R のローソク足バーへの美しく高速な代替アプローチを導入してくれた FXQuantTrader に感謝します! 素晴らしい、簡潔、読みやすい!以下を含む FXQuantTrader のソリューションの少し改良されたバージョンがあります:
- 関数にラップします
- 低解像度 (1 秒バーまで) をサポートします -
ろうそくのひげの色を黒から適切な色に変更します
- Close = のバーに小さな水平線を追加します= オープン
- クローズのバーに 3 番目の色 (青) を追加します == オープン
- ローソク足チャート全体をより透明にすることができる「アルファ」引数を追加します。気が散りにくくなります(背景のようになります)
- 初心者が何が起こっているのかを理解するためのもう少しのコメント:)
ここに彼女が来ます:
library(ggplot2)
library(quantmod)
draw_candles <- function(df, title_param, alpha_param = 1){
df$change <- ifelse(df$Close > df$Open, "up", ifelse(df$Close < df$Open, "down", "flat"))
# originally the width of the bars was calculated by FXQuantTrader with use of 'periodicity()', which
# seems to work ok only with: ‘minute’,‘hourly’, ‘daily’,‘weekly’, ‘monthly’,
# ‘quarterly’, and ‘yearly’, but can not do 1 sec bars while we want arbitrary bar size support!-)
# df$width <- as.numeric(periodicity(df)[1])
# So let us instead find delta (seconds) between 1st and 2nd row and just
# use it for all other rows. We check 1st 3 rows to avoid larger "weekend gaps"
width_candidates <- c(as.numeric(difftime(df$Date[2], df$Date[1]), units = "secs"),
as.numeric(difftime(df$Date[3], df$Date[2]), units = "secs"),
as.numeric(difftime(df$Date[4], df$Date[3]), units = "secs"))
df$width_s = min(width_candidates) # one (same) candle width (in seconds) for all the bars
# define the vector of candle colours either by name or by rgb()
#candle_colors = c("down" = "red", "up" = "green", "flat" = "blue")
candle_colors = c("down" = rgb(192,0,0,alpha=255,maxColorValue=255), "up" = rgb(0,192,0,alpha=255,maxColorValue=255), "flat" = rgb(0,0,192,alpha=255,maxColorValue=255))
# Candle chart:
g <- ggplot(df, aes(x=Date))+
geom_linerange(aes(ymin=Low, ymax=High, colour = change), alpha = alpha_param) + # candle whiskerss (vertical thin lines:)
theme_bw() +
labs(title=title_param) +
geom_rect(aes(xmin = Date - width_s/2 * 0.9, xmax = Date + width_s/2 * 0.9, ymin = pmin(Open, Close), ymax = pmax(Open, Close), fill = change), alpha = alpha_param) + # cabdke body
guides(fill = FALSE, colour = FALSE) +
scale_color_manual(values = candle_colors) + # color for line
scale_fill_manual(values = candle_colors) # color for candle fill
# Handle special cases: flat bar and Open == close:
if (any(df$change == "flat")) g <- g + geom_segment(data = df[df$change == "flat",], aes(x = Date - width_s / 2 * 0.9, y = Close, yend = Close, xend = Date + width_s / 2 * 0.9, colour = change), alpha = alpha_param)
#print(g)
g
}