RE: [GD-General] GUI Design

[Tom F. <to...@mu...>]

We use a virtual resolution of 640x480, because it's easier for people to
grok than 0-1. Also, it's easy to make sure stuff is at least roughly
square. Then whether the actual rez is 640x448 or 800x600 or whatever, it's
all scaled accordingly.

It's zero cost for the GPU to rescale that to whatever coordinates it wants
- you just wrap it up in the projection matrix.


For GUIs with lots of text, it may be better to work in screen space, but
have each part of GUI "seek" towards a particular corner or edge (middle-top
of screen for example). So when giving coordinates in 640x480 space, you
always say which of the 9 (including the middle of the screen) positions its
relative to. Then the position ad size doesn't get scaled, it stays the same
size and moves along with its reference point.


Tom Forsyth - Muckyfoot bloke and Microsoft MVP.

This email is the product of your deranged imagination,
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> -----Original Message-----
> From: Jason Maynard [mailto:jma...@li...]
> Sent: 23 January 2003 00:46
> To: gam...@li...
> Subject: Re: [GD-General] GUI Design
> 
> 
> 
> Yeah I would recommend using values between 0.0 and 1.0 as a 
> percentage of
> the width or height of the screen like you said, you can 
> convert to actual
> screen coordinates by just multiplying the the screen width 
> or height then.
> 
> Another option is to design the GUI layout in a fixed 
> resolution and then to
> convert them into a different resolution apply a scaling 
> factor.  Say you
> have a point (x,y) in 640x480 layout and your screen is in 
> resolution WxH,
> then to find the point (x',y') in screen space:
> 
> x' = x * (W / 640);
> y' = y * (H / 480);
> 
> -Jason
> 
> ----- Original Message -----
> From: "Chris Brodie" <Chr...@ma...>
> To: <gam...@li...>
> Sent: Wednesday, January 22, 2003 4:14 PM
> Subject: [GD-General] GUI Design
> 
> 
> > I've been building a GUI for my game but from day 1 have 
> had a design
> issue I've been ignoring. From the beginning I've coded the coordinate
> system to OpenGL's bottom left origin. This is a minor pain 
> as I'm the only
> one who needs to worry about the coordinates in the menu xml 
> files (for
> now).
> >
> > The problem however is when I resize the screen everything remains
> squished in the bottom left corner of the screen. The only ay 
> I can think of
> solving the problem so it looks 'normal' is to provide some 
> kind of virtual
> scaling system that the menu is designed against that is then 
> translated in
> to screen coordinates. For example I could use something 
> simple like 100%
> equalling the width of the screen, so a box might be 20% wide 
> 15% high at
> position 5%,5%.
> >
> > How have you guys solved this problem? My solution 
> presented seems like
> it'll add a whole lot more math to the GUI to do all the 
> translations for
> the virtual screen space.
> >
> > Thoughts?
> >
> > Chris Brodie
> >
> >
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