Add volume plot as default

Toss in support for a "step mode" curve (unfinished atm) and use it to
plot from the `volume` field of the ohlcv shm array (if available).

changes to make it happen,
- dynamically generate the fsp sidepane form from an input config `dict`
  |_ dynamically generate the underlying `pydantic` model
  |_
- add a "volume checker" helper func that inspects the shm array
- toss in sidepane resize calls to avoid race where the ohlcv array
  is plotted too slowly compared to the volume and the chart somehow
  doesn't show..
- drop duplicate rsi2 cruft (previously used to test plots of the shm
  data)

piker/ui/_chart.py

@@ -326,8 +326,8 @@ class LinkedSplits(QWidget):
         #     self.xaxis.hide()
 
         self.splitter = QtWidgets.QSplitter(QtCore.Qt.Vertical)
-        self.splitter.setMidLineWidth(1)
+        self.splitter.setMidLineWidth(0)
-        self.splitter.setHandleWidth(0)
+        self.splitter.setHandleWidth(2)
 
         self.layout = QtWidgets.QVBoxLayout(self)
         self.layout.setContentsMargins(0, 0, 0, 0)
@@ -341,8 +341,7 @@ class LinkedSplits(QWidget):
 
     def set_split_sizes(
         self,
-        # prop: float = 0.375,  # proportion allocated to consumer subcharts
+        prop: float = 0.375,  # proportion allocated to consumer subcharts
-        prop: float = 5/8,
 
     ) -> None:
         '''Set the proportion of space allocated for linked subcharts.
@@ -495,8 +494,9 @@ class LinkedSplits(QWidget):
         cpw.plotItem.vb.linkedsplits = self
         cpw.setFrameStyle(
             QtWidgets.QFrame.StyledPanel
-            # | QtWidgets.QFrame.Plain)
+            # | QtWidgets.QFrame.Plain
         )
+
         cpw.hideButtons()
 
         # XXX: gives us outline on backside of y-axis
@@ -515,7 +515,20 @@ class LinkedSplits(QWidget):
             cpw.draw_ohlc(name, array, array_key=array_key)
 
         elif style == 'line':
-            cpw.draw_curve(name, array, array_key=array_key)
+            cpw.draw_curve(
+                name,
+                array,
+                array_key=array_key,
+                color='default_lightest',
+            )
+
+        elif style == 'step':
+            cpw.draw_curve(
+                name,
+                array,
+                array_key=array_key,
+                step_mode=True,
+            )
 
         else:
             raise ValueError(f"Chart style {style} is currently unsupported")
@@ -523,14 +536,7 @@ class LinkedSplits(QWidget):
         if not _is_main:
             # track by name
             self.subplots[name] = cpw
-
-            # if sidepane:
-            #     # TODO: use a "panes" collection to manage this?
-            #     qframe.setMaximumWidth(self.chart.sidepane.width())
-            #     qframe.setMinimumWidth(self.chart.sidepane.width())
-
             self.splitter.addWidget(qframe)
-
             # scale split regions
             self.set_split_sizes()
 
@@ -600,7 +606,7 @@ class ChartPlotWidget(pg.PlotWidget):
             # parent=None,
             # plotItem=None,
             # antialias=True,
-            useOpenGL=True,
+            # useOpenGL=True,
             **kwargs
         )
         self.name = name
@@ -784,7 +790,7 @@ class ChartPlotWidget(pg.PlotWidget):
 
         array_key: Optional[str] = None,
         overlay: bool = False,
-        color: str = 'default_light',
+        color: Optional[str] = None,
         add_label: bool = True,
 
         **pdi_kwargs,
@@ -794,6 +800,8 @@ class ChartPlotWidget(pg.PlotWidget):
         the input array ``data``.
 
         """
+        color = color or self.pen_color or 'default_light'
+
         _pdi_defaults = {
             'pen': pg.mkPen(hcolor(color)),
         }
@@ -944,13 +952,13 @@ class ChartPlotWidget(pg.PlotWidget):
         yrange: Optional[tuple[float, float]] = None,
         range_margin: float = 0.06,
     ) -> None:
-        """Set the viewable y-range based on embedded data.
+        '''Set the viewable y-range based on embedded data.
 
