XML to map MapPolyline

filipdns

Hello,

I have to draw Polyline from xml file and with 2 lines coordinate, I know how to do example

But in some case , in the XML, I have a list of coordinates:

Do you know how can I split this list to an acceptable format for MapPolyline path?..

thank a lot

JonB

@filipdns
So you have to split that text yourself into the pairs of coordinates, which you will then pass to your "polyline" function call(s).

Whatever XML parser you use, you will come across an element whose name is Geometrie and whose value is the text. I forget whether you get that directly as the child, of whether the child is itself a text node with that value, but it's one or the other, can't be difficult for you to discover which.

Then you need to split the text. The parser may have retained the newlines you show, but I wouldn't bet on it --- it may have joined them with a space separator. But either way you can split into original "lines" by splitting on whitespace in your case, fortunately. Then obviously you split each line on comma to get the two coordinates out.

filipdns

@JonB Thank you very much.

To be sure I understand correctly, the pair of coordinates can be like 49.631389,5.887222 or the format has to be different?

what is the format for multiple pairs of coordinates?

I don't found any information in documentation about path format

JonB

@filipdns
Bear in mind: I don't use QML (or, for that matter, whatever your "Polyline" is)!

I don't know now what you're expecting, but I'm expecting you to have to write some code to read in that XML as an external file, parse it, and make calls to whatever the polyline drawer function is, all in Qt/C++. I thought that was what your question title was asking.

In which case, you will have to convert those individual coordinate strings to float/double/whatever Qt type is suitable, and then pass those to the "polyline draw" function. That will accept them as numbers, so "format" will not be an issue.

However, if you are expecting more of an answer like "you can just do such-and-such [perhaps in a QML file] from QML and it will draw the polyline for you itself directly from the <Geometrie> content, you don't need to write any code yourself" then I am not your guy. Perhaps you should wait a bit in case someone else knows better than what I am suggesting.

filipdns

@JonB I had made the code to read the XML already and I got the long list in Geometrie. Usually, I receive for each segment 4 lines : 2 lines for lat et 2 other for long, but here they put lot of pairs, there is my problem. In QML with pairs of coordinates I do:

Map {
    MapPolygon {
        color: 'green'
        path: [
            { latitude:49.559722,longitude:5.842222},
            { latitude:49.556944,longitude:5.836944},
            { latitude:49.551389,longitude:5.825833},
...
        ]
    }
}

but for the list of coordinates, I don't know how to format theme.

Example in GeoJson it's look like:

paths:[
[49.559722,5.842222],
[49.556944,5.836944],
[49.551389,5.825833],
...
]

that is why I talk about format

filipdns

@JonB I just found the page http://doc.qt.io/qt-5/qml-coordinate.html:

and coordinates can be like:

import QtPositioning 5.2

Location { coordinate: QtPositioning.coordinate(-27.5, 153.1) }

I will try that tomorrow morning ;-)

filipdns

Hello,

Here my first working attempt to use coordinates to build MapPolylines

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0
import QtQuick.XmlListModel 2.0
import QtLocation 5.10
import QtPositioning 5.10

ApplicationWindow {
    visible: true
    width: 1280
    height: 1024
    XmlListModel {
        id: assetsPolylineList
        source: "file:///E:/test.xml"

        query: "/SiaExport/Situation/BordureS/Bordure/Geometrie"
        property bool ready: false

        XmlRole { name: "country"; query: "string()" }

        onStatusChanged:  {
            ready = (status == XmlListModel.Ready)
            //switch (status) {
            //case XmlListModel.Ready:console.log("[READY]   '" + source + "' | "  + count + " items");
            //case XmlListModel.Error:console.log("[ERROR]   '" + source + "' | Error: ''" + errorString() + "'");
            //case XmlListModel.Loading:console.log("[LOADING] '" + source + "'")
            //}
            if(ready)
            {
                for (var i=0;i<count;i++)
                {
                    var second=assetsPolylineList.get(i).country

                    for(var j=0;(second.length)>1;j++)
                    {
                        var k = second.length
                        var third=second.replace("\n",";")
                        var forth= third.split(";")
                        var forth1= forth[0]
                        var forth2= forth[1]
                        if(String(forth2)!=='undefined')
                        {second=forth2}
                        else{second="0"}
                        var lat_long=forth1.split(",")
                        var latitude =lat_long[0]
                        var longitude =lat_long[1]

