[Swarm-Support] Re: Re: Walk to a spot on a 2d grid?

[Jurgen van der Pol]

Hi,

firmly in the trivia dep't: after pursuing the vector/angle route for a 
while, decided that it is too cumbersome. My final solution to 
purposefully step around a 2d grid is simply to set a normalised vector 
towards the destination x, y by taking the sign of the delta between 
destination and origin. Like

while (not at destination)
{
        xStep = sign(xDestination - xPosition);         // gives me either -1, 
0 or 1
        ystep = sign(yDestination - yPosition);         // gives me either -1, 
0 or 1
        xPosition = xPosition + xStep;                  // step
        yPosition = yPosition + yStep;                  // step
}

I fancied this up further by allowing for world wrap-around to ensure 
the shortest route. Crude, but it works (like Russian spacegear). 
Anybody brave enough to want to have a look at my botch job (plain 
vanilla ObjC, no Swarm in it (yet!)), just holler & start cringeing. 
Hey, I'm proud I even got this far!

Cheers,
Jurgen.