         This adds auto-scaling like zoom on the scroll wheel such
         that data always fits nicely inside the current view of the
         data set.
 
-        """
+        '''
         set_range = True
 
         if self._static_yrange == 'axis':
@@ -1003,15 +1011,17 @@ class ChartPlotWidget(pg.PlotWidget):
             a = self._arrays['ohlc']
             ifirst = a[0]['index']
             bars = a[lbar - ifirst:rbar - ifirst + 1]
+
             if not len(bars):
                 # likely no data loaded yet or extreme scrolling?
                 log.error(f"WTF bars_range = {lbar}:{rbar}")
                 return
 
             if self.data_key != self.linked.symbol.key:
-                bars = a[self.data_key]
+                bars = bars[self.data_key]
                 ylow = np.nanmin(bars)
-                yhigh = np.nanmax((bars))
+                yhigh = np.nanmax(bars)
+                # print(f'{(ylow, yhigh)}')
             else:
                 # just the std ohlc bars
                 ylow = np.nanmin(bars['low'])
@@ -1072,7 +1082,6 @@ class ChartPlotWidget(pg.PlotWidget):
         # TODO: this should go onto some sort of
         # data-view strimg thinger..right?
         ohlc = self._shm.array
-        # ohlc = chart._shm.array
 
         # XXX: not sure why the time is so off here
         # looks like we're gonna have to do some fixing..

piker/ui/_display.py

@@ -20,11 +20,10 @@ Real-time display tasks for charting / graphics.
 '''
 from contextlib import asynccontextmanager
 import time
-from typing import Any
 from types import ModuleType
 
 import numpy as np
-from pydantic import BaseModel
+from pydantic import create_model
 import tractor
 import trio
 
@@ -345,45 +344,51 @@ async def fan_out_spawn_fsp_daemons(
     # blocks here until all fsp actors complete
 
 
-class FspConfig(BaseModel):
-    class Config:
-        validate_assignment = True
-
-    name: str
-    period: int
-
-
 @asynccontextmanager
 async def open_sidepane(
 
     linked: LinkedSplits,
-    display_name: str,
+    conf: dict[str, dict[str, str]],
 
-) -> FspConfig:
+) -> FieldsForm:
+
+    schema = {}
+
+    assert len(conf) == 1  # for now
+
+    # add (single) selection widget
+    for display_name, config in conf.items():
+        schema[display_name] = {
+                'label': '**fsp**:',
+                'type': 'select',
+                'default_value': [display_name],
+            }
+
+        # add parameters for selection "options"
+        defaults = config.get('params', {})
+        for name, default in defaults.items():
+
+            # add to ORM schema
+            schema.update({
+                name: {
+                    'label': f'**{name}**:',
+                    'type': 'edit',
+                    'default_value': default,
+                },
+            })
 
     sidepane: FieldsForm = mk_form(
         parent=linked.godwidget,
-        fields_schema={
+        fields_schema=schema,
-            'name': {
+    )
-                'label': '**fsp**:',
-                'type': 'select',
-                'default_value': [
-                    f'{display_name}'
-                ],
-            },
 
-            # TODO: generate this from input map
+    # https://pydantic-docs.helpmanual.io/usage/models/#dynamic-model-creation
-            'period': {
+    FspConfig = create_model(
-                'label': '**period**:',
+        'FspConfig',
-                'type': 'edit',
-                'default_value': 14,
-            },
-        },
-    )
-    sidepane.model = FspConfig(
         name=display_name,
-        period=14,
+        **defaults,
     )
+    sidepane.model = FspConfig()
 
     # just a logger for now until we get fsp configs up and running.
     async def settings_change(key: str, value: str) -> bool:
@@ -410,7 +415,7 @@ async def run_fsp(
     src_shm: ShmArray,
     fsp_func_name: str,
     display_name: str,
-    conf: dict[str, Any],
+    conf: dict[str, dict],
     group_status_key: str,
     loglevel: str,
 
