Matplotlib data cursor. Then I want to add the cursor when hovering on the graph.

Matplotlib data cursor I also want to interact with this visual representation of the data via Mouse move and click events # An example of how to interact with the plotting canvas by connecting to move and click events. Jul 31, 2020 · In this video of backtrader 's matplotlib implementation https://youtu. The pan/zoom and mouse-location tools built into the Matplotlib GUI windows are often sufficient, but you can also use the event system to build customized data exploration tools. Other arguments (which are all keyword-only) allow for basic customization of the Cursor Cross-hair cursor # This example adds a cross-hair as a data cursor. Then I want to add the cursor when hovering on the graph. widget. It brings powerful AI-assisted coding tools to your workflow—but there's one major limitation: Jupyter Notebooks. This is a bit slow, and you may notice some lag of the cross-hair movement. , "Pan: left button to pan, right button class mplcursors. For having a crosshair to the closest data point from your cursor and displaying the coordinates, you need a mouse event where you get the x/y coordinates of your mouse and then figure out what the closest data point in your graph is to set your vertical/horizontal lines + text. The only current use case is displaying the z-value of an AxesImage in the The default implementation just returns None. Is it possible to also get the value of the The default implementation converts ints and floats and arrays of ints and floats into a comma-separated string enclosed in square brackets, unless the artist has an associated colorbar, in which case scalar values are formatted using the colorbar's formatter. 6 has been released (it's long overdue). However, all of them seem to address the x,y location of the cursor. It uses Matplotlib to draw the cursor and may be a slow since this requires redrawing the figure with every mouse move. A cursor that uses blitting for speedup of the rendering Tick. Its primary purpose is to format the data displayed when the cursor hovers over a point on the plot. artist. Multicursor # Showing a cursor on multiple plots simultaneously. The task is to select all employees hired in the year 1999 and print their names and hire dates to the console. Using multiple annotations and disabling draggability via signals # By default, each Cursor will ever display one annotation at a time. There's absolutely no way of telling that the original data was in a dataframe instead of say, a list or a numpy array. GitHub Gist: instantly share code, notes, and snippets. mplcursors requires Matplotlib≥3. The toolbar is showing the position of the cursor. The only current use case is displaying the z-value of an AxesImage in the How to create and use the matplotlib Cursor widget in Python | Python Data Visualization Jie Jenn 68. Jul 23, 2025 · In this article, the Cursor Widget of Matplotlib library has been discussed. In this case, it Cross-hair cursor # This example adds a cross-hair as a data cursor. Same format as label_props argument of CheckButtons. widgets. pyplot as plt from matplotlib. 6 adds: - Better handling of date-formatted axes. Other arguments (which are all keyword-only) allow for basic customization of the Cursor The new cursor inherits from Cursor and demonstrates the creation of new widgets and their event callbacks. On hovering the cursor over data in one subplot, the values of that datapoint are shown in all Axes. So I'd like to select two points clicking in the plot and get the initial and final x,y-position (e. This approach enhances readability Feb 7, 2013 · I'm using matplotlib. Jan 22, 2024 · Can you create a fully reproducible minimal example? Such an example would clarify what exactly you understand by "marker", as matplotlib has different elements with markers. As an end-user of Matplotlib you will most likely not call this method yourself. The only current use case is displaying the z-value of an AxesImage in the status bar of a plot window, while moving the mouse. Cross-hair cursor # This example adds a cross-hair as a data cursor. Cursor. The cursor convenience function makes a collection of artists selectable. Annotate on hover # When hover is set to True, annotations are displayed when the mouse hovers over the artist, without the need for clicking. Here I show how to use HoloViews, Bokeh, and DataShader to build a class that Allows the ossible to make labels appear when hovering over a point in matplotlib in stem plot? Add cursor to matplotlib Reference 1: The new cursor inherits from Cursor and demonstrates the creation of new widgets and their