Le portail francophone de la géomatique

Loic_GR · Wed 01 February 2012 10:36

Bonjour,

je cherche la méthode pour créer une ligne à partir de multiples points wgs84.

J'ai essayé sans succès :

Code:

var gpx = new OpenLayers.Layer.LinearRing(<?php echo $coordonnees; ?>), {
            format: OpenLayers.Format,
                style: {strokeColor: "red", strokeWidth: 5, strokeOpacity: 0.5},
                projection: new OpenLayers.Projection("EPSG:4326")
            });
            map.addLayer(gpx);

ou $coordonnees est une variable remontant les coordonnées sous forme lon,lat lon,lat...

Pouvez-vous me guider ?

merci.

Dernière modification par heretik25 (Wed 01 February 2012 10:37)

Yves · Sun 05 February 2012 16:09

Bonjour,

L'API indique que le constructeur nécessite un tableau de OpenLayers.Geometry.Point.

Donc il faut le faire en plusieurs étape, présenté ici en pure JavaScript :

Code:

/** on part de deux variables existantes lat et lon, de type array et de même longueur.
** Ceux-ci peuvent venir d'une requête AJAX qui renvoie un json simple.
**/
var point new Array;
for(i=0; i < lat.lentgh; i++) {
  point[] = OpenLayers.Geometry.Point(lat[i],lon[i]);
}

var gpx = new OpenLayers.Layer.LinearRing(point, {
            format: OpenLayers.Format,
                style: {strokeColor: "red", strokeWidth: 5, strokeOpacity: 0.5},
                projection: new OpenLayers.Projection("EPSG:4326")
 });

http://dev.openlayers.org/releases/OpenLayers-2.7/doc/apidocs/files/OpenLayers/Geometry/LinearRing-js.html#OpenLayers.Geometry.LinearRing.OpenLayers.Geometry.LinearRing

Y.

Loic_GR · Mon 06 February 2012 10:50

Bonjour et merci pour la proposition,

J'ai utilisé votre code et dynamiquement en php, j'ajoute les coordonnées

Voici le code source généré :

Code:

