ReferenceError: "..." is not defined

[patcs]

Im trying run this code, and it lunch the error: ReferenceError: "vi" is not defined. someone who can help me, please?

import QtQuick 2.6
import QtQuick.Window 2.2
import QtQuick.Controls 2.1
import QtQml 2.2

Window {
id: window
visible: true
visibility: "FullScreen"

Item{
    property double xb: 0;
    property double yb: 0;
    property double vx: 0;
    property double vy: 0;
    property int tita: 45;
    property int vi: 20;
    property double g: 9.8;

    Timer {
        id:time
        interval: 500
        repeat: true
        running: true
        onTriggered:{
            vx = vi*cos(tita);
            vy = vi*sin(tita)-(g*time);
            xb =  vi*cos(tita)*time;
            yb = vi*sen(tita)*time-(1/2*(g*(time^2)));
            console.log(vx,vy,xb,yb)
        }

    }

}







Background{
id: background
}

Bird{
id: bird
x: 20
y: 600

    Behavior on x{
        NumberAnimation{
        duration: 600


        }
    }

}

MouseArea{
    anchors.fill: parent
    onClicked: {
        bird.z = bird.z +1
        bird.x= 1000
    }
}

Button {
text: "Salir"
onClicked: window.close()

}

}

[prasoon1338]

Please try to give id for your "Item" element, and try to access vi with "item_id.vi"

Item{
  id: myItem
  .... ..... ...
}

Timer{
 ....
 onTriggered :{
   myItem.vx = myItem.vi * cos(myItem.tita)
 }
}

[patcs]

Thank you, but it doesnt work! It works if I declare variables inside of the timer, but Im not sure if this are going to have any repercurssion in my final result.

[Pradeep P N]

Hi Patcs,

Move the Timer out of Item and use Math operation as bellow

Window {
id: window
visible: true

// Item{
property double xb: 0;
property double yb: 0;
property double vx: 0;
property double vy: 0;
property int tita: 45;
property int vi: 20;
property double g: 9.8;

    Timer {
        id:time
        interval: 500
        repeat: true
        running: true
        onTriggered:{
            vx = vi * Math.cos(tita);
            vy = vi * Math.sin(tita)-(g*time);
            xb = vi * Math.cos(tita) * time;
            yb = vi * Math.sin(tita) * time-(1/2*(g*(time^2)));
            console.log(vx,vy,xb,yb)
        }
    }

// }
}

The properties belongs to Window. And what you represent "time" in your calculation. time is id for Timer

[patcs]

I was trying and the only solution that I found was this:

import QtQuick 2.6
import QtQuick.Window 2.2
import QtQuick.Controls 2.1
import QtQml 2.2

Window {
id: window
visible: true
visibility: "FullScreen"

Item{

Timer {
    id:time
    interval: 500
    repeat: true
    running: true

    property double xb: 0;
    property double yb: 0;
    property double vx: 0;
    property double vy: 0;
    property int tita: 45;
    property int vi: 20;
    property double g: 9.8;

    onTriggered:{
        vx = vi*cos(tita);
        vy = vi*sin(tita)-(g*time);
        xb =  vi*cos(tita)*time;
        yb = vi*sen(tita)*time-(1/2*(g*(time^2)));
        console.log(vx,vy,xb,yb)
    }

}

}

Background{
id: background
}

Bird{
id: bird
x: 20
y: 600

Behavior on x{
    NumberAnimation{
    duration: 600


    }
}

}

MouseArea{
anchors.fill: parent
onClicked: {
bird.z = bird.z +1
bird.x= 1000
}
}
Button {
text: "Salir"
onClicked: window.close()

}
}

So, if someone need the solution, i found this, however I dont know if it is the best one. Thank you to everyone who have helped me!