Basically it&#39;s if you want to adjust multiple layout-related properties - or add multiple children - but avoid the layout system repeatedly reacting to your changes. You want it to *only* perform the layout at the very end, when everything&#39;s &quot;ready&quot;.

For an application I am building I have drawn 2 circles. One a bit bigger than the other. I want to curve text between those lines, for a circular menu I am building.

I read most stuff about curving a text that you have to split up your text in characters and draw each character on it&#39;s own with the right angle in mind (by rotating the context you are drawing on).

I just can&#39;t wrap my head around on how to get the right angles and positions for my characters.

I included a screenshot on what the menu, at the moment, look like. Only the texts I added by are loaded from an image in an UIImageView.

![alt text][1]


I hope someone can get me some starting points on how I can draw the text in the white circle, at certain points.

EDIT:
Ok, I am currently at this point:

![alt text][2]

I accomplish by using the following code:

    - (UIImage*) createMenuRingWithFrame:(CGRect)frame
    {
    	CGRect imageSize = CGRectMake(0,0,300,300);
    	float perSectionDegrees = 360 / [sections count];
    	float totalRotation = 90;
    	char* fontName = (char*)[self.menuItemsFont.fontName cStringUsingEncoding:NSASCIIStringEncoding];
    
    	CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        CGContextRef context = CGBitmapContextCreate(NULL, imageSize.size.width, imageSize.size.height, 8, 4 * imageSize.size.width, colorSpace, kCGImageAlphaPremultipliedFirst);
    
    	CGContextSetTextMatrix(context, CGAffineTransformIdentity);
    	CGContextSelectFont(context, fontName, 18, kCGEncodingMacRoman);
    	
    	CGContextSetRGBFillColor(context, 0, 0, 0, 1);
    	
    	CGPoint centerPoint = CGPointMake(imageSize.size.width / 2, imageSize.size.height / 2);
    	double radius = (frame.size.width / 2);
    	
    	CGContextStrokeEllipseInRect(context, CGRectMake(centerPoint.x - (frame.size.width / 2), centerPoint.y - (frame.size.height / 2), frame.size.width, frame.size.height));
    	
    	for (int index = 0; index &lt; [sections count]; index++)
    	{
    		NSString* menuItemText = [sections objectAtIndex:index];
    		CGSize textSize = [menuItemText sizeWithFont:self.menuItemsFont];
    		char* menuItemTextChar = (char*)[menuItemText cStringUsingEncoding:NSASCIIStringEncoding];
    		
    		float x = centerPoint.x + radius * cos(degreesToRadians(totalRotation));
    		float y = centerPoint.y + radius * sin(degreesToRadians(totalRotation));
    		
    		CGContextSaveGState(context);
    
    		CGContextTranslateCTM(context, x, y);
    		CGContextRotateCTM(context, degreesToRadians(totalRotation - 90));
    		CGContextShowTextAtPoint(context, 0 - (textSize.width / 2), 0 - (textSize.height / 2), menuItemTextChar, strlen(menuItemTextChar));
    		
    		CGContextRestoreGState(context);
    		
    		totalRotation += perSectionDegrees;
    	}
    
    	CGImageRef contextImage = CGBitmapContextCreateImage(context);
    	
    	CGContextRelease(context);
    	CGColorSpaceRelease(colorSpace);
    
        return [UIImage imageWithCGImage:contextImage];
    }

These are the variables I use in there:

    NSArray* sections = [[NSArray alloc] initWithObjects:@&quot;settings&quot;, @&quot;test&quot;, @&quot;stats&quot;, @&quot;nog iets&quot;, @&quot;woei&quot;, @&quot;woei2&quot;, nil];
    self.menuItemsFont = [UIFont fontWithName:@&quot;VAGRounded-Bold&quot; size:18];

The rotation of the words seem correct, the placement also. Now I need somehow figure out at which rotation the letters (and their coordinates) should be. I could use some help with that.

**Edit:** Fixed! Check out the following code!

    - (void) drawStringAtContext:(CGContextRef) context string:(NSString*) text atAngle:(float) angle withRadius:(float) radius
    {
    	CGSize textSize = [text sizeWithFont:self.menuItemsFont];
    	
    	float perimeter = 2 * M_PI * radius;
    	float textAngle = textSize.width / perimeter * 2 * M_PI;
    	
    	angle += textAngle / 2;
    	
    	for (int index = 0; index &lt; [text length]; index++)
    	{
    		NSRange range = {index, 1};
    		NSString* letter = [text substringWithRange:range];		
    		char* c = (char*)[letter cStringUsingEncoding:NSASCIIStringEncoding];
    		CGSize charSize = [letter sizeWithFont:self.menuItemsFont];
    