var gpx = new OpenLayers.Layer.LinearRing(6.07952,47.2839 6.07952,47.2839 6.07952,47.2839 6.07952,47.2839 6.07952,47.2839 6.07952,47.2839 6.07952,47.2839 6.08125,47.2853 6.08133,47.2854 6.08162,47.2857 6.08203,47.2859 6.08235,47.2861 6.08263,47.2864 6.08282,47.2867 6.08297,47.287 6.08308,47.2872 6.08345,47.2874 6.08355,47.2876 6.08376,47.2878 6.08378,47.288 6.08368,47.2884 6.08364,47.2886 6.08396,47.2887 6.08399,47.2886 6.08411,47.2882 6.08414,47.2879 6.08417,47.2877 6.08413,47.2876 6.08417,47.2875 6.0842,47.2875 6.08428,47.2875 6.08438,47.2875 6.08441,47.2879 6.08444,47.2881 6.08443,47.2883 6.0844,47.2884 6.08439,47.2885 6.08432,47.2886 6.08427,47.2889 6.08429,47.2889 6.08428,47.2893 6.08426,47.2893 6.08421,47.2894 6.08402,47.2894 6.08398,47.2895 6.08384,47.2895 6.08375,47.2896 6.08372,47.2896 6.08371,47.2897 6.08373,47.2899 6.08374,47.29 6.0838,47.2902 6.08388,47.2903 6.08398,47.2903 6.08401,47.2904 6.08405,47.2904 6.08405,47.2905 6.08397,47.2906 6.08384,47.2906 6.08365,47.2906 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6.07153,47.304 6.07153,47.304 6.07158,47.3038 6.07158,47.3036 6.07128,47.3035 6.07108,47.3034 6.07072,47.3033 6.07002,47.3029 6.06946,47.3027 6.06926,47.3026 6.0692,47.3026 6.06904,47.3025 6.06836,47.3023 6.06754,47.3019 6.06732,47.3019 6.06685,47.3017 6.0668,47.3016 6.06639,47.3015 6.06636,47.3015 6.06628,47.3015 6.06629,47.3015 6.0666,47.3012 6.06682,47.301 6.06692,47.3009 6.0671,47.3007 6.06738,47.3003 6.06758,47.3001 6.06758,47.3001 6.06764,47.3 6.06765,47.3 6.06768,47.3 6.06785,47.2998 6.06798,47.2997 6.06803,47.2997 6.06804,47.2996 6.06807,47.2996 6.06814,47.2995 6.06807,47.2995 6.06803,47.2994 6.06806,47.2994 6.06808,47.2995 6.06795,47.2994 6.06767,47.2992 6.06734,47.2989 6.0673,47.2988 6.06695,47.2985 6.06636,47.2981 6.06616,47.298 6.06567,47.2976 6.06564,47.2975 6.06548,47.2974 6.0651,47.2971 6.06503,47.2971 6.06496,47.297 6.06489,47.297 6.06483,47.297 6.06481,47.297 6.0648,47.297 6.06478,47.2969 6.06476,47.2969 6.06478,47.2969 6.06481,47.2969 6.06479,47.297 6.06476,47.297 6.0648,47.297 6.06453,47.2972 6.06397,47.2976 6.06391,47.2976 6.06357,47.2979 6.06341,47.298 6.06336,47.2981 6.06332,47.2981 6.0631,47.2983 6.06295,47.2984 6.06285,47.2984 6.06281,47.2985 6.06277,47.2985 6.06276,47.2985 6.06256,47.2985 6.06241,47.2986 6.06231,47.2986 6.06206,47.299 6.06202,47.2991 6.06193,47.2992 6.06171,47.2994 6.06169,47.2994 6.06161,47.2994 6.06147,47.2996 6.06122,47.2998 6.06115,47.2998 6.06106,47.3 6.06085,47.3002 6.06083,47.3002 6.06053,47.3004 6.06041,47.3004 6.06007,47.3001 6.05968,47.2998 6.05905,47.2993 6.05901,47.2993 6.05896,47.2992 6.05879,47.2991 6.05866,47.299 6.05849,47.2989 6.0578,47.2983 6.05764,47.2982 6.05756,47.2981 6.05686,47.2975 6.05663,47.2973 6.05627,47.297 6.05589,47.2968 6.05563,47.2966 6.05537,47.2963 6.05529,47.2963 6.05508,47.2961 6.05501,47.296 6.05476,47.2959 6.05473,47.2958 6.05452,47.2957 6.05437,47.2956 6.05408,47.2954 6.05395,47.2953 6.05388,47.2953 6.05363,47.2951 6.0536,47.2951 6.05359,47.295 6.05361,47.295 6.05365,47.2949 6.05369,47.2949 6.05375,47.2948 6.0538,47.2948 6.05386,47.2948 6.05387,47.2947 6.05387,47.2947 6.05386,47.2947 6.05386,47.2947 6.05407,47.2948 6.0541,47.2948 6.05413,47.2948 6.05415,47.2947 6.05415,47.2947 6.05415,47.2947 6.05415,47.2947 6.05414,47.2946 6.05413,47.2946 6.05406,47.2945 6.05405,47.2945 6.05401,47.2945 6.054,47.2945 6.05397,47.2945 6.0539,47.2945 6.05386,47.2945 6.05384,47.2945 6.05382,47.2945 6.05356,47.2945 6.05351,47.2945 6.05323,47.2944 6.05319,47.2944 6.053,47.2943 6.053,47.2943 6.05297,47.2943 6.05281,47.2942 6.0526,47.294 6.05251,47.2939 6.05273,47.2938 6.05312,47.2935 6.05365,47.2931 6.05396,47.2929 6.05418,47.2928 6.05439,47.2925 6.05461,47.2924 6.05478,47.2923 6.05498,47.2921 6.05522,47.2919 6.05537,47.2918 6.05553,47.2916 6.05582,47.2914 6.05607,47.2912 6.05614,47.2911 6.05674,47.2907 6.05682,47.2907 6.05733,47.2903 6.05749,47.2902 6.05781,47.2899 6.05788,47.2899 6.05789,47.2897 6.05772,47.2895 6.0577,47.2894 6.05764,47.2893 6.05747,47.289 6.05711,47.2886 6.05709,47.2885 6.05711,47.2884 6.05713,47.2884 6.05715,47.2883 6.0572,47.2882 6.05725,47.2881 6.0573,47.2881 6.05737,47.2881 6.05745,47.2881 6.05752,47.288 6.05798,47.2879 6.05802,47.2879 6.05803,47.2879 6.05815,47.2879 6.05836,47.2875 6.05841,47.2873 6.05846,47.2872 6.05848,47.2871 6.05852,47.2871 6.05855,47.287 6.05857,47.287 6.05859,47.287 