Backtrader 文档学习- Plotting -Plotting on the same axis
Backtrader 文档学习- Plotting -Plotting on the same axis
1.概述
在同一轴上绘图,绘图是在同一空间上绘制原始数据和稍微(随机)修改的数据,但不是在同一轴上。
核心代码,data数据正负50点。
# The filter which changes the close price
def close_changer(data, *args, **kwargs):
data.close[0] += 50.0 * random.randint(-1, 1)
return False # length of stream is unchanged
图示 :
可以看到:
- 图表的左右两侧有不同的刻度
- 当看到摆动的红线(随机数据)时,这一点最为明显,它在原始数据周围振荡±50个点。
在图上,视觉印象是这些随机数据大多时候都在原始数据上方,这只是由于左右不同的刻度造成的视觉差异。
尽管1.9.32.116 版本已经有了基础的支持,可以完全在同一轴上绘制,但图例标签会重复(只有标签,没有数据),容易令人困惑。
1.9.33.116 版本解决了这个问题,并允许在同一轴上完全绘制。使用模式与决定与哪些其他数据一起绘制的模式相同。看之前的代码 。
import backtrader as bt
cerebro = bt.Cerebro()
data0 = bt.feeds.MyFavouriteDataFeed(dataname='futurename')
cerebro.adddata(data0)
data1 = bt.feeds.MyFavouriteDataFeed(dataname='spotname')
data1.compensate(data0) # let the system know ops on data1 affect data0
data1.plotinfo.plotmaster = data0
data1.plotinfo.sameaxis = True
cerebro.adddata(data1)
...
cerebro.run()
data1 获得了一些plotinfo 值:
- 在与数据0相同的空间上绘制
- 获得使用相同轴sameaxis的设置
这种指示的原因是平台无法提前知道每个数据的比例是否兼容,这就是为什么它将在独立的尺度上绘制它们。
示例增加了一个选项,可以在同一轴上绘制。执行:
python ./future-spot.py --sameaxis
注意:
- 右侧只有一个刻度
- 现在随机数据似乎明显在原始数据周围振荡,预期的视觉效果。对比上图更准确。
2.Help
python ./future-spot.py --help
usage: future-spot.py [-h] [--no-comp] [--sameaxis]
Compensation example
optional arguments:
-h, --help show this help message and exit
--no-comp
--sameaxis
3.代码
#!/usr/bin/env python
# -*- coding: utf-8; py-indent-offset:4 -*-
###############################################################################
#
# Copyright (C) 2015-2023 Daniel Rodriguez
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
###############################################################################
from __future__ import (absolute_import, division, print_function,
unicode_literals)
import argparse
import random
import backtrader as bt
# The filter which changes the close price
def close_changer(data, *args, **kwargs):
data.close[0] += 50.0 * random.randint(-1, 1)
return False # length of stream is unchanged
# override the standard markers
class BuySellArrows(bt.observers.BuySell):
plotlines = dict(buy=dict(marker='$\u21E7$', markersize=12.0),
sell=dict(marker='$\u21E9$', markersize=12.0))
class St(bt.Strategy):
def __init__(self):
bt.obs.BuySell(self.data0, barplot=True) # done here for
BuySellArrows(self.data1, barplot=True) # different markers per data
def next(self):
if not self.position:
if random.randint(0, 1):
self.buy(data=self.data0)
self.entered = len(self)
else: # in the market
if (len(self) - self.entered) >= 10:
self.sell(data=self.data1)
def runstrat(args=None):
args = parse_args(args)
cerebro = bt.Cerebro()
dataname = './datas/2006-day-001.txt' # data feed
data0 = bt.feeds.BacktraderCSVData(dataname=dataname, name='data0')
cerebro.adddata(data0)
data1 = bt.feeds.BacktraderCSVData(dataname=dataname, name='data1')
data1.addfilter(close_changer)
if not args.no_comp:
data1.compensate(data0)
data1.plotinfo.plotmaster = data0
if args.sameaxis:
data1.plotinfo.sameaxis = True
cerebro.adddata(data1)
cerebro.addstrategy(St) # sample strategy
cerebro.addobserver(bt.obs.Broker) # removed below with stdstats=False
cerebro.addobserver(bt.obs.Trades) # removed below with stdstats=False
cerebro.broker.set_coc(True)
cerebro.run(stdstats=False) # execute
cerebro.plot(volume=False) # and plot
def parse_args(pargs=None):
parser = argparse.ArgumentParser(
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
description=('Compensation example'))
parser.add_argument('--no-comp', required=False, action='store_true')
parser.add_argument('--sameaxis', required=False, action='store_true')
return parser.parse_args(pargs)
if __name__ == '__main__':
runstrat()
- Commissions: Stocks vs Futures 佣金:股票与期货 ,对于策略并非BT核心 。
- Live Data Feeds and Live Trading 实时数据加载和实时交易,用不上。
偷个懒,不写了 。
算是在春节前完毕。
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新年快乐!