- Significant refactoring resulting in a 34% reduction in size of the codebase (excluding the Lightweight Charts package) and greater efficiency.
- Upgraded to Lightweight Charts v4.0.1. - Added a ‘hover’ item to the returning dictionary from subscribe_click. - Markers and SubCharts no longer use a UUID for identification, but an 8 character string.
This commit is contained in:
louisnw
@ -1,69 +1,66 @@
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import pandas as pd
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import webview
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import multiprocessing as mp
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from uuid import UUID
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from datetime import datetime
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from typing import Union, Literal
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from lightweight_charts.pywebview import _loop
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from lightweight_charts.util import LINE_TYPE, POSITION, SHAPE, CROSSHAIR_MODE, PRICE_SCALE_MODE
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from lightweight_charts.js import LWC
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class Line:
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def __init__(self, chart, line_id):
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self._chart = chart
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self.id = line_id
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def set(self, data: pd.DataFrame):
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"""
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Sets the line data.\n
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:param data: columns: date/time, price
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"""
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self._chart._go('_set_line_data', self.id, data)
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def update(self, series: pd.Series):
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"""
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Updates the line data.\n
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:param series: labels: date/time, price
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"""
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self._chart._go('_update_line_data', self.id, series)
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class Chart:
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def __init__(self, volume_enabled: bool = True, width: int = 800, height: int = 600, x: int = None, y: int = None,
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on_top: bool = False, debug: bool = False, sub: bool = False,
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inner_width: float = 1.0, inner_height: float = 1.0):
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class PyWV:
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def __init__(self, q, exit, loaded, html, js_api, width, height, x, y, on_top, debug):
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self.queue = q
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self.exit = exit
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self.loaded = loaded
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self.debug = debug
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self.volume_enabled = volume_enabled
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self.width = width
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self.height = height
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self.x = x
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self.y = y
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self.on_top = on_top
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self.inner_width = inner_width
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self.inner_height = inner_height
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self.js_api = js_api
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self.webview = webview.create_window('', html=html, on_top=on_top, js_api=js_api,
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width=width, height=height, x=x, y=y)
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self.webview.events.loaded += self.on_js_load
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self.loop()
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if sub:
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return
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def loop(self):
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while 1:
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arg = self.queue.get()
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if arg in ('start', 'show', 'hide', 'exit'):
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webview.start(debug=self.debug) if arg == 'start' else getattr(self.webview, arg)()
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self.exit.set() if arg in ('start', 'exit') else None
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elif arg == 'subscribe':
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func, c_id = (self.queue.get() for _ in range(2))
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self.js_api.click_funcs[str(c_id)] = func
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else:
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try:
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self.webview.evaluate_js(arg)
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except KeyError:
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return
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def on_js_load(self):
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self.loaded.set(), self.loop()
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class Chart(LWC):
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def __init__(self, volume_enabled: bool = True, width: int = 800, height: int = 600, x: int = None, y: int = None,
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on_top: bool = False, debug: bool = False,
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inner_width: float = 1.0, inner_height: float = 1.0):
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super().__init__(volume_enabled, inner_width, inner_height)
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self._js_api_code = 'pywebview.api.onClick'
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self._q = mp.Queue()
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self._result_q = mp.Queue()
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self._script_func = self._q.put
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self._exit = mp.Event()
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self._process = mp.Process(target=_loop, args=(self,), daemon=True)
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self._loaded = mp.Event()
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self._process = mp.Process(target=PyWV, args=(self._q, self._exit, self._loaded, self._html, self._js_api,
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width, height, x, y, on_top, debug,), daemon=True)
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self._process.start()
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self.id = self._result_q.get()
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def _go(self, func, *args): self._q.put((func, args))
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def _go_return(self, func, *args):
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self._q.put((func, args))
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return self._result_q.get()
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self._create_chart()
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def show(self, block: bool = False):
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"""
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Shows the chart window.\n
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:param block: blocks execution until the chart is closed.
