Re: [boost] GUI coordinate units (Was: GUI foundations)

From: Martin Wille (mw8329_at_[hidden])
Date: 2005-10-04 15:11:53

Dave Harris wrote:

> Specifically, it sounds rather like the problem of drawing text nicely at 
> various resolutions. Consider TrueType, or Type 1 Postscript fonts. The 
> basic character shape is defined by vectors, by Bezier curves. To render 
> it prettily, so that, for example, all the vertical strokes on an 'm' are 
> the same thickness regardless of how the letter falls onto the pixel grid, 
> you need to add what Adobe call hints and Microsoft call grid-fitting.
> 
> Are you intending this system to be usable only on high-res desktop 
> machines? Or are you including hand-held devices, phones and wotnot, that 
> have relatively slow CPUs and where 640x320 is ambitiously high 
> resolution?
> 
> There is some discussion about TrueType grid-fitting about half-way down 
> this page: 
>   http://www.microsoft.com/typography/otspec/TTCH01.htm

Did you look at the examples on the antigrain.com website? They show 
that with good anti-aliasing and with subpixel accuracy you get very 
good results even when the display resolution is lower than the 
resolutions of the details of the displayed objects. The spirals at 
http://tinyurl.com/836fe look pretty impressive, IMHO.

Regards,
m
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