Re: [Freeciv-Dev] Hex tileset

[Jules Bean <jmlb2@xxxxxxxxxxxxxxxx>]

Artur Biesiadowski wrote:
> 
> Jules Bean wrote:
> 
> >
> > The obvious drawing order is, for each hex, to draw the actual hex
> > first, and then draw all bits of adjacent hexes which overlap
> > (presumably transparent).  Finally, if implement, draw the 'on top'
> > layer (mountains, etc.)
> 
> Let's take squres for simplicty. On of them is
> 
>  xxx
>  xx
> 
> second
> yyy
>  yy
> 
> You have following layout
> 
> .....
> .xxyy.
> .xxyy.
> .....
> 
> Should you get
> 
> a)
> .....
> .xxxy.
> .xxyy.
> .....
> 
> or
> 
> b)
> .....
> .xyyy.
> .xxyy.
> .....
> 
> ?
> 
> It depends on painting order. With left to right order you get b always.
> With repaint myself then the neighbours you will get random one,
> dependent on which part of screen needs refresh (possibly even mixed
> pixels for toolkits that do strict clipping and unfortunate repaint
> requests will come)

You get

c)
.....
.xyxy
.xxyy
.....

At least, that's what I was trying to describe.

So the drawing order is this:


Draw cell x:

xx..
xx..

Draw overlaps from all neighbour into x (using alpha)

xy..
xx..

Draw cell y

xyyy
xxyy

Draw all overlaps from all neighbours into y using alpha

xyxy
xxyy

Jules




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