6.05864,47.287 6.05902,47.2868 6.05937,47.2863 6.05955,47.2862 6.05959,47.2862 6.05962,47.2862 6.05966,47.2861 6.05969,47.2861 6.05992,47.286 6.05997,47.2859 6.05999,47.2859 6.06001,47.2859 6.06003,47.2859 6.06005,47.2859 6.06015,47.2858 6.06015,47.2858 6.05981,47.2854 6.05974,47.2854 6.05936,47.285 6.05915,47.2848 6.05912,47.2847 6.05908,47.2847 6.05905,47.2847 6.05899,47.2846 6.05869,47.2844 6.05856,47.2842 6.05845,47.2842 6.05838,47.2841 6.05835,47.2838 6.05797,47.2836 6.05758,47.2834 6.05748,47.2833 6.05725,47.2833 6.05718,47.2833 6.05718,47.2833 6.05721,47.2833 6.05706,47.2831 6.05708,47.2831 6.05715,47.283 6.0572,47.283 6.05726,47.283 6.05729,47.2829 6.05746,47.2828 6.0577,47.2826 6.05828,47.2823 6.05851,47.282 6.0587,47.2819 6.05866,47.2813 6.05854,47.2806 6.0585,47.2805 6.05846,47.2804 6.05841,47.2804 6.05836,47.2803 6.0583,47.2803 6.05802,47.2801 6.05774,47.2798 6.05771,47.2798 6.05753,47.2795 6.05745,47.2793 6.05743,47.2792 6.0574,47.279 6.05747,47.2786 6.05751,47.2785 6.05756,47.2785 6.05762,47.2784 6.05769,47.2784 6.05778,47.2784 6.05787,47.2784 6.05795,47.2783 6.05804,47.2783 6.05812,47.2784 6.05821,47.2784 6.05827,47.2784 6.05833,47.2784 6.05838,47.2785 6.05868,47.2787 6.05915,47.2791 6.05979,47.2795 6.05982,47.2795 6.05986,47.2795 6.06009,47.2795 6.06027,47.2795 6.0603,47.2795 6.06032,47.2796 6.06056,47.28 6.06062,47.28 6.0607,47.2801 6.06085,47.2802 6.06122,47.2805 6.06185,47.281 6.06296,47.2818 6.06407,47.2826 6.06475,47.2832 6.06481,47.2832 6.06539,47.2837 6.06569,47.284 6.06628,47.2847 6.06658,47.285 6.06671,47.2852 6.06672,47.2852 6.06692,47.2854 6.06719,47.2857 6.06746,47.2859 6.06749,47.2859 6.0675,47.2859 6.0675,47.286 6.0675,47.286 6.06789,47.2864 6.06821,47.2868 6.06856,47.2872 6.06881,47.2875 6.06908,47.2879 6.06939,47.2884 6.06977,47.289 6.07034,47.2899 6.07077,47.2905 6.07076,47.2905 6.07078,47.2905 6.0708,47.2906 6.07135,47.2912 6.07177,47.2917 6.07178,47.2917 6.07218,47.2921 6.0726,47.2926 6.07367,47.293 6.0742,47.2932 6.07424,47.2932 6.07428,47.2932 6.07432,47.2932 6.07437,47.2932 6.07509,47.2932 6.07513,47.2932 6.07527,47.2932 6.07511,47.2932 6.07499,47.2932 6.07482,47.2932 6.07432,47.2932 6.07427,47.2933 6.07427,47.2933 6.0743,47.2933 6.07525,47.294 6.07531,47.294 6.07669,47.2946 6.07769,47.295 6.07837,47.2955 6.07865,47.2957 6.07865,47.2957 6.07865,47.2957 6.07866,47.2957 6.07907,47.296 6.07985,47.2966 6.07995,47.2966 6.08005,47.2967 6.08034,47.2968 6.08051,47.2969 6.08058,47.2969 6.08064,47.2969 6.08069,47.2969 6.08073,47.2969 6.08119,47.2969 6.08141,47.2969 6.08143,47.2969 6.08144,47.2969 6.08146,47.2969 6.08147,47.2968 6.08148,47.2968 6.08174,47.2966 6.08199,47.2964 6.0822,47.296 6.08227,47.2959 6.08228,47.2959 6.08229,47.2958 6.08231,47.2957 6.08247,47.2954 6.08248,47.2954 6.08291,47.2952 6.08297,47.2951 6.08308,47.2951 6.08326,47.2948 6.08334,47.2945 6.08345,47.2941 6.08351,47.2939 6.08382,47.2935 6.08398,47.293 6.08386,47.2926 6.08383,47.2918 6.08427,47.2913 6.08437,47.2911 6.08439,47.291 6.08438,47.291 6.08428,47.2906 6.0842,47.2905 6.08419,47.2905 6.08413,47.2904 6.08408,47.2903 6.08401,47.2903 6.08384,47.2902 6.0838,47.2901 6.08377,47.2901 6.0837,47.29 6.08367,47.2899 6.08362,47.2898 6.08359,47.2897 6.08358,47.2897 6.08353,47.2896 6.08351,47.2895 6.08351,47.2895 6.08351,47.2895 6.08353,47.2893 6.08357,47.2893 6.08357,47.2891 6.0836,47.289 6.08355,47.2887 6.08351,47.2886 6.08351,47.2886 6.08351,47.2885 6.08353,47.2885 6.08355,47.2884 6.08359,47.2881 6.08358,47.2879 6.08354,47.2878 6.0835,47.2877 6.08317,47.2872 6.08294,47.2868 6.08264,47.2864 6.0825,47.2861 6.08225,47.2858 6.08196,47.2856 6.0818,47.2855 6.08176,47.2854 6.08134,47.2852 6.08128,47.2852 6.0811,47.285 6.08107,47.2849 6.08105,47.2849 6.08104,47.2846 6.08101,47.2846 6.08097,47.2845 6.08086,47.2843 6.08045,47.2839 6.08035,47.2839 6.08001,47.2837 6.07996,47.2837 6.07991,47.2837 6.07988,47.2837 6.07984,47.2837 6.07981,47.2837 6.07978,47.2837 6.07977,47.2838 6.07975,47.2838 6.0795,47.2839 6.07948,47.2839 6.07947,47.2839 6.07949,47.2838 6.07951,47.2838 6.07953,47.2838 6.07952,47.2838 6.07947,47.2838 6.0796,47.2837 6.07977,47.2838 6.07998,47.2841 6.08005,47.2841 6.08019,47.2841 ), {
            format: OpenLayers.Format,
                style: {strokeColor: "red", strokeWidth: 5, strokeOpacity: 0.5},
                projection: new OpenLayers.Projection("EPSG:4326")
            });
            map.addLayer(gpx);

