Haversine (exp)
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(Différences entre les versions)
(Page créée avec « <source lang='delphi'>function haversine(geoloc:TGeolocation; lat,long:Double):Double;</source> Retourne la distance entre l'attribut Geolocation et un jeu de coordonnée... ») |
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| Ligne 4 : | Ligne 4 : | ||
Exemple : | Exemple : | ||
| + | |||
| + | '''Utilisation d'arguments''' | ||
<source lang="delphi"> | <source lang="delphi"> | ||
| + | //Procedure TestGeolocation; | ||
| + | var sel:TSelector; S:string; stag:string; inst:WFAddress; dd:double; lat,long:double; | ||
| + | begin | ||
| + | // looks for address in 100 meters range from a point. | ||
| + | // | ||
| + | lat := 38.897147; | ||
| + | long := -77.043934; | ||
| + | sel := WFAddress.CreateSelector('haversine(geoloc,%2,%3) < %1','',true,[0.1,lat,long]); | ||
| + | |||
| + | foreach inst in sel.AsCursor do | ||
| + | begin | ||
| + | dd := inst.Geoloc.haversine(38.897147,-77.043934); | ||
| + | showMessage(Format('%s %0.4f',[inst.Address1,dd])); | ||
| + | end; | ||
| + | end; | ||
| + | </source> | ||
| + | |||
| + | '''Utilisation de constantes''' | ||
| + | |||
| + | <source lang="delphi"> | ||
| + | //Procedure TestGeolocation; | ||
| + | var sel:TSelector; S:string; stag:string; inst:WFAddress; dd:double; | ||
| + | begin | ||
| + | // looks for address in 100 meters range from a point. | ||
| + | // | ||
| + | sel := WFAddress.CreateSelector('haversine(geoloc,38.897147,-77.043934) < %1','',true,[0.1]); | ||
| + | |||
| + | foreach inst in sel.AsCursor do | ||
| + | begin | ||
| + | dd := inst.Geoloc.haversine(38.897147,-77.043934); | ||
| + | showMessage(Format('%s %0.4f',[inst.Address1,dd])); | ||
| + | end; | ||
| + | end; | ||
</source> | </source> | ||
Version du 24 décembre 2013 à 12:45
function haversine(geoloc:TGeolocation; lat,long:Double):Double;
Retourne la distance entre l'attribut Geolocation et un jeu de coordonnées.
Exemple :
Utilisation d'arguments
//Procedure TestGeolocation; var sel:TSelector; S:string; stag:string; inst:WFAddress; dd:double; lat,long:double; begin // looks for address in 100 meters range from a point. // lat := 38.897147; long := -77.043934; sel := WFAddress.CreateSelector('haversine(geoloc,%2,%3) < %1','',true,[0.1,lat,long]); foreach inst in sel.AsCursor do begin dd := inst.Geoloc.haversine(38.897147,-77.043934); showMessage(Format('%s %0.4f',[inst.Address1,dd])); end; end;
Utilisation de constantes
//Procedure TestGeolocation; var sel:TSelector; S:string; stag:string; inst:WFAddress; dd:double; begin // looks for address in 100 meters range from a point. // sel := WFAddress.CreateSelector('haversine(geoloc,38.897147,-77.043934) < %1','',true,[0.1]); foreach inst in sel.AsCursor do begin dd := inst.Geoloc.haversine(38.897147,-77.043934); showMessage(Format('%s %0.4f',[inst.Address1,dd])); end; end;
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