event callbacks. format_cursor_data(data) ¶ Return a string representation of data. Set the text position and redraw agg buffer and mouse event. For the cursor to remain responsive you must keep a reference to it Dec 5, 2024 · Introduction Creating effective scatter plots in Python using matplotlib is a powerful way to visualize data. By default, the toolbar includes a status bar at the bottom, which typically displays basic messages (e. format_cursor_data ¶ Tick. This example generates three Axes split over two different figures. I have got it to display the value of the heatmap but it displayed information I do not want as matplotlib. misc. format_cursor_data ¶ Axes. subplots() lines = ax. com What is Cursor Widget? The Matplotlib Cursor Widget is specifically the Cursor class in Matplotlib's widgets module. format_cursor_data () in Python Matplotlib. For some reason, the Cursor doesn't show Jan 5, 2020 · matplotlib. Cursor(artists, *, multiple=False, highlight=False, hover=False, bindings=None, annotation_kwargs=None, annotation_positions=None, highlight_kwargs=None) [source] # A cursor for selecting Matplotlib artists. get_cursor_data ¶ Artist. bindings # See the bindings keyword argument to the constructor. Axis. Aug 4, 2021 · Get the cursor class instance, to update the cursor points on the plot. Specifically, its first argument can either be a list of artists or axes (in which case all artists in each of the axes become selectable); or one can just pass no argument, in which case all artists in all figures become selectable. time vs Temperature, selecting to points must return initial and final time). pyplot as plt import numpy as np from mpldatacursor import datacursor data = np. 4K subscribers Subscribed Mar 19, 2017 · I've got a PyQt4 GUI which has a matplotlib plot embedded in it. Jun 9, 2019 · I frequently acquire and analyze very long time series with millions of data points. Annotations can be made non-draggable by hooking their creation. image import AxesImage import numpy as np from numpy. The only current use case is displaying the z-value of an AxesImage in the Dec 31, 2019 · Interactive data cursors for Matplotlib Jul 20, 2017 · 0 , Hi guys, I'm using python>matplotlib and I want to get the data from the plot by using the cursor. format_cursor_data () function is a method of the Axis class in Matplotlib. I would like to be able to see the name of an object when I hover my cursor over the p Matplotlib itself does not have a specific Mouse Cursor widget but however Matplotlib library provides various mechanisms to interact with the mouse cursor by allowing developers to enhance the interactivity of plots. Display a data cursor including a text box, which shows the plot point close to the mouse pointer. Oct 3, 2024 · This article will provide an in-depth look at how to use the Matplotlib Cursor Widget effectively in your data visualization projects. The new cursor inherits from Cursor and demonstrates the creation of new widgets and their event callbacks. - Proper Multicursor # Showing a cursor on multiple plots simultaneously. get_cursor_data(event) ¶ Get the cursor data for a given event. The only current use case is displaying the z-value of an AxesImage in the Matplotlib’s FigureCanvas provides event hooks. A more effective solution is to implement hovering annotations, which display information when the cursor hovers over the respective data point. Tick. Done this way, the user's eyes do not have to move far from the graph to find the data coordinates. This is critical for tasks like image analysis, debugging computer vision models, or validating scientific data visualizations. Oct 11, 2021 · To create a custom mouse cursor in matplotlib, we can take the following steps Steps Set the figure size and adjust the padding between and around the subplots. Annotation? What is Annotated Cursor? An annotated cursor is a feature in data visualization that combines cursor tracking with additional information, annotations or tooltips displayed alongside the cursor position as it moves across the plot. It may be possible to write some JavaScript for the Jupyter notebook to obtain the color and pixel on mouse over an image in the cell output. I’d like to have an annotation appear when hovering over areas of a bar graph and disappear again when I leave that area. Matplotlib itself does not have a specific Mouse Cursor widget but however Matplotlib library provides various mechanisms to interact with the mouse cursor by allowing developers to enhance the interactivity of plots. Is it possible to also get the value of the Dec 5, 2024 · Introduction Creating effective scatter plots in Python using