383 lines
10 KiB
Python
383 lines
10 KiB
Python
# piker: trading gear for hackers
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# Copyright (C) Tyler Goodlet (in stewardship for piker0)
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Affero General Public License for more details.
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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Higher level annotation editors.
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"""
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from dataclasses import dataclass, field
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from typing import Optional
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import pyqtgraph as pg
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from pyqtgraph import ViewBox, Point, QtCore, QtGui
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from pyqtgraph import functions as fn
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from PyQt5.QtCore import QPointF
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import numpy as np
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from ._style import hcolor, _font
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from ._lines import LevelLine
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from ..log import get_logger
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log = get_logger(__name__)
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@dataclass
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class ArrowEditor:
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chart: 'ChartPlotWidget' # noqa
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_arrows: field(default_factory=dict)
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def add(
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self,
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uid: str,
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x: float,
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y: float,
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color='default',
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pointing: Optional[str] = None,
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) -> pg.ArrowItem:
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"""Add an arrow graphic to view at given (x, y).
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"""
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angle = {
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'up': 90,
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'down': -90,
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None: 180, # pointing to right (as in an alert)
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}[pointing]
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# scale arrow sizing to dpi-aware font
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size = _font.font.pixelSize() * 0.8
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arrow = pg.ArrowItem(
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angle=angle,
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baseAngle=0,
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headLen=size,
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headWidth=size/2,
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tailLen=None,
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pxMode=True,
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# coloring
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pen=pg.mkPen(hcolor('papas_special')),
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brush=pg.mkBrush(hcolor(color)),
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)
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arrow.setPos(x, y)
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self._arrows[uid] = arrow
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# render to view
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self.chart.plotItem.addItem(arrow)
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return arrow
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def remove(self, arrow) -> bool:
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self.chart.plotItem.removeItem(arrow)
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@dataclass
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class LineEditor:
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'''The great editor of linez.
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'''
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chart: 'ChartPlotWidget' = None # type: ignore # noqa
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_order_lines: dict[str, LevelLine] = field(default_factory=dict)
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_active_staged_line: LevelLine = None
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def stage_line(
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self,
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line: LevelLine,
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) -> LevelLine:
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"""Stage a line at the current chart's cursor position
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and return it.
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"""
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# add a "staged" cursor-tracking line to view
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# and cash it in a a var
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if self._active_staged_line:
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self.unstage_line()
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self._active_staged_line = line
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return line
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def unstage_line(self) -> LevelLine:
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"""Inverse of ``.stage_line()``.
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"""
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# chart = self.chart._cursor.active_plot
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# # chart.setCursor(QtCore.Qt.ArrowCursor)
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cursor = self.chart.linked.cursor
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# delete "staged" cursor tracking line from view
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line = self._active_staged_line
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if line:
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cursor._trackers.remove(line)
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line.delete()
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self._active_staged_line = None
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# show the crosshair y line and label
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cursor.show_xhair()
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def submit_line(
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self,
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line: LevelLine,
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uuid: str,
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) -> LevelLine:
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staged_line = self._active_staged_line
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if not staged_line:
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raise RuntimeError("No line is currently staged!?")
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# for now, until submission reponse arrives
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line.hide_labels()
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# register for later lookup/deletion
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self._order_lines[uuid] = line
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return line
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def commit_line(self, uuid: str) -> LevelLine:
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"""Commit a "staged line" to view.
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Submits the line graphic under the cursor as a (new) permanent
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graphic in view.
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"""
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try:
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line = self._order_lines[uuid]
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except KeyError:
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log.warning(f'No line for {uuid} could be found?')
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return
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else:
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line.show_labels()
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# TODO: other flashy things to indicate the order is active
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log.debug(f'Level active for level: {line.value()}')
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return line
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def lines_under_cursor(self) -> list[LevelLine]:
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"""Get the line(s) under the cursor position.
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"""
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# Delete any hoverable under the cursor
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return self.chart.linked.cursor._hovered
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def all_lines(self) -> tuple[LevelLine]:
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return tuple(self._order_lines.values())
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def remove_line(
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self,
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line: LevelLine = None,
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uuid: str = None,
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) -> Optional[LevelLine]:
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'''Remove a line by refernce or uuid.
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If no lines or ids are provided remove all lines under the
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cursor position.