    		NSLog(@&quot;Char %@ with size: %f x %f&quot;, letter, charSize.width, charSize.height);
    		
    		float x = radius * cos(angle);
    		float y = radius * sin(angle);
    		
    		float letterAngle = (charSize.width / perimeter * -2 * M_PI);
    		
    		CGContextSaveGState(context);
    		CGContextTranslateCTM(context, x, y);
    		CGContextRotateCTM(context, (angle - 0.5 * M_PI));
    		CGContextShowTextAtPoint(context, 0, 0, c, strlen(c));
    		CGContextRestoreGState(context);
    		
    		angle += letterAngle;
    	}
    }
    
    - (UIImage*) createMenuRingWithFrame:(CGRect)frame
    {
    	CGPoint centerPoint = CGPointMake(frame.size.width / 2, frame.size.height / 2);
    	char* fontName = (char*)[self.menuItemsFont.fontName cStringUsingEncoding:NSASCIIStringEncoding];
    
    	CGFloat* ringColorComponents = (float*)CGColorGetComponents(ringColor.CGColor);
    	CGFloat* textColorComponents = (float*)CGColorGetComponents(textColor.CGColor);
    	
    	CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        CGContextRef context = CGBitmapContextCreate(NULL, frame.size.width, frame.size.height, 8, 4 * frame.size.width, colorSpace, kCGImageAlphaPremultipliedFirst);
    	
    	CGContextSetTextMatrix(context, CGAffineTransformIdentity);
    
    	CGContextSelectFont(context, fontName, 18, kCGEncodingMacRoman);
    	CGContextSetRGBStrokeColor(context, ringColorComponents[0], ringColorComponents[1], ringColorComponents[2], ringAlpha);
    	CGContextSetLineWidth(context, ringWidth);	
    
    	CGContextStrokeEllipseInRect(context, CGRectMake(ringWidth, ringWidth, frame.size.width - (ringWidth * 2), frame.size.height - (ringWidth * 2)));
    	CGContextSetRGBFillColor(context, textColorComponents[0], textColorComponents[1], textColorComponents[2], textAlpha);
    	
    	CGContextSaveGState(context);
    	CGContextTranslateCTM(context, centerPoint.x, centerPoint.y);
    	
    	float angleStep = 2 * M_PI / [sections count];
    	float angle = degreesToRadians(90);
    	
    	textRadius = textRadius - 12;
    	
    	for (NSString* text in sections)
    	{
    		[self drawStringAtContext:context string:text atAngle:angle withRadius:textRadius];
    		angle -= angleStep;
    	}
    	
    	CGContextRestoreGState(context);
    	
    	CGImageRef contextImage = CGBitmapContextCreateImage(context);
    	
    	CGContextRelease(context);
    	CGColorSpaceRelease(colorSpace);
    	
    	[self saveImage:[UIImage imageWithCGImage:contextImage] withName:@&quot;test.png&quot;];
        return [UIImage imageWithCGImage:contextImage];
    	
    }



  [1]: http://i.stack.imgur.com/gjgdM.png
  [2]: http://i.stack.imgur.com/eII4O.jpg


Curve text on existing circle

I have a problem with the jQuery-UI datepicker, I have searched and searched but I didn&#39;t find the answer. I have the following code:

    &lt;script type=&quot;text/javascript&quot;&gt;
    $(function() {		         
        $(&quot;#birthdate&quot; ).datepicker({
			changeMonth: true,
			changeYear: true,
            yearRange: &#39;1920:2010&#39;,
            dateFormat : &#39;dd-mm-yy&#39;,
            defaultDate: &#39;01-01-1985&#39;
        });
    });
    &lt;/script&gt;

I want that when the user click in the `#birthdate` input that the current date selected to be `01-01-1985`, now it&#39;s setting the current date.  

jQuery-UI datepicker default date

I am reading up about `SuspendLayout()` and `ResumeLayout()`. What I can&#39;t figure out is, why should I do/use this. I know you use it when you add controls at runtime to a control-container.

It has something to do with setting properties like `Dock`, `Anchor`, `Location`, etc.

But I don&#39;t understand what the additional value is of Suspend- and ResumeLayout(). What does these methods take care for?

C# Why use SuspendLayout()?

I am reading up about <code>SuspendLayout()</code> and <code>ResumeLayout()</code>. What I can't figure out is, why should I do/use this. I know you use it when you add controls at runtime to a control-container.
It has something to do with setting properties like <code>Dock</code>, <code>Anchor</code>, <code>Location</code>, etc.
But I don't understand what the additional value is of Suspend- and ResumeLayout(). What does these methods take care for?