                        var fith=QtPositioning.coordinate(latitude, longitude)

                        if(i==0)
                        {assetsPolyline0.addCoordinate(fith)}
                        if(i==1)
                        {assetsPolyline1.addCoordinate(fith)}
                        if(i==2)
                        {assetsPolyline2.addCoordinate(fith)}
                        if(i==3)
                        {assetsPolyline3.addCoordinate(fith)}
                        if(i==4)
                        {assetsPolyline4.addCoordinate(fith)}
                        if(i==5)
                        {assetsPolyline5.addCoordinate(fith)}
                        if(i==6)
                        {assetsPolyline6.addCoordinate(fith)}
                        if(i==7)
                        {assetsPolyline7.addCoordinate(fith)}
                        if(i==8)
                        {assetsPolyline8.addCoordinate(fith)}
                        if(i==9)
                        {assetsPolyline9.addCoordinate(fith)}
                        if(i==10)
                        {assetsPolyline10.addCoordinate(fith)}
                        if(i==11)
                        {assetsPolyline11.addCoordinate(fith)}
                        if(i==12)
                        {assetsPolyline12.addCoordinate(fith)}
                        if(i==13)
                        {assetsPolyline13.addCoordinate(fith)}
                        if(i==14)
                        {assetsPolyline14.addCoordinate(fith)}
                        if(i==15)
                        {assetsPolyline15.addCoordinate(fith)}
                        if(i==16)
                        {assetsPolyline16.addCoordinate(fith)}
                        if(i==17)
                        {assetsPolyline17.addCoordinate(fith)}
                        if(i==18)
                        {assetsPolyline18.addCoordinate(fith)}
                        if(i==19)
                        {assetsPolyline19.addCoordinate(fith)}
                        if(i==20)
                        {assetsPolyline20.addCoordinate(fith)}
                        if(i==21)
                        {assetsPolyline21.addCoordinate(fith)}
                        if(i==22)
                        {assetsPolyline22.addCoordinate(fith)}
                        if(i==23)
                        {assetsPolyline23.addCoordinate(fith)}
                        if(i==24)
                        {assetsPolyline24.addCoordinate(fith)}
                        if(i==25)
                        {assetsPolyline25.addCoordinate(fith)}
                        if(i==26)
                        {assetsPolyline26.addCoordinate(fith)}
                        if(i==27)
                        {assetsPolyline27.addCoordinate(fith)}
                        if(i==28)
                        {assetsPolyline28.addCoordinate(fith)}
                        if(i==29)
                        {assetsPolyline29.addCoordinate(fith)}
                        if(i==30)
                        {assetsPolyline30.addCoordinate(fith)}
                        if(i==31)
                        {assetsPolyline31.addCoordinate(fith)}
                        if(i==32)
                        {assetsPolyline32.addCoordinate(fith)}
                        if(i==33)
                        {assetsPolyline33.addCoordinate(fith)}
                        if(i==34)
                        {assetsPolyline34.addCoordinate(fith)}
                        if(i==35)
                        {assetsPolyline35.addCoordinate(fith)}
                        if(i==36)
                        {assetsPolyline36.addCoordinate(fith)}
                        if(i==37)
                        {assetsPolyline37.addCoordinate(fith)}
                        if(i==38)
                        {assetsPolyline38.addCoordinate(fith)}
                        if(i==39)
                        {assetsPolyline39.addCoordinate(fith)}
                        if(i==40)
                        {assetsPolyline40.addCoordinate(fith)}
                    }
                }
            }
        }
    }


