[postgis-devel] addPoint(line, point, [position])

[strk at refractions.net]

Maybe this is a more friendly approach:

	add(geometry, geometry, [pos])
	del(geometry, [pos])

These function would add or remove an element from a geometry.
Semantic would change based on input geometries.
Legal calls would then be:

	add(line, point, [pos]); 
	add(poly, line, [pos]); 
	add(multipoint, point, [pos]); 
	add(multiline, line, [pos]); 
	add(multipoly, poly, [pos]); 
	add(collection, any, [pos]);

	del(line, [pos]); // remove a point
	del(poly, [pos]); // remove a ring 
	del(multi, [pos]);

Does it sound better ?

--strk;

On Thu, Oct 28, 2004 at 10:57:19AM +0200, strk at refractions.net wrote:
> I've added a new construction mean for lines:
> 
> 	SELECT addPoint(line, point, [position]);
> 
> This way you can incrementally populate a line.
> Similarly we could define more incremental constructors,
> here is an initial proposal:
> 
>  F AddPoint(multipoint, point)
>  F AddPoint(collection, point)
> 
>  F DropPoint(line, int);
> 
>  F AddLine(multiline, line)
>  F AddLine(collection, line)
> 
>  F AddPoly(multipoly, poly)
>  F AddPoly(collection, poly)
> 
>  F AddHole(poly, line); // line must be a linearring
>  F DropHole(poly, int);
> 
>  F SetShell(poly, line); // line must be a linearring
> 
>  F DropElement(multipoint, int);
>  F DropElement(multiline, int);
>  F DropElement(multipoly, int);
>  F DropElement(collection, int);
> 
> What do you think ?
> 
> --strk;
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