matplotlib is a powerful way to visualize data. A cursor that uses blitting for speedup of the rendering Nov 15, 2024 · Understanding the Matplotlib. Cursor but the cursor is only viewed widgets. I have got it to display the value of the heatmap but it displayed information I do not want as Jun 17, 2020 · matplotlib. Data tips are small text boxes that display information about individual data points. Enable or disable data cursor mode, and set other basic options, by using the datacursormode function. ) Sep 7, 2019 · I would like to display the value of a particular element of a heatmap when I hover the mouse over it. get_cursor_data(event) ¶Get the cursor data for a given event. face ())". set_title('Click somewhere on a To extend this concept to a true multi-cursor scenario where multiple cursors move independently we would need to create separate instances of the Cursor class for each line or data source and update the information accordingly. Cursor(ax, *, horizOn=True, vertOn=True, useblit=False, **lineprops) [source] # Bases: AxesWidget A crosshair cursor that spans the Axes and moves with mouse cursor. , xdata, ydata) representing cursor coordinates in plot units. However, labeling each point can overwhelm the visual space, especially when dealing with a large dataset. (Keep in mind that matplotlib predates pandas by over a decade. The hover function checks if the mouse is near any data point, updates the annotation text, and toggles Cursor data can be used by Artists to provide additional context information for a given event. The Artist class contains Abstract base class for objects that render into a FigureCanvas. Bind the function *mouse_event* to the event *button_press_event*. Note, this is an interactive example, and must be run to see the effect. g. Other arguments (which are all keyword-only) allow for basic customization of the Cursor The Matplotlib Cursor Widget is specifically the Cursor class in Matplotlib's widgets module. But I would like that the cursor snaps to the nearest data point (when close enough) or simply Mar 23, 2024 · Using Matplotlib plot () function, we can create the initial plot. text import Text from matplotlib. Jun 2, 2021 · Cursor is for having a crosshair where your cursor currently is. Jun 21, 2017 · This picture shows what I am trying to achieve: I am searching for a solution to add a cursor to my plotted line in matplotlib. Create x and y data points using numpy. This has two advantages: the code you write will be more portable, and Matplotlib events are aware of things like data coordinate space and which axes the event occurs in so you don't Sep 17, 2015 · Matplotlib converts things to arrays when you plot the data. 1. The cursor should be draggable, but should only move on the plotted l Jun 17, 2020 · Cursor Demo ¶ This example shows how to use Matplotlib to provide a data cursor. The idea is to get a data line which when moved with a mouse and shows the data point of the plotted graph. I’d like it to automatically disappear. One key feature of interactive plots is the ability to inspect coordinates via the cursor—but by default, Matplotlib’s navigation toolbar displays raw cursor coordinates, not the exact values of nearby data points. It helps users gain insights into specific data points or regions of interest by providing contextual information. Display a bar’s height and name on top of it upon hovering # Using an event handler to change the annotation text and position. The function receives event data (e. As a guess to an answer, you'll probably need two cursors. However, currently, it is only supported for the Matplotlib version 3. Here I show how to use HoloViews, Bokeh, and DataShader to build a class that Allows the ossible to make labels appear when hovering over a point in matplotlib in stem plot? Add cursor to matplotlib Reference 1: Jul 15, 2018 · In a matplotlib plot, how can I continuously read the coordinates of the mouse when it is moved, but without waiting for clicks? This is possible in matlab, and there is a mpld3 plugin to do almost Apr 10, 2025 · Calling Cursor a game changer is almost an understatement. The code I use to create my line graph is as follows: df_all['c Jun 17, 2020 · matplotlib. We show three implementations: A simple cursor implementation that redraws the figure on every mouse move. patches import Rectangle from matplotlib. I want to have a cursor that snaps to the data and shows the precise x and y value. text. My workflow requires interactive plots of the data with zoom and pan and the ability to quickly place cursors on individual datapoints to read off their precise values and to find their indices within the