I have a pg.GraphicsLayoutWidget with some images and some ROIs displayed . I would like to get obtain a numpy array for what is currently on the scene, just like the export command in the context menu of the viewbox . Let an arbitrary RGB image (i.e. a numpy array) image be given. For example , I am using ht…
Tag: pyqtgraph
How to plot hour:min time in ISO 8601 time format?
I am trying to plot temperature data points according to their time recording. Note: as you have mentioned t is represented without hour, the reason is that temp been collected in hour:second. t is a string representing the date and time in ISO 8601 format (ref: datetime.datetime.isoformat()) and temp is a fl…
Generating Scatter Plot from a Matrix
I have a code that generates random matrices of 0’s and 1’s, and I’d like to convert these matrices into scatter plots, where the coordinate corresponds to the matrix row/column, and the color of the scatter point corresponds to the value (red if 0, blue if 1 for example). I’ve been ab…
matplotlib.pyplot.clim counterpart in pyqtgraph
I want to apply a colormap (“hot”) only to a certain range of values of an image. I already know this functionality from matplotlib.pyplot.clim where you have to specify a minimum and a maximum value for the scaling. As I understood it, you should use setLevels([min,max]) for this. I have included…
Hover Tool for plots in Pyqtgraph
I want to have data information shown when hovering over a line in pyqtgraph plots, but can’t get my sigpointsHovered to emit any signal. Here is a simple example of what i tried to do: I have already tried setting “hoverable” = True and read the docs several times, but I honestly have no cl…
pyqtgraph: How to add radiobuttons on a figure legend?
I want to control which curves are displayed at the figure by using the radiobuttons floating on the left-top corner, which will work also as a legend. How can I do that? Answer This could be achieved by inheiring pg.LegendItem and overriding addItem method. In it you need to create widgets and place them int…
how to improve the speed of drawing a lot of TextItem in pyqtgraph
I AM try to mark some location in pyqtgraph, Here is the code. the sum of data is: 41363 the count of them, it is slow to execute it. How can I improve the speed? Answer just use ScatterPlotItem will work
How to move rect in pyqtgraph
I try to have a rect which moves with the mouse pointer. However, I seem to have a problem with calling the paint method. It either doesn’t draw or creates artifacts. The only clean picture I get is with a forced redraw (zoom the graph). Here’s my mwe Answer Just redrawing the contents of an inter…
finplot as a widget in layout
I am trying to add finplot, https://pypi.org/project/finplot/, as a widget to one of the layouts in my UI. I created a widget for finplot and added it to the widgets in the layout but I get the following error: Here is the code that I used. Answer The create_plot_widget() function creates a PlotItem that cann…
Creating a non-overlapping QVideoPlayer and PlotWidget in PyQt5
I am trying to create an app in PyQt5 that has a media (video) player, a graph, and a few buttons. Currently, whenever I try to add the video and graph widgets, they compete for space (lay on top of one another), even when using QGridLayout. Here is the entire file so far. The important parts are under ‘…