I am a bit confused about overriding vs. hiding a method in C#. Practical uses of each would also be appreciated, as well as an explanation for *when* one would use each.

I am confused about overriding - why do we override? What I have learnt so far is that by overring we can provide desired implementation to a method of a derived class, without changing the signature.

If I don&#39;t override the method of the superclass and I make changes to the method in the sub class, will that make changes to the super class method ?

I am also confused about the following - what does this demonstrate?

    class A
    {
        virtual m1()
        {
            console.writeline(&quot;Bye to all&quot;);
        }
    }

    class B : A
    {
        override m1()
        {
            console.writeLine(&quot;Hi to all&quot;);
        }
    }

    class C
    {
        A a = new A();
        B b = new B();
        a = b; (what is this)
        a.m1(); // what this will print and why?
    
        b = a; // what happens here?
    }

Overriding vs method hiding

I am trying to write a windows client application that calls a web site for data. To keep the install to a minimum I am trying only use [dlls in the .NET Framework Client Profile][1]. Trouble is that I need to UrlEncode some parameters, is there an easy way to do this without importing System.Web.dll which is not part of the Client Pofile?


  [1]: http://msdn.microsoft.com/en-us/library/ff462634.aspx

How do you UrlEncode without using System.Web?

In C/C++ you can define macros in code like this:

    #define OLD_WAY  1

Although I&#39;ve never done it, I assume that the same thing is available in C#.  More to the point, in C/C++ it is possible to then do some conditional compilation logic by doing something like this:

    #if OLD_WAY == 1
     int i = 0;
    #else
     int i = 1;
    #endif

OK, so this is all cool and all that.  And again, I assume that such logic is possible within C#.  What I&#39;d like to know is, how do I define constants at the project level, so that I can put in logic that will allow me to conditional compile one block of code if I define the constant one way, or another block of code if I don&#39;t define it that way?  I&#39;m assuming that it&#39;s done somewhere in the project&#39;s properties, but how and where do I define it?

How do I set a conditional compile variable?

This isn&#39;t a case-sensitive comparison in LINQ&amp;nbsp;to&amp;nbsp;Entities:

    Thingies.First(t =&gt; t.Name == &quot;ThingamaBob&quot;);

How can I achieve case sensitive comparison with LINQ&amp;nbsp;to&amp;nbsp;Entities?


LINQ to Entities case sensitive comparison

I&#39;d like to create a simple confirm dialog saying &quot;Please check the information and if you&#39;re sure it&#39;s correct, click OK.&quot;

Is there something built in like this?

Is there a builtin confirmation dialog in Windows Forms?

What is the difference between a click and mouseclick? 

I have a form **&quot;fm&quot;** that is a simple info window that opens every 10 mins (`fm.Show();`).

How I can make that every 10 mins it will check if the form **&quot;fm&quot;** is open and if it is open it closes it and open it again!

Now the form fm is always created with `form fm = new form();`  
so when I try to check if the form is open it will always be false and open a new window even if there is one form before!

I need to have a tool to give it a unique identity and then check if this form with unique identity is opened or not!

I do not want to just update the data on the form (fm), because I have a complicated info with buttons.

The form name is `&quot;UpdateWindow&quot;`

Thanks

How to check if a windows form is already open, and close it if it is?

I am using TabControl in #.NET application. By default first tab page of TabControl is showing in form loading. I want to activate/show other tab pages in form loading. Programmatically, how can I show other tab page?

Activate tabpage of TabControl

I have form which is opened using ShowDialog Method. In this form i have a Button called More.
If we click on More it should open another form and it should close the current form.

on More Button&#39;s Click event Handler i have written the following code

  

    MoreActions objUI = new MoreActions (); 
    objUI.ShowDialog();
    this.Close();

But what is happening is, it&#39;s not closing the first form. So, i modified this code to 

  

    MoreActions objUI = new MoreActions (); 
    objUI.Show();
    this.Close();

Here, The second form is getting displayed and within seconds both the forms getting closed.

Can anybody please help me to fix issue.  What i need to do is, If we click on More Button, it should open another form and close the first form.

Any kind of help will be really helpful to me.

Content Type	Original Author	Original Content on Stackoverflow
Question	Martijn	View Question on Stackoverflow
Solution 1 - C#	Jon Skeet	View Answer on Stackoverflow

C# Why use SuspendLayout()?

C# Problem Overview

C# Solutions

Solution 1 - C#

jQuery-UI datepicker default date

Curve text on existing circle

Attributions