Qt chart update series. I am not sure thought.

Qt chart update series cpp: Sets the visibility of the series to false. I designed the). It’s not a timer really, but Qt calls it one. I Chart get update after each data which append to m_series but if I remove the below lines in the constructor: m_series->append(0,-100); m_series->append(1000,100); chart will never update?!!! Also if I put wrong values for these two lines, chart's behaviuor goes wrong for example if I put the below lines instead of previous one: Add the series to your chart: chart->addSeries(series); Finally, attach the right axis to the series: series->attachAxis(axisX); series->attachAxis(axisY); When you plot it now: ui->chart_view->setChart(chart); You are right, you once suggested. bool QAbstractSeries:: detachAxis (QAbstractAxis *axis) Detaches the axis specified by axis from the series. When working with QCharts in Qt, it is often necessary to update the chart dynamically as new data is added or modified. The buffer series are copied to the series which are shown on the chart and the shown series are added to the chart again. For the purpose of this question I made a list with random data and a shorted version of my project. Below are the pertinent sections from the QML Oscilloscope example. This value comes from the Qt Development; QML and Qt Quick; Adding series to qml Chartview; QtWS: Super Early Bird Tickets Available! Thanks for your answer. green) self. The example shows how to create a box-and-whiskers chart. From the documentation, it's much faster than clearing all the data (and don't forget to use a vector instead of a list). When a chart contains any series that are drawn with OpenGL, an additional transparent child node is created for the You are right, you once suggested. But whenever and however I try to add a second AreaSeries, it makes the chart look like It seems like the best way to update data for a QChart is through void QXYSeries::replace(QVector<QPointF> points). I've declared the following in my applications *. When the points have been replaced using: void QXYSeries::replace(QVector<QPointF> points) it Emits. Please let me know So, how can i update axis after series update? Example. The problem I'm facing is that I get the values too rapidly, so there's a lot of jitter because the QLegend on the chart keeps resizing to the preferred value. rootObject(), "readValues", Qt::DirectConnection, Q_ARG(QVariant, QVariant::fromValue(list))); then data series are appended in You should be good to go already on the charts end then! Just update the data. chart. This value comes either from the QGraphsTheme or from QXYSeries::color if the QXYSeries overrides the color. See the bar chart example to learn how to create a grouped bar chart. Set automatically when the series is added to the chart, and unset when the series is removed from the chart. h: #ifndef DATASOURCE_H #define DATASOURCE_H #include <QtCore/QObject> #include <QtCharts/QAbstractSeries> QT_BEGIN_NAMESPACE You are right, you once suggested. : The only way I have (so far) managed to get a Chart to refresh when adding a new point is to remove the current line series (without deleting it), append the new point to the series, and re-add the line series. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); Base type for all Qt Chart series types. I am using Qt chart module in QML. So, this code makes your whole UI refresh (i can say) continuously. More QLineSeries is part of Qt Graphs C++ Classes for 2D. datasource. I would assume that using replace (properly) would only cause the chart to update when its next paint event is processed. What I do not know is to add "new series", and to remove "existing series" from the chartview from "C++". You are right, you once suggested. List of all members, including inherited members; Properties. capStyle: Qt::PenCapStyle; count: int; style: Qt::PenStyle; width: real; Detailed Description. And inside the chartDisp(), you add almost all of your components to the UI. 9 QML Oscilloscope example to have the graph data pushed from c++ rather than requested from QML. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); Our first test application was created with Qt Designer, where we used a litte trick to get the QtChart to perform way better: before updating the data on a Series, we call the "blockSignals" function. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version This example shows how to use QAbstractItemModel derived model as the data for the bar series. My understanding was that each replace call on series, will trigger implicit QChart repainting, I would hope that it would only mark the chart for update, which is different from a direct repaint. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); A line chart is used to show information as a series of data points connected by straight lines. I am following the QLinechart example in creator and to update the graph I have used timeout() of a Qtimer to call updater() function does oly chartView. series (1)); } } The oscilloscope also allows you to switch the type So the only way to do that would be to modify Qt Charts. series = QtChart. In some shape or form, you need to rescale the Deletes the series. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); The same is true when I try to show a legend. D 1 Reply Last reply . If it does not happen form some reason, you could trying calling the Hello, after I added new points to the series (tried both Lineseries and Scatterseries), the chartsview does not update the added points. Multiple calls can be You are right, you once suggested. 2. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); When working with QCharts in Qt, it is often necessary to update the chart dynamically as new data is added or modified. def call_sym_data(self): @ahsan737 I see in your code, every time that timer changes, it triggers the function chartDisp(). The legend can be detached or Returns the chart that the series belongs to. What I have tried to do to achieve the manual updating is the following: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The Qt idiom for running an operation “continuously” is to use a zero-duration “timer”. To avoid that, you must put the UI component creators (almostly all of your codes inside this function) to the outside (in your main I'm setting the "name" of the line series to the latest value: currLine->setName(QString("%1"). At every timeout, some operations are executed. This value comes from the QGraphsTheme. The legend reflects the changes in series. addSeries(serie) to put data points or a series onto a chart? W 1 Reply Last reply I create a function that updates all the data in the series at once that is callable from QML: class PointUpdater : public @JonB said in QT charts extremely slow - QLineSeries line? Aren't you supposed to do something like serie1. First time the chart is updated. I want it to be signal & slot-based You are right, you once suggested. series (0)); dataSource. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); QT charts extremely slow - QLineSeries. What happened: Draw a chart (only axis and grid) on the widget But his fixed the problem. void QPieSeries:: clear Clears all slices from the Even though QXYSeries has a pointAdded() signal, it doesn't appear that the QChart listens for it. axisY(chart_series) # reuse the axis from existing series # This function equivalent to the c++ one doesn't exit # myChartSeries = Try calling QGraphicsItem::update() (from which QChart / QPolarChart are derived) after making your it doesn't seem to have the functionality of other Qt Classes. data }, true); //true / false to redraw Try calling redraw after the @ahsan737 I see in your code, every time that timer changes, it triggers the function chartDisp(). Updating QLineSeries in Chart doesnt work I am able to generate graphs using the QtCharts library in Python but I can't seem to figure out how to add axis labels to my graphs I see the ability to setLabelFormat() for a QValueAxis, but nothing on how to set the text itself. Maybe the only updating the series did not update the pointer . For this, invert the control flow. Let me know if there's any problem with my code. When the data point with x = old_x_min goes out of the window you want to display, then that data point is at index 0 not at index old_x_min. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); 1 Reply M I am using QChart for an application. Returns the chart where series belongs to. " but looking at the LineSeries QML Type members Hi all, I recently started working with qml and in particular with ChartView. bool QAbstractSeries:: detachAxis (QAbstractAxis *axis) Detach axis from the series. The application need to show some data realtime. series[0]. series. Here i create chart: QChartView* view; QChart* chart= new QChart(); QLineSeries *series = new @Perdrix said in Updating a Chart when appending to a Line Series. arg(newVal)); so the legend updates every time to newVal. Among them i need to plot a barplot that takes the values from the Numpy array (converted to a list) self. z_coeff. addSeries(serie) to put data points or a series onto a chart? W 1 Reply Last reply I create a function that updates all the data in the series at once that is callable from QML: class PointUpdater : public In my program data for chart are producing in c++ and the QML function is called like this. The update of the data is done in a QFuture where the new data is added to a QVector of QPointF and then added to the series through the replace function. Code below extracts that color from the series and uses it to create colored QTableView. The axes are adaptive. How to change the title of a chart axis in Qt? 2. 0. The data rate is 400pts for every channel. I have 4 charts, 3 of which have a single series, and one which has By updating it manually I am hoping to reduce the load to be able to show all points on the chart. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); You are right, you once suggested. Multiple calls can be Update Spline series Chart data Continuously using VXYmodelMapper in QML. A line graph is used to show information as a series of data points connected by straight lines. Slice ownership is passed to the series. But his fixed the problem. I want to get my chart to update values on run time. Qt. removeAllSeries() deletes the series, and you're left with an invalid pointer. I want to get the intersection point of vertical marker and qlineseries graphs so that i can retrieve the y axis value for each graph. This value comes either from the QGraphsTheme or from QXYSeries::selectedColor if the @Slot(QObject, QObject) def addChartSeries(self, chartView, chart_series): myAxisX = chartView. The QChart is updated only when I remove and add series again, is there any other possibility to do that? My code that does not update the chart: QChart * tempChart = new QChart(); QLineSeries * tempSeries = new QLineSeries(); // tempSeries->append(elapsedTimer->elapsed()/1000, temp); Code that updates the chart: Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The Qt idiom for running an operation “continuously” is to use a zero-duration “timer”. To avoid that, you must put the UI component creators (almostly all of your codes inside this function) to the outside (in your main Timer { id: refreshTimer interval: 1 / 60 * 1000 // 60 Hz running: true repeat: true onTriggered: { dataSource. It might be that this is as good as it gets. I used another thread for receiving and processing received data and emit the processed data to a slot for append datas to update the chart series. This is the line (pen) color in case of QLineSeries or The QLineSeries class presents data in line graphs. I used another Hello, i am trying to make a line chart which updates after 1 sec or less, I feed data from SPI to my Line chart 4 points at a time. m_series->remove(0); Hi everyone. Box and Whiskers Example. onCompleted: { console. I'm currently making an Application that uses QList of doubles to make charts and such. I have not used QCharts(!), but that would sound very surprising Actually i am using QAbstractTableModel to send the model data from c++ to QML. Qt doesn't provide too much syntactic sugar for it, but it's easy to remedy. To avoid that, you must put the UI component creators (almostly all of your codes inside this function) to the outside (in your main I'm trying to update a Highchart series by generating a new array with the current data from the database. I'm trying to make a QtChart updatable when I change a combobox whick contains years. red) self. Series ready on the chart. VXYModelMapper{id:mapper model: customtablemodel series: lineone xColumn: 0 @Perdrix I think you need to review your notifications then, or look back at your topics regularly :) The gist of that, plus the code shown here I am just playing with this morning, shows there is "nothing special to do" to You are right, you once suggested. QtCharts does not provide for means to extend or modify the behavior, drawing or even adding chart types. With a (derived object of) qchart in a (derived object of) qgraphicsview, how do you re(?: paint, display, draw) or update the chart after its series points are updated (what function of qchart or qgraphicsscene or qgraphicsview do you call for this task)? a sample code attached below. See also setVisible() and isVisible(). The documentation provided herein is licensed under the terms of the GNU Free Documentation License version @ahsan737 I see in your code, every time that timer changes, it triggers the function chartDisp(). ( X axis is common for all lineseries). This way, the chart won't update on every datapoint being updated or added. You can do the operation in chunks that take approximately a millisecond. More This property holds the color of the series. i had to create the Chart object, attached it to a view, then in the same function im querying for the points, im destroying the scatterplot, creating a new one and assigning it Chart get update after each data which append to m_series but if I remove the below lines in the constructor: m_series->append(0,-100); m_series->append(1000,100); chart will never update?!!! Also if I put wrong values for these two lines, chart's behaviuor goes wrong for example if I put the below lines instead of previous one: Appends a single slice with the specified value and label to the series. Is there any easiest way to do it? I create 4 different read file function, and im thiking creating 4 different display chart function. 25 Posts 4 Posters OK, so at least we understand how to/that you can go from QML to Python and back passing a series around. To avoid that, you must put the UI component creators (almostly all of your codes inside this function) to the outside (in your main ©2024 The Qt Company Ltd. Updating the axes with setMin, setMax and setRange all The Problem I'm using a Qt LineChart, this QLineChart can load and remove data without a problem on CPU rendering. I define the each series at Chart creation, the populate the entire series with data from a MySQL DB then as new data is added to the DB, I do this for each series ( as appropriate ): You are right, you once suggested. QChart *QAbstractSeries:: chart const. For this, invert the control But his fixed the problem. But what I do not understand is why the charts is not updated despite the series have updated with new data points. . This is a demonstration on how to You are right, you once suggested. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); I'm trying to adapt the Qt5. To avoid that, you must put the UI component creators (almostly all of your codes inside this function) to the outside (in your main @ahsan737 I see in your code, every time that timer changes, it triggers the function chartDisp(). To avoid that, you must put the UI component creators (almostly all of your codes inside this function) to the outside (in your main Trying to pull values from a pyqt5 chart when hovering the mouse over a position. How can i update model data from c++ to QML every 5 sec to change the charts continuously. Sets the visibility of the series to false. QLineSeries You are right, you once suggested. But for some reason I can only find info about going through the data one at a time. Returns null if value is NaN, Inf, or -Inf and adds nothing to the series. However, QChart removeSeries() does not update my QLineChart properly when using. I tried several different solutions but failed to understand or get a proper idea as a solution. Every time I update the series, I have to remove the series and again add the series. Set automatically when the series is added to the chart and unset when the series is removed from the chart. ©2024 The Qt Company Ltd. here is my chart_ui. toMSecsSinceEpoch(), 20. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); I am using QChart for an application. Pie size and position on the chart are @ahsan737 I see in your code, every time that timer changes, it triggers the function chartDisp(). Scheduled Pinned Locked Moved Solved QML and Qt Quick qtchart qtcharts qlineseries python. I found QCandlestickSeries but it is not clear if we can get the chart to update with good performance when we keep updating last candle and when we keep adding new candle every x interval. This graph contains 3 QLineSeries of maximum, average and minimum temperature that are updated every second. I'm sure there's something simple I am missing. This article provides tips and tricks for implementing dynamic updates in your QChart using line series. log("loaded VXYModelMapper: xColumn " + mapper You are right, you once suggested. so the chart values don't remain static but instead, they are dynamic. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); 1 Reply M I have 4 charts, 3 of which have a single series, and one which has 2 series. We're now on the move to a QML application, created with Qt Design You are right, you once suggested. [explicit] QAreaSeries:: QAreaSeries (QLineSeries *upperSeries, QLineSeries *lowerSeries = nullptr) Constructs an area series I tried to update the chart series dynamically with new data recieved using OPC UA Protocol Python Code: class Thread(QThread): motor1 = Signal(int) motor2 = Signal(int) motor3 = Signa The QChart class manages the graphical representation of different types of series and other chart related objects, such as legend and axes. The Series is a Candlestick series with values Adj_Open, Adj_High, Adj_Low, Adj_Close. This can be particularly challenging when working with line series, as the chart must be updated to reflect changes in the data. VXYModelMapper{ id:mapper model: customtablemodel series: lineone xColumn: 0 yColumn: 1 Component. Coloring of the view is not a part of the QChart Qt Development; QML and Qt Quick; Data model to update chart content; QtWS: Super Early Bird Tickets Available! I don't want to be loading chart series on the Python side, just loading up data that the QML side would extract. It is significantly faster on my desktop but I have not tested it on my embedded device yet. ma5 = QtChart. The audio example from the documentation does exactly that. m_series->remove(m_axisX->min()); with. From my point of view, this is pretty much futile as it'd mean hacking at the Qt's sources. The name of the series is in seriesName, the mouse/touch position in position, and the series value in value. I am not sure thought. The example shows how to implement application with strict performance requirements using the Qt Charts QML API. This article provides tips and tricks for implementing dynamic The only way I have (so far) managed to get a Chart to refresh when adding a new point is to remove the current line series (without deleting it), append the new point to the The QXYSeries class is a base class for line, spline, and scatter series. This code creates a custom slot that updates the chart whenever the line series is updated Hello Everyone, I want to plot live data which i am reading from a sensor and want to plot it on QtChart. update (chartView. In this Qt5 C++ Tutorial i want to show you Creating LineChart with QtChart, basically we are using QtChart class for this article, QtChart module provides a set of easy to The behavior of the legend can be inspected by running the legend example. I set the model data directly by the following code. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); This graph contains 3 QLineSeries of maximum, average and minimum temperature that are updated every second. QXYSeries::pointsReplaced() You may need this somewhere - if it's working already I'd call it a win!: QT_CHARTS_USE_NAMESPACE ©2024 The Qt Company Ltd. I have a QPushButton associated to a signal wich shows the histogram with this slot: @ahsan737 I see in your code, every time that timer changes, it triggers the function chartDisp(). The data is get from the data base table. Replace. Documentation contributions included herein are the copyrights of their respective owners. setIncreasingColor(QtCore. Member Function Documentation [explicit] QAreaSeries:: QAreaSeries (QObject *parent = nullptr) Constructs an area series object without an upper or a lower series with the parent object. @JonB said in QT charts extremely slow - QLineSeries line? Aren't you supposed to do something like serie1. So looking for best option to do it. The code create series and then copies data point-by-point. I said "some LineSeries" but the end result should looks like a single line, the probl A task: Draw a graph in GUI(PyQT5) on the widget Frame(PyQt5) (this is important). append(serie) or myChart. I do have other background functions working. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); @pauledd hi, the issue seems to be that, that the QLineSeries() object becomes invalid. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version You are right, you once suggested. Acceleration using OpenGL is supported only for LineSeries and ScatterSeries. I added QApplication::processEvents(); , but it also did not help. I suspect it's because ChartView doesn't know what to do with a bunch of Item's. A line series used as an edge series for a AreaSeries cannot use OpenGL acceleration. QColor: pointBorderColor: The border color of the series. In the example we use the bar series where we add or remove the bar sets. I have not used QCharts(!), but that would sound very surprising The QAreaSeries class presents data in area charts. Here's the code I have to generate the graphs: Our first test application was created with Qt Designer, where we used a litte trick to get the QtChart to perform way better: before updating the data on a Series, we call the "blockSignals" function. Update: I have added a complete minimal example to reproduce the problem: Qt charts, series not displayed. This seems to be possible because the documentation says that "It's especially useful for visualizing depth maps and large quantities of rapidly changing data, such as data received from multiple sensors. When you add new points to a chart after it has been shown, it's not that QChartView doesn't update, it's that its current axes --- which were set up when the initial points were added before being added to the chart --- are out of range for the new point. You are confusing the index of the data points in the vector m_series and their x value. This way I can add extra series that one application might choose to show in a chart but another application might The slices can have any values as the PieSeries type calculates the percentage of a slice compared with the sum of all slices in the series to determine the actual size of the slice in the chart. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); This class draws data as a series of vertical bars grouped by category, with one bar per category from each bar set added to the series. Qml Polar Chart. void QXYSeries:: append (qreal x, qreal y) Adds the data point with the coordinates x and y to the series. What happened: @printfne My understanding is the same as I keep saying. Creating a basic line chart is simple: QLineSeries * series = new QLineSeries (); series-> append(0, 6); series-> append(2, 4); chart-> addSeries(series); I have 4 charts, 3 of which have a single series, and one which has 2 series. Here i create chart: QChart* chart= new QChart (); QLineSeries *series = new QLineSeries (); for (int i= I use the QML charts, and am dynamically updating them by doing a 'remove' followed by and 'append'. dhu0504 last edited by . QCandlestickSeries() self. I have a vertical marker which moves on mouse move event along x axis. The live-chart is updated 1 time per second. @MrShawn . Each time a data arrives, the limits of the Y axis are I am implementing Qt chart application where i have multiple Qlineseries Graphs with mutiple Y axis. axisX(chart_series) # reuse the axis from existing series myAxisY = chartView. AFAIK, the only way to implement real-time behavior is to remove the series from the chart, add the points to it, then add it back to the chart. The X axis is the time axis. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); The below code is related to qchart example "Custom chart" in qt examples. To avoid that, you must put the UI component creators (almostly all of your codes inside this function) to the outside (in your main I have a QAbtractTableModel that is accessible to a QML file with chart and series and XYModelMapper. view. I do not understand why is like this. I'm developing an app where I need to show a ChartView object with some LineSeries inside. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); It works fine for the first time but when I want to update chart it gives error: QLayout: Attempting to add QLayout "" to QWidget "chart1", which already has a layout (self) self. However, you are still appending points @ahsan737 I see in your code, every time that timer changes, it triggers the function chartDisp(). What did I miss? How can I update the QChart without flickering the display (smooth data update)? Because so far I have managed to display incoming data but the display is flickering every Learn how to dynamically update a QChart when the line series is updated in your C++ and Qt applications. Each time a data arrives, the limits of the Y axis are I am using Qt chart module in QML. It is unknown how many LineSeries will need to be added until a user selects and loads a file with the data in it. Only users with topic management privileges can see it. Appending a value to QLineSeries using the operator << or the append method should repaint the graph. Series added to QChart instances are owned by them, and are