Cependant, j'ai une erreur : init is not define

init étant ma fonction gérant tous le bloc Openlayers.

Avez-vous une idée sur le pourquoi de cette erreur ?

Merci.

Dernière modification par heretik25 (Mon 06 February 2012 11:51)

Yves · Mon 06 February 2012 11:41

Bonjour,

Suis pas sur que tu es vraiment utilisé mon code

Il y a un caractère "]" à la fin de ton code qui doit poser problème.

Y.

Loic_GR · Mon 06 February 2012 11:49

Yves a écrit:

Bonjour,

Suis pas sur que tu es vraiment utilisé mon code

Il y a un caractère "]" à la fin de ton code qui doit poser problème.

Y.

Bonjour et merci pour la réponse,

le "]" est un erreur de la balise ["code"] du forum, mon code n'a pas ce crochet.

Je n'utilise pas le code qui génère l'array en javascript car je le génère en PHP suite à une requête dynamique.

Dernière modification par heretik25 (Mon 06 February 2012 11:51)

Yves · Mon 06 February 2012 11:57

Es tu sur que "OpenLayers.Geometry.Point(lat[i],lon[i]);" ne renvoie que '6.07952 47.2839'

D'ailleurs je pense que ton code est incorrecte : 6.07952,47.2839 6.07952,47.2839 => 6.07952 47.2839, 6.07952 47.2839

Y.

Ludo · Mon 06 February 2012 12:01

Si tu passes par du php, pourquoi ne pas générer un webservice renvoyant un geojson de type "ligne", directement utilisable par openlayers ?
Un tuto qui décrie ce genre de chose http://www.portailsig.org/content/carte … et-postgis

Dernière modification par Ludo (Mon 06 February 2012 12:01)

Loic_GR · Mon 06 February 2012 12:09

Enfaite, je prépare les données côté php. Faut-il que pour chaque couple x/y j’utilise OpenLayers.Geometry.Point(lat[i],lon[i]); ?

Pourrais-je le préparer côté php ?