time series. This provides a way to interactively display the coordinates and data values of a plot as the cursor moves across it. All visible elements in a figure are subclasses of Artist. Jan 19, 2020 · Hi I’m experimenting with mplcursors for the first time. Artist. Instead of providing a host of keyword arguments in Cursor ’s constructor, mplcursors represents selections as Selection objects and lets you hook into their addition and removal. The default implementation just returns None. After that we want to use the mplcursors. Is this achievable in python? May 11, 2013 · In MATLAB, one can use datacursormode to add annotation to a graph when user mouses over. cursor class and enable hovering by setting hover=True. And … Sep 7, 2019 · I would like to display the value of a particular element of a heatmap when I hover the mouse over it. 93 May 27, 2021 · Tooltips with Python’s Matplotlib How to add tooltips to your Matplotlib charts Allowing the user to hover the mouse or click a part of our visualization to get more context is excellent. Register a callback function for motion_notify_event to track mouse movements. To control data tip appearance and behavior, return and use a DataCursorManager object. Get the x and y data points' indices. Create a new figure or activate an existing figure. Mar 27, 2016 · I have checked all the threads mentioned in the following reply: matplotlib values under cursor. We’ll cover everything from basic usage to advanced techniques, with plenty of examples along the way. Interactive figures # Interactivity can be invaluable when exploring plots. Sep 15, 2020 · The windows created by pyplot have an interactive toolbar with navigation buttons and a readout of the data values the cursor is pointing at. Plot t and s data points using plot () method. Is there such thing in matplotlib? Or I need to write my own event using matplotlib. format_cursor_data(data) ¶ Return cursor data string formatted. outer(range(10), range(1, 5)) fig, ax = plt. The data returned is formatted and printed on the console. The x/y coordinate under the cursor is displayed at the bottom left of the window. 1 Jul 25, 2016 · I have written a new "data cursors for matplotlib" package, inspired from @joferkington 's mpldatacursor but rewritten from scratch, with a much I have a plot of 3 data sets that have datetime objetcs on the x axis. 4 Querying Data Using Connector/Python The following example shows how to query data using a cursor created using the connection's cursor() method. Faster cursoring is possible using native GUI drawing, as in WXcursor Demo. finxter. One of its key features is the built-in navigation toolbar, which provides essential tools like pan, zoom, save, and home. I was reviewing the matplotlib. Jul 23, 2025 · A cross-hair cursor is a precision tool designed to enhance accuracy by marking a specific point on the screen with two intersecting perpendicular lines. Aug 16, 2015 · Hi folks, mpldatacursor version 0. random import rand if 1: fig, ax = plt. The message in the Toolbar reflects the position of the cursor and displays for example: Jan 23, 2022 · Hello, Inspired by matlab and plotly, I made pure matplotlib implementation of crosshair cursor with hovering date labels. Matplotlib data cursor. lines import Line2D from matplotlib. 0/gallery/misc/cursor_demo_s Cursor data can be used by Artists to provide additional context information for a given event. A cursor that uses blitting for speedup of the rendering Apr 13, 2017 · The %matplotlib inline backend displays the plot outputs as png images. Each point on the scatter plot is associated with a named object. ipynb files, which is a big drawback for anyone working in data science. A number of helpful keybindings are registered by default. Plot the x and y data points using plot () method. Cursor data can be used by Artists to provide additional context information for a given event. Unfortunately, Cursor doesn’t play well with . This article explains how to insert a cursor to your plot, how to customize it and how to store the values that you selected on the plot window. However, when doing so, they must ensure that format_cursor_data can convert the data to a string representation. import matplotlib. I follow the demo from https://matplotlib. The only current use case is displaying the z-value of an AxesImage in the Cursor data can be used by Artists to provide additional context information for a given event. 