nanogui: Thread: displaying texts/fonts

Hi All,
I've ran into a few snags with texts and I'm trying to understand nanogui's implemsntation.

If for instance I have a text "nanogui is the best" and I want to display each phase ("nanogui" , "is" , etc.) with a different size and color it appears that I'll have to know more details of the font used to do this.
It appears that I'll have to know (calculate, maybe) the number of pixels and display each separately using GrText(). That implies fixed sized fonts.What about proportional fonts? 
Is this the way it is done? Do I understand this correctly? 
If I want to center this text in a window, is this approach used to do this as well?

Much Thanks,
Robbie,


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On 10 Feb 2006, at 21:37, Robbie wrote:
> It appears that I'll have to know (calculate, maybe) the number of  
> pixels and display each separately using GrText().

I think you are looking for this API call:

/**
  * GrGetGCTextSize:
  * @gc: the graphics context
  * @str: pointer to a text string
  * @count: the length of the string
  * @flags: text rendering flags (GR_TF*)
  * @retwidth: pointer to the variable the width will be returned in
  * @retheight: pointer to the variable the height will be returned in
  * @retbase: pointer to the variable the baseline height will be  
returned in
  *
  * Calculates the dimensions of the specified text string using the  
current font
  * and flags in the specified graphics context. The count argument  
can be -1
  * if the string is null terminated.
  */
void
GrGetGCTextSize(GR_GC_ID gc, void *str, int count, int flags,
         GR_SIZE *retwidth, GR_SIZE *retheight, GR_SIZE *retbase)

-- 
------------ Alex Holden - http://www.alexholden.net/ ------------
If it doesn't work, you're not hitting it with a big enough hammer

If that's the case, (I could use the below function to theoretically display a character by character), it is this an efficient use of this function to display character by character message keeping track of the cursor this way? Or effecient is not an issue here? 
Is there a mechanism for doing this any other way?

Thanks.


 --- On Sat 02/11, Alex Holden < ####@####.#### > wrote:
From: Alex Holden [mailto: ####@####.####
To: ####@####.####
     Cc: ####@####.####
Date: Sat, 11 Feb 2006 10:24:16 +0000
Subject: Re: [nanogui] displaying texts/fonts

OOn 10 Feb 2006, at 21:37, Robbie wrote:
> It appears that I'll have to know (calculate, maybe) the number of
> pixels and display each separately using GrText().

I think you are looking for this API call:

/**
* GrGetGCTextSize:
* @gc: the graphics context
* @str: pointer to a text string
* @count: the length of the string
* @flags: text rendering flags (GR_TF*)
* @retwidth: pointer to the variable the width will be returned in
* @retheight: pointer to the variable the height will be returned in
* @retbase: pointer to the variable the baseline height will be
returned in
*
* Calculates the dimensions of the specified text string using the
current font
* and flags in the specified graphics context. The count argument
can be -1
* if the string is null terminated.
*/
void
GrGetGCTextSize(GR_GC_ID gc, void *str, int count, int flags,
GR_SIZE *retwidth, GR_SIZE *retheight, GR_SIZE *retbase)

-- 

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: If that's the case, (I could use the below function to theoretically
display a character by character), it is this an efficient use of this
function to display character by character message keeping track of the
cursor this way? Or effecient is not an issue here?

Robbie -
    As Alex commented, GrGetGCTextSize is the way to calculate
the text string size character by character, or word by word.  Also
for centering.  The function takes account of whether the font
is proportional or fixed, and returns the correct result.

It's more efficient to draw more characters at a time.

Regards,

Greg