单击LineSeries时获取QML ChartView LineSeries的名称

时间:2017-11-12 13:36:43

标签: qt qml lineseries

我创建了一个程序,从互联网上读取股票数据(时间序列)并将其显示在QML ChartView中。在我添加了我想要的所有系列之后,我可以通过单击按钮删除它们。

我想知道是否可以通过点击系列中的任何一点来删除系列线?

我正在动态添加这个系列:

// stockID is sent from C++ when the timeSeriesReady signal is emitted
var chartViewSeries = chartView.createSeries(ChartView.SeriesTypeLine, stockID, dateTimeAxis_chartView_xAxis, valueAxis_chartView_yAxis);

// Set chartViewSeries (AbstractSeries/LineSeries) properties
chartViewSeries.onClicked.connect(lineSeriesClicked);
chartViewSeries.onHovered.connect(lineSeriesHovered);

stockChart.setLineSeries(chartViewSeries);

我不想过多地张贴我的帖子,所以我不会发布所有文件,但是:

  • dateTimeAxis_chartView_xAxis是主要ChartView QML typ中的DateTimeAxis QML类型,ID为:chartView
  • valueAxis_chartView_yAxis是主要ChartView QML typ中的ValueAxis QML类型,带有id:chartView
  • stockChart是从C ++导入的StockChart QML类型的ID
  • lineSeriesClicked是这个功能:

    function lineSeriesClicked(lineSeriesPoint){
        console.log(lineSeriesPoint);
    }
    
  • lineSeriesHovered是这个函数:

    function lineSeriesHovered(lineSeriesPoint, isHovered){
        if(isHovered){
            var date = new Date(lineSeriesPoint.x);
            console.log(date.getFullYear() + "-" + (((date.getMonth()+1) < 10) ? ("0" + (date.getMonth()+1).toString()) : (date.getMonth()+1)) + "-" + (((date.getDate()) < 10) ? ("0" + (date.getDate()).toString()) : (date.getDate())) + " -> " + lineSeriesPoint.y);
        }
    }
    

现在,在日志中我会看到所有正确的数据,例如,悬停时:

qml: 2017-08-29 -> 64.91115963918442

点击时:

qml: QPointF(1.50432e+12, 65.0453)

查看XYSeries QML类型(https://doc.qt.io/qt-5/qml-qtcharts-xyseries.html#clicked-signal),我使用的点击信号只传递了一个点。

有没有办法获得获得点数据的系列名称能够删除这个系列?也许通过某种上下文访问或&#34;这个&#34;关键字?

非常感谢!!!

1 个答案:

答案 0 :(得分:1)

我不知道你是否解决了这个问题,但仅仅是为了解决问题......我可以使用model-view-delegate来解决它。在我的例子中,我使用传感器数据生成图形,我希望我可以通过系列连接不同的图形(例如,饼图和线条)。标签。我可以使用这个model-view-delegate透视图来完成它。我这样想出来了:

import QtQuick 2.2
import QtQuick.Controls 2.3
import QtQuick.Window 2.10
import QtQuick.Layouts 1.3
import QtDataVisualization 1.2
import QtCharts 2.2
import Qt3D.Input 2.0
// I imported more than I used because it's a part of a big project...
Item{
    id: mainWindow

    ListModel{
        id: jsonData
        Component.onCompleted: // line
        {

            //create a request and tell it where the json that I want is
            var req = new XMLHttpRequest();
            var location = "URL-to-JSON-DATA"

            //tell the request to go ahead and get the json

            req.open("GET", location, true);
            req.send(null);

            //wait until the readyState is 4, which means the json is ready
            req.onreadystatechange = function()

            {
                console.log("Req status:"+req.status+"("+req.readyState+")");
                if (req.readyState == 4)
                {
                    //turn the text in a javascript object while setting the ListView's model to it
                    if (req.responseText){
                        var result = JSON.parse(req.responseText);
                        for (var i =0; i < result.rows.length;i++){
                            // map the Json to a model

                            jsonData.append({"sensor":result['rows'][i]['value'][0],"activePower": result['rows'][i]['value'][1],"voltage":result['rows'][i]['value'][2], "current":result['rows'][i]['value'][3], "year":result['rows'][i]['key'][0],"month": result['rows'][i]['key'][1],"day":result['rows'][i]['key'][2], "hour":result['rows'][i]['key'][3], "minute":result['rows'][i]['key'][4] })


                        };
                        //Sucess string
                        console.log("JSON [Sensor,Date,Hour] loaded");
                        //Fail string :(
                    } else {console.log("Empty[Sensor,Date,Hour JSON");}
                }
            }

        }




    }

    ChartView {
        title: "Line"
        id: mainChart
        anchors.fill: parent
        antialiasing: true

        Repeater{
            model: jsonData
            Item {
                Component.onCompleted: {

                    if( mainChart.series(sensor)) {
                        mainChart.series(sensor).append(10,activePower);
                    } else{
                        mainChart.createSeries(ChartView.SeriesTypeLine,sensor,lineXOrdinate,lineYOrdinate );
                        mainChart.series(sensor).append(hour+(minute*0.5)/30,activePower);
                        mainChart.series(sensor).hovered.connect(
                                                                    function (point,state){
                                                                        if (state){
                                                                            console.log(">>>"+sensor); // print the Series label =D


                                                                        } 


                                                                    });


                    }
                    if(activePower > lineYOrdinate.max){ // if the highest value is above the Y axis, reset it to value+10
                        lineYOrdinate.max = activePower +10;
                    }

                }
            }
        }

    }






    ValueAxis {
        id: lineYOrdinate
        min:0
        max:11
    }

    ValueAxis {
        id: lineXOrdinate
        min:0
        max:24
    }


}

X轴长24个值,因为我映射了一天。 我希望这个帮助=)