Code:

while ($tab_select_coordonne = $sql_select_coordonne->fetch())
    {
        $coordonnees .= $tab_select_coordonne['coord_gps_lon'].' '.$tab_select_coordonne['coord_gps_lat'].', ';
    }

Yves · Mon 06 February 2012 13:51

Bonjour,

Je ne pense pas, plutôt :

Code:

while ($tab_select_coordonne = $sql_select_coordonne->fetch())
    {
        $coordonnees[]= 'new OpenLayers.Geometry.Point('.$tab_select_coordonne['coord_gps_lon'].', '.$tab_select_coordonne['coord_gps_lat'].')';
    }

Puis :

Code:

explode(',',$coordonnees);

Pour renvoyer le contenu sans avoir à traiter de "," à la fin de la chaîne de caractères.

Y.

Loic_GR · Mon 06 February 2012 14:12

Merci pour la proposition cependant l'explode n'explose rien puisqu'il ne trouve pas de virgule. Vous vouliez faire un explode comment ?

Yves · Mon 06 February 2012 14:18

C'est une erreur de ma part que je fais souvent : il fallait lire implode

Y.

Loic_GR · Mon 06 February 2012 14:24

On se retrouve en code source avec :

Code:

            
            var gpx = new OpenLayers.Layer.LinearRing(OpenLayers.Geometry.Point(lat[i],lon[i]);new OpenLayers.Geometry.Point(6.07952, 47.2839),new OpenLayers.Geometry.Point(6.07952, 47.2839),new OpenLayers.Geometry.Point(6.07952, 47.2839),new OpenLayers.Geometry.Point(6.07952, 47.2839),new OpenLayers.Geometry.Point(6.07952, 47.2839),new OpenLayers.Geometry.Point(6.07952, 47.2839),new OpenLayers.Geometry.Point(6.07952, 47.2839),new OpenLayers.Geometry.Point(6.08125, 47.2853),new OpenLayers.Geometry.Point(6.08133, 47.2854),new OpenLayers.Geometry.Point(6.08162, 47.2857),new OpenLayers.Geometry.Point(6.08203, 47.2859),new OpenLayers.Geometry.Point(6.08235, 47.2861),new OpenLayers.Geometry.Point(6.08263, 47.2864),new OpenLayers.Geometry.Point(6.08282, 47.2867),new OpenLayers.Geometry.Point(6.08297, 47.287),new OpenLayers.Geometry.Point(6.08308, 47.2872),new OpenLayers.Geometry.Point(6.08345, 47.2874),new OpenLayers.Geometry.Point(6.08355, 47.2876),new OpenLayers.Geometry.Point(6.08376, 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OpenLayers.Geometry.Point(6.07996, 47.2837),new OpenLayers.Geometry.Point(6.07991, 47.2837),new OpenLayers.Geometry.Point(6.07988, 47.2837),new OpenLayers.Geometry.Point(6.07984, 47.2837),new OpenLayers.Geometry.Point(6.07981, 47.2837),new OpenLayers.Geometry.Point(6.07978, 47.2837),new OpenLayers.Geometry.Point(6.07977, 47.2838),new OpenLayers.Geometry.Point(6.07975, 47.2838),new OpenLayers.Geometry.Point(6.0795, 47.2839),new OpenLayers.Geometry.Point(6.07948, 47.2839),new OpenLayers.Geometry.Point(6.07947, 47.2839),new OpenLayers.Geometry.Point(6.07949, 47.2838),new OpenLayers.Geometry.Point(6.07951, 47.2838),new OpenLayers.Geometry.Point(6.07953, 47.2838),new OpenLayers.Geometry.Point(6.07952, 47.2838),new OpenLayers.Geometry.Point(6.07947, 47.2838),new OpenLayers.Geometry.Point(6.0796, 47.2837),new OpenLayers.Geometry.Point(6.07977, 47.2838),new OpenLayers.Geometry.Point(6.07998, 47.2841),new OpenLayers.Geometry.Point(6.08005, 47.2841),new OpenLayers.Geometry.Point(6.08019, 47.2841)), {
            format: OpenLayers.Format,
            style: {strokeColor: "red", strokeWidth: 5, strokeOpacity: 0.5},
            projection: new OpenLayers.Projection("EPSG:4326")
            });
            map.addLayer(gpx);

Mais l'erreur persiste, init is not define

Yves · Mon 06 February 2012 15:11

var gpx = new OpenLayers.Layer.LinearRing([new OpenLayers.Geometry.P[...] ], {
format: OpenLayers.Format,
style: {strokeColor: "red", strokeWidth: 5, strokeOpacity: 0.5},
projection: new OpenLayers.Projection("EPSG:4326")
});
map.addLayer(gpx);

autrement dit : supprimer la ")" à la fin de la liste des géométries et la remplacer par un "]" et rajouter un "[" au début

Y.
PS : j'ai modifié mon code originel

Loic_GR · Mon 06 February 2012 15:48

Comme ceci : ?