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"""
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self._go('show')
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if not self.loaded:
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self._q.put('start')
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self._loaded.wait()
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self._on_js_load()
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else:
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self._q.put('show')
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if block:
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try:
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self._exit.wait()
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@ -75,190 +72,20 @@ class Chart:
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"""
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Hides the chart window.\n
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"""
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self._go('hide')
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self._q.put('hide')
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def exit(self):
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"""
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Exits and destroys the chart window.\n
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"""
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self._go('exit')
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self._q.put('exit')
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self._exit.wait()
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self._process.terminate()
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del self
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def run_script(self, script: str):
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"""
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For advanced users; evaluates JavaScript within the Webview.
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"""
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self._go('run_script', script)
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def set(self, data: pd.DataFrame):
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"""
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Sets the initial data for the chart.\n
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:param data: columns: date/time, open, high, low, close, volume (if volume enabled).
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"""
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self._go('set', data)
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def update(self, series: pd.Series):
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"""
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Updates the data from a bar;
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if series['time'] is the same time as the last bar, the last bar will be overwritten.\n
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:param series: columns: date/time, open, high, low, close, volume (if volume enabled).
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"""
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self._go('update', series)
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def update_from_tick(self, series: pd.Series):
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"""
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Updates the data from a tick.\n
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:param series: columns: date/time, price, volume (if volume enabled).
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"""
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self._go('update_from_tick', series)
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def create_line(self, color: str = 'rgba(214, 237, 255, 0.6)', width: int = 2):
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"""
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Creates and returns a Line object.)\n
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:return a Line object used to set/update the line.
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"""
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line_id = self._go_return('create_line', color, width)
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return Line(self, line_id)
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def marker(self, time: datetime = None, position: POSITION = 'below', shape: SHAPE = 'arrow_up',
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color='#2196F3', text='') -> UUID:
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"""
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Creates a new marker.\n
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:param time: The time that the marker will be placed at. If no time is given, it will be placed at the last bar.
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:param position: The position of the marker.
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:param color: The color of the marker (rgb, rgba or hex).
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:param shape: The shape of the marker.
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:param text: The text to be placed with the marker.
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:return: The UUID of the marker placed.
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"""
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return self._go_return('marker', time, position, shape, color, text)
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def remove_marker(self, marker_id: UUID):
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"""
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Removes the marker with the given uuid.\n
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:param marker_id:
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"""
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self._go('remove_marker', marker_id)
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def horizontal_line(self, price: Union[float, int], color: str = 'rgb(122, 146, 202)', width: int = 1,
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style: LINE_TYPE = 'solid', text: str = '', axis_label_visible: bool = True):
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"""
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Creates a horizontal line at the given price.\n
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"""
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self._go('horizontal_line', price, color, width, style, text, axis_label_visible)
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def remove_horizontal_line(self, price: Union[float, int]):
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"""
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Removes a horizontal line at the given price.
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"""
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self._go('remove_horizontal_line', price)
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def config(self, mode: PRICE_SCALE_MODE = None, title: str = None, right_padding: float = None):
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"""
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:param mode: Chart price scale mode.
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:param title: Last price label text.
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:param right_padding: How many bars of empty space to the right of the last bar.
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"""
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self._go('config', mode, title, right_padding)
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def time_scale(self, visible: bool = True, time_visible: bool = True, seconds_visible: bool = False):
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"""
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Options for the time scale of the chart.
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:param visible: Time scale visibility control.
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:param time_visible: Time visibility control.
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:param seconds_visible: Seconds visibility control
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:return:
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"""
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self._go('time_scale', visible, time_visible, seconds_visible)
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def layout(self, background_color: str = None, text_color: str = None, font_size: int = None,
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font_family: str = None):
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"""
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Global layout options for the chart.
