问题
Candlestick plots on the financial sites, at least the ones I have seen, fill the candlestick green if the close is higher then the open, and red if the close is lower then the open.
If I set the fill style all candlesticks are filled with the fill color, is there a way in gnuplot 4.6 to use the color scheme as I described above?
A sample script is:
set xdata time
set timefmt"%Y-%m-%d %H:%M:%S"
set xrange ["2014-01-01":"2014-01-02"]
set yrange [*:*]
set datafile separator ","
plot '201401_EURUSD_Hourly.csv' using 1:2:4:3:5 notitle with candlesticks
with some data points
2014-01-01 17:00:00,1.376150,1.376550,1.374020,1.375990
2014-01-01 18:00:00,1.376100,1.377340,1.375980,1.376520
2014-01-01 19:00:00,1.376440,1.376870,1.375780,1.375860
2014-01-01 20:00:00,1.375850,1.376470,1.375000,1.376280
2014-01-01 21:00:00,1.376270,1.376720,1.375970,1.376530
2014-01-01 22:00:00,1.376550,1.377440,1.376270,1.376530
2014-01-01 23:00:00,1.376540,1.376540,1.374390,1.374520
2014-01-02 00:00:00,1.374500,1.375790,1.374380,1.375660
2014-01-02 01:00:00,1.375630,1.375740,1.374610,1.375000
2014-01-02 02:00:00,1.374980,1.375270,1.372480,1.373100
回答1:
Here is an example which uses a predefined color palette to select the colors (keyword palette):
set xdata time
set timefmt"%Y-%m-%d %H:%M:%S"
set datafile separator ","
set palette defined (-1 'red', 1 'green')
set cbrange [-1:1]
unset colorbox
set style fill solid noborder
plot '201404_EURUSD_Hourly.csv' using 1:2:4:3:5:($5 < $2 ? -1 : 1) notitle with candlesticks palette
That uses an additional column (the last one) to select between values -1 (red, close lower than open) and +1 (green, close higher than open).
The output with 4.6.4 is:
The second option is to use linecolor rgb variable, in which case the last column must be in integer representation of an rgb-tuple:
set xdata time
set timefmt"%Y-%m-%d %H:%M:%S"
set datafile separator ","
set style fill solid noborder
# Place colored points in 3D at the x,y,z coordinates corresponding to
# their red, green, and blue components
rgb(r,g,b) = 65536 * int(r) + 256 * int(g) + int(b)
plot '201404_EURUSD_Hourly.csv' using 1:2:4:3:5:($5 < $2 ? rgb(255,0,0) : rgb(0,255,0)) linecolor rgb variable notitle with candlesticks
And, last but not least, use linecolor variable to select between two linetypes (the last column is the linetype index):
set xdata time
set timefmt"%Y-%m-%d %H:%M:%S"
set datafile separator ","
set style fill solid noborder
set linetype 1 lc rgb 'red'
set linetype 2 lc rgb 'green'
plot '201404_EURUSD_Hourly.csv' using 1:2:4:3:5:($5 < $2 ? 1 : 2) linecolor variable notitle with candlesticks
来源：https://stackoverflow.com/questions/23270807/gnuplot-candlestick-red-and-green-fill