Code:

var gpx = new OpenLayers.Layer.LinearRing([new OpenLayers.Geometry.Point[<?php echo implode(',',$coordonnees); ?>] ], {
           format: OpenLayers.Format,
            style: {strokeColor: "red", strokeWidth: 5, strokeOpacity: 0.5},
            projection: new OpenLayers.Projection("EPSG:4326")
            });
            map.addLayer(gpx);

Yves · Mon 06 February 2012 16:28

non plutôt :

Code:

var gpx = new OpenLayers.Layer.LinearRing([<?php echo implode(',',$coordonnees); ?>] , {
           format: OpenLayers.Format,
            style: {strokeColor: "red", strokeWidth: 5, strokeOpacity: 0.5},
            projection: new OpenLayers.Projection("EPSG:4326")
            });
            map.addLayer(gpx);

Avec echo implode(',',$coordonnees); qui renvoie New OpenLayers.Geometry.Point(lat[i],lon[i]);new OpenLayers.Geometry.Point(6.07952, 47.2839), ...

Y.

Loic_GR · Mon 06 February 2012 16:45

Ok merci pour votre patience,

Me voilà par-contre avec l'erreur

Code:

Erreur : OpenLayers.Layer.LinearRing is not a constructor

Dernière modification par heretik25 (Mon 06 February 2012 16:45)

Yves · Mon 06 February 2012 17:15

Bonjour,

J'ai pas trop fait attention mais OpenLayers.Layer.LinearRing n'existe pas en effet, par contre :

http://dev.openlayers.org/releases/Open … ng-js.html

si tu remplaces par la bonne méthode il faudra que tu te crées une couche vector et que tu y rajoutes ces géométries via la méthode addFeatures :

http://dev.openlayers.org/releases/Open … ddFeatures

qui prend comme argument un vectorFeature :

http://dev.openlayers.org/releases/Open … ure.Vector

qui prend bien une géométrie en argument.

Y.
PS : renvoyer un geojson en mode ajax est certainement plus facile

Loic_GR · Tue 07 February 2012 08:45

Bonjour,

Si cela est plus simple en ajax, pouvez-vous m'expliquer la démarche ?

Merci !

Ludo · Wed 08 February 2012 09:23

Tu peux regarder le lien que j'ai donné plus haut
Sinon perso j'utilise ce genre de chose côté openlayers :
Bien sur ça ne marche que si le service web associé renvoie correctement un geojson (pour cela voir le lien que j'ai mis plus haut et le code associé au service web en php)
J'espère ne rien avoir oublié, j'ai fais un copier coller rapide.

Code:

var request = OpenLayers.Request.POST({
    url: url_test, //variable représentant l'url du webservice qui renvoie un geojson
    data:xml_test, //variable contenant les paramètres, si on envoie des paramètres sous la forme d'un fichier xml
    headers: {
    "Content-Type": "text/xml"
    },
    callback: handler
})

function handler(request) {
    if(!request.responseXML) {
        //le style pour la couche
        var styleLayer = new OpenLayers.StyleMap(OpenLayers.Util.applyDefaults(
            {pointRadius:4, fillColor: couleurCouche, fillOpacity: 0.7, strokeColor: "black"},
            OpenLayers.Feature.Vector.style["default"]));
        //On récupère le geojson
        var featurecollection = request.responseText;
        var geojson_format = new OpenLayers.Format.GeoJSON();
        //On crée une nouvelle couche
        var vector_layer = new OpenLayers.Layer.Vector("test",{displayInLayerSwitcher:false,styleMap: styleLayer}); 
        map.addLayer(vector_layer);
        //On ajoute les entités à la couche
        vector_layer.addFeatures(geojson_format.read(featurecollection));
    }
}

Dernière modification par Ludo (Wed 08 February 2012 09:26)

Loic_GR · Wed 08 February 2012 15:51

Créer un service web pour diffuser mes données ? Est-ce envisageable à partir d'un hébergement mutualisé ?

Ludo · Wed 08 February 2012 15:59

Tu as bien un page php qui te renvoie des données ? ton "service web" c'est ça, as tu regardé le script php dans le lien que je t'ai mis plus haut ?

Loic_GR · Thu 09 February 2012 08:54

Ludo a écrit:

Tu as bien un page php qui te renvoie des données ? ton "service web" c'est ça, as tu regardé le script php dans le lien que je t'ai mis plus haut ?

