散景 - 如何点击和拖动？

Question

I would like to click-and-drag the scatter points the points of a bokeh scatter plot. Any ideas how to do this?

(edit: this is an example of what I'd like to do)

For an example of a scatter, the code below generates the scatter plot chart found half-way through this page .

from bokeh.plotting import figure, output_file, show

# create a Figure object
p = figure(width=300, height=300, tools="pan,reset,save")

# add a Circle renderer to this figure
p.circle([1, 2.5, 3, 2], [2, 3, 1, 1.5], radius=0.3, alpha=0.5)

# specify how to output the plot(s)
output_file("foo.html")

# display the figure
show(p)

Answer 1

Multi-gesture edit tools are only a recent addition, landing in version 0.12.14 . You can find much more information in the Edit Tools section of the User's Guide.

Specifically to be able to move points as described in the OP, use the PointDrawTool :

Here is a complete example you can run that also has a data table showing the updated coordinates of the glyphs as they are moved (you will need to activate the tool in the toolbar first, it is off by default):

from bokeh.plotting import figure, output_file, show, Column
from bokeh.models import DataTable, TableColumn, PointDrawTool, ColumnDataSource

output_file("tools_point_draw.html")

p = figure(x_range=(0, 10), y_range=(0, 10), tools=[],
           title='Point Draw Tool')
p.background_fill_color = 'lightgrey'

source = ColumnDataSource({
    'x': [1, 5, 9], 'y': [1, 5, 9], 'color': ['red', 'green', 'yellow']
})

renderer = p.scatter(x='x', y='y', source=source, color='color', size=10)
columns = [TableColumn(field="x", title="x"),
           TableColumn(field="y", title="y"),
           TableColumn(field='color', title='color')]
table = DataTable(source=source, columns=columns, editable=True, height=200)

draw_tool = PointDrawTool(renderers=[renderer], empty_value='black')
p.add_tools(draw_tool)
p.toolbar.active_tap = draw_tool

show(Column(p, table))