@@ -444,7 +449,7 @@ async def run_fsp(
 
         open_sidepane(
             linkedsplits,
-            display_name,
+            {display_name: conf},
         ) as sidepane,
     ):
 
@@ -457,9 +462,10 @@ async def run_fsp(
         if conf.get('overlay'):
             chart = linkedsplits.chart
             chart.draw_curve(
-                name='vwap',
+                name=display_name,
                 data=shm.array,
                 overlay=True,
+                color='default_light',
             )
             last_val_sticky = None
 
@@ -662,22 +668,23 @@ async def maybe_open_vlm_display(
 
 ) -> ChartPlotWidget:
 
-    # make sure that the instrument supports volume history
-    # (sometimes this is not the case for some commodities and
-    # derivatives)
-    # volm = ohlcv.array['volume']
-    # if (
-    #     np.all(np.isin(volm, -1)) or
-    #     np.all(np.isnan(volm))
-    # ):
     if not has_vlm(ohlcv):
         log.warning(f"{linked.symbol.key} does not seem to have volume info")
     else:
-        async with open_sidepane(linked, 'volume') as sidepane:
+        async with open_sidepane(
+            linked, {
+                'volume': {
+                    'params': {
+                        'price_func': 'ohl3'
+                    }
+                }
+            },
+        ) as sidepane:
+
             # built-in $vlm
             shm = ohlcv
             chart = linked.add_plot(
-                name='vlm',
+                name='volume',
                 array=shm.array,
 
                 array_key='volume',
@@ -685,10 +692,10 @@ async def maybe_open_vlm_display(
 
                 # curve by default
                 ohlc=False,
+                style='step',
 
-                # vertical bars
+                # vertical bars, we do this internally ourselves
                 # stepMode=True,
-                # static_yrange=(0, 100),
             )
 
             # XXX: ONLY for sub-chart fsps, overlays have their
@@ -707,9 +714,23 @@ async def maybe_open_vlm_display(
 
             last_val_sticky.update_from_data(-1, value)
 
+            chart.update_curve_from_array(
+                'volume',
+                shm.array,
+            )
+
             # size view to data once at outset
             chart._set_yrange()
 
+            # size pain to parent chart
+            # TODO: this appears to nearly fix a bug where the vlm sidepane
+            # could be sized correctly nearly immediately (since the
+            # order pane is already sized), right now it doesn't seem to
+            # fully align until the VWAP fsp-actor comes up...
+            await trio.sleep(0)
+            chart.linked.resize_sidepanes()
+            await trio.sleep(0)
+
             yield chart
 
 
@@ -809,20 +830,11 @@ async def display_symbol_data(
         fsp_conf = {
             'rsi': {
                 'fsp_func_name': 'rsi',
-                'period': 14,
+                'params': {'period': 14},
                 'chart_kwargs': {
                     'static_yrange': (0, 100),
                 },
             },
-            # # test for duplicate fsps on same chart
-            # 'rsi2': {
-            #     'fsp_func_name': 'rsi',
-            #     'period': 14,
-            #     'chart_kwargs': {
-            #         'static_yrange': (0, 100),
-            #     },
-            # },
-
         }
 
         if has_vlm(ohlcv):
@@ -835,8 +847,14 @@ async def display_symbol_data(
                 },
             })
 
-        async with (
+        # NOTE: we must immediately tell Qt to show the OHLC chart
+        # to avoid a race where the subplots get added/shown to
+        # the linked set *before* the main price chart!
+        linkedsplits.show()
+        linkedsplits.focus()
+        await trio.sleep(0)
 
+        async with (
             trio.open_nursery() as ln,
         ):
             # load initial fsp chain (otherwise known as "indicators")
@@ -868,10 +886,7 @@ async def display_symbol_data(
             )
 
             async with (
-                # XXX: this slipped in during a commits refacotr,
+                maybe_open_vlm_display(linkedsplits, ohlcv),
-                # it's actually landing proper in #231
-                # maybe_open_vlm_display(linkedsplits, ohlcv),
-
                 open_order_mode(
                     feed,
                     chart,