QT图表QML滚动X轴（毫秒）

我试图在QT图表QML中显示实时数据

我用计时器每25毫秒更新一次Y值 x轴应显示动态5秒窗口（当前时间+-2500毫秒）。如何使x轴动态显示实时更新的5秒窗口

到目前为止，我的计时器是正确的，每25毫秒触发一次

我修改了其中一个QT示例，到目前为止，实时更新工作正常

import QtQuick 2.0
import QtCharts 2.0

Item {
    anchors.fill: parent

    property double startTime: 0

    ChartView {
        title: startTime
        anchors.fill: parent
        legend.visible: false
        antialiasing: true

        ValueAxis {
            id: axisX
            min: 0
            max: 10
            tickCount: 5
        }

        ValueAxis {
            id: axisY1
            min: -0.5
            max: 1.5
        }
        ValueAxis {
            id: axisY2
            min: 0
            max: 1000
        }

        SplineSeries {
            id: series1
            axisX: axisX
            axisY: axisY1
        }

        SplineSeries {
            id: series2
            axisX: axisX
            axisY: axisY2
        }
    }

    // Add data dynamically to the series
    Timer {
        id: refreshTimer
        interval: 25
        running: true
        repeat: true
        onTriggered: {
            series1.append(2, Dashboard.gpsSpeed);
            series2.append(10, Dashboard.gpsAltitude);
            console.log ("Timer Triggered");
    }
 }

}

---

这就是我的代码现在的样子，我还删除了用户不再可见的数据点

// Add data dynamically to the series
Timer {
    property int amountOfData: 0 //So we know when we need to start
    property int timeline: 0 // Start of the timeline
    id: refreshTimer
    interval: 50
    running: false
    repeat: true
    onTriggered: {
        timeline++;
        series1.append(timeline, Dashboard.revs);
        series2.append(timeline, Dashboard.speed);

        if(amountOfData > axisX.max){
            axisX.min++;
            axisX.max++;
        }else{
            amountOfData++; //This else is just to stop incrementing the variable unnecessarily
        }
        //remove all data points that are not visible anymore
        if (timeline > 100){
            series1.remove(1);
            series2.remove(1);


        }
    }
}

---

如果我理解正确，您希望x轴与当前数据动态滚动。因此，需要调整相应轴的“最小”和“最大”属性

Timer{
    property int amountOfData: 0 //So we know when we need to start scrolling
    id: refreshTimer
    interval: 25
    running: true 
    repeat: true
    onTriggered: {
        series1.append(2, Dashboard.gpsSpeed);
        series2.append(10, Dashboard.gpsAltitude);

        if(amountOfData > axisX.max){
            axisX.min++;
            axisX.max++;
        }else{
            amountOfData++; //This else is just to stop incrementing the variable unnecessarily
        }
    }
}

---

我是否正确理解您希望x轴能够动态滚动？是的，正是这样不幸的是，if（timeline>100）{series1.remove（1）；series2.remove（1）；出于某种原因也会删除屏幕上的数据。我也尝试过删除（0），但也会删除屏幕上的数据。不确定我在这里做错了什么