J'ai regardé le code proposé. l'objectif est donc de faire un geojson en php. Je vais essayer de construire quelque chose à partir de l'exemple et reviendrai sûrement pour demander de l'aide.

Merci.

Loic_GR · Thu 09 February 2012 09:22

Bonjour,

Est-ce que la préparation du geojson vous paraît bonne ?

Code:

//Génération de la chaîne GeoJSON
    $str = '';
    $str .= '{
    "type": "FeatureCollection",
    "features": [';
    while ($tab_select_coordonne = $sql_select_coordonne->fetch()) 
    {
        $str .= '{
            "geometry": {
                "type": "LineString",
                "coordinates": ['.$tab_select_coordonne['coord_gps_lon'].','.$tab_select_coordonne['coord_gps_lat'].']
            },
        },';
    }
    $str .= ']}';
    echo $str;

Ludo · Thu 09 February 2012 10:05

Qu'écrit la page ? (donne le résultat écrit par la page php)
Tu verras bien plus facilement si tu as le bon résultat, tu peux même en faire une copie, l'enregistrer et l'ouvrir dans qgis (ou même directement mettre l'url dans qgis)
Ceci dit je suis pas sur que ton code écrive les coordonnées correctement là mais à vérifier

Dernière modification par Ludo (Thu 09 February 2012 10:06)

Loic_GR · Thu 09 February 2012 10:27

Voici l'echo du résultat sur 100 points

Code:

{ "type": "FeatureCollection", "features": [{ "geometry": { "type": "LineString", "coordinates": [6.07952,47.2839] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07952,47.2839] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07952,47.2839] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07952,47.2839] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07952,47.2839] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07952,47.2839] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07952,47.2839] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08125,47.2853] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08133,47.2854] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08162,47.2857] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08203,47.2859] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08235,47.2861] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08263,47.2864] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08282,47.2867] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08297,47.287] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08308,47.2872] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08345,47.2874] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08355,47.2876] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08376,47.2878] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08378,47.288] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08368,47.2884] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08364,47.2886] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08396,47.2887] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08399,47.2886] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08411,47.2882] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08414,47.2879] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08417,47.2877] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08413,47.2876] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08417,47.2875] }, },{ "geometry": { "type": "LineString", "coordinates": [6.0842,47.2875] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08428,47.2875] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08438,47.2875] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08441,47.2879] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08444,47.2881] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08443,47.2883] }, },{ "geometry": { "type": "LineString", "coordinates": [6.0844,47.2884] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08439,47.2885] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08432,47.2886] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08427,47.2889] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08429,47.2889] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08428,47.2893] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08426,47.2893] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08421,47.2894] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08402,47.2894] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08398,47.2895] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08384,47.2895] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08375,47.2896] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08372,47.2896] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08371,47.2897] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08373,47.2899] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08374,47.29] }, },{ "geometry": { "type": "LineString", "coordinates": [6.0838,47.2902] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08388,47.2903] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08398,47.2903] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08401,47.2904] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08405,47.2904] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08405,47.2905] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08397,47.2906] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08384,47.2906] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08365,47.2906] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08353,47.2906] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08347,47.2906] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08339,47.2906] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08324,47.2905] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08318,47.2905] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08312,47.2904] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08304,47.2903] }, },{ "geometry": { "type": "LineString", "coordinates": [6.083,47.2903] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08252,47.29] }, },{ "geometry": { "type": "LineString", "coordinates": [6.0817,47.2896] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08112,47.2894] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08087,47.2893] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08053,47.2892] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08049,47.2892] }, },{ "geometry": { "type": "LineString", "coordinates": [6.08045,47.2892] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07992,47.2888] }, },{ "geometry": { "type": "LineString", "coordinates": [6.0799,47.2888] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07971,47.2889] }, },{ "geometry": { "type": "LineString", "coordinates": [6.0796,47.2889] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07944,47.289] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07941,47.2891] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07914,47.2893] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07908,47.2893] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07873,47.2896] }, },{ "geometry": { "type": "LineString", "coordinates": [6.0787,47.2896] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07864,47.2896] }, },{ "geometry": { "type": "LineString", "coordinates": [6.0786,47.2896] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07847,47.2897] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07831,47.2897] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07825,47.2898] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07797,47.2899] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07788,47.2899] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07781,47.2899] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07774,47.29] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07769,47.29] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07763,47.29] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07718,47.2903] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07693,47.2904] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07641,47.2902] }, },{ "geometry": { "type": "LineString", "coordinates": [6.07557,47.2899] }, },]}

Vous semble t-il juste ?

