Re: antialiased line width

[James W. W. <os...@jw...>]

On Jul 20, 2006, at 5:05 AM, Roger Holmes wrote:

>
> On 20 Jul, 2006, at 01:23, James W. Walker wrote:
>
>> Can anyone explain why IRUpdate.c defines kAALineSize and
>> kAAPointSize as 0.5?  I'd think that 1.0 would be a more obvious
>> value.
>
>
> No I can't explain it but the value is used in only one place, and  
> a few
> lines further up it calls glDisable(GL_POLYGON_SMOOTH) which disables
> point antialiasing, and in that condition the value gets rounded to
> an integer.

A few lines later, there is glEnable(GL_POINT_SMOOTH), and depending  
on the style, there is glEnable(GL_LINE_SMOOTH).  Therefore, when the  
antialiasing happens, the width is not rounded to an integer.