    Plugin {
        id: mapPlugin
        name: "esri" // "mapboxgl", "esri", "osm"...
    }

    Map {
        id:map
        anchors.fill: parent
        plugin: mapPlugin
        MapPolyline  {
            id:assetsPolyline0
        }
        MapPolyline  {
            id:assetsPolyline1
        }
        MapPolyline  {
            id:assetsPolyline2
        }
        MapPolyline  {
            id:assetsPolyline3
        }
        MapPolyline  {
            id:assetsPolyline4
        }
        MapPolyline  {
            id:assetsPolyline5
        }
        MapPolyline  {
            id:assetsPolyline6
        }
        MapPolyline  {
            id:assetsPolyline7
        }
        MapPolyline  {
            id:assetsPolyline8
        }
        MapPolyline  {
            id:assetsPolyline9
        }
        MapPolyline  {
            id:assetsPolyline10
        }
        MapPolyline  {
            id:assetsPolyline11
        }
        MapPolyline  {
            id:assetsPolyline12
        }
        MapPolyline  {
            id:assetsPolyline13
        }
        MapPolyline  {
            id:assetsPolyline14
        }
        MapPolyline  {
            id:assetsPolyline15
        }
        MapPolyline  {
            id:assetsPolyline16
        }
        MapPolyline  {
            id:assetsPolyline17
        }
        MapPolyline  {
            id:assetsPolyline18
        }
        MapPolyline  {
            id:assetsPolyline19
        }
        MapPolyline  {
            id:assetsPolyline20
        }
        MapPolyline  {
            id:assetsPolyline21
        }
        MapPolyline  {
            id:assetsPolyline22
        }
        MapPolyline  {
            id:assetsPolyline23
        }
        MapPolyline  {
            id:assetsPolyline24
        }
        MapPolyline  {
            id:assetsPolyline25
        }
        MapPolyline  {
            id:assetsPolyline26
        }
        MapPolyline  {
            id:assetsPolyline27
        }
        MapPolyline  {
            id:assetsPolyline28
        }
        MapPolyline  {
            id:assetsPolyline29
        }
        MapPolyline  {
            id:assetsPolyline30
        }
        MapPolyline  {
            id:assetsPolyline31
        }
        MapPolyline  {
            id:assetsPolyline32
        }
        MapPolyline  {
            id:assetsPolyline33
        }
        MapPolyline  {
            id:assetsPolyline34
        }
        MapPolyline  {
            id:assetsPolyline35
        }
        MapPolyline  {
            id:assetsPolyline36
        }
        MapPolyline  {
            id:assetsPolyline37
        }
        MapPolyline  {
            id:assetsPolyline38
        }
        MapPolyline  {
            id:assetsPolyline39
        }
        MapPolyline  {
            id:assetsPolyline40
        }
    }
}

Now I have to found how to replace

if(i==0)
{assetsPolyline0.addCoordinate(fith)}
...

    Map {
        id:map
        anchors.fill: parent
        plugin: mapPlugin

        MapPolyline  {
            id:assetsPolyline0
        }
...
}

by something like :

// NON WORKING EXAMPLE///

            if(ready)
            {
                for (var i=0;i<count;i++)
                {
                    var second=assetsPolylineList.get(i).country

                    for(var j=0;(second.length)>1;j++)
                    {
                        var k = second.length
                        var third=second.replace("\n",";")
                        var forth= third.split(";")
                        var forth1= forth[0]
                        var forth2= forth[1]
                        if(String(forth2)!=='undefined')
                        {second=forth2}
                        else{second="0"}
                        var lat_long=forth1.split(",")
                        var latitude =lat_long[0]
                        var longitude =lat_long[1]

                        var fith= Qt.createQmlObject('Import QtQuick 1.1, MapPolyLine{path:QtPositioning.coordinate(latitude, longitude)',map,main.qml)
                        }
                      }
                  }
            }
}

Because on my first working attempt I know I have 40 polylines but for other items in my xml, I will have much more and I would like to have them automatically created, I don't know if I'm clear enough lol