Simplified logic for drawing strings on a strategy chart, allowing direct calls to function packs
Functionality equivalent to JS
Ported to the JS edition drawing line library
# Python 2/3 兼容版本
import time
chart = None
series = []
labelIdx = {}
preBarTime = 0
preFlagTime = 0
preDotTime = {}
cfg = {
"tooltip" : {
"xDateFormat" : "%Y-%m-%d %H:%M:%S, %A"
},
"legend" : {
"enabled" : True
},
"plotOptions" : {
"candlestick" : {
"color" : "#d75442",
"upColor" : "#6ba583"
}
},
"rangeSelector" : {
"buttons" : [{
"type" : "hour",
"count" : 1,
"text" : "1h",
}, {
"type" : 'hour',
"count" : 3,
"text" : "3h"
}, {
"type" : "hour",
"count" : 8,
"text" : "8h"
}, {
"type" : "all",
"text" : "All"
}],
"selected" : 2,
"inputEnabled" : True
},
"series" : series,
}
def GetCfg():
global cfg
return cfg
# 画水平线
def PlotHLine(value = None, label = None, color = None, style = None):
global cfg, chart
if ("yAxis" in cfg) == False :
cfg.setdefault("yAxis", {"plotLines" : []})
elif ("plotLines" in cfg["yAxis"]) == False :
cfg["yAxis"].setdefault("plotLines", [])
obj = {
"value" : value,
"color" : color or "red",
"width" : 2,
"dashStyle" : style or "Solid",
"label" : {
"text" : label or "",
"align" : "center"
}
}
found = False
for i in range(len(cfg["yAxis"]["plotLines"])) :
if cfg["yAxis"]["plotLines"][i]["label"]["text"] == label :
cfg["yAxis"]["plotLines"][i] = obj
found = True
if not found :
cfg["yAxis"]["plotLines"].append(obj)
if not chart :
chart = Chart(cfg)
chart.update(cfg) # 更新图表
else :
chart.update(cfg)
# 画K线
def PlotRecords(records, title = None):
global labelIdx, series, preBarTime, chart
if not chart :
chart = Chart(cfg)
chart.reset()
if ("candlestick" in labelIdx) == False :
cfg["__isStock"] = True
seriesIdx = len(series)
series.append({
"type" : "candlestick",
"name" : "" if title == None else title,
"id" : "primary",
"data" : []
})
chart.update(cfg)
labelIdx.setdefault("candlestick", seriesIdx)
else :
seriesIdx = labelIdx["candlestick"]
if isinstance(records, dict) and ("Time" in records) == True :
Bar = records
if Bar["Time"] == preBarTime :
chart.add(seriesIdx, [Bar["Time"], Bar["Open"], Bar["High"], Bar["Low"], Bar["Close"]], -1)
elif Bar["Time"] > preBarTime :
preBarTime = Bar.Time
chart.add(seriesIdx, [Bar["Time"], Bar["Open"], Bar["High"], Bar["Low"], Bar["Close"]])
else :
for i in range(len(records)) :
if records[i]["Time"] == preBarTime :
chart.add(seriesIdx, [records[i]["Time"], records[i]["Open"], records[i]["High"], records[i]["Low"], records[i]["Close"]], -1)
elif records[i]["Time"] > preBarTime :
preBarTime = records[i]["Time"]
chart.add(seriesIdx, [records[i]["Time"], records[i]["Open"], records[i]["High"], records[i]["Low"], records[i]["Close"]])
return chart
# 画指标线
def PlotLine(label, dot, Ntime = None):
global labelIdx, chart, series, preDotTime
if not chart :
cfg.setdefault("xAxis", {
"type" : "datetime"
})
chart = Chart(cfg)
chart.reset()
if (label in labelIdx) == False :
seriesIdx = len(series)
preDotTime.setdefault(str(seriesIdx), 0)
labelIdx[label] = seriesIdx
series.append({
"type" : "line",
"yAxis" : 0,
"showInLegend" : True,
"name" : label,
"data" : [],
"tooltip" : {"valueDecimals" : 5}
})
chart.update(cfg)
else :
seriesIdx = labelIdx[label]
if Ntime == None :
Ntime = _N(time.time() * 1000, 0)
if preDotTime[str(seriesIdx)] != Ntime :
preDotTime[str(seriesIdx)] = Ntime