2. The requirement is as below image (image is from a different app): Details of the plot shown in the image is as follows: X axis is time Multiple Y axis for each data (temperature) There are 2 cursors - Cursor A and Cursor B Tooltips for each signal can be seen at Cursor A and Cursor B Time Nov 3, 2024 · Comprehensive Guide to Matplotlib. This function is an essential component of the Matplotlib library, which is widely used for creating static, animated, and interactive visualizations Jun 2, 2021 · Cursor is for having a crosshair where your cursor currently is. All you need to do is create a Cursor object using the Cursor Class from the Matplotlib widgets module. Learn how to add a powerful crosshair cursor to your Matplotlib plots for enhanced data visualization. Linked with the x-axis of the other subplots we can see the data matching of other graphs too. I want to add a Cursor widget (much like this example, which does work for me) to the plot. be/m6b4Ti4P2HA?t=2008 I can see that a default and very fast and CPU saving crosshair mouse cursor seems to exist in matplotlib. Let's explore these aspects in detail. Set the x and y positions. A Cursor spans the axes horizontally and/or vertically and moves with the mouse cursor. The only current use case is displaying the z-value of an AxesImage in the Apr 20, 2023 · Hello all, I am trying to plot and analyze the data using matplotlib library as well as plotly. mplcursors provides interactive data selection cursors for Matplotlib. Oct 25, 2020 · I have a very basic plot, for which I would like to add the ability to display values when mouse hovers over data points on the plot. 5 days ago · When working with image data in Jupyter Notebook, a common need arises: inspecting the exact coordinates (cursor location) and pixel values of specific regions in an image. Dec 22, 2014 · I'm writing a GUI package on Python with Tkinter module and using matplotlib via FigureCanvasTkAgg to show some graphical data. Jan 22, 2012 · I’ve recently been playing around with a widget intended to be similar to matlab’s “data cursor”. class mplcursors. Sep 20, 2020 · Its called data cursors in signal processing toolbox and I want to use a pre-existing or build a similar one. Type: dict Annotated cursor # Display a data cursor including a text box, which shows the plot point close to the mouse pointer. By default, Matplotlib displays the raw coordinate values, but this function allows you to customize the format of these values. pyplot as plt import numpy as np from matplotlib. - ?Popup? text boxes can be interactively hidden by right-clicking (controllable through the hide_button and display_button kwargs). cursor () function to add interactivity to the plot, in here we have created a figure and axes object, plot the data, and after that created a cursor object. Also, a matplotlib "line" could have more than 2 vertices; it is not clear if that is needed in your case. The mpldatacursor and mplcursors third-party packages can be used to achieve a similar effect. axis. Major Changes in v0. format_cursor_data ¶ YAxis. The default implementation converts ints and floats and arrays of ints and floats into a comma-separated string enclosed in square brackets, unless the artist has an associated colorbar, in which case scalar values are formatted using the colorbar's formatter. Jun 21, 2020 · I want to plot the close price of INS as below and it works. on_add function is a callback that specifies the behavior when the cursor is added to a specific data point. Example: Imagine analyzing a graph in Matplotlib and needing to pinpoint the exact intersection of a sine wave with a Mouse Cursor # This example sets an alternative cursor on a figure canvas. The core data structures in matplotlib are numpy arrays. I already have a "snap to cursor", but that Creating a Cursor in Matplotlib Setting up a Cursor widget is actually very simple, and requires just a single step. Apr 5, 2021 · We will use mpldatacursor library, which provides interactive data cursors (that are clickable annotation boxes) for Matplotlib. The only current use case is displaying the z-value of an AxesImage in the Parameters: propsdict Dictionary of Text properties to be used for the labels. ). Currently, I can only get the annotation to appear when over the bar but not disappear when no longer over it (without manual action or hover over another bar). If you pass in the correct parameters, the cursor object will automatically appear on screen. matplotlib. Type: dict annotation_kwargs # See the annotation_kwargs keyword argument to the constructor. class matplotlib. Subclasses can override the method and return arbitrary data. set_title('click on points', picker=True). We use the connect method to define a callback function that sets the text of the annotation to the coordinates of the hovered data point. imshow to get an interactive display of a 2D array. The only current use case is displaying the z-value of an AxesImage in the 3 days ago · Matplotlib, a popular Python plotting library, provides a robust set of tools for creating static and interactive plots. , "Pan: left button to pan, right button You can use data cursor mode to explore data by interactively creating and editing data tips. Matplotlib Cursor Widget：增强数据可视化交互的强大工具 参考： Matplotlib Cursor Widget Matplotlib是Python中最流行的数据可视化库之一，而Cursor Widget是Matplotlib中一个强大的交互式工具，它能够极大地增强数据可视化的交互性和用户体验。