How candlestick are formed using ticks?

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In MqlTick we have bid ask and last price

so I want to know how candlesticks are formed? using bid ask or last?

If bid=0 and ask=0 an d last!=0 will it form a chart?

if bid!=0 and ask!=0 and last!=0 how it will form using which array bid,ask or last?

[Paul Anscombe]

Rodger Sen:

In MqlTick we have bid ask and last price

so I want to know how candlesticks are formed? using bid ask or last?

If bid=0 and ask=0 an d last!=0 will it form a chart?

if bid!=0 and ask!=0 and last!=0 how it will form using which array bid,ask or last?

Bid is the answer 

A candle is started by the first tick arrival after the start time for the candle.  That means it may start later than start time depending on tick frequency 

As it only starts with a tick it will not be all zeros 

[[Deleted]]

Paul Anscombe #:
Bid is the answer 

A candle is started by the first tick arrival after the start time for the candle.  That means it may start later than start time depending on tick frequency 

As it only starts with a tick it will not be all zeros 

Thanks