Plateforme Level Extreme
Abonnement
Profil corporatif
Produits & Services
Support
Légal
English
Procedure for locating nearest site on X & Y Axis
Message
De
04/08/2001 00:42:19
Gerry Schmitz
GHS Automation Inc.
Calgary, Alberta, Canada
 
Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Divers
Thread ID:
00539725
Message ID:
00539745
Vues:
10
>I have a situation where I have X-Axis and Y-Axis coordinates for various sites in a geographical region. From one of those sites, I need to create a list of the other sites, beginning with the nearest one, and continuing out with the next nearest one, and so on, in that order.
>
>I am using a set of cursors, and manipulating them into a table that I actually display, but the final sort order is not quite there. If I manually measure some of the distances on the map as compared to the resulting list, they are still a little jumbled.
>
>Has anyone ever created a procedure that will do anything close to this? I am almost out of ideas, and need some help. ANY suggestions would be greatly appreciated.

Shift the origin (ie. 0, 0 ) to the main site of interest and adjust the coordinates of the various other sites by the adjustment amount; ie. if the main site was at 5, 5 ... change it to 0,0 and adjust the others by -5 and -5.

Now calculate the hypotenuse (ie. distance) to each point. Using an array or cursor you can now sort the points in ascending order/distance.

... where the hypotenuse = SQRT( x^2 + y^2 )
Précédent
Répondre
Fil
Voir

Click here to load this message in the networking platform