本文将深入探讨 Matplotlib Cursor Widget的使用方法、功能特性以及实际应用 May 21, 2013 · The problem is: when I add a second axis with twinx(), both Cursors report data coordinates with respect to the second axis only. format_cursor_data () Function The Matplotlib. Oct 17, 2023 · We then create a scatter plot using the scatter function from Matplotlib. Set some axis properties. It is inspired from mpldatacursor, with a much simplified API. The only current use case is displaying the z-value of an AxesImage in the matplotlib. The only current use case is displaying the z-value of an AxesImage in the 5. See also the cross hair cursor, which implements a cursor tracking the plotted data, but without using inheritance and without displaying the currently tracked coordinates. Pass multiple=True to display multiple annotations. org/3. YAxis. This code initializes a scatter plot and an annotation object. In lots of s mpldatacursor offers a few different styles of interaction through the datacursor function. Getting Event handling # Matplotlib supports event handling with a GUI neutral event model, so you can connect to Matplotlib events without knowledge of what user interface Matplotlib will ultimately be plugged in to. Feb 5, 2014 · Alternatively, if you have scipy, you could use FollowDotCursor, which will annotate the data point closest to the cursor. Next, we create an instance of the mplcursors. However, Jupyter Notebook’s default static inline images (via `%matplotlib inline`) do not Jul 12, 2025 · Matplotlib is a library in Python and it is numerical – mathematical extension for NumPy library. axes. For example, my Cursors (fern and muffy) report the y -value is 7. subplots() ax. I’m Nov 17, 2025 · Matplotlib is a powerful Python library for data visualization, widely used to create static, animated, and interactive plots. The good news? There’s a simple workaround that lets you enjoy the best of both worlds. format_cursor_data () in Python is a powerful method that plays a crucial role in customizing the display of cursor data in Matplotlib plots. A cursor that uses blitting for speedup of the rendering Feb 11, 2020 · I am using matplotlib with NavigationToolbar2QT. As an example, this displays the x, y coordinates of the selected artist in an annotation box: import matplotlib. patches import BoxStyle, … Cursor data can be used by Artists to provide additional context information for a given event. Commonly used in design, gaming, and analysis, the cross-hair cursor enables exact placement, measurement, or alignment. mpldatacursor provides interactive ?data cursors? (clickable annotation boxes) for matplotlib. Learn how to create a data cursor with a text box to display plot points using Matplotlib, a powerful Python data visualization library. 6 Version 0. To display the figure Oct 9, 2016 · Interactive data selection cursors for Matplotlib. plot(data) ax. The only current use case is displaying the z-value of an AxesImage in the Jun 9, 2019 · I frequently acquire and analyze very long time series with millions of data points. In mouse_event, get the x and y data of the current position of the mouse. However it may be much easier to just use the %matplotlib notebook backend, which keeps the matplotlib figure alive when plotting it to the output and therefore the usual built-in Feb 17, 2014 · import matplotlib. format_cursor_data(self, data) ¶ Return a string representation of data. Annotated Cursor # Display a data cursor including a text box, which shows the plot point close to the mouse pointer. The cross-hair is implemented as regular line objects that are updated on mouse move. In the view of Matplotlib or other plotting I am using matplotlib to make scatter plots. (Here is an example with two cursors) ossible to make labels appear when hovering over a point in matplotlib in stem plot? Add cursor to matplotlib Reference 1: Mar 23, 2018 · Please consider the figure produced by "im = imshow (scipy. Moreover, it can be applied to more than two artists (just add a FollowDotCursor for each line, scatter plot, bar graph, etc. Axes. format_cursor_data ¶ Axis. 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