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"""
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self._go('layout', background_color, text_color, font_size, font_family)
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def grid(self, vert_enabled: bool = True, horz_enabled: bool = True, color: str = 'rgba(29, 30, 38, 5)', style: LINE_TYPE = 'solid'):
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"""
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Grid styling for the chart.
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"""
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self._go('grid', vert_enabled, horz_enabled, color, style)
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def candle_style(self, up_color: str = 'rgba(39, 157, 130, 100)', down_color: str = 'rgba(200, 97, 100, 100)',
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wick_enabled: bool = True, border_enabled: bool = True, border_up_color: str = '',
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border_down_color: str = '', wick_up_color: str = '', wick_down_color: str = ''):
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"""
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Candle styling for each of its parts.
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"""
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self._go('candle_style', up_color, down_color, wick_enabled, border_enabled,
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border_up_color, border_down_color, wick_up_color, wick_down_color)
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def volume_config(self, scale_margin_top: float = 0.8, scale_margin_bottom: float = 0.0,
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up_color='rgba(83,141,131,0.8)', down_color='rgba(200,127,130,0.8)'):
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"""
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Configure volume settings.\n
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Numbers for scaling must be greater than 0 and less than 1.\n
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Volume colors must be applied prior to setting/updating the bars.\n
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:param scale_margin_top: Scale the top of the margin.
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:param scale_margin_bottom: Scale the bottom of the margin.
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:param up_color: Volume color for upward direction (rgb, rgba or hex)
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:param down_color: Volume color for downward direction (rgb, rgba or hex)
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"""
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self._go('volume_config', scale_margin_top, scale_margin_bottom, up_color, down_color)
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def crosshair(self, mode: CROSSHAIR_MODE = 'normal', vert_width: int = 1, vert_color: str = None,
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vert_style: LINE_TYPE = None, vert_label_background_color: str = None, horz_width: int = 1,
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horz_color: str = None, horz_style: LINE_TYPE = None, horz_label_background_color: str = None):
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"""
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Crosshair formatting for its vertical and horizontal axes.
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"""
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self._go('crosshair', mode, vert_width, vert_color, vert_style, vert_label_background_color,
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horz_width, horz_color, horz_style, horz_label_background_color)
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def watermark(self, text: str, font_size: int = 44, color: str = 'rgba(180, 180, 200, 0.5)'):
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"""
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Adds a watermark to the chart.
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"""
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self._go('watermark', text, font_size, color)
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def legend(self, visible: bool = False, ohlc: bool = True, percent: bool = True, color: str = None,
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font_size: int = None, font_family: str = None):
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"""
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Configures the legend of the chart.
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"""
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self._go('legend', visible, ohlc, percent, color, font_size, font_family)
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def subscribe_click(self, function: object):
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"""
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Subscribes the given function to a chart 'click' event.
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The event returns a dictionary containing the bar object at the time clicked.
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"""
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self._go('subscribe_click', function)
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self._q.put('subscribe')
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self._q.put(function)
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self._q.put(self.id)
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super().subscribe_click(function)
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def create_subchart(self, volume_enabled: bool = True, position: Literal['left', 'right', 'top', 'bottom'] = 'left',
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width: float = 0.5, height: float = 0.5, sync: Union[bool, UUID] = False):
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c_id = self._go_return('create_subchart', volume_enabled, position, width, height, sync)
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return SubChart(self, c_id)
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class SubChart(Chart):
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def __init__(self, parent, c_id):
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self._parent = parent._parent if isinstance(parent, SubChart) else parent
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super().__init__(sub=True)
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self.id = c_id
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self._q = self._parent._q
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self._result_q = self._parent._result_q
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def _go(self, func, *args):
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func = 'SUB'+func
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args = (self.id,) + args
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super()._go(func, *args)
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def _go_return(self, func, *args):
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func = 'SUB' + func
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args = (self.id,) + args
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return super()._go_return(func, *args)
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