Collision between two objects

patcs

Hi, everyone.
Im doing a game similar to angry birds, but now my problem is that i dont know how recognize when the bird and the box have collided and then the box move. Im trying do it with a timer(id collide box) but I can't start it just when the bird and the box are in the same position, it always start before the collision. I dont know if it will be possible in other way.

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

Window {

//definición de la pantalla de juego como pantalla completa.
id: window
visible: true
visibility: "FullScreen"

Item{


    Timer {
        id:move

        interval: 10
        repeat: true
        running: false

//definición de las variables tita, velocidad inicial y gravedad
property double tita: -Math.PI/3
property int vi: 30
property double g: 3

//cuando choca contra las paredes rebota con una velocidad de signo contrario

        onTriggered:{


            if(bird.x > 1300)
                bird.vx = -bird.vx;
            if (bird.y >= 650)
                bird.vy = -bird.vy;
            if(bird.x < 0)
                bird.vx = -bird.vx;
            if(bird.y< 0)
                bird.vy = -bird.vy;

//movimiento del pollito con un tiro parabólico
bird.vy = bird.vy - (g/2)
bird.x= bird.x +(bird.vx)
bird.y= bird.y -(bird.vy)

//fondo del juego
Background{
id: background
}

//posición y velocidad inicial del pollito.
Bird{
id: bird
x: 100
y: 550
property double vx: move.viMath.cos(move.tita)
property double vy: move.viMath.sin(-move.tita)

//el tiempo que va a tardar en moverse en cada iteracción en el eje x
Behavior on x{
NumberAnimation{
duration: 10

        }
    }

//el tiempo que va a tardar en moverse en cada iteracción en el eje y
Behavior on y{
NumberAnimation{
duration:10
}
}

//posición del velocimetro
Speedometer{
id: speedometer
x:-100
y:620
}

//definición de las características de la flecha del indicador de velocidad
Needle{
id: needle
x:-100
y:620

   transform: Rotation{
        id: rotation1

         origin.x: 125; origin.y: 125

         RotationAnimation on angle { //rotación desde 0 a -90 grados
             id: counterclockwise
             from: 0
             to: -90
             running: false
             duration: 2000
             direction: RotationAnimation.Counterclockwise
             loops: Animation.Infinite
         }

         RotationAnimation on angle{ //rotación desde los -90 hasta los 0 grados
             id:clockwise
             from: -90
             to: 0
             running: false
             duration: 2000
             direction: RotationAnimation.Clockwise
             loops: Animation.Infinite

         }
    }



           Timer{ //la rotación de la aguja en cada diracción va a tardar 2 segundos
               id:moveNeedle
               interval: 2000
               repeat: true
               running: true
               property bool titaNeedle: false

               onTriggered: { //cambio de sentido (al contrario de las agujas del reloj)
                   if(titaNeedle == false){
                      counterclockwise.running = true
                       titaNeedle = true
                       clockwise.running = false


                   }else{ //cambio de sentido (en el sentido de las agujas del reloj)
                    titaNeedle = false
                       clockwise.running = true
                       counterclockwise.running = false

                   }


               }



            }

           Timer{
               id: angleNeedle
               running: true
               repeat: true
               interval: 1
               property double angle: 0
               onTriggered: {
                   if(counterclockwise.running == true){
                        angle = angle +(-90/2000)
                        console.log(angle)
                   }
                   else if(clockwise.running == true){
                        angle = angle -(-90/2000)
                        console.log(angle)
                   }

               }
           }

   }


Box{
    id:box
    x:1100
    y:625
    property double vx: 0
    property double vy: 0


}




Timer {
    id:collideBox

    interval: 10
    repeat: true
    running: false

//definición de las variable gravedad

    property double g: 9.8



    onTriggered:{


        if(bird.x == box.x)
            box.vx = bird.vx;
        if (bird.y == box.y)
            box.vy = bird.vy

//movimiento del caja con un tiro parabólico
box.vy = box.vy - (g/2)
box.x= box.x +(box.vx)
box.y= box.y -(box.vy)

    }

}

}

//definición de la acción que se va a realizar cuando se pulse el ratón
MouseArea{
id: mouse
anchors.fill: parent
onClicked: {

       move.running = true
       }



    }

//botón posicionado arriba y a la izquierda para poder salir de pantalla completa

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

}

Lorenz

Hi patcs,

I strongly recommend to use a dedicated Game Engine like V-Play for tasks like these. It will make your life so much easier.

Using V-Play, V-Play, you can use the BoxCollider item and have a look at a full example that will show you how to handle collisions (especially with boxes) properly.

Additionally, the Box2D physics engine, that is built into V-Play, will help you create a more realistic parabolic trajectory.

Cheers,
Lorenz

patcs

Thanks, Lorenz.
I could use V-Play with QML?

patcs

Ok, I saw that I can!
Im going to try, thanks a lot, I was going crazy!

Lorenz

You're lucky, V-Play is completely based on development with QML :)

Drop us a line at support@v-play.net if you have any questions.

patcs

@Lorenz I downloaded V-Play but when I try use for example BoxCollider It send a error: Type BoxCollider unavailable.

I have to say you that I open the project that I was doing in Qml language so, I dont know if I have import some more libreries apart from VPlay 2.0

thanks!

Lorenz

Hi,

It's best to ask V-Play specific Questions directly on our forums.

Check out this post by on how to add V-Play to an existing project:
https://v-play.net/developers/forums/t/can-we-use-v-play-components-in-a-qt-quick-controls-2-application#post-16126

Best,
Lorenz