular shapes

Christian Graus13-Jul-09 10:59

Re: PathGradientBrush and irregular shapes

13-Jul-09 10:59

You would do two gradients, or do one that radiates from the bottom right, so that it follows both lines in the L. A more complex letter would be a lot harder, obviously.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

Luc Pattyn13-Jul-09 11:25

Re: PathGradientBrush and irregular shapes

13-Jul-09 11:25

Hi,

my experience with PathGradientBrush is limited to a simple case[^], however I would say you should provide intermediate points and colors in any way that suits you.

Smile | :)

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Henry Minute13-Jul-09 12:02

Henry Minute

13-Jul-09 12:02

You might want to take a look at Rich Design Time Editing with UITypeEditors (VB.NET)[^], as you can see from the title its primary target is TypeEditors, but it demonstrates this by using various fills and paths. It is in VB.Net, hope that is not a problem.

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

getting specific string error? [modified]

maifs13-Jul-09 10:46

maifs

13-Jul-09 10:46

i want to fetch the characters from file for example :

1st example:

// mehmood// hello ,how r u?

just within comments and replace it to all caps

2nd example:

/* hi
mehmood
ahmed */

i want to fetch the characters within sigle line comment and multi line comments .

just within comments not outside the comment.

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

i am trying this code, kindly correct my code:

FileStream fs = new FileStream(path, FileMode.Open, FileAccess.Read, FileShare.Read);

           StreamReader sr = new StreamReader(fs);
           int countComment=0;
           while(sr.Peek() >= 0 )
           {
               str =sr.ReadLine();
               strTemp = new char[str.Length];
              #region From String method
               int count=0;
               for (int i = 0; i < str.Length; i++)
               {
                   if (str[i] == '/')
                   {
                       ++countComment;
                       count=i;
                   }
                   if (char.IsLetterOrDigit(str,count+1) && countComment==2)
                   {
                       strTemp2 += str.Substring(count+1).ToUpper();
                   }

               }
               #endregion


               countComment = 0;
               this.textBox2.Text += strTemp2 + Environment.NewLine; ;
               this.textBox1.Text += str + Environment.NewLine;
           }
           sr.Close();
           fs.Close();

it generates an exception :

System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.
Parameter name: index

Maifs

modified on Monday, July 13, 2009 5:08 PM

Re: getting specific string error?

Luc Pattyn13-Jul-09 10:57

Re: getting specific string error?

13-Jul-09 10:57

Hi,

you need to debug your code, and you should do that yourself.
Here are some hints:
- an exception contains a message and a stack traceback indicating class and method names, file names, and line numbers (when available; use debug mode!)
- when you try-catch an exception, make sure to show the ENTIRE exception, use Exception.ToString()
- teach your IDE to always show line numbers in editor windows; for Visual Studio, look under menu Tools/Options/TextEditor/AllLanguages

and if you must show us some code please use PRE tags (that's under the "code block" widget above the text edit box)

Smile | :)

Luc Pattyn [Forum Guidelines] [My Articles]

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Christian Graus13-Jul-09 10:57

Graphics.MeasureString accuracy

13-Jul-09 10:57

Issues

1 - the code is a mess
2 - it won't work
3 - it's hard to read

Do you not know how to use the debugger ? The error message is telling you what is wrong, what is the issue ?

maifs wrote:
if (char.IsLetterOrDigit(str,count+1) && countComment==2)
{
strTemp2 += str.Substring(count+1).ToUpper();
}

Why do you use -1 AND +1 ? What if +1 is out of range ( wait, isn't that what the error message says ? )

This needs a lot of work. I'd read a C# book to learn some basics, then rewrite it using regex and the split method of the string class.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

tasoss13-Jul-09 10:16

tasoss

13-Jul-09 10:16

Hello.
I'm using

Graphics gr = Graphics.FromHwnd(IntPtr.Zero);
(int)gr.MeasureString(xrt.Rows[x].Cells[y].Text, xrt.Rows[x].Cells[y].Font).Width;

But as you can see http://img156.yfrog.com/img156/3585/measurestring.jpg it doesn't work as i would like.
Can you please advice me so i can increase its accuracy?
Thank you in advance!

Christian Graus13-Jul-09 10:39

13-Jul-09 10:39

What's wrong with it ? Also, you can't make it more accurate than it is. I am sure it is accurate, it always has been for me.

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

tasoss13-Jul-09 10:47

tasoss

13-Jul-09 10:47

Hello and thanks for replying.
Well "personal information" is not in the same line.Moreover "Orders table" "for each order" etc.
I would like them to be in the same line and not wordwraped.

Christian Graus13-Jul-09 10:58

13-Jul-09 10:58

Every time it wraps, it's because there's not enough room to fit them. If the column has been sized to the biggest string ( you don't actually tell us what you do with it ), then perhaps you just need to add a few pixels ?

Christian Graus

Driven to the arms of OSX by Vista.

Read my blog to find out how I've worked around bugs in Microsoft tools and frameworks.

tasoss13-Jul-09 11:58

tasoss

13-Jul-09 11:58

Thanks for the replies.Well i just want to fit the text exactly inside the cells(table cells).I create a table(control provided) and set text inside its cells.Then i process all the cells and try to set the correct width(using measurestring).
How will i know that more pixels are needed to be added?
I will try the links provided but i don't know if they fit in my occasion.
Thanks again people.

Luc Pattyn13-Jul-09 10:46