Error message with JpGraph

[eongibier]

Hello

I made this script with JpGraph. Unfortunately I have a mistake and I have been looking for a long time to find the reason.
Can you help me.
Thank you.
Serge

<?php

/**
 * RELEVES DE TEMPERATURE SUR 24H
 * STATION 
 */
require_once('jpgraph/jpgraph.php');
require_once('jpgraph/jpgraph_line.php');

$stream = fopen("https://****.net/mor***/customtextout.txt", "r");
$releves = [];

while ($line = fgets($stream)) {
    $decoded_line = explode(" ", $line);
    if (substr($decoded_line[0], 4) == "0") {
        $releves[$decoded_line[0]] = $decoded_line[1];
    }
}

// Création du graphique
$graph = new Graph(1000, 500, 'auto'); // Ici les deux premiers paramètres sont la largeur puis la hauteur de l'image en pixels
$graph->SetScale("textlin");
$graph->SetAxisStyle(AXSTYLE_YBOXIN);
$graph->title->Set("Température sur 24h - Station du Morvan");


$graph->yaxis->HideLine(false);
$graph->yaxis->HideTicks(false, false);
$graph->yaxis->title->Set('°C');
$graph->yaxis->SetColor('blue');
$graph->ygrid->SetFill(false);


$graph->xaxis->HideLine(false);
$graph->xaxis->HideTicks(false, false);
$graph->xaxis->SetTickLabels(array_keys($releves));
$graph->xaxis->SetLabelAngle(90);
$graph->xgrid->SetFill(false);
$graph->xgrid->Show(); 

// Créer les lignes
$lineplot = new LinePlot(array_values($releves));
$lineplot->SetColor('blue');
$lineplot->SetWeight(2);
$graph->Add($lineplot);
$lineplot->value->SetAngle(45);
$lineplot->value->Show();

// Sortie de l'image
$graph->Stroke();

[pwsdashboard]

Are you using the latest version from JpGraph - Most powerful PHP-driven charts ?
07 Aug: JpGraph-4.4.2 (4.4.2)
Support PHP8.2

I copied your script and run it with that version, no errors

Wim

[eongibier]

Thank you for this information. It works.
I’m looking for ways to increase the pace of updates. The current step of my readings is 10 minutes and I want a step of 60 minutes as a way to do it.

Thank you.

Serge

[administrator]

I’ve not used JpGraph for many years but I would have thought the way to do that was to average your 10 minute values into 60 minute values in PHP and then plot the 60 minute values.

[eongibier]

(Translate)
Hello
Indeed, I followed your instructions and I changed the pitch of the readings in 60 minutes.
Thank you.

Serge

[eongibier]

I rewrote the following script with a 30-minute step, it works wonderfully; People are interested.
Serge

<?php

/**
 * RELEVES DE TEMPERATURE SUR 24H
 * STATION DU MORVAN
 * @version 2 - Ajout de null checks, prise en charge du cas où les relevés s'étalent sur plus de 24 heures
 */
require_once('jpgraph/jpgraph.php');
require_once('jpgraph/jpgraph_line.php');

// Ouvrir le fichier
$stream = fopen("https://****.net/mo***/customtextout.txt", "r");
if ($stream === false) throw new RuntimeException("Could not read https://****.net/mor***/customtextout.txt");

// Lire les lignes une par une et répertorier celles qui sont à une dizaine de minutes rondes
$labels = [];
$values = [];
while ($line = fgets($stream)) {
    $decoded_line = explode(" ", $line);
    if ($decoded_line === false) continue;
    if (substr($decoded_line[0], 4) == "0") {
        $labels[] = $decoded_line[0];
        $values[] = $decoded_line[1];
    }
}

// S'il y a plus de 48 valeurs relevées, alors ne prendre en compte que les 48 dernières
// En sachant qu'elles sont listées dans l'ordre chronologique
if(count($values) > 48) {
    $values = array_slice($values, count($values) - 48);
    $labels = array_slice($labels, count($labels) - 48);
}

// Fermer le fichier
fclose($stream);

// Création du graphique
$graph = new Graph(960, 300, 'auto'); // Ici les deux premiers paramètres sont la largeur puis la hauteur de l'image en pixels
$graph->SetScale("textlin");

$graph->title->Set("Températures sur 24h glissantes à la station météorologique du chalet de Préperny (commune de Arleuf)");

$graph->yaxis->HideLine(false);
$graph->yaxis->HideTicks(false, false);
$graph->yaxis->title->Set('°C');
$graph->yaxis->SetColor('blue');

$graph->xaxis->HideLine(false);
$graph->xaxis->HideTicks(false, false);
$graph->xaxis->SetTickLabels($labels);
$graph->xaxis->SetLabelAngle(90);
$graph->xgrid->SetFill(false);
$graph->xgrid->Show();

// Créer les lignes
$lineplot = new LinePlot($values);
$lineplot->SetColor('blue');

$graph->Add($lineplot);
$lineplot->value->SetAngle(45);
$lineplot->value->Show();

// Sortie de l'image
$graph->Stroke();