Candlestick charts using Plotly and Quantmod

April 24, 2016
By

(This article was first published on R – Modern Data, and kindly contributed to R-bloggers)

This post is dedicated to creating candlestick charts using Plotly’s R-API.

For more information on candlestick charts visit www.stockcharts.com.

We’ll also showcase Plotly’s awesome new range selector feature !

plotlyCandleStick <- function(symbol = "MSFT",
                              fillcolor = "#ff6666",
                              hollowcolor = "#39ac73",
                              linewidth = 4,
                              plotcolor = "#3E3E3E",
                              papercolor = "#1E2022",
                              fontcolor = "#B3A78C",
                              startdate = "2015-01-01"){
  
  # Get OHLC prices using quantmod
  prices <- getSymbols(symbol, auto.assign = F)
  prices <- prices[index(prices) >= startdate]
  
  # Convert to dataframe
  prices <- data.frame(time = index(prices),
                       open = as.numeric(prices[,1]),
                       high = as.numeric(prices[,2]),
                       low = as.numeric(prices[,3]),
                       close = as.numeric(prices[,4]),
                       volume = as.numeric(prices[,5]))
  
  # Create line segments for high and low prices
  plot.base <- data.frame()
  plot.hollow <- data.frame()
  plot.filled <- data.frame()
  
  for(i in 1:nrow(prices)){
    x <- prices[i, ]
    
    # For high / low
    mat <- rbind(c(x[1], x[3]), 
                 c(x[1], x[4]),
                 c(NA, NA))
    
    plot.base <- rbind(plot.base, mat)
    
    # For open / close
    if(x[2] > x[5]){
      mat <- rbind(c(x[1], x[2]), 
                   c(x[1], x[5]),
                   c(NA, NA))
      
      plot.filled <- rbind(plot.filled, mat)
    }else{
      mat <- rbind(c(x[1], x[2]), 
                   c(x[1], x[5]),
                   c(NA, NA))
      
      plot.hollow <- rbind(plot.hollow, mat)
    }
  }  
  
  colnames(plot.base) <- colnames(plot.hollow) <- colnames(plot.filled) <- c("x", "y")
  plot.base$x <- as.Date(as.numeric(plot.base$x))
  plot.hollow$x <- as.Date(as.numeric(plot.hollow$x))
  plot.filled$x <- as.Date(as.numeric(plot.filled$x))
  
  hovertxt <- paste("Date: ", round(prices$time,2), "
", "High: ", round(prices$high,2),"
", "Low: ", round(prices$low,2),"
", "Open: ", round(prices$open,2),"
", "Close: ", round(prices$close,2)) # Base plot for High / Low prices p <- plot_ly(plot.base, x = x, y = y, mode = "lines", marker = list(color = '#9b9797'), line = list(width = 1), showlegend = F, hoverinfo = "none") # Trace for when open price > close price p <- add_trace(p, data = plot.filled, x = x, y = y, mode = "lines", marker = list(color = fillcolor), line = list(width = linewidth), showlegend = F, hoverinfo = "none") # Trace for when open price < close price p <- add_trace(p, data = plot.hollow, x = x, y = y, mode = "lines", marker = list(color = hollowcolor), line = list(width = linewidth), showlegend = F, hoverinfo = "none") # Trace for volume p <- add_trace(p, data = prices, x = time, y = volume/1e6, type = "bar", marker = list(color = "#ff9933"), showlegend = F, hoverinfo = "x+y", yaxis = "y2") # Trace for hover info p <- add_trace(p, data = prices, x = time, y = high, opacity = 0, hoverinfo = "text", text = hovertxt, showlegend = F) # Layout options p <- layout(p, xaxis = list(title = "", showgrid = F, tickformat = "%b-%Y", tickfont = list(color = fontcolor), rangeselector = list( x = 0.85, y = 0.97, bgcolor = "fontcolor", buttons = list( list( count = 3, label = "3 mo", step = "month", stepmode = "backward"), list( count = 6, label = "6 mo", step = "month", stepmode = "backward"), list( count = 1, label = "1 yr", step = "year", stepmode = "backward"), list( count = 1, label = "YTD", step = "year", stepmode = "todate"), list(step = "all")))), yaxis = list(title = "Price", gridcolor = "#8c8c8c", tickfont = list(color = fontcolor), titlefont = list(color = fontcolor), domain = c(0.30, 0.95)), yaxis2 = list(gridcolor = "#8c8c8c", tickfont = list(color = fontcolor), titlefont = list(color = fontcolor), side = "right", domain = c(0, 0.2)), paper_bgcolor = papercolor, plot_bgcolor = plotcolor, margin = list(r = 50, t = 50), annotations = list( list(x = 0.02, y = 0.25, text = "Volume(mil)", ax = 0, ay = 0, align = "left", xref = "paper", yref = "paper", xanchor = "left", yanchor = "top", font = list(size = 20, color = fontcolor)), list(x = 0, y = 1, text = symbol, ax = 0, ay = 0, align = "left", xref = "paper", yref = "paper", xanchor = "left", yanchor = "top", font = list(size = 20, color = fontcolor)), list(x = 0.1, y = 1, text = paste("Start: ", format(min(prices$time), "%b-%Y"), "
End: ", format(max(prices$time), "%b-%Y")), ax = 0, ay = 0, align = "left", xref = "paper", yref = "paper", xanchor = "left", yanchor = "top", font = list(size = 10, color = fontcolor)) )) return(p) }
library(plotly)
library(quantmod)

plotlyCandleStick("TSLA")

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