Particles Emitter.burst(count, int x, int y) not working(((

Galbarad

Hi all,
I have a small problem with Emitter looks like method burst(count, int x, int y) not working properly or I have a problem with understanding doc)
problem - burst generate particale in RANDOM place but NOT in (x, y) point(
Qt 5.13.0
ok, so my code is

import QtQuick 2.12
import QtQuick.Particles 2.13

Item {
   id: gameField
   anchors.fill: parent

   property double lastTouchX: 0
   property double lastTouchY: 0
   property int touchCount: 0

   MultiPointTouchArea {
       id: mptaMain
       anchors.fill: parent
       minimumTouchPoints: 1
       maximumTouchPoints: 1
       mouseEnabled: true

       property int pointCount:0

       touchPoints: [
           TouchPoint { id: point1 }
       ]

       onPressed: updatePointCount()
       onReleased: updatePointCount()
       onTouchUpdated: updatePointCount()

       function updatePointCount() {
           if (point1.pressed) {
               lastTouchX = point1.x;
               lastTouchY = point1.y;
               ++touchCount;
           }
       }
   }

   ParticleSystem {
       id: psMain
   }

   Emitter {
       id: eLight
       anchors.fill: parent
       system: psMain
       size: 10
       endSize: 50
       enabled: false
       group: "light"

       ImageParticle {
           id:  ipLight
           color: "red"
           system: psMain
           source: "qrc:///res/particle.png"
           anchors.fill: parent
           clip: true
           groups: ["light"]
       }

       lifeSpan: 1000
   }

   Timer {
       id: tMain;
       interval: 30;
       running: false;
       repeat: true
       onTriggered: {
           if (lastTouchX && lastTouchY && touchCount) {
               eLight.burst(touchCount, lastTouchX, lastTouchY); // there is a problem
               lastTouchX = 0;
               lastTouchY = 0;
               touchCount = 0;
           }
       }
   }
   
   function creationFinished() {
       console.log("GameField.creationFinished", height_koeff, width, height);

       eLight.size *= height_koeff;
       eLight.endSize *= height_koeff;

       tMain.start();
   }
}

thanks for help)

Galbarad

ok, I read doc one more time and understand that burst(count, int x, int y) "move" Emitter to point (x, y)
so only one possible way create track for cursor is in Emitter.onEmitParticles signal

perhaps is possible emit particle in one emitter and show it on another canvas?
thanks