Bokeh plotter (#714)

* Created the bokeh/file_viewer tool
Also includes
- ctapipe.utils.rgbtohex
- ctapipe.visualization.bokeh
- ctapipe.plotting.bokeh_event_viewer

* Fixed formatting

* Moved run to inside function (fixes tests)

* Replaced the rgbtohex C extension with @dneise's Python solution

* Corrected references to the old num_samples Field in inst

* Further corrections to n_chan

* Improvements to setting view as suggested by @dneise

* Improved method to execute file_viewer

Used bokeh.server.server.Server to run file_viewer through `python`
instead of `bokeh serve`
Created entry_point ctapipe-event-viewer
Rearranged directory structure of tools/bokeh

* Fixed selection of extractor

* Fixed selection of pixels to work with bokeh > 1.0
Added bokeh>1.1 as a dependency to ensure compatibility

* Changed pixel shape from rectangular to circular to better display all cameras

* Corrected tests to use example_event

* Corrected bokeh version

ctapipe/plotting/tests/test_bokeh_event_viewer.py

@@ -0,0 +1,165 @@
+from ctapipe.plotting.bokeh_event_viewer import BokehEventViewer
+from ctapipe.calib.camera.calibrator import CameraCalibrator
+import pytest
+
+
+def test_bokeh_event_viewer_creation():
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+
+
+def test_event_setting(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+    for cam in viewer.cameras:
+        assert cam.event == example_event
+    for wf in viewer.waveforms:
+        assert wf.event == example_event
+
+
+def test_enable_automatic_index_increment():
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.enable_automatic_index_increment()
+    for cam in viewer.cameras:
+        assert cam.automatic_index_increment
+
+
+def test_change_time(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    t = 5
+    viewer.change_time(t)
+    for cam in viewer.cameras:
+        assert cam.time == t
+    for wf in viewer.waveforms:
+        assert wf.active_time == t
+
+    t = -11
+    viewer.change_time(t)
+    for cam in viewer.cameras:
+        assert cam.time == 0
+    for wf in viewer.waveforms:
+        assert wf.active_time == 0
+
+    tel = list(example_event.r0.tels_with_data)[0]
+    n_samples = example_event.r0.tel[tel].waveform.shape[-1]
+    t = 10000
+    viewer.change_time(t)
+    for cam in viewer.cameras:
+        assert cam.time == n_samples - 1
+    for wf in viewer.waveforms:
+        assert wf.active_time == n_samples - 1
+
+
+def test_on_waveform_click(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    t = 5
+    viewer.waveforms[0]._on_waveform_click(t)
+    for cam in viewer.cameras:
+        assert cam.time == t
+    for wf in viewer.waveforms:
+        assert wf.active_time == t
+
+
+def test_telid(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    tels = list(example_event.r0.tels_with_data)
+
+    assert viewer.telid == tels[0]
+    for cam in viewer.cameras:
+        assert cam.telid == tels[0]
+    for wf in viewer.waveforms:
+        assert wf.telid == tels[0]
+
+    viewer.telid = tels[1]
+    assert viewer.telid == tels[1]
+    for cam in viewer.cameras:
+        assert cam.telid == tels[1]
+    for wf in viewer.waveforms:
+        assert wf.telid == tels[1]
+
+
+def test_telid_incorrect(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    with pytest.raises(KeyError):
+        viewer.telid = 148937242
+
+
+def test_on_pixel_click(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    p1 = 5
+    viewer.cameras[0]._on_pixel_click(p1)
+    assert viewer.waveforms[viewer.cameras[0].active_index].pixel == p1
+
+
+def test_channel(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    assert viewer.channel == 0
+    for cam in viewer.cameras:
+        assert cam.channel == 0
+    for wf in viewer.waveforms:
+        assert wf.channel == 0
+
+
+def test_channel_incorrect(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    with pytest.raises(IndexError):
+        viewer.channel = 148937242
+
+
+def test_view_camera(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    c = CameraCalibrator()
+    c.calibrate(example_event)
+
+    t = list(example_event.r0.tels_with_data)[0]
+
+    cam = viewer.cameras[0]
+    cam.view = 'r1'
+    assert (cam.image == example_event.r1.tel[t].waveform[0, :, 0]).all()
+
+    with pytest.raises(ValueError):
+        cam.view = 'q'
+
+
+def test_view_wf(example_event):
+    viewer = BokehEventViewer(config=None, tool=None)
+    viewer.create()
+    viewer.event = example_event
+
+    c = CameraCalibrator()
+    c.calibrate(example_event)
+
+    t = list(example_event.r0.tels_with_data)[0]
+
+    wf = viewer.waveforms[0]
+    wf.view = 'r1'
+    assert (wf.waveform == example_event.r1.tel[t].waveform[0, 0, :]).all()
+
+    with pytest.raises(ValueError):
+        wf.view = 'q'