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'''
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# try to look up line from our registry
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line = self._order_lines.pop(uuid, line)
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if line:
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# if hovered remove from cursor set
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cursor = self.chart.linked.cursor
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hovered = cursor._hovered
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if line in hovered:
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hovered.remove(line)
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# make sure the xhair doesn't get left off
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# just because we never got a un-hover event
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cursor.show_xhair()
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log.debug(f'deleting {line} with oid: {uuid}')
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line.delete()
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else:
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log.warning(f'Could not find line for {line}')
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return line
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class SelectRect(QtGui.QGraphicsRectItem):
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def __init__(
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self,
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viewbox: ViewBox,
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color: str = 'dad_blue',
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) -> None:
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super().__init__(0, 0, 1, 1)
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# self.rbScaleBox = QtGui.QGraphicsRectItem(0, 0, 1, 1)
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self.vb = viewbox
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self._chart: 'ChartPlotWidget' = None # noqa
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# override selection box color
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color = QtGui.QColor(hcolor(color))
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self.setPen(fn.mkPen(color, width=1))
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color.setAlpha(66)
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self.setBrush(fn.mkBrush(color))
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self.setZValue(1e9)
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self.hide()
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self._label = None
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label = self._label = QtGui.QLabel()
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label.setTextFormat(0) # markdown
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label.setFont(_font.font)
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label.setMargin(0)
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label.setAlignment(
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QtCore.Qt.AlignLeft
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# | QtCore.Qt.AlignVCenter
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)
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# proxy is created after containing scene is initialized
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self._label_proxy = None
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self._abs_top_right = None
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# TODO: "swing %" might be handy here (data's max/min # % change)
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self._contents = [
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'change: {pchng:.2f} %',
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'range: {rng:.2f}',
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'bars: {nbars}',
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'max: {dmx}',
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'min: {dmn}',
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# 'time: {nbars}m', # TODO: compute this per bar size
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'sigma: {std:.2f}',
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]
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@property
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def chart(self) -> 'ChartPlotWidget': # noqa
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return self._chart
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@chart.setter
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def chart(self, chart: 'ChartPlotWidget') -> None: # noqa
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self._chart = chart
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chart.sigRangeChanged.connect(self.update_on_resize)
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palette = self._label.palette()
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# TODO: get bg color working
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palette.setColor(
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self._label.backgroundRole(),
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# QtGui.QColor(chart.backgroundBrush()),
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QtGui.QColor(hcolor('papas_special')),
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)
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def update_on_resize(self, vr, r):
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"""Re-position measure label on view range change.
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"""
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if self._abs_top_right:
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self._label_proxy.setPos(
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self.vb.mapFromView(self._abs_top_right)
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)
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def mouse_drag_released(
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self,
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p1: QPointF,
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p2: QPointF
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) -> None:
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"""Called on final button release for mouse drag with start and
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end positions.
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"""
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self.set_pos(p1, p2)
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def set_pos(
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self,
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p1: QPointF,
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p2: QPointF
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) -> None:
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"""Set position of selection rect and accompanying label, move
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label to match.
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"""
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if self._label_proxy is None:
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# https://doc.qt.io/qt-5/qgraphicsproxywidget.html
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self._label_proxy = self.vb.scene().addWidget(self._label)
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start_pos = self.vb.mapToView(p1)
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end_pos = self.vb.mapToView(p2)
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# map to view coords and update area
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r = QtCore.QRectF(start_pos, end_pos)
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# old way; don't need right?
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# lr = QtCore.QRectF(p1, p2)
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# r = self.vb.childGroup.mapRectFromParent(lr)
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self.setPos(r.topLeft())
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self.resetTransform()
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self.scale(r.width(), r.height())
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self.show()
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y1, y2 = start_pos.y(), end_pos.y()
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x1, x2 = start_pos.x(), end_pos.x()
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# TODO: heh, could probably use a max-min streamin algo here too
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_, xmn = min(y1, y2), min(x1, x2)
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ymx, xmx = max(y1, y2), max(x1, x2)
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pchng = (y2 - y1) / y1 * 100
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rng = abs(y1 - y2)
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ixmn, ixmx = round(xmn), round(xmx)
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nbars = ixmx - ixmn + 1
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chart = self._chart
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data = chart._flows[chart.name].shm.array[ixmn:ixmx]
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if len(data):
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std = data['close'].std()
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dmx = data['high'].max()
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dmn = data['low'].min()
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else:
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dmn = dmx = std = np.nan
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# update label info
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self._label.setText('\n'.join(self._contents).format(
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pchng=pchng, rng=rng, nbars=nbars,
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std=std, dmx=dmx, dmn=dmn,
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))
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# print(f'x2, y2: {(x2, y2)}')
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# print(f'xmn, ymn: {(xmn, ymx)}')
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label_anchor = Point(xmx + 2, ymx)
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# XXX: in the drag bottom-right -> top-left case we don't
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# want the label to overlay the box.
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# if (x2, y2) == (xmn, ymx):
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# # could do this too but needs to be added after coords transform
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# # label_anchor = Point(x2, y2 + self._label.height())
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# label_anchor = Point(xmn, ymn)
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self._abs_top_right = label_anchor
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self._label_proxy.setPos(self.vb.mapFromView(label_anchor))
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# self._label.show()
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def clear(self):
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"""Clear the selection box from view.
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"""
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self._label.hide()
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self.hide()
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