Qgis, n'arrive pas à me l'ouvrir.

Ludo · Thu 09 February 2012 11:07

Non
Regarde les spécifications du geojson

Code:

{ "type": "LineString",
  "coordinates": [ [100.0, 0.0], [101.0, 1.0] ]
  }

Issue de http://geojson.org/geojson-spec.html#id3

Loic_GR · Thu 09 February 2012 11:54

Il manque les crochets, c'est ça ?

Loic_GR · Tue 21 February 2012 09:42

up svp :-)

Loic_GR · Tue 13 March 2012 16:25

Bonjour,

En essayant ceci

Code:

    //Génération de la chaîne GeoJSON
    $str = '';
    $str .= '{
    "type": "Feature",
      "geometry": {
        "type": "LineString",
        "coordinates": [';
              
    while ($tab_select_coordonne = $sql_select_coordonne->fetch()) 
    {
        if($total_retour == 1)
        {
            $virgule = '';
        }
        else
        {
            $virgule = ',';
        }
        
        $str .='['.$tab_select_coordonne['coord_gps_lon'].','.$tab_select_coordonne['coord_gps_lat'].']'.$virgule;
        $total_retour--;
    }
    $str .= ']}}';
    
    echo $str;

J'ai apparemment un code plus logique mais si je donne l'url à QGIS, j'ai une erreur.

Par avance, merci pour votre aide.

Cornet Jérémie · Wed 14 March 2012 08:33

Bonjour,
Personnellement, pour générer du json (ou du geojson), j'utilise un tableau associatif emboité qui a la même structure que le json.
Quand le tableau est prêt, la fonction json_encode($mon_tableau) finit le travail.

PS : peux tu donner un exemple de fichier geojson généré par ton code ?

Dernière modification par Cornet Jérémie (Wed 14 March 2012 09:09)

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#1 Wed 01 February 2012 10:36

[Openlayers] Créer une polyligne à partir de données X/Y

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Re: [Openlayers] Créer une polyligne à partir de données X/Y

Code:

#3 Mon 06 February 2012 10:50

Re: [Openlayers] Créer une polyligne à partir de données X/Y

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#4 Mon 06 February 2012 11:41

Re: [Openlayers] Créer une polyligne à partir de données X/Y

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#6 Mon 06 February 2012 11:57

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#7 Mon 06 February 2012 12:01

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#8 Mon 06 February 2012 12:09

Re: [Openlayers] Créer une polyligne à partir de données X/Y

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#9 Mon 06 February 2012 13:51

Re: [Openlayers] Créer une polyligne à partir de données X/Y

Code:

Code:

#10 Mon 06 February 2012 14:12

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#11 Mon 06 February 2012 14:18

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#12 Mon 06 February 2012 14:24

Re: [Openlayers] Créer une polyligne à partir de données X/Y

Code:

#13 Mon 06 February 2012 15:11

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#14 Mon 06 February 2012 15:48

Re: [Openlayers] Créer une polyligne à partir de données X/Y

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#15 Mon 06 February 2012 16:28

Re: [Openlayers] Créer une polyligne à partir de données X/Y

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#16 Mon 06 February 2012 16:45

Re: [Openlayers] Créer une polyligne à partir de données X/Y

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#17 Mon 06 February 2012 17:15

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#18 Tue 07 February 2012 08:45

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#19 Wed 08 February 2012 09:23

Re: [Openlayers] Créer une polyligne à partir de données X/Y

Code:

#20 Wed 08 February 2012 15:51

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#21 Wed 08 February 2012 15:59

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#22 Thu 09 February 2012 08:54

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#23 Thu 09 February 2012 09:22

Re: [Openlayers] Créer une polyligne à partir de données X/Y

Code:

#24 Thu 09 February 2012 10:05

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#25 Thu 09 February 2012 10:27

Re: [Openlayers] Créer une polyligne à partir de données X/Y

Code:

#26 Thu 09 February 2012 11:07

Re: [Openlayers] Créer une polyligne à partir de données X/Y

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#27 Thu 09 February 2012 11:54

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#28 Tue 21 February 2012 09:42

Re: [Openlayers] Créer une polyligne à partir de données X/Y

#29 Tue 13 March 2012 16:25

Re: [Openlayers] Créer une polyligne à partir de données X/Y

Code:

#30 Wed 14 March 2012 08:33

Re: [Openlayers] Créer une polyligne à partir de données X/Y

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