Colormap plot scatter points

[Alessi42]

Feature request - Plot a scatter plot using a colormap rather than individually creating pens for each plot point.

This may be something that I have missed in the documentation however is it possible to plot a scatter with x,y,c where c is an array of colour values to be mapped using a colormap.

Currently I am achieving this by creating an array of pens and brushes which I then use for each spot.

brushes = [pg.mkBrush(QtGui.QColor(*c)) for c in color]
pens = [pg.mkPen(color=QtGui.QColor(*c), width=width) for c in edgecolors]

spi = pg.ScatterPlotItem(
      spots=[
                      {
                          "pos": (x_data[i], y_data[i]),
                          "pen": pens[i],
                          "brush": brushes[i],
                          "size": size[i],
                      }
                      for i in range(len(x_data))
                  ],
      ...

Thanks in advance.

[pijyoi]

You may be interested in #2960, where it is demonstrated that pre- creating QBrushes is the fast way.

[j9ac9k]

Hi @Alessi42

I'm going to close out that issue, as I think the discussion pijyoi linked to is highly relevant to what you were seeking. The documentation could likely use some work to make this clearer, and a PR would be accepted to that effect. Let us know if you're still having troubles.