Help me to plot candlesticks

Hey, gonna assume this is a repost of 

Please check the documentation on Charting and start there. Should be relatively self-explanatory but do let us know if you run into any issues!

Hey Douglas,

Thanks for replying. I did read the documentation. But it doesnt answer my questions. First, why is there skipping going on.? Candles are only plotted for every other hour, as opposed to every hour. Second, how do you attach low, high, open, close price data to the same candlestick? If I create a separate series for each of these, then four candle sticks will lay on top of each other, instead of one candlestick for all four. 

I'm attaching an example of as far as I understand candlestick plotting in QC. I don't know how to add OHLC to the candle - as far as I know, the chart will generate this itself based on the data you feed it. So if you feed all of the values into the same series (and make sure you feed your open first and your close last), you should get a bar that represents this accurately.

I'm sorry I can't help you fully - I haven't played enough with the charting to fully be able to help you.

To view the candles, try cloning the algo and backtesting it on your end. (I can't get the candles to show on the forum).

This may also help:

Thanks for your help Douglas. I cloned your example and ran it, there was no OHLC data printed on the bar. Only date and "Series1" were printed on the bar, Also, the examples were not written in Python, and the data in the example was not Forex. You know, Quotebars behave differently than Tradebars.

My example was meant to highlight a point - candles in Lean do not themselves contain OHLC values that you can set yourself, but rather the candles are simply visually generated based on the amount of data and time you've zoomed into. This is as far as I understand the candle concept - if you study the source code for how the candles are generated I think you will come to the same conclusion.

Please also take a look at the link I gave you - it illustrates how you can approximate a candle as best as possible, and it again highlights that the candles are visually generated based on the underlying point-by-point data rather than by 4 different series (OHLC).

Hey Douglas, the link that you sent was not very helpful because it wasnt Python code, which is the language that I work with... It is interesting, there are so many comments in the community that contain charts with candlesticks that show all four OHLC values. Yet, nobody seems to know anything about the issure. It is very weird. 

Hey All,

so I figured out how to plot candles in Python and wanted to share.

class QuantumVerticalProcessor(QCAlgorithm):

chart = None
series = None

def Initialize(self):
self.SetStartDate(2019, 11, 8) # Set Start Date
self.SetCash(100000) # Set Strategy Cash
self.AddEquity("SPY", Resolution.Daily)

self.candles = Series('Daily', SeriesType.Candle)
self.chart = Chart('Candles')
self.chart.AddSeries(self.candles)
self.AddChart(self.chart)


def OnData(self, data):
time = self.UtcTime
# NOTE: order is important and each point has to be one minute apart because reasons.
self.candles.AddPoint(time + timedelta(minutes=1), data["SPY"].Open)
self.candles.AddPoint(time + timedelta(minutes=2), data["SPY"].High)
self.candles.AddPoint(time + timedelta(minutes=3), data["SPY"].Low)
self.candles.AddPoint(time + timedelta(minutes=4), data["SPY"].Close)

You're welcome!

Adding to James' solution, if you're operating within a given resolution, you can at least set the open and close times correctly for the candle. The high/low times can be any time in between the open/start and close/end time. See below for an example plotting hourly candles using an Hourly data resolution. 

Hi all,

I am having an issue plotting the candle stick chart correctly on consolidated data. Following the above example, I can plot a EURUSD candle chart perfectly on Daily data, but if I switch the base resolution to hourly and then plot on top of a daily consolidator, the candles plot incorrectly.

There may be a clue in the log of time which I have printed which looks inconsistent between the two examples.

Can anyone please help me plot the candles out correctly using Daily Consolidated data, keeping the raw input to hourly (so I can fill trades better)? Example attached, Thank you.

@Charles Naccio, have you managed to plot n-minutes candlestick chart on consolidated data in OnConsolidated event handler? I tried and I receive only daily candles... and think that the only workaround for custom bars is to use point data and scatter plot.

Hi Marek,

The code provided by Charles should work similarly inside a consolidated data function as this function receives a TradeBar object.

Best,
Shile Wen