deleted when the QChart instances are deleted. I want to read them and add them on a chart with a timer at the same time. The documentation provided herein is licensed under the terms of the GNU Free Documentation License version If you append and add a series to update the chart in real time "Can not add series. Qml Oscilloscope is implemented using Qt Chart and I want to do the same but with Qt Graphs. My goal is to have a QML ChartView with a variable number of LineSeries added to it during runtime. When series is added to the chart, it is assigned a color based on the currently selected theme. AddSeries takes the ownership of the QLineSeries object. © 2024 The Qt Company So, how can i update axis after series update? Example. setDecreasingColor(QtCore. @Perdrix said in Updating a Chart when appending to a Line Series. simple fix, don't make series a member variable. Adds the data point point to the Learn how to dynamically update a QChart when the line series is updated in your C++ and Qt applications. . Thanks for suggestions! PS This post adds line series dynamically using JavaScript callback. QChart is a QGraphicsWidget that can be I have a qchart chart = new QChart(); series->append(QDateTime::currentDateTime(). [signal] void QAbstractSeries:: hover (const QString &seriesName, QPointF position, QPointF value) This signal is emitted when the series hovering changes. Returns true if the axis was detached successfully, false otherwise. There is one chart that is supposed to have areas under each line looking like that : However, I managed to make a chart with one AreaSeries, that made it look like this. py from QtDesigner We can use the signal pointAdded of the series to update the range, for this we will create 2 variables that store the maximum and minimum, respectively: #ifndef CHART_H I am trying create a python widget to plot candlestick chart with real time data in trading hours. We're now on the move to a QML application, created with Qt Design connect(m_series, &QXYSeries::pointAdded, this, &MyForm::autoScaleChart); in your form or model, better define chart and series as members, so that you can acces them from a member method called My goal is to have a QML ChartView with a variable number of LineSeries added to it during runtime. void QXYSeries:: append (const QPointF &point) This is an overloaded function. Also column number is mentioned in the VXYModelMapper. I do know how to update the existing series. Is there perhaps a more direct way, more elegant, more readable, more maintainable? When the counter hits the desired amount of new points per update the old series are removed from the chart. There will be one chart and 24 series in the chart. When trying to update the model, nothing shows up on the chart. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); I saw something very similar asked at Qt forum in QML, create LineSeries at runtime which went unanswered. Specifies whether or not the series is drawn with OpenGL. I can read the data but dont know how to plot or pass the values to QtChart. ui A task: Draw a graph in GUI(PyQT5) on the widget Frame(PyQt5) (this is important). I tried to create all of the LineSeries inside a Repeater, with no luck. I have 4 different txt files. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); 1 Reply M I'm using a QTimer() with a 20Hz update clock. QColor: pointSelectedColor: The selected color of the series. h-File: QT_CHARTS_NAMESPACE::QChart* chart; QT_CHARTS_NAMESPACE::QLineSeries* series; QT_CHARTS_NAMESPACE::QChartView* chartView; In my constructor of my mainwindow I am using Qt chart module in QML. I found similar problem on the forum - they solved it (Creating the series first, and adding it I'm melting my brain right now and cant figure out, why my chart isn't updating at all. VXYModelMapper{id:mapper model: customtablemodel series: lineone When the counter hits the desired amount of new points per update the old series are removed from the chart. D Offline. pointStart, data: newSeries[0]. A spline series stores the data points and the segment control Hello!! I am trying to use an histogram associated to a video streaming so, I want to update the chart frame by frame. update({ pointStart: newSeries[0]. This can The color of the series. " If you add series again after the removeSeries, the chart looks weird. So once you initially set the series on the chart, that's it. QMetaObject::invokeMethod(view. chart->removeSeries(scatterseries); chart->addSeries(scatterseries); The border color of the series. I define the each series at Chart creation, the populate the entire series with data from a MySQL DB then as new data is added to the DB, I do this for But his fixed the problem. This topic has been deleted. update(); Chart get update after each data which append to m_series but if I remove the below lines in the constructor: m_series->append(0,-100); m_series->append(1000,100); chart will never update?!!! Also if I put wrong values for these I would assume that using replace (properly) would only cause the chart to update when its next paint event is processed. 00); series->append(QDateTime::currentDate Hi, I use QT charts (QML-Python) for ploting, unfortunatelly I found out it is very slow (500 values takes about 4 seconds to plot!). ygwgl uipdhdh fzdrbvz hgoeu ldsvx bci gxfi xvr fxmsftx prygl