Never Mind. I realized that the getGradient() function on a pg.ColorMap object gave me a QLinearGradient object, so I just used that to create my own color scale in a separate widget, thus satisfying all my requirements.
On Wednesday, May 29, 2019 at 9:28:27 AM UTC-8, Israel Brewster wrote: > > When I add a legend to a graph using the plotItem.addLegend() function, I > get a nice, stationary legend that doesn't move around as I move/scale the > graph. This is great, but I need a color scale (I have a scatter plot with > colored points, and I need to show a scale bar for the colors). To this > end, I found the "GradientLegend" class, and managed to get it to show my > color map and add it to the graph using the following code: > > self._plot_widget = pg.PlotWidget() > self._plot_item = self._plot_widget.getPlotItem() > ... > gl = pg.GradientLegend((10, 500), (10, 30)) > gl.setGradient(self._color_map.getGradient()) > gl.setParentItem(self._plot_item.getViewBox()) > > This works, but I have to questions/issues with it: > > 1) Unlike the legend added with addLegend, this "legend" is not stationary > - it moves around as I move/scale the graph. Generally speaking, it moves > back to the correct location more often than not, but the effect is that it > "jiggles" around on the screen whenever I do something with the graph.And > while, as I said, it "generally" ends up back where it is supposed to, this > is not always the case - some times it winds up half off the screen, and I > have to "bump" the graph somehow to get it back on. How can I fix this so > it is truly stationary, in the same way a "formal" legend is? > > 2) Is there a way to set the size as a percentage of the window? At the > moment if the user scales their window down, it often cuts off the legend > > Assuming that at some level the GradientLegend item is/behaves like a > normal QtWidget, I could easily just add it to a layout and set it to > expanding, or at least have a minimum size constraint, so if that's > possible, I can work with that. Thanks. > -- You received this message because you are subscribed to the Google Groups "pyqtgraph" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/pyqtgraph/c8f84084-c333-4f8f-bf14-2f5db64564ae%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