chart.add(seriesIdx, [Ntime, dot])
else :
chart.add(seriesIdx, [Ntime, dot], -1)
return chart
# 画标记
def PlotFlag(time, text, title, shape = "", color = ""):
global chart, cfg, labelIdx, preFlagTime
if not chart :
chart = Chart(cfg)
chart.reset()
label = "flag"
if (label in labelIdx) == False :
seriesIdx = len(series)
labelIdx[label] = seriesIdx
series.append({
"type" : "flags",
"onSeries" : "primary",
"data" : []
})
chart.update(cfg)
else :
seriesIdx = labelIdx[label]
obj = {
"x" : time,
"color" : color,
"shape" : shape,
"title" : title,
"text" : text
}
if preFlagTime != time :
preFlagTime = time
chart.add(seriesIdx, obj)
else :
chart.add(seriesIdx, obj, -1)
return chart
# 设置图表标题
def PlotTitle(title, chartTitle = None):
global cfg
if ("subtitle" in cfg) == True :
cfg["subtitle"] = {"text" : title}
else :
cfg.setdefault("subtitle", {"text" : title})
if chartTitle != None :
if (title in cfg) == True :
cfg["title"] = {"text" : chartTitle}
else :
cfg.setdefault("title", {"text" : chartTitle})
if chart :
chart.update(cfg)
# 导出函数
ext.GetCfg = GetCfg
ext.PlotHLine = PlotHLine
ext.PlotRecords = PlotRecords
ext.PlotLine = PlotLine
ext.PlotFlag = PlotFlag
ext.PlotTitle = PlotTitle
# 测试代码
def main():
isFirst = True
while True:
records = exchange.GetRecords()
if records and len(records) > 0 :
ext.PlotRecords(records, "BTC")
if isFirst :
ext.PlotFlag(records[-1]["Time"], "Start", "S")
isFirst = False
ext.PlotHLine(records[-1]["Close"], "Close")
ticker = exchange.GetTicker()
if ticker :
ext.PlotLine("Last", ticker.Last)
ext.PlotLine("buy", ticker.Buy + 10)
ext.PlotTitle("Last" + str(ticker.Last))
Sleep(60000)
churchillxyHi, I'm using PlotFlag, and after refreshing the page, I often lose my drawn flag. Is there a solution to this?
churchillxyCan you group several k-lines into a graph? For example: k-line of btc + k-line of ETH
m0606It looks like a two-thirds Python-compatible drawing line library.
lwc87Teacher, is there any way to use this template function, the parameters in it won't work?
haorenCan you find a customized trend chart? Gather several k-lines into one icon; for example: btc price line + ltc price line + eth price line + multi-currency aggregate price line etc.
LogaThank you!
The Little DreamWell, some parameters can't be transmitted incorrectly.
churchillxyThe problem has been solved, the number of titles is limited, the text can be rich, it cannot be reversed, thank you.
The Little DreamThe mark that has been drawn, which is supposed not to be lost, has been drawn and if you do not change it, it will not change, it is fixed.
The Little DreamIn the diagram above, you mark this is just on the FMZ page, the amount of data that is displayed on each partition page, if a chart has 100,000 data, you set it here to display 10,000 data on each partition page, and the 100,000 data will be displayed separately on 10 pages. This setting has nothing to do with your code design.
churchillxyWhat's the data cap per page here? How do I display it if my data exceeds this? /upload/asset/245f7442dfa3212019b47.png
The Little DreamYou can use the latest multigraph line library. This library can only draw single lines.
The Little DreamThe main function in the template is the use example, you can see it here.
The Little DreamThank you for your support